JP3746042B2 - Induction heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating apparatus.
[0002]
[Prior art]
An induction heating device that uses induction heating and uses an inverter is equipped with a temperature detection element in the vicinity of the load pan, etc., detects the pan temperature, etc., and adjusts the heating power and cooking time accordingly. By performing, it has excellent heat response and controllability. The induction heating device realizes fine cooking and has the characteristics of not polluting indoor air because it does not use a flame, high thermal efficiency, safety and cleanliness. In recent years, these characteristics have attracted attention, and the demand for induction heating devices has increased rapidly.
When an object to be heated is cooked via a nonmagnetic, low-resistivity metal load (for example, an aluminum pan or pan) in an induction heating device, the magnetic field of the heating coil against the eddy current induced by the load Due to the above action, a large buoyancy acts on the load and / or the load is light, and therefore the load may move during cooking (including lateral displacement and floating).
[0003]
Japanese Patent Application Laid-Open No. 2001-332375 discloses that at the start of heating, the heating output is gradually increased from a state where the heating output is small to the set output, and the change in the slope of the change in the power supply current is detected to detect the floating or movement of the load. In the case of recognizing and recognizing, the induction heating cooker of Conventional Example 1 that performs control (no specific method is described) such as heating stop and input power reduction is disclosed.
[0004]
The induction heating cooker of the prior art example 2 which is an induction heating apparatus is demonstrated using FIGS. FIG. 25 is a schematic configuration diagram of the induction heating apparatus of Conventional Example 2. FIG. 26 is a block diagram of the induction heating apparatus of Conventional Example 2. 25 and 26, 110 is an object to be heated (a metal container such as a pan or a frying pan), 101 is an induction heating coil that generates a high-frequency magnetic field and heats the object to be heated 110, 109 is a commercial AC power input, and 108 is A rectifying / smoothing unit composed of a bridge and a smoothing capacitor for rectifying commercial AC power, 102 is an inverter circuit for converting the power rectified by the rectifying / smoothing unit 108 into high-frequency power and supplying high-frequency current to the induction heating coil 101, and 103 is an inverter An output detection unit (specifically, a current transformer that detects the power supply current of the inverter circuit 102) that detects the output level of the circuit 102, a microcomputer 5612, and a plurality of key switches (target output of the induction heating device) Including a key switch for inputting an output stage setting command to determine 601 is a top plate of the ceramic placing the object to be heated 110 is placed on top of the housing. The microcomputer 5612 includes a control unit 5704 and a movement detection unit 5706.
[0005]
The movement detection unit 5706 detects the movement (including displacement and floating) of the object to be heated 110 by the same method as in Conventional Example 1.
The control unit 5704 controls the output of the inverter circuit 102 according to the output signal of the output detection unit 103 and the output signal of the movement detection unit 5706. The variation of the heating output is performed by controlling the driving frequency of the switching element.
When the movement detection unit 5706 does not detect the movement of the object to be heated 110, the control unit 5704 controls the output (detection current) of the output detection unit 103 to be the set target current value. When the movement detection unit 5706 detects the movement of the object to be heated 110, the control unit 5704 stops the movement of the object to be heated 110, and the control unit 5704 causes the output power of the inverter circuit 102 to be a predetermined low level that does not cause a shift or a float. Control to decrease rapidly to the value. Alternatively, the control unit 5704 may stop the inverter circuit 102. Thereby, the lift and movement of the load can be reduced, and the safety of the induction heating device can be ensured.
[0006]
FIG. 27 shows an example of the relationship between input power and buoyancy when a pan, which is an object to be heated, made of a nonmagnetic metal (for example, aluminum) is heated. In FIG. 27, the horizontal axis indicates the input power to the inverter circuit 102, and the vertical axis indicates the buoyancy acting on the object 110 to be heated. As shown in FIG. 27, the buoyancy increases as the input power increases. When this buoyancy exceeds the weight of the object to be heated, deviation and / or floating of the object to be heated occurs.
[0007]
The broken line in FIG. 28 indicates that after the inverter circuit 102 is started (heating is started), the heating output is gradually increased from a state in which the heating output is reduced to the set output (target value), and the output of the inverter circuit 102 becomes the set power. The state of change in the input current of the inverter circuit 102 until it reaches is shown. The solid line in FIG. 28 indicates that after the inverter circuit 102 is started (heating is started), the heating output is gradually increased from a state where the heating output is small to the set output (target value), and the output of the inverter circuit 102 is set power (target value). The state of change in the input current of the inverter circuit 102 when the movement detection unit 5706 detects the displacement or floating of the object to be heated 110 before reaching () is shown. In FIG. 28, the horizontal axis represents time, and the vertical axis represents the input power supply current of the inverter circuit 102. In the induction heating apparatus of Conventional Example 2 shown in FIG. 28, when the movement detection unit 5706 detects the movement (shift or float) of the object to be heated 110, the operation after the inverter circuit 102 is started is executed from the beginning. That is, the heating output is gradually increased until the output of the inverter circuit 102 becomes a set output from a small output value at the time of starting (a small output value at the start of heating) or until the movement detection unit 5706 detects the movement of the object to be heated 110 again. Increase. This operation is repeated.
[0008]
The detection operation of the movement detection unit 5706 of the conventional example 2 will be described with reference to FIG. In the induction heating device of Conventional Example 2, after the inverter circuit 102 is started (heating is started), the heating output is gradually increased from the state where the heating output is small to the set output (target value), and the output of the inverter circuit 102 is set to the set power. To. FIG. 29A shows a change in input power over time when the heated object 110 is displaced or floated before the output of the inverter circuit 102 reaches the set power. In FIG. 29A, the horizontal axis represents time, and the vertical axis represents input power of the induction heating coil 101. FIG. 29B shows a time change of the power supply current (input current of the inverter circuit 102) in that case. In FIG. 29B, the horizontal axis represents time, and the vertical axis represents the input power supply current of the inverter circuit 102.
[0009]
In FIG. 29, when the heating output is gradually increased at the start of heating, buoyancy acts on the object to be heated 110, and the object to be heated 110 moves (lifts or floats and moves sideways). The object 110 moves away from the induction heating coil 101. The input power of the induction heating coil 101 is reduced by the distance. When the object to be heated 110 moves, as shown in FIG. 29, the inclination of the change in the power source current (and the input power of the induction heating coil 101) decreases. The movement detection unit 5706 detects the movement of the object to be heated 110 based on a change in the slope (time differential value) of the power supply current detected by the output detection unit 103.
[0010]
[Patent Document 1]
JP 2001-332375 A
[0011]
[Problems to be solved by the invention]
When cooking using the induction heating cooker of Conventional Example 2, if the user manually moves the food, the movement detection unit erroneously determines that the object to be heated has moved due to buoyancy, and the control unit May decrease the heating output or stop the heating (in the conventional example 2, the operation shown in FIG. 28 was performed. In another conventional example, when the object to be heated was detected, the inverter was turned on. The inverter output was suppressed to a predetermined low output (a low output that does not move in any pan). In such a case, there was a problem that cooking could not be performed substantially due to insufficient thermal power. Although the induction heating cooker of Conventional Example 2 operates safely, there is a possibility that cooking cannot be performed substantially when the safety function is activated.
[0012]
The present invention is intended to solve the above-mentioned conventional problems, and has a safety function for reducing or stopping the thermal power when the object to be heated moves, and the safety function hinders the user's cooking work. Provided is an induction heating device that is difficult to generate.
The present invention has a safety function to reduce or stop the heating power when the heated object moves, and the induction heating coil maintains a high heating power even when the safety function works, and the user performs cooking. Provided is an induction heating apparatus that enables the above.
[0013]
The present invention has a safety function to reduce or stop the heating power when the heated object moves, and the safety function does not work when the user artificially moves the pan that is the heated object, or the safety function An induction heating apparatus that can stop cooking (for example, cooking of fried foods, etc.) is provided.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, an induction heating apparatus of the present invention sets an induction heating coil that generates a high-frequency magnetic field and heats an object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, and heating settings. An input unit, a movement detection unit that detects movement of the object to be heated, and an output of the inverter circuit are controlled, and when the movement detection unit detects movement of the object to be heated, the output of the inverter circuit is stopped. Or a control unit that performs a suppression operation to suppress, and the input unit When the cooking menu selected for cooking, the thermal power, or the time-series combination of the thermal power set in advance when performing automatic cooking is a setting in which the heated object is frequently moved artificially Or when the setting is likely to be misjudged by the movement detection unit The detection sensitivity of the movement detection unit is dulled or the detection is stopped, or the suppression operation of the control unit is not weakened or performed.
ADVANTAGE OF THE INVENTION This invention can implement | achieve the induction heating apparatus which has a safety function which reduces or stops a thermal power when a to-be-heated material moves, and prevents that a user cannot perform cooking by a safety function working. The present invention realizes an easy-to-use and safe induction heating apparatus.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An induction heating apparatus according to one aspect of the present invention includes an induction heating coil that generates a high-frequency magnetic field and heats an object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, and an input unit that performs heating settings. The movement detection unit that detects the movement of the object to be heated and the output of the inverter circuit are controlled, and the output of the inverter circuit is stopped or suppressed when the movement detection unit detects the movement of the object to be heated. A control unit for performing a suppression operation, and the input unit When the cooking menu selected for cooking, the thermal power, or the time-series combination of the thermal power set in advance when performing automatic cooking is a setting in which the heated object is frequently moved artificially Or when the setting is likely to be misjudged by the movement detection unit The detection sensitivity of the movement detection unit is dulled or the detection is stopped, or the suppression operation of the control unit is not weakened or performed.
[0016]
An induction heating cooker according to another aspect of the present invention includes an inverter including a heating coil that induction-heats a load made of a nonmagnetic and low-resistivity metal, an input unit for setting, and a setting for the input unit. A heating output control means for controlling the heating output of the heating coil, and a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil. Load movement detecting means having When the cooking menu selected for cooking, the thermal power, or the time-series combination of the thermal power set in advance when performing automatic cooking is a setting in which the heated object is frequently moved artificially Or when the load movement detection means is a setting that is likely to be erroneously determined, The function of the load movement detecting means is suppressed or invalidated.
[0017]
In the present invention, for example, there is a high possibility that the object to be heated (load) is frequently set to be moved or the movement detection unit (or load movement detection means) of the object to be heated makes an erroneous determination. When the setting is made, the function of the movement detection unit (or load movement detection means) of the object to be heated is automatically suppressed or invalidated. The present invention has a safety function with respect to load transfer, and does not cause a decrease or stop of the heating power when cooking where there is a lot of opportunity to artificially move the load, such as cooking fried food. An easy-to-use induction heating device or induction heating cooker that can be appropriately cooked by the user is realized.
[0018]
Or in this invention, the function of the movement detection part (or load movement detection means) of a to-be-heated object can be suppressed or invalidated by making a specific setting as needed, for example. This eliminates or alleviates the inconvenience of disturbing cooking when the safety function based on the movement detection of the object to be heated is inappropriate. An easy-to-use induction heating device or induction heating cooker can be realized.
[0019]
When induction heating is performed using a nonmagnetic and low resistivity load such as an aluminum pan, frying pan, or heating plate, the load is light and the load is reduced by the repulsive magnetic field when induction is used. The buoyancy acts on the load, and the load is lifted or floated and moved sideways. If such a phenomenon occurs during cooking, the load is removed from the center of the heating source, so that the heating efficiency may be reduced, or it may move and hit another object and damage it. In order to prevent this, a load movement detection unit (or load movement detection means) is provided for such a load, and when floating is detected, the output of the induction heating heat source is controlled to stop or decrease floating.
However, the required heating output varies depending on the cooking menu (for example, fried food cooking and stewed cooking). The frequency and amount of movement of the load (pot) when the user cooks is different.
[0020]
On the other hand, the load detection unit (or load movement) indicates that the load naturally floated and that the user standing in front of the induction heating device (or induction heating cooker) moved the load artificially. The detection means) can be identified to some extent automatically, but there is a limit. There is a possibility that the load movement detection unit (or load movement detection means) may make a false detection. Therefore, according to the present invention, when the user sets a high output stage or sets a cooking menu (for example, fried food cooking) that involves artificial load movement, the load movement detection unit (or load movement detection means) The heating source outputs the thermal power necessary for cooking regardless of the movement of the load.
[0021]
For example, the case where it cooks using a household 2KW induction heating cooking appliance is demonstrated. The cooking menu is fried rice using a frying pan. It is suitable that the fried rice is heated in the vicinity of 1500 W in the cooker. Therefore, the heating output is set to 1500W.
Alternatively, when there is a key corresponding to fried rice such as “stir-fried food”, when the key is operated, 1500 W is set. Of course, when there is no heating output corresponding to 1500 W, the heating output corresponding to the vicinity thereof may be used. When cooking progresses and the frying pan is moved to go upside down, load movement detection is activated and the heating output is reduced to 500 W, for example. Fried rice cannot be finished with a heating output of 500 W. However, in the present invention, when the output of 1500 W or “stir-fried food” is set, the function of load movement detection is disabled. Thereby, even if a user cooks moving a frying pan, the 1500 W of thermal power is ensured and fried rice can be finished well. Or, when the output of 1500 W or “stir-fried food” is set, the degree of suppression of the heating output based on the load movement detection is reduced as compared with normal (other settings). For example, when load movement is detected, the load is reduced from 1500 W to 1300 W. Even after detecting the movement of load, ensure the heating power required for fried rice.
[0022]
It may be difficult to detect the load movement, for example, the movement of the load is not detected unless the movement of the frying pan is very large, and the heating power substantially necessary for fried rice may be secured.
What is set in the operation unit (input unit) in the present invention is a cooking menu selected for cooking (stir-fried food, stewed or boiling water, etc.), or selected (set) heating power or automatic cooking for cooking. Including a time-series combination of preset thermal powers when performing.
[0023]
In the induction heating apparatus according to another aspect of the present invention, the input unit includes a heating output setting unit that sets a heating output, and the heating output set by the heating output setting unit When the size of the setting is a setting in which the object to be heated is often moved artificially or the setting is likely to be erroneously determined by the movement detection unit. The detection sensitivity of the movement detection unit is dulled or the detection is stopped, or the suppression operation of the control unit is not weakened or performed.
In the induction heating cooker according to another aspect of the present invention, the input unit includes heating output setting means for setting the heating output, and the set value in the heating output setting means When the size of the object is a setting in which the object to be heated is frequently moved or when the load movement detection means is likely to be erroneously determined. Suppress or disable the function of the load movement detection means.
Depending on the size of the heating output, the possibility that the movement detection unit (or load movement detection means) of the object to be heated will be erroneously determined changes or the number of opportunities to move the load artificially varies. There is a case. With the above configuration, it is possible to eliminate or alleviate the disadvantage of working when the safety function based on movement detection of the object to be heated is inappropriate and disturbing cooking. An easy-to-use induction heating device or induction heating cooker can be realized.
[0024]
According to another aspect of the invention Invitation The induction heating device An induction heating coil that generates a high-frequency magnetic field and heats the object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, an input unit that sets heating, and a movement detection that detects the movement of the object to be heated And a control unit that controls the output of the inverter circuit, and performs a suppression operation to stop or suppress the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated. The input unit includes a heating output setting unit for setting a heating output, When the set value of the heating output in the heating output setting unit becomes a predetermined value or more, the detection sensitivity of the movement detection unit is dulled or stopped, or the suppression operation of the control unit is not weakened or performed.
According to another aspect of the invention Invitation Induction heating cooker An inverter having a heating coil for induction heating a load made of a nonmagnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit And a load movement detection means having a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil. The unit comprises heating output setting means for setting the heating output, When the set value of the heating output in the heating output setting means becomes a predetermined value or more, the function of the load movement detecting means is suppressed or invalidated.
With this configuration, when cooking with low thermal power like boiled food cooking, when the heated object moves, it operates a safety function that lowers the thermal power, for example, it is heated artificially with high thermal power like fried food cooking When cooking while moving an object, the safety function based on the movement of the object to be heated is relaxed or disabled, and it is always possible to cook with high output.
[0025]
In the induction heating device according to another aspect of the present invention, when the movement detection unit detects the movement of a load, the input unit so Setting If the cooking mode is set to give priority to firepower Continue heating output However, if the setting focuses on safety against buoyancy, the heating output Stop In Switch.
In the induction heating cooker according to another aspect of the present invention, the load movement detection means is an input unit. so Setting If the cooking mode is set to give priority to firepower Continue heating output after detecting lift or movement of load If the setting focuses on safety against buoyancy, the heating output Stop In It is set as the structure switched.
With this configuration, according to the setting contents of the input unit, for example, cooking that needs to be cooked with high heating power is maintained with priority on heating power, and when cooking with low heating power, cooking can be performed with emphasis on safety. An induction heating device or induction heating cooker with good usability can be realized.
[0026]
According to another aspect of the invention Invitation The induction heating device An induction heating coil that generates a high-frequency magnetic field and heats the object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, an input unit that sets heating, and a movement detection that detects the movement of the object to be heated And a control unit that controls the output of the inverter circuit, and performs a suppression operation to stop or suppress the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated. The input unit includes a heating output setting unit for setting a heating output, When the setting unit included in the input unit other than the heating output setting unit is used, the detection sensitivity of the movement detection unit is dulled or stopped, or the suppression operation of the control unit is not weakened or performed.
According to another aspect of the invention Invitation Induction heating cooker An inverter having a heating coil for induction heating a load made of a nonmagnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit And a load movement detection means having a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil. The unit comprises heating output setting means for setting the heating output, The setting means provided in the input unit other than the heating output setting means is used to suppress or invalidate the function of the load movement detection means.
A setting unit (or setting unit) other than the heating output setting unit (or heating output setting unit) (setting input unit related to an item not related to heating output) suppresses a safety function based on movement detection of an object to be heated (load) or Perform the invalidation operation. The operation for suppressing or invalidating the safety function based on the movement detection of the object to be heated (load) is easy for the user to understand. The user can arbitrarily perform the operation as necessary.
[0027]
According to another aspect of the invention Invitation The induction heating device An induction heating coil that generates a high-frequency magnetic field and heats the object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, an input unit that sets heating, and a movement detection that detects the movement of the object to be heated And a control unit that controls the output of the inverter circuit, and performs a suppression operation to stop or suppress the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated. If a change input unit provided independently of the input unit is used, the detection sensitivity of the movement detection unit is dulled or stopped, or the suppression operation of the control unit is not weakened or performed.
The induction heating cooker according to another aspect of the present invention is as follows. An inverter having a heating coil for induction heating a load made of a nonmagnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit Means, and load movement detection means having a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil, The function of the load movement detection means can be suppressed or invalidated by using a change input unit provided independently in the input unit.
Since the change input unit is independent, the operation for suppressing or invalidating the safety function based on the movement detection of the object to be heated (load) is easy to understand, which is easy to use.
[0028]
In the induction heating apparatus according to another aspect of the present invention, the change input unit includes a fried food cooking selection unit for performing fried food cooking, and when the fried food cooking is selected, the detection sensitivity of the movement detection unit is increased. Dulling or stopping detection, or weakening or not performing the suppression action of the control unit.
In the induction heating cooker according to another aspect of the present invention, the change input unit has a stir-fried food selection means for performing fried food cooking, and if the fried food cooking is selected, the function of the load movement detecting means is suppressed or Disable it.
Generally speaking, the frequency with which the user cooks the fried food is high, and the user cooks the object to be heated while moving the fried food. In the fried food cooking, by suppressing or invalidating the safety function based on the movement detection of the object to be heated, it is possible to realize an induction heating device or an induction heating cooker that is easy to use.
[0029]
An induction heating apparatus according to another aspect of the present invention includes an induction heating coil that generates a high-frequency magnetic field and heats an object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, and a magnitude of an output of the inverter circuit An output detection unit for detecting movement, a movement detection unit for detecting movement of the object to be heated, and an output of the output detection unit To become the set power or current Control the output of the inverter circuit At the same time, when the movement detection unit detects the movement of the object to be heated, the operation of stopping or suppressing the output of the inverter circuit is performed. A control unit; To increase the average power for induction heating of the non-magnetic, low resistivity metal object to be heated A movement detection stop input unit that inputs a stop command to stop the detection operation of the movement detection unit or the control unit from controlling the output according to the output of the movement detection unit.
[0030]
An induction heating apparatus according to another aspect of the present invention includes an induction heating coil that generates a high-frequency magnetic field and heats an object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, and a magnitude of an output of the inverter circuit Output detection means for detecting the movement, movement detection means for detecting the deviation or floating of the heated object, and the output of the output detection means To become the set power or current Control the output of the inverter circuit At the same time, when the movement detecting means detects the movement of the object to be heated, a suppression operation for stopping or suppressing the output of the inverter circuit is performed. A movement detection stop input unit configured by a control unit and a key switch for stopping the movement detection unit is provided.
[0031]
When a user cooks while moving an object to be heated such as a frying pan, a shift or lift of the object to be cooked is not detected. Thereby, compared with the case where the safety function based on the movement of a to-be-heated material worked, the average electric power applied to an induction heating coil rises. The present invention realizes an easy-to-use and safe induction heating apparatus that can cook properly in a short time when a user cooks a heated object such as a frying pan. When a user cooks while moving a lightweight frying pan made of a nonmagnetic material such as aluminum, the safety function based on the movement of the object to be heated can be stopped. Thereby, it can cook, moving a frying pan, without reducing a thermal power.
[0032]
According to another aspect of the invention Invitation The induction heating device An induction heating coil that generates a high-frequency magnetic field to heat the object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, an output detection unit that detects the magnitude of the output of the inverter circuit, and the object to be heated The movement detection unit that detects the movement of the output circuit, and the output of the output detection unit controls the output of the inverter circuit so as to be set power or current, and the movement detection unit detects the movement of the object to be heated. A control unit that performs a suppression operation to stop or suppress the output of the inverter circuit, and a detection operation of the movement detection unit or the control unit to stop controlling the output according to the output of the movement detection unit A movement detection stop input unit for inputting a stop command; A first timer unit that starts timing in relation to an input operation to the movement detection stop input unit, and until the predetermined time elapses after the first timer unit starts timing, Regardless of whether the object to be heated has moved or not The output of the inverter circuit becomes the set power or current Take control.
The induction heating apparatus according to another aspect of the present invention includes first timer means for starting timing by the movement detection stop input means, and the movement detection means starts operation after a predetermined time has elapsed.
[0033]
Only when the user consciously performs an input operation to the movement detection stop input unit (or movement detection stop input means) (for example, when a key switch is pressed), that is, the user is in front of the induction heating device. Only when the safety function based on the movement of the object to be heated is stopped. After the predetermined time has elapsed, the safety function based on the movement of the object to be heated is automatically activated again. Therefore, when there is no user, the safety function is activated again. Since it is not necessary for the user to perform the operation to re-enable the safety function, the user forgets to restore the setting (to re-enable the safety function), and the object to be heated is induction heated. Troubles of moving by the magnetic field of the coil (for example, stew spills out) are unlikely to occur. A safe and easy-to-use induction heating device that can stop the safety function as needed is realized.
For example, the first timer unit (or the first timer means) starts timing when an input operation is performed or when a predetermined process is performed after the input operation and the process is completed.
[0034]
An induction heating apparatus according to another aspect of the present invention includes an induction heating coil that generates a high-frequency magnetic field and heats an object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, and a magnitude of an output of the inverter circuit An output detection unit for detecting movement, a movement detection unit for detecting movement of the object to be heated, and an output of the output detection unit To become the set power or current Control the output of the inverter circuit At the same time, when the movement detection unit detects the movement of the object to be heated, the operation of stopping or suppressing the output of the inverter circuit is performed. A control unit and an output fixing input unit for inputting an output fixing command. When the output fixing command is input, the control unit outputs the output of the inverter circuit regardless of whether or not the object to be heated has moved. To fix.
[0035]
An induction heating apparatus according to another aspect of the present invention includes an induction heating coil that generates a high-frequency magnetic field and heats an object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, and a magnitude of an output of the inverter circuit Output detecting means for detecting the movement, movement detecting means for detecting deviation or floating of the heated object, and output of the output detecting means To become the set power or current Control the output of the inverter circuit At the same time, when the movement detecting means detects the movement of the object to be heated, a suppression operation for stopping or suppressing the output of the inverter circuit is performed. A control value controlled by the control means in accordance with a detection result of the control means and the movement detection means; As long as the heated object does not move Output fixing input means for fixing is provided.
[0036]
When a user cooks a lightweight heated object such as a frying pan, the user cooks with a fixed output without disturbing the cooking operation due to inappropriate safety functions based on the movement of the heated object. be able to. When the object to be heated is heated with the output fixed, the average power applied to the induction heating coil is increased as compared with the case where the safety function based on the movement of the object to be heated is activated. The present invention realizes an easy-to-use and safe induction heating apparatus that can cook properly in a short time when the user cooks while moving the object to be heated.
[0037]
The induction heating apparatus according to another aspect of the present invention includes a second timer unit that starts timing in response to an input of the output fixing command to the output fixing input unit, and is measured by the second timer unit. When the given time exceeds a predetermined time, the control unit releases the fixing of the output of the inverter circuit.
The induction heating apparatus according to another aspect of the present invention includes second timer means for starting timing by the output fixing input means, and the control means releases the output fixing after a predetermined time has elapsed.
Only when the user consciously performs an input operation to the fixed output input section (for example, when a key switch is pressed), that is, only when the user is in front of the induction heating device, the object to be heated is moved. Stops the safety function based on it and outputs a fixed output. After a predetermined time has elapsed, the safety function based on the movement of the object to be heated is automatically activated again, so that the safety is high. A safe and easy-to-use induction heating device that can stop the safety function as needed is realized.
[0038]
In the induction heating apparatus according to another aspect of the present invention, the control unit fixes the output of the inverter circuit only while the output fixing input unit is inputting an output fixing command. In the induction heating apparatus according to another aspect of the present invention, the control unit fixes the output only while the key switch constituting the output fixing input unit is being pressed.
When the user stops the input operation to the fixed output input section (or fixed output input means) (for example, when the user stops pressing the key switch) (this is when the user leaves the front of the induction heating device) Since the safety function based on the movement of the object to be heated is stopped, the induction heating apparatus having the above configuration is highly safe.
[0039]
The induction heating apparatus according to another aspect of the present invention includes a fixed output setting unit that adjusts an output of an inverter circuit fixed by the output fixed input unit.
The induction heating apparatus according to another aspect of the present invention includes fixed output setting means for adjusting the output of the inverter fixed by the output fixing means.
The user can adjust the thermal power when outputting a fixed output. Realize an easy-to-use and safe induction heating device.
[0040]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0041]
Example 1
The induction heating apparatus (induction heating cooker) of Example 1 of this invention is demonstrated using FIGS. The induction heating apparatus of the present embodiment can heat a nonmagnetic metal container such as aluminum or copper. FIG. 1 is a block diagram of the induction heating apparatus according to the first embodiment. FIG. 2 is a circuit diagram specifically showing the main part. 1 and 2 of the first embodiment, reference numeral 110 denotes an object to be heated (a load that is a metal container such as a pan or a frying pan), 101 an induction heating coil that generates a high-frequency magnetic field and heats the object 110 to be heated, 109 Is a commercial AC power source, 108 is a rectifying / smoothing unit for rectifying the commercial AC power source, 102 is an inverter circuit that converts the power source rectified by the rectifying / smoothing unit 108 into high-frequency power and supplies high-frequency current to the induction heating coil 101, and 111 is an inverter A driving circuit of the circuit 102, 103 is an output detection unit for detecting the output level of the inverter circuit 102, 112 is a microcomputer, and 114 is an operation unit.
[0042]
The microcomputer 112 includes a control unit 104, a first movement detection unit 106, and a first storage unit 107, and the functions of these blocks are processed by software. The first storage unit 107 is a built-in RAM (Random Access Memory) of the microcomputer 112.
The operation unit 114 includes a setting input unit 105 and a setting display unit 113 that displays a setting output of the induction heating device.
The induction heating apparatus of Example 1 has a mechanism (mechanism shown in FIG. 25) similar to that of the induction heating cooker of Conventional Example 2. The operation unit 114 is provided on the front surface of the housing. Each other block is stored in the housing. The object to be heated 110 is placed on a ceramic top plate having a thickness of 4 mm arranged at the upper part of the casing.
[0043]
The setting input unit 105 includes a plurality of input key switches operated by the user to input a heating output setting command or a heating start or stop command. The heating output setting determines the target output of the control unit 104. In the embodiment, the target output is the input current value of the inverter circuit 102. The setting input unit 105 is connected to the control unit 104. The command input by the setting input unit 105 is input to the control unit 104.
The setting display unit 113 is connected to the control unit 104. The control unit 104 controls the setting display unit 113. The setting display unit 113 displays the heating output setting content set through the setting input unit 105 to the user.
[0044]
FIG. 4 is a principal plan view showing the configuration of the operation unit 114 of the induction heating apparatus of the first embodiment. The operation unit 114 includes a heating off / on key switch 1601, a heating output setting unit 1602, and a setting display unit 113. When the user presses the heating off / on key switch 1601, heating can be started or stopped. When the user selectively presses the three key switches of the heating output setting unit 1602, the heating output can be set in three output stages. Pressing the large key switch selects a high heating output (large output stage), pressing the small key switch selects a low heating output (small output stage), and pressing the middle key switch between large and small Heating power is selected (middle power stage). Heating off / on key switch 1601 and heating output setting unit 1602 constitute setting input unit 105.
The setting display unit 113 selectively displays one of the three LEDs and displays the selected output stage.
[0045]
In the induction heating apparatus of Example 1, when the set output stage is medium or small, the first movement detection unit 106 detects the movement of the object to be heated 110 due to buoyancy, and the object to be heated 110 has moved. When this is detected, the control unit 104 shifts to a first output fixing mode 523 (FIG. 8, described later). When the set output stage is large, the first movement detection unit 106 does not detect the movement of the article 110 to be heated.
[0046]
The first movement detection unit 106 detects the movement (including displacement and floating) of the object to be heated 110.
The control unit 104 responds to various commands input from the setting input unit 105, an output signal of the output detection unit 103 (a signal corresponding to the power supply current of the inverter circuit 102), and an output signal of the first movement detection unit 106. The output of the inverter circuit 102 is controlled through the drive circuit 111. The fluctuation of the heating output is performed by controlling the driving frequency of the switching element or the driving time ratio of the two switching elements.
When the first movement detection unit 106 does not detect the movement of the object to be heated 110, the control unit 104 performs control so that the output (power supply current) of the output detection unit 103 becomes the set target current value (stable). Called control mode.)
When the first movement detection unit 106 detects the movement of the article 110 to be heated, the control unit 104 outputs a control value stored in the first storage unit 107 (referred to as a first output fixed mode). .
[0047]
The commercial power supply 109 is input to the rectifying / smoothing unit 108. The rectifying / smoothing unit 108 includes a full-wave rectifier 108a formed of a bridge diode, and a first smoothing capacitor 108b connected between the DC output terminals.
The input terminal of the inverter circuit 102 is connected to both ends of the first smoothing capacitor 108b (the output terminal of the rectifying / smoothing unit 108). An induction heating coil 101 is connected to the output terminal of the inverter circuit 102. The inverter circuit 102 and the induction heating coil 101 constitute a high frequency inverter. The inverter circuit 102 includes a series connection body ("series connection body 102c") of a first switching element 102c (in this embodiment, an IGBT (Insulated Gate Bipolar Transistor)) and a second switching element 102d (in this embodiment, an IGBT). And 102d "). The first diode 102e is connected to the first switching element 102c in the reverse direction and in parallel, and the second diode 102f is connected to the second switching element 102d in the reverse direction and in parallel. A second smoothing capacitor 102b is connected to both ends of the series connection bodies 102c and 102d.
[0048]
A choke coil 102a is connected between the connection point of the first switching element 102c and the second switching element 102d (referred to as “the midpoint of the series connection bodies 102c and 102d”) and the positive terminal of the full-wave rectifier 108a. Is done. The low potential terminals of the series connectors 102c and 102d are connected to the negative terminal (the ground terminal in the embodiment) of the full-wave rectifier 108a. A series connection body of the induction heating coil 101 and the resonance capacitor 102g is connected between the midpoint of the series connection bodies 102c and 102d and the negative terminal of the full-wave rectifier 108a.
[0049]
The output detection unit 103 includes a current transformer 103a and a power supply current detection unit 103b. The current transformer 103a detects a current (input power supply current) input from the commercial power supply 109 by the inverter circuit 102 and outputs a detection current to the power supply current detection unit 103b. The power supply current detection unit 103b generates a detection signal proportional to the magnitude of the power supply current (equivalent to the output value of the inverter circuit 102. The detection signal is abbreviated as “power supply current”) and the control unit 104 and the first movement detection unit. It outputs to 106.
The first movement detection unit 106 detects the movement (including deviation and floating) of the object to be heated 110 based on the change in the power input current of the inverter circuit 102 and transmits the movement detection information to the control unit 104. . The method for the first movement detection unit 106 to detect the movement (including displacement and floating) of the article 110 to be heated is the same as the movement detection unit 5706 of the second conventional example.
The control unit 104 drives the first switching element 102 c and the second switching element 102 d through the drive circuit 111.
[0050]
The operation of the induction cooking device configured as described above will be described. The full wave rectifier 108 a rectifies the commercial AC power supply 109. The first smoothing capacitor 108 b supplies power to the high-frequency inverter having the inverter circuit 102 and the induction heating coil 101.
FIG. 3 shows the waveform of each part in the present embodiment. A waveform (a) shows a current waveform Ic2 flowing through the second switching element 102d and the second diode 102f. A waveform (b) shows a current waveform Ic1 flowing through the first switching element 102c and the diode 102e. A waveform (c) shows a voltage Vce2 generated between the collector and the emitter of the second switching element 102d. A waveform (d) shows a voltage Vce1 generated between the collector and the emitter of the first switching element 102c. A waveform (e) shows the current IL flowing through the induction heating coil 101.
[0051]
When the second switching element 102d is on, a resonance current flows through a closed circuit including the second switching element 102d (or the second diode 102f), the induction heating coil 101, and the resonance capacitor 102g. At the same time, energy is stored in the choke coil 102a. When the second switching element 102d is turned off, the stored energy is discharged to the second smoothing capacitor 102b through the first diode 102e.
[0052]
After the second switching element 102d is turned off, the first switching element 102c is turned on, and a current flows through the first switching element 102c and the first diode 102e. A resonance current flows through a closed circuit including the first switching element 102c (or the first diode 102e), the induction heating coil 101, the resonance capacitor 102g, and the second smoothing capacitor 102b.
[0053]
The driving frequency of the first switching element 102c and the second switching element 102d is variable in the vicinity of about 20 kHz. When heating an object to be heated (typically an iron cooking vessel), a high frequency current of about 20 kHz flows through the induction heating coil 101. The drive time ratio of the first switching element 102c and the second switching element 102d can be varied in the vicinity of about ½ as shown in FIG. The impedance of the induction heating coil 101 and the resonant capacitor 102g is a specified material (for example, a high-conductivity nonmagnetic material such as aluminum) and has a standard size (for example, a diameter equal to or greater than the diameter of the induction heating coil) When the cooking pan 110 is placed in a designated place (for example, a place shown as a heated portion) of the top plate, the resonance frequency is set to be about three times the driving frequency. Therefore, in this case, the resonance frequency is set to be about 60 kHz.
[0054]
If the object to be heated 110 is made of aluminum, a high frequency current of about 60 kHz, which is a higher frequency than usual, flows through the induction heating coil 101, so that the cooking pot 110 can be heated efficiently. The high-frequency inverter of this embodiment has high heating efficiency because the regenerative current flowing through the first diode 102e and the second diode 102f does not flow through the first smoothing capacitor 108b but is supplied to the second smoothing capacitor 102b.
[0055]
The second smoothing capacitor 102b smoothes the envelope (envelope) of the high-frequency current supplied to the induction heating coil 101 from the conventional induction heating device. Thereby, the commercial frequency component of the current IL flowing through the induction heating coil 101 that causes vibration noise from the pan 110 or the like during heating is reduced.
When the high frequency inverter of the present embodiment is operated under a certain driving condition (frequency, driving time ratio, etc.), when the magnetic coupling between the cooking pot 110 and the induction heating coil 101 is reduced, the input power (current) of the induction heating coil 101 is reduced. IL).
[0056]
The control unit 104 inputs an output signal (output value of the inverter circuit 102) proportional to the magnitude of the power source current of the induction heating device (power source current of the inverter circuit 102) from the output detection unit 103, and the magnitude of the signal is Control to achieve the target value. The control unit 104 varies the drive frequencies of the first switching element 102c and the second switching element 102d so that the input power (output value of the high frequency inverter) of the induction heating coil 101 becomes a target value, or both switching elements. The drive time ratio is varied and controlled.
When the high-frequency inverter (including the inverter circuit 102 and the induction heating coil 101) of this embodiment is operated under constant driving conditions (frequency, driving time ratio, etc.), the object 110 and the induction heating coil 101 are heated. When the magnetic coupling decreases, the input power (current IL) of the induction heating coil 101 decreases (the detailed description of this phenomenon is described in the description of the conventional example 2).
[0057]
FIG. 5 is a flowchart illustrating a method for controlling the induction heating apparatus according to the first embodiment. FIG. 6 is a timing chart showing a change in the control value output from the control unit 104 of the induction heating apparatus according to the first embodiment. In FIG. 6, the horizontal axis is time, and the vertical axis is a control value output by the control unit 104. In FIG. 6, a vertical broken line indicates a time point when the mode is switched (the same applies to timing charts including other mode displays). The control method of the induction heating apparatus of Example 1 is demonstrated using FIG.5 and FIG.6.
[0058]
First, the user presses the heating off / on key switch 1601 of the setting input unit 105 to input a heating start command, and presses the key switch of the heating output setting unit 1602 to input a setting command for the heating power output stage. The controller 104 inputs a heating start command and starts heating (step 501). A target value of the power supply current I input by the inverter circuit 102 is determined according to the set output stage of the thermal power. First, the control unit 104 enters the arrival control mode 521. The arrival control mode 521 has steps 502 to 508. In the arrival control mode 521, after starting heating, the controller 104 checks whether or not the object to be heated has moved, and gradually increases the heating output from a small state to a set output at a substantially constant speed ( The heating output (control value) is increased (so that the time derivative of the control value output by the control unit 104 becomes substantially constant) (FIG. 6). If the object to be heated 110 does not move in the middle, the control unit 104 increases the control value until the power supply current detected by the output detection unit 103 reaches the target value I set by the setting input unit 105.
[0059]
In step 502, the control unit 104 sets the control value P to P0 (initial value). P0 is a value that is small enough that the heated object 110 does not move, no matter how light the heated object 110 is, as long as the induction heating device allows. The inverter circuit 102 applies electric power (displayed as electric power P) corresponding to the control value P to the induction heating coil 101 (step 503). Specifically, the control value P output from the control unit 104 determines conditions (drive time, frequency, drive time ratio, etc.) for driving the switching element 102c and the switching element 102d of the inverter circuit 102. The input current of the inverter circuit 102 changes according to the drive time, drive frequency, or drive time ratio.
[0060]
It is checked whether or not the set output stage is large (step 504). If the set output stage is large, the process proceeds to step 506 (the first movement detection unit 106 does not operate). If the set output stage is not large (medium or small), the process proceeds to step 522. In step 522, the first movement detection unit 106 checks whether or not the object to be heated has moved.
Step 522 includes steps 531 and 532. In step 531, the first movement detection unit 106 calculates the slope (time differential value) ΔI of the power supply current (the value corresponding to the measured value of the power supply current I input by the inverter circuit 102) detected by the output detection unit 103. To do. Next, a ratio between the current change amount ΔI and the previous change amount ΔI (the ratio value has a positive / negative polarity) is calculated, and whether or not the ratio is less than a threshold value (for example, 0.7). Is checked (step 532). If the ratio is less than the threshold value (including the case where the current change amount is negative), the first movement detection unit 106 determines that the article to be heated 110 has moved. In that case, the control unit 104 shifts from the arrival control mode 521 to the first output fixing mode 523.
[0061]
If the ratio is equal to or greater than the threshold value, the process proceeds to step 506. The value of P (control value of the control unit 104) is stored in the first storage unit 107 (step 506). The control unit 104 checks whether or not the power supply current detected by the output detection unit 103 is equal to or greater than a target value (step 507). If the power supply current detected by the output detection unit 103 is equal to or greater than the target value, the control unit 104 shifts from the arrival control mode 521 to the stable control mode 524. If the power supply current detected by the output detection unit 103 is less than the target value, the control unit 104 increases the control value (power) P by a predetermined control value ΔP1 (step 508). Returning to step 503, the above steps are repeated. In the embodiment, the processes of steps 503 to 508 are repeatedly executed at regular time intervals.
In step 532, even if the difference between the current change amount ΔI and the previous change amount ΔI is calculated (the difference value has a positive / negative polarity), it is checked whether the difference is less than the threshold value. good.
[0062]
In the first output fixing mode 523, the control unit 104 outputs a constant control value (FIG. 6). The first output fixing mode 523 includes steps 509 and 510. In step 509, the control unit 104 reads the value of P from the first storage unit 107. P is a control value before the first movement detection unit 106 detects the movement of the object to be heated 110 (in a state where the object to be heated 110 is not moving). P is the maximum output value that does not detect panning or floating. The control unit 104 continuously outputs the read control value (power) P (does not perform feedback control) (step 510). Electric power P is applied to the induction heating coil 101. The heated object 110 does not move. In the first output fixing mode 523, even if the user cooks while moving the object to be heated 110, the induction heating device stably heats the object to be heated 110. Finish the process. For example, if the output value of the control unit 106 is fixed in the first output fixing mode 523, even if the object to be heated 110 is moved, the electric power P that heats the object 110 to be heated by the combination of the object to be heated 110 and the induction heating coil 101. The heating can be continued without stopping or being suppressed by very small electric power.
[0063]
In the stable control mode 524, the control unit 104 performs control (feedback control) (the broken line in FIG. 6) so that the induction heating coil 101 outputs the target heating power (the inverter circuit 102 inputs the target power supply current). ). The stable control mode 524 includes steps 511 to 514. In the embodiment, the processes of steps 511 to 514 are repeatedly executed at regular time intervals. In step 511, it is checked whether or not the power supply current I detected by the output detection unit 103 is equal to the target value (a slight error may be allowed). If the power supply current I is equal to the target value, step 511 is repeated. If the power supply current I is not equal to the target value, the process proceeds to step 512. It is checked whether or not the power supply current I is larger than the target value (step 512). If the power supply current I is larger than the target value, the process proceeds to step 514. If the power supply current I is smaller than the target value, the process proceeds to step 513. The control unit 104 increases the control value (power) P by a predetermined control value ΔP2 (step 513). Returning to step 511, the above steps are repeated.
[0064]
In step 514, the control unit 104 decreases the control value (power) P by a predetermined control value ΔP2. Returning to step 511, the above steps are repeated.
The values of ΔP1 and ΔP2 are arbitrary, and they may be the same. The increase amount and decrease amount ΔP2 in steps 513 and 514 may be different from each other.
In the first output fixing mode 523, the induction heating apparatus of the present invention for heating an object to be heated with the maximum heating power within a range in which the object to be heated does not move (a heating power obtained by subtracting a predetermined correction value from the maximum heating power) For example, substantially larger electric power is supplied as compared with the induction heating apparatus of Conventional Example 2 that repeats the operation shown in FIG.
[0065]
For example, it is assumed that the user cooks while moving the pan (the object to be heated 110). When it is detected that the object to be heated 110 has moved as in the prior art, the inverter circuit 102 is stopped, or the output of the inverter circuit 102 is suppressed to a predetermined low output (a low output that does not move in any pan). The power (average power) that is substantially consumed by the heated object 110 is reduced, and in cooking that requires a high heating power (high output) such as fried food cooking, it cannot be sufficiently heated and becomes inconvenient and easy to use. There was no fear of becoming a cooker. However, in the first embodiment, when the first movement detecting unit 106 detects the movement of the object to be heated 110, the heating object 110 is again stopped without stopping the heating operation or reducing it to a very small heating output. However, the heating of the object to be heated 110 can be continued with a larger heating output within a range where no movement occurs. Therefore, during actual cooking (not limited to fried food cooking), it is possible to increase the average heating power when the first movement detector 106 detects movement.
[0066]
In stir-fry cooking, where frying pans are often moved artificially, high heating power is required, so the induction heating device is often set to a large output stage with high output. Therefore, in this embodiment, when the set output stage is large (the highest output stage), the load movement detection function of the first movement detection unit 106 is invalidated. By doing so, when the induction heating device is set to a large output stage, even if the user moves the object to be heated, the movement of the object to be heated is not substantially detected, and as a result, the heating output Does not drop or stop heating. The user can cook without being disturbed by the safety function based on the movement of the object to be heated.
[0067]
Next, the case where an aluminum pan is used for stew cooking will be described. In stewed dishes that continue to be heated with low heat for a long time, the user often leaves the object to be heated. During cooking, there is a possibility that the water in the pan disappears and the lightened pan floats and moves due to the action of the magnetic field. In stewed cooking, the output stage (heating output) is often set to low or medium power to prevent scorching.
Therefore, when the output stage is set to medium or small, the first movement detection unit 106 is enabled and detects the movement of the object to be heated (load).
In the present embodiment, a dedicated input unit (for example, a switching unit) for switching between valid / invalid of the first movement detection unit 106 is not provided. The valid / invalid switching of the first movement detection unit 106 is performed in association with the heating output setting unit 1602 which is a normal setting input unit. The induction heating apparatus automatically performs switching of the control method according to the usage method without intentional operation by the user. The present invention realizes an easy-to-use induction heating apparatus.
[0068]
In the first embodiment, the function of the first movement detection unit 106 is suppressed or invalidated according to the setting content in the heating output setting unit 1602 (the output stage in the first embodiment). Thereby, the inconvenience in cooking by the safety function based on the movement of a to-be-heated material working improperly can be eased. An induction heating apparatus having improved usability can be realized.
In order to suppress or stop the function of the first movement detection unit 106, the detection method or the detection sensitivity may be changed, the detection method and the detection sensitivity may be the same, and the suppression degree may be changed. It may be changed at the same time.
The induction heating apparatus according to the first embodiment includes a heating output setting unit 1602 that switches the heating output to three levels of large, medium, and small. However, the present invention is not limited to this, and the heating output stage may be two stages or four stages or more. Furthermore, you may enable it to set a heating output what is called continuously. In any case, the same effect as in the present embodiment can be obtained.
[0069]
In the first embodiment, the first movement detection unit 106 is switched between enabled and disabled in accordance with the heating output setting values (output stage) of large, medium, and small. Instead of this, for example, the threshold value of the slope (time differentiation) of the power supply current input by the inverter circuit 102 serving as a reference for detection determination of the first movement detection unit 106 may be changed. For example, in the output stage where the heating output is large, the threshold value of the slope of the power supply current input by the inverter circuit 102 serving as the load movement detection criterion is reduced. That is, the sensitivity for determining that the heated object has moved due to buoyancy is dulled, making it difficult to detect load movement. In the output stage where the heating output is small, the threshold value of the slope of the power supply current input to the inverter circuit 102 serving as a load movement detection criterion is increased, that is, the sensitivity for determining that the heated object has moved due to buoyancy is increased. Thus, the first movement detection unit 106 makes it easy to detect load movement.
[0070]
For example, in step 532 of FIG. 5, if the output stage is large, the threshold value is changed from 0.7 to 0 (only when the current change amount ΔI becomes negative), the first movement detection unit 106 It is determined that the heated object 110 has moved).
For example, in step 532, when the difference between the current change amount ΔI and the previous change amount ΔI is calculated and it is checked whether the difference is less than the threshold value, the threshold value is set if the output stage is large. Change the normal value from 10 to 0.
For example, in step 532, if the output stage is medium or small, it is detected whether or not the object to be heated has moved once. If the output stage is large, it is detected whether or not the object to be heated has moved a plurality of times at a predetermined interval, and it is determined that the object to be heated 110 has moved continuously for a predetermined number of times (for example, 10 times). Only the object 110 to be heated may be determined to have moved.
By doing in this way, the same effect as the above-mentioned case is acquired.
[0071]
Even if the control unit 104 inputs signals from the first movement detection unit 106 and the heating output setting unit 1602 and similarly controls the heating output such as continuing, stopping, and lowering the heating output, The same effect can be obtained. For example, when the function of the first movement detection unit 106 is always enabled and the first movement detection unit 106 detects the movement of the object to be heated 110, the setting content (output stage) of the heating output setting unit 1602 is medium or If small, the control unit 104 shifts to the first output fixing mode, and if the output stage is large, the control unit 104 continues normal operation.
[0072]
In the present embodiment, the first movement detection unit 106 detects the movement of the object to be heated based on the slope of the power supply current input by the inverter circuit 102. The method by which the first movement detection unit 106 detects the movement of the object to be heated is arbitrary. For example, the first movement detection unit 106 may detect the movement of the object to be heated based on a change in induction heating coil current and a change in resonance capacitor voltage. The first movement detection unit 106 may detect the movement of the object to be heated using an optical or mechanical sensor. What is necessary is just to meet the main point of this invention that the safety function based on the movement of a to-be-heated object is suppressed or invalidated according to the setting content in an operation part (input part).
[0073]
In the present embodiment, the first movement detection unit 106 observed the temporal change of the heating coil current at the time of soft start at the start of heating (arrival control mode), and detected floating or movement of the object to be heated. In the stable control mode, the induction heating coil current or other current or voltage related to the induction heating coil output may be measured, and the change may be observed to detect the movement of the heated object due to the buoyancy.
For example, when the power supply current decreases from the stable control state, the pan moves due to buoyancy due to the passage of a predetermined time or more from the start of the decrease until the original control stable state or the return to the predetermined value. Can be judged.
In another embodiment, in the arrival control mode, when the first movement detection unit 106 detects the movement of the object to be heated, the control unit 104 outputs the output of the output detection unit 103 previously stored in the first storage unit 107. The process shifts to a stable control mode in which a value derived based on the value is a target output.
[0074]
In the embodiment, the inverter circuit 102 is a two-stone inverter circuit. However, the present invention is not limited to this, and any circuit in which the input current changes due to a magnetic coupling change with the load (object 110) can be used. For example, a one-stone voltage resonance inverter circuit may be used.
The setting display unit 113 may be an LCD (liquid crystal), for example. The setting display of the setting display unit 113 may be a digital numerical value display.
The set target value and the detection data of the output detection unit 103 are not limited to the input current value of the inverter circuit 102. For example, it may be an input current value of the entire induction heating device (the input current of the entire induction heating device is substantially equal to the input current of the inverter circuit 102). For example, the value of the induction heating coil current may be used.
[0075]
The first movement detection unit 106 may detect the movement of the object to be heated 110 by another method. For example, the movement of the object to be heated may be detected based on a change in the slope (time differentiation) of the coil current flowing through the induction heating coil while gradually increasing the heating output at the start of heating. For example, a weight sensor that detects the weight of the object to be heated may be provided.
In the present embodiment, the first storage unit 107 stores the control value output from the control unit 104. Instead, the first storage unit 107 may store the output value of the output detection unit 103 (the input power supply current of the inverter circuit 102 or the current of the induction heating coil 101). The control unit 104 is configured based on the output value of the output detection unit 103 before the first movement detection unit 106 detects the movement of the object to be heated 110 and the slope of the current flowing through the induction heating coil, for example. The control value output by is derived. Typically, the control unit 104 outputs a control value such that the maximum current flows through the induction heating coil 101 within a range in which the object to be heated 110 does not move.
[0076]
In the present embodiment, when the first movement detection unit 106 detects the movement of the object to be heated 110 during the arrival control mode 521, the control unit 104 changes from the arrival control mode 521 to the first output fixing mode 523. Moved. In another embodiment, the following control method is executed instead. In the arrival control mode, the first storage unit 107 stores the output value (or control value) of the output detection unit 103 before the first movement detection unit 106 detects the movement of the article 110 to be heated. When the first movement detection unit 106 detects the movement of the object to be heated, the control unit 104 outputs the output value (or control value) of the output detection unit 103 previously stored in the first storage unit 107 (the object to be heated moves). The target output is a value derived based on (a maximum value in a range not to be used) (for example, the maximum value itself or a value obtained by subtracting a predetermined correction value from the maximum value). To the stable control mode. Thereby, the effect similar to Example 1 is acquired.
[0077]
Example 2
The induction heating apparatus (induction heating cooker) of Example 2 of this invention is demonstrated using FIG.7 and FIG.8. The induction heating apparatus of the second embodiment has the same block diagram (FIG. 1) and mechanism as those of the first embodiment. The induction heating apparatus of Example 1 has the same configuration as that of Example 1 except that the operation unit (FIG. 7) and the control method (FIG. 8) are different from those of Example 1 (FIGS. 4 and 5). Since the basic configuration of the present embodiment is the same as that of the first embodiment, differences will be mainly described. The same functions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0078]
FIG. 7 is a plan view of a principal part showing the configuration of the operation unit of the induction heating apparatus of the second embodiment. The operation unit includes a heating off / on key switch 1801, a fried food cutting / on key switch 1802 (stir fry cooking selection unit), a heating output setting unit 1803, and a setting display unit 1804. When the user presses the heating off / on key switch 1801, heating can be started or stopped. The user can set the output stage of the heating output by selectively pressing the two key switches of the heating output setting unit 1803. When the right key switch 1811 is pressed, a high heating output is selected step by step, and when the left key switch 1812 is pressed, a low heating output is selected step by step. When the user presses the stir-fry cut / enter key switch 1802, the stir-fry mode or the normal mode can be selected. The heating off / on key switch 1801, the fried food off / on key switch 1802, and the heating output setting unit 1803 constitute a setting input unit 105. The setting display unit 1804 selectively displays one of the seven LEDs, displays the selected output stage, turns the stir-fry LED on or off, and determines whether the stir-fry mode is selected. Is displayed.
[0079]
FIG. 8 is a flowchart illustrating a method for controlling the induction heating apparatus according to the second embodiment.
FIG. 8 is obtained by replacing step 504 in FIG. 5 with step 1904 (according to this, the code of the arrival control mode is changed from 521 to 1921). In other respects, FIG. 8 is the same as FIG. Starting from step 503, only the vicinity of step 1904 will be described.
The inverter circuit 102 applies electric power (electric power P) corresponding to the control value P to the induction heating coil 101 (step 503). Specifically, the control value P output from the control unit 104 determines conditions (drive time, frequency, drive time ratio, etc.) for driving the switching element 102c and the switching element 102d of the inverter circuit 102. The input current of the inverter circuit 102 changes according to the driving time, the driving frequency, or the driving time ratio.
[0080]
It is checked whether or not the current stir-fry mode is selected (step 1904). If it is a fried food mode, it will progress to Step 506 (the 1st movement detection part 106 does not operate). If not in the fried food mode (if in the normal mode), the process proceeds to step 522. In step 522, the first movement detection unit 106 checks whether or not the article to be heated 110 has moved. When the article to be heated 110 moves, the control unit 104 moves from the arrival control mode 521 to the first output fixing mode 523.
If the object to be heated 110 does not move, the process proceeds to step 506. Thereafter, the same processing as in the first embodiment is performed.
[0081]
When cooking the fried food, a frying pan is used as the object 110 to be heated. By pressing the fried food selection unit 1802, the fried food cooking mode is selected, and heating is started. The stir-fry LED in the setting display area 1804 is turned on. In stir-fry cooking, the user usually cooks with high heating power while countering the food with the induction heating device. In the second embodiment, when the fried food cooking mode is selected, the load movement detection function of the first movement detection unit 106 is disabled. When fried food is cooked, the user may move the frying pan that is the object to be heated 110 in order to cook the food. In the fried food cooking mode, since the load movement detection of the first movement detection unit 106 is disabled, even if the user moves the object to be heated 110, the first movement detection unit 106 detects the load movement. do not do. Even if the user moves the object to be heated 110, the induction heating device maintains a high output without decreasing the heating output and without stopping.
[0082]
Next, when stewed cooking is performed, the heating output setting unit 1803 is operated. When the user presses the heating off / on key switch 1801, the induction heating device starts heating. The stir-fry LED in the setting display portion 1804 is turned off. The user sets the thermal power through the heating output setting unit 1803. When the user starts cooking by pressing the heating off / on key switch 1801, the load movement detection function of the first movement detection unit 106 becomes effective. The first movement detection unit 106 detects the movement of the object to be heated. When the movement of the object to be heated is detected, the induction heating device decreases the heating output or stops the heating. This prevents the object to be heated from moving.
[0083]
In addition, the change input unit, the stir-fried food selection unit (stir-fried food cut / enter key switch) 1802 is provided as an independent key switch, so that the operation of the induction heating device is simple and easy to understand. The user can invalidate or suppress the load detection function as necessary.
The stir-fry cooking mode may be selected by deleting the stir-fry cutting / on key switch 1802 and pressing the heating off / on key switch 1801 three times in a short interval, for example (the heating off / on key switch 1801 Also used as a change input unit). Space saving of the operation unit can be achieved.
In the second embodiment, when the fried food cooking selection unit 1802 is operated, the load movement detection function of the first movement detection unit 106 is disabled. Instead of disabling the load movement detection function of the first movement detection unit 106, the load detection function of the first movement detection unit 106 may be made substantially difficult to work.
[0084]
In Example 2, “stir fry” was provided as an example of the change input unit. However, the present invention is not limited to this, and it is needless to say that a similar switch may be provided as the change input unit for other artificially moving objects to be heated, for example, “eggaki” cooking.
In Examples 1 and 2, a key switch was provided in the operation unit. Instead of this, an arbitrary changing unit such as a dial, a sound input unit, and a voice recognition input unit may be provided. The effect of the present invention can be obtained when a cooking method for manually moving an object to be heated is selected by the changing unit.
[0085]
In the embodiment, the control unit 104 and the inverter circuit 102 are switching element drive frequency control. Instead, the effect of the present invention can be obtained even when the control and inverter circuit operates by an output control method such as an input voltage control method or a switching element drive duty (drive time ratio) control method.
In order to suppress or stop the function of the first movement detection unit 106, the detection method or the detection sensitivity may be changed, the detection method and the detection sensitivity may be the same, and the suppression degree may be changed. It may be changed at the same time.
In another embodiment, in the arrival control mode, when the first movement detection unit 106 detects the movement of the object to be heated, the control unit 104 outputs the output of the output detection unit 103 previously stored in the first storage unit 107. The process shifts to a stable control mode in which a value derived based on the value is a target output.
[0086]
In the induction heating apparatuses of the first and second embodiments, the control method may be changed as follows. When the first movement detection unit 106 detects the movement of the object to be heated in the arrival control mode, the control unit 104 may stop the inverter circuit. For example, by setting the output stage set by the heating output setting unit large, or by setting the stir-fried food mode, the detection sensitivity of the movement detection unit is dulled or detected, or the control unit 104 The suppression operation may not be weakened or performed.
[0087]
Example 3
The induction heating apparatus (induction heating cooker) of Example 3 of this invention is demonstrated using FIGS. FIG. 9 is a schematic block diagram of the induction heating apparatus according to the third embodiment. FIG. 10 shows a circuit block diagram of the induction heating apparatus of the third embodiment.
[0088]
9 and 10, reference numeral 109 denotes a commercial AC power source, 101 denotes an induction heating coil that generates a high-frequency magnetic field and heats the article 110 (pot) to be heated, and 102 denotes an inverter circuit that supplies the induction heating coil 101 with a high-frequency current. Reference numeral 103 denotes an output detection unit that detects the power supply current of the inverter circuit 102, reference numeral 4006 denotes a movement detection unit that detects the movement (deviation or floating) of the heated object 110 from a change in the power supply current value output by the output detection unit 103, and reference numeral 4004 denotes A control unit that controls the output of the inverter circuit 102 based on the output of the output detection unit 103 and the output of the movement detection unit 4006, 111 is a drive circuit, and 4014 is an operation unit. The operation unit 4014 includes a movement detection stop input unit 4001 configured by key switches, a setting input unit 4005 configured by key switches for inputting a thermal power level, and a setting display unit 4013 for displaying the thermal power level.
[0089]
The induction heating apparatus of the third embodiment has the same mechanism as that of the first embodiment.
The control unit 4004 and the movement detection unit 4006 are included in the microcomputer 112. The functions of the control unit 4004 and the movement detection unit 4006 are executed by software. The detection operation of the movement detection unit 4006 is the same as that of the first movement detection unit 106 of the first embodiment. The control operation of the control unit 4004 is basically the same as that of the control unit 104 of the first embodiment. The same blocks as those in the first embodiment are denoted by the same reference numerals. These descriptions are omitted.
[0090]
When the movement detection unit 4006 does not detect the movement of the object to be heated 110, the control unit 4004 controls the output of the output detection unit 103 (the output of the inverter circuit 102) to be the set power (current). When the movement detection unit 4006 detects the displacement or floating of the article 110 to be heated, the control unit 4004 rapidly decreases the control value so that the output of the inverter circuit 102 becomes a predetermined low power.
[0091]
FIG. 11 is a plan view of a main part of the operation unit 4014 of the induction heating apparatus according to the third embodiment. The operation unit 4014 includes a setting input unit 4005, a movement detection stop input unit 4001, and a movement detection stop input unit 4001 (a floating detection stop key switch).
The setting input unit 4005 has an on / off key switch for inputting an inverter start / stop command, a down key switch for setting the inverter's thermal power (down and up in the thermal power output stage), and an up key switch. The setting display unit 4013 has seven visible LEDs (light emitting diodes) corresponding to the numerical displays 1 to 7. When the inverter is activated, the LED corresponding to the set output stage of the thermal power is turned on. In the embodiment, if the thermal power output stage is the i-th stage (1 ≦ i ≦ 7), i LEDs corresponding to the numbers from 1 to i are turned on. In the movement detection stop mode, i LEDs blink.
The movement detection stop input unit 4001 inputs a command to stop the movement detection unit 4006 from detecting the movement of the object to be heated 110. By pressing a key switch of the movement detection stop input unit 4001, the detection operation of the movement detection unit 4006 can be stopped. The movement detection unit 4006 does not detect the movement of the object to be heated 110 during the stop period.
[0092]
FIG. 12 is a diagram illustrating a change in input current of the inverter circuit 102 when the movement detection unit 4006 is stopped by a stop command input from the movement detection stop input unit 4001. The horizontal axis represents the time from the start of output, and the vertical axis represents the input current. As shown in FIG. 12, when the object to be heated 110 moves, the input current fluctuates due to a change in the magnetic coupling between the object to be heated and the induction overheating coil 1.
When the high-frequency inverter (including the inverter circuit 102 and the induction heating coil 101) of this embodiment is operated under constant driving conditions (frequency, driving time ratio, etc.), the object 110 and the induction heating coil 101 are heated. When the magnetic coupling decreases, the input power (current IL) of the induction heating coil 101 decreases (the detailed description of this phenomenon is described in the description of the conventional example 2).
[0093]
Operation | movement of the induction heating cooking appliance of Example 3 is demonstrated. By operating the key switch of the setting input unit 4005, the control unit 4004 inputs drive signals to the two switching elements of the inverter circuit 102 through the drive circuit 111, and turns on / off the switching elements. The input current of the inverter circuit 102 (output power of the inverter circuit 102) changes according to the frequency of the drive signal and the drive time ratio of the two switching elements. The control unit 4004 performs feedback control so that the output power of the inverter circuit 102 matches the power set by the setting input unit 4005. When the movement detection unit 4006 is in operation (referred to as “normal mode”), the movement detection unit 4006 detects the movement (displacement or floating) of the object to be heated, and the control unit 4004 By changing the drive frequency and the drive time ratio, the input current of the inverter circuit 102 is decreased suddenly or gradually.
[0094]
When the movement detection unit 4006 is stopped (referred to as “movement detection stop mode”), even if the object to be heated is moving, the control unit 4004 changes the frequency of the drive signal and the drive time ratio to change the inverter. The circuit 102 outputs the target power. When the user is cooking with the frying pan in hand, the power closer to the target power can be obtained by setting the movement detection stop mode.
[0095]
FIG. 13 is a flowchart illustrating a method for controlling the induction heating apparatus according to the third embodiment. The control method of the induction heating apparatus of Example 3 is demonstrated using FIG. In the third embodiment, the movement detection stop mode and the normal mode are toggled by pressing the floating detection stop key switch.
In step 4401, it is checked whether or not the floating detection stop key switch (movement detection stop input unit) 4001 has changed from OFF to ON (whether it has been pressed). If the float detection stop key switch has been pressed, the process proceeds to step 4402. If not, the process proceeds to step 4405.
In step 4402, it is checked whether or not the current movement detection stop mode is set. If it is not the current movement detection stop mode, the movement detection stop mode is set (step 4403). If it is the current movement detection stop mode, the normal mode is set (step 4404).
[0096]
In step 4405, it is checked whether or not the movement detection stop mode is set. If it is the movement detection stop mode, the process proceeds to step 4407 (movement detection is not performed). If it is not the movement detection stop mode, the process proceeds to step 4406.
In step 4406, it is checked whether or not the movement detection unit 4006 has detected the movement of the pan (the object to be heated 110). If the movement of the pan (the object to be heated 110) is detected, the power applied to the induction heating coil 101 is decreased stepwise (may be rapidly decreased) (step 4408). Return to step 4401. In step 4408, for example, the inverter circuit may be stopped, the same control as in the first output fixing mode of the first embodiment may be performed, or the output of the inverter in which the pan does not move is set as the target output and the stable control mode. (Control so that the output of the inverter matches the target output) may be performed.
[0097]
If the movement of the pan (the object to be heated 110) is not detected in step 4406, the process proceeds to step 4407. In step 4407, the electric power applied to the induction heating coil 101 is changed stepwise, and the target electric power is applied to the induction heating coil 101. Return to step 4401.
In this embodiment, the inverter circuit 102 has a two-stone inverter configuration. As long as the input current changes due to the magnetic coupling change with the load (object 110), an inverter of any configuration or control system (for example, a one-stone voltage resonance inverter) may be used.
[0098]
The movement detection stop input unit 4001 is not limited to a key switch. For example, the movement detection stop input unit 4001 is a voice recognition unit. The voice recognizing unit sets a movement detection stop mode setting command or a movement detection stop mode release command (normal mode setting) according to a word (for example, “floating detection stop ON” or “floating detection stop OFF”) issued by the user. Command) to the control unit 4004.
For example, the movement detection stop input unit 4001 is a proximity sensor. The proximity sensor detects whether the user is in front of the induction heating device. During the period when the proximity sensor detects that the user is in front of the induction heating device, the control unit 4004 enters the movement detection stop mode. When the proximity sensor detects that the user is not in front of the induction heating device, the control unit 4004 enters the normal mode.
[0099]
Example 4
The induction heating apparatus (induction heating cooker) of Example 4 of this invention is demonstrated using FIG. 14, FIG. FIG. 14 is a schematic block diagram of the induction heating apparatus according to the fourth embodiment. The induction heating apparatus according to the fourth embodiment includes a first timer unit 4502 in addition to the configuration of the third embodiment (FIG. 9). The microcomputer 112 includes a control unit 4004, a movement detection unit 4006, and a first timer unit 4502. In the embodiment, the first timer unit 4502 operates by software. The induction heating device of the fourth embodiment is different from the third embodiment in the control method of the movement detection stop mode. The other points are the same as the third embodiment.
[0100]
FIG. 15 is a flowchart illustrating a method for controlling the induction heating apparatus according to the fourth embodiment. The control method of the induction heating apparatus of Example 4 is demonstrated using FIG. In the fourth embodiment, when the floating detection stop key switch 4001 is pressed, the movement detection stop mode is set for a predetermined time T0. When a predetermined time elapses (the first timer unit 4502 measures time), the mode returns to the normal mode, and the movement detection unit 4006 starts movement detection. The processing loop of FIG. 15 is repeatedly executed at regular time intervals.
In step 4601, it is checked whether or not the floating detection stop key switch (movement detection stop input unit) 4001 has changed from OFF to ON (whether it has been pressed). If the float detection stop key switch 4001 has been pressed, the process proceeds to step 4602. If not, the process proceeds to step 4603.
[0101]
In step 4602, T0 is loaded into the first timer unit 4502 (t = T0). In step 4603, it is checked whether t is 0 or not. If t is 0 (normal mode), the process proceeds to step 4605. If t is not 0 (movement detection stop mode), the process proceeds to step 4604.
In step 4604, t is decremented (first timer unit 4502). Proceed to step 4607.
[0102]
In step 4605, it is checked whether or not the movement detection unit 4006 has detected the movement of the pan (the object to be heated 110). If the movement of the pan (the object to be heated 110) is detected, the power applied to the induction heating coil 101 is decreased stepwise (may be rapidly decreased) (step 4608). Return to step 4601. In step 4608, for example, the inverter circuit 102 may be stopped, the same control as in the first output fixing mode of the first embodiment may be performed, or the inverter output in which the pan does not move is stably controlled as the target output. Control of the mode (control is performed so that the output of the inverter matches the target output) may be performed.
If the movement of the pan (object 110) is not detected in step 4605, the process proceeds to step 4607. In step 4607, the electric power applied to the induction heating coil 101 is changed stepwise, and the target electric power is applied to the induction heating coil 101. Return to step 4601.
[0103]
By stopping the movement detection unit 4006 for a predetermined time with the movement detection stop input unit 4001, even if the user moves the pan for cooking for a predetermined time, the heating output does not decrease. Since the normal mode is restored after a predetermined time has passed, there is no worry that the user forgets to return to the normal mode. Since the movement detection of the object to be heated is automatically resumed after a predetermined time has elapsed, the user can safely cook.
The movement detection stop input unit 4001 is not limited to a key switch. For example, the movement detection stop input unit 4001 is a voice recognition unit. The voice recognition unit sends a movement detection stop mode setting command to the control unit 4004 in accordance with a word (for example, “floating detection stop ON”) issued by the user. The controller 4004 enters the movement detection stop mode for a predetermined time T0.
[0104]
The induction heating devices of Examples 3 and 4 had a movement detection stop input unit 4001. It may replace with this and may have a movement detection suppression input part. When the movement detection suppression input unit inputs a movement detection suppression command, the control unit enters a movement detection suppression mode. In the movement detection suppression mode, the movement detection unit reduces the detection sensitivity, or the control unit weakens the operation of suppressing the operation of the inverter circuit (more closely to the normal operation (the state where the pan is not moving)). ).
In the movement detection stop mode or the movement detection suppression mode, the detection of the movement of the pan may be stopped or the threshold of the detection of the movement may be relaxed (changed so as to be difficult to detect), and when the movement of the pan is detected Control in which the control method of the control unit remains normal, control with a small difference from normal may be performed, or these may be combined.
[0105]
Example 5
An induction heating apparatus (induction heating cooker) according to Example 5 of the present invention will be described with reference to FIGS. FIG. 16 is a schematic block diagram of the induction heating apparatus of the fifth embodiment. FIG. 17 is a plan view of a principal part of the operation unit 4714 of the induction heating apparatus according to the fifth embodiment. The induction heating apparatus of the fifth embodiment has an output fixed input section (output fixed key switch) 4701 instead of the movement detection stop input section 4001 in the configuration of the third embodiment (FIG. 9). The induction heating apparatus of the fifth embodiment is different from the third embodiment in the control method of the movement detection stop mode. The other points are the same as the third embodiment.
[0106]
In the induction heating apparatus of the fifth embodiment, when the output fixing key switch 4701 is pressed, the output fixing mode is set. In the output fixing mode, the control unit 4004 fixes the frequency and the driving time ratio for driving the switching element 102c and the switching element 102d of the inverter circuit 102 to a predetermined value. Even when the user performs cooking while moving the frying pan or the like that is the object to be heated 110, stable thermal power can be obtained.
[0107]
FIG. 18 is a flowchart illustrating a method for controlling the induction heating apparatus according to the fifth embodiment. The control method of the induction heating apparatus of Example 5 is demonstrated using FIG. In the fifth embodiment, when the output fixing key switch 4701 is pressed, the output fixing mode is set. Pressing the UP, DOWN or ON / OFF key switch (FIG. 17) enters the normal mode.
In step 4901, it is checked whether or not the output fixing key switch (output fixing input unit) 4901 has been changed from OFF to ON (pressed). If the output fixing key switch is pressed, the output fixing mode is set (step 4902). If not, the process proceeds to step 4903.
[0108]
In step 4903, it is checked whether the up, down, or on / off key switch has been changed from OFF to ON (pressed). If any key switch is pressed, the normal mode is set (step 4904). If not, the process proceeds to step 4905.
In step 4905, it is checked whether or not the current output fixing mode is set. If it is not the current output fixed mode, the process proceeds to step 4907. If the current output is fixed, the process proceeds to step 4906.
[0109]
In step 4906 (output fixed mode), the control unit 4004 outputs a predetermined control value. The inverter circuit 102 applies predetermined power to the induction heating coil 101. Seven LEDs on the setting display unit 4013 blink to indicate that the current output fixing mode is set. It returns to step 4901.
In step 4907, it is checked whether or not the movement detection unit 4006 has detected the movement of the pan (the object to be heated 110). If the movement of the pan (the object to be heated 110) is detected, the electric power applied to the induction heating coil 101 is decreased stepwise (may be rapidly decreased) (step 4909). It returns to step 4901. In step 4909, for example, the inverter circuit may be stopped, the same control as in the first output fixing mode of the first embodiment may be performed, or the output of the inverter in which the pan does not move is set as the target output in the stable control mode. (Control so that the output of the inverter matches the target output) may be performed.
[0110]
In step 4907, if the movement of the pan (the object to be heated 110) is not detected, the power applied to the induction heating coil 101 is changed stepwise to apply the target power to the induction heating coil 101 (step 4908). . It returns to step 4901.
In the output fixing mode, when the user cooks while moving the lightweight object 110 such as a frying pan, the output is fixed, and thus the safety function is activated by detecting the movement of the object 110. In comparison, the average input power of the inverter circuit 102 increases. Cooking time can be shortened, and usability is improved.
The fixed output input unit 4701 is not limited to a key switch. For example, the output fixed input unit 4701 is a voice recognition unit. The voice recognition unit controls the setting command for the fixed output mode or the release command for the fixed output mode (the normal mode setting command) according to the words (for example, “fixed output ON” or “fixed output OFF”) issued by the user. Part 4004.
[0111]
Example 6
An induction heating apparatus (induction heating cooker) according to Embodiment 6 of the present invention will be described with reference to FIGS. FIG. 19 is a schematic block diagram of the induction heating apparatus of the sixth embodiment. The induction heating apparatus according to the sixth embodiment includes a second timer unit 5002 in addition to the configuration of the fifth embodiment (FIG. 16). The microcomputer 112 includes a control unit 4004, a movement detection unit 4006, and a second timer unit 5002. In the embodiment, the second timer unit 5002 is operated by software. The induction heating apparatus of the sixth embodiment is different from the fifth embodiment in the control method of the movement detection stop mode. The other points are the same as those of the fifth embodiment.
[0112]
FIG. 20 is a flowchart illustrating a method for controlling the induction heating apparatus according to the sixth embodiment. The control method of the induction heating apparatus of Example 6 will be described using FIG. In the sixth embodiment, when the output fixing input unit (output fixing key switch) 4701 is pressed, the output fixing mode is set for a predetermined time T0. When a predetermined time has elapsed (second timer unit 5002 counts time), the mode returns to the normal mode, and movement detection unit 4006 starts movement detection. The processing loop of FIG. 20 is repeatedly executed at regular time intervals.
In step 5101, it is checked whether or not the output fixing key switch (output fixing input unit) 4701 has changed from OFF to ON (whether it has been pressed). If output fixed key switch 4701 has been pressed, control proceeds to step 5102. If not, the process proceeds to step 5103.
[0113]
In step 5102, T0 is loaded into the second timer unit 5002 (t = T0). Next, in step 5103, it is checked whether t is 0 (normal mode or fixed output mode). If t is not 0, the process proceeds to step 5104 (output fixed mode). If t is 0, go to step 5106 (normal mode
In step 5104 (output fixed mode), t is decremented (second timer unit 5002). The control unit 4004 outputs a predetermined control value. The inverter circuit 102 applies predetermined power to the induction heating coil 101 (step 5105). Return to step 5101.
[0114]
In step 5106 (normal mode), it is checked whether or not the movement detection unit 4006 has detected the movement of the pan (the object to be heated 110). If the movement of the pan (the object to be heated 110) is detected, the electric power applied to the induction heating coil 101 is decreased stepwise (may be rapidly decreased) (step 5108). Return to step 5101. In step 5108, for example, the inverter circuit may be stopped, the same control as in the first output fixing mode of the first embodiment may be performed, or the output of the inverter in which the pan does not move is set as the target output in the stable control mode. (Control so that the output of the inverter matches the target output) may be performed.
[0115]
If the movement of the pan (the object to be heated 110) is not detected in step 5106, the power applied to the induction heating coil 101 is changed stepwise and the target power is applied to the induction heating coil 101 (step 5107). ). Return to step 5101. By fixing the output of the inverter circuit 102 with the output fixing input unit 4701 for a predetermined time, even if the user moves and cooks the pan 110 for a predetermined time, the heating output does not decrease. Since the normal mode is restored after a predetermined time has passed, there is no worry that the user forgets to return to the normal mode.
The fixed output input unit 4701 is not limited to a key switch. For example, the output fixed input unit 4701 is a voice recognition unit. The voice recognition unit sends an output fixing mode setting command to the control unit 4004 in accordance with a word (for example, “output fixing ON”) uttered by the user. The control unit 4004 enters the output fixing mode for a predetermined time T0.
[0116]
Example 7
The induction heating apparatus (induction heating cooker) of Example 7 of this invention is demonstrated using FIG. The induction heating apparatus of Example 7 has the same configuration as that of Example 5. In the seventh embodiment, the control unit 4004 fixes the output only while the output fixing key switch (output fixing input unit) 4701 is pressed. As soon as the user releases the output fixing key switch, the movement detection unit 4006 detects the movement of the object to be heated. Therefore, it is safe even when the user leaves the cooking device. In other respects, the induction heating apparatus of the seventh embodiment is the same as the fifth embodiment.
[0117]
FIG. 21 is a flowchart illustrating a method for controlling the induction heating apparatus according to the seventh embodiment. The control method of the induction heating apparatus of Example 7 is demonstrated using FIG. In step 5201, it is checked whether or not the output fixed key switch (output fixed input unit) 4701 is ON. If the output fixing key switch 4701 has been pressed, the process proceeds to step 5202. If not, the process proceeds to step 5203.
In step 5202 (output fixed mode), the control unit 4004 outputs a predetermined control value. The inverter circuit 102 applies predetermined power to the induction heating coil 101. Return to step 5201. In step 5202, the control unit 4004 does not output a predetermined control value, but instead of outputting a predetermined control value, based on the detection output of the output detection unit 103, the control unit 4004 obtains the output of the predetermined inverter circuit 102. (Control to match).
[0118]
In step 5203 (normal mode), it is checked whether or not the movement detection unit 4006 has detected movement of the pan (object to be heated). If the movement of the pan (to-be-heated object) is detected, the power applied to the induction heating coil 101 is lowered stepwise (may be rapidly lowered) (step 5205). Return to step 5201. In step 5205, for example, the inverter circuit may be stopped, the control similar to the first output fixing mode of the first embodiment may be performed, or the output of the inverter in which the pan does not move is set as the target output in the stable control mode. (Control so that the output of the inverter matches the target output) may be performed.
[0119]
In step 5203, if the movement of the pan (object to be heated) is not detected, the power applied to the induction heating coil 101 is changed stepwise and the target power is applied to the induction heating coil 101 (step 5204). . Return to step 5201.
Only when the user is present, since the output fixed mode is set, a safe induction heating device can be realized. By enabling the output fixing key switch 4701 to be stepped on, the user can cook using both hands freely even in the output fixing mode.
[0120]
The fixed output input unit 4701 is not limited to a key switch.
The fixed output input unit 4701 of the seventh embodiment may be replaced with a movement detection stop input unit. When the user continues to input a movement detection stop command from the movement detection stop input unit (for example, when a key switch that is a movement detection stop input unit is continuously pressed, or the proximity sensor (movement detection stop input unit) detects the presence of the user. In the meantime, the movement detection unit stops the movement of the pan or slows down the detection sensitivity, or even if the pan moves, the control unit performs the same operation as the normal operation or an operation close to normal.
[0121]
Example 8
The induction heating apparatus (induction heating cooker) according to the eighth embodiment of the present invention will be described with reference to FIGS. FIG. 22 is a schematic block diagram of the induction heating apparatus of the eighth embodiment. FIG. 23 is a plan view of a principal part of the operation unit 5314 of the induction heating apparatus according to the eighth embodiment. The induction heating apparatus (FIGS. 22 and 23) of the eighth embodiment includes a fixed output setting unit 5302 in addition to the configuration of the fifth embodiment (FIGS. 16 and 17). In other respects, the induction heating apparatus of the eighth embodiment is the same as the fifth embodiment.
[0122]
The fixed output setting unit 5302 adjusts the level of the fixed output in the output fixing mode. As shown in FIG. 23, the fixed output setting unit 5302 includes two key switches (strong and weak). When the weak switch is pressed in the output fixing mode, the control unit 4004 increases the drive frequency of the switching elements 102c and 102d and decreases the output of the inverter circuit 102. When the strong switch is pressed in the output fixing mode, the control unit 4004 increases the drive frequency and decreases the output of the inverter circuit 102. Thereby, since it can adjust a thermal power also in output fixed mode, it becomes easy to cook.
[0123]
FIG. 24 is a flowchart illustrating a method for controlling the induction heating apparatus according to the eighth embodiment. The control method of the induction heating apparatus of Example 8 will be described using FIG. In step 5501, it is checked whether or not the output fixing key switch (output fixing input unit) 4701 has changed from OFF to ON (whether it has been pressed). If output fixed key switch 4701 has been pressed, step 5502 follows. If not, the process proceeds to step 5504.
[0124]
In step 5502, it is checked whether or not it is already in the output fixing mode. If it is already in the fixed output mode, the process proceeds to step 5504. If it is not in the fixed output mode, it is set to the fixed output mode and the weak mode (step 5503).
Next, in step 5504, it is checked whether the up / down or on / off key switch has been changed from OFF to ON (pressed). If any key switch is pressed, the normal mode is set (step 5505). If all the key switches have not been pressed, the process proceeds to step 5506.
Next, in step 5506, it is checked whether or not the current output fixing mode is set. If it is not the current output fixed mode, the process proceeds to step 5507. If the current output is fixed, the process proceeds to step 5510.
[0125]
In step 5510 (output fixing mode), it is checked whether or not the strong key switch of the fixed output setting unit 5302 has changed from OFF to ON (whether it has been pressed). If the strong key switch is pressed, the strong mode is set (step 5511). If not, the process proceeds to step 5512.
In step 5512, it is checked whether or not the weak key switch of the fixed output setting unit 5302 has changed from OFF to ON (whether it has been pressed). If the weak key switch is pressed, the weak mode is set (step 5513). If not, the process proceeds to step 5514.
[0126]
In step 5514, it is checked whether or not the mode is the strong mode. In the strong mode, the control unit 4004 outputs a predetermined large control value. The inverter circuit 102 applies a predetermined large power (strong power) to the induction heating coil 101 (step 5516). The setting display unit 4013 blinks seven LEDs. It returns to step 5501.
If it is determined in step 5514 that the mode is weak, the control unit 4004 outputs a predetermined small control value. The inverter circuit 102 applies predetermined small power (weak power) to the induction heating coil 101 (step 5515). The setting display unit 4013 blinks the four LEDs 1 to 4. It returns to step 5501.
[0127]
In step 5507 (normal mode), it is checked whether or not the movement detection unit 4006 has detected movement of the pan (object to be heated). If the movement of the pan (to-be-heated object) is detected, the control unit 4004 gradually decreases the power applied to the induction heating coil 101 (may be rapidly decreased) (step 5509). It returns to step 5501.
If the movement of the pan (the object to be heated 110) is not detected in step 5507, the control unit 4004 changes the power applied to the induction heating coil 101 stepwise and applies the target power to the induction heating coil 101. (Step 5508). It returns to step 5501.
[0128]
In step 5509, for example, the inverter circuit 102 may be stopped, the same control as the first output fixing mode of the first embodiment may be performed, or the output of the inverter in which the pan does not move is set as the target output and the stable control mode. (Control so that the output of the inverter matches the target output) may be performed.
In the specification, an induction heating apparatus which is an induction heating cooker is described as an example. The induction heating device is not limited to this.
[0129]
【The invention's effect】
According to the present invention, the induction heating apparatus has a safety function for reducing or stopping the heating power when the object to be heated moves, and allows the user to perform cooking even when the safety function is activated. Can be realized.
According to the present invention, when the object to be heated is moved by the high-frequency magnetic field generated by the induction heating coil, it has a safety function of reducing or stopping the thermal power, and in other cases, the safety function does not operate, or It is possible to realize an induction heating device that does not operate and prevents the user's cooking operation from being disturbed by the safety function.
[0130]
According to the present invention, when the object to be heated moves, it has a safety function of reducing or stopping the thermal power, and when the user artificially moves the pot as the object to be heated, the safety function does not work. Alternatively, it is possible to realize an induction heating device that can stably heat an object to be heated even when a safety function is activated (for example, cooking of a fried food or the like is possible).
In this invention, when a user cooks using a lightweight frying pan, or when cooking while shifting a pan, it does not detect pan shift or float or fixes the output of the inverter circuit. Thereby, an average input electric current can be raised, cooking time is shortened and cooking becomes easy. By performing the operation of detecting the panning or lifting of the pan at regular intervals, if the pan is slipping or floating, the pan will stop shifting and floating so that cooking can be performed safely.
[0131]
In the present invention, in the induction heating apparatus having a function of detecting the movement of the load and stopping or suppressing the heating output, even when cooking is performed using a load made of a nonmagnetic and low resistivity metal, the cooking menu is used. Accordingly, the function of detecting the movement of the load (the object to be heated) is stopped or suppressed. As a result, even if the load is artificially moved during cooking, the thermal power does not decrease or stop, or is difficult to occur. An easy-to-use induction heating apparatus that can cook while moving an object to be heated can be realized.
[0132]
Although the invention has been described in its preferred form with a certain degree of detail, the present disclosure of this preferred form should vary in the details of construction, and combinations of elements and changes in order may vary in the claimed invention. It can be realized without departing from the scope and spirit.
INDUSTRIAL APPLICABILITY The present invention is useful as an induction heating device such as an induction heating cooker used in general homes, offices, restaurants, factories and the like.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an induction heating apparatus according to first and second embodiments of the present invention.
FIG. 2 is a specific circuit diagram of the induction heating apparatus according to the first and second embodiments of the present invention.
FIG. 3 is a diagram showing waveforms of each part of the induction heating apparatus according to the first and second embodiments of the present invention.
FIG. 4 is a plan view of an essential part of an operation unit of the induction heating apparatus according to the first and second embodiments of the present invention.
FIG. 5 is a flowchart showing a method for controlling the induction heating apparatus according to the first embodiment of the present invention.
FIG. 6 is a timing chart for explaining the operation of the induction heating apparatus according to the first embodiment of the present invention.
7 is a plan view of the main part of the setting input unit of the induction heating apparatus according to the second embodiment of the present invention. FIG.
FIG. 8 is a flowchart showing a method for controlling the induction heating apparatus according to the second embodiment of the present invention.
FIG. 9 is a block diagram illustrating a configuration of an induction heating apparatus according to a third embodiment of the present invention.
FIG. 10 is a specific circuit diagram of the induction heating apparatus according to the third embodiment of the present invention.
FIG. 11 is a main part plan view of a setting input unit of an induction heating apparatus according to a third embodiment of the present invention.
FIG. 12 is a graph for explaining the operation of the induction heating apparatus according to the third embodiment of the present invention.
FIG. 13 is a flowchart showing a method for controlling the induction heating apparatus according to the third embodiment of the present invention.
FIG. 14 is a block diagram showing a configuration of an induction heating apparatus according to Embodiment 4 of the present invention.
FIG. 15 is a flowchart showing a method for controlling the induction heating apparatus according to the fourth embodiment of the present invention.
FIG. 16 is a block diagram showing a configuration of an induction heating apparatus according to a fifth embodiment of the present invention.
FIG. 17 is a main part plan view of a setting input unit of an induction heating apparatus according to a fifth embodiment of the present invention.
FIG. 18 is a flowchart showing a method for controlling the induction heating apparatus according to the fifth embodiment of the present invention.
FIG. 19 is a block diagram showing the configuration of an induction heating apparatus according to Embodiment 6 of the present invention.
FIG. 20 is a flowchart showing a method for controlling the induction heating apparatus according to the sixth embodiment of the present invention.
FIG. 21 is a flowchart showing a method for controlling the induction heating apparatus according to the seventh embodiment of the present invention.
FIG. 22 is a block diagram showing a configuration of an induction heating apparatus according to an eighth embodiment of the present invention.
FIG. 23 is a plan view of the main part of the setting input unit of the induction heating apparatus according to the eighth embodiment of the present invention.
FIG. 24 is a flowchart showing a method for controlling the induction heating apparatus according to the eighth embodiment of the present invention.
FIG. 25 is a diagram showing the configuration of an induction heating device of Conventional Example 2
FIG. 26 is a block diagram showing a configuration of an induction heating device of Conventional Example 2;
FIG. 27 is a diagram showing the correlation between input power and buoyancy in the induction heating apparatus.
FIG. 28 is a timing chart for explaining the operation of the induction heating device of Conventional Example 2;
FIG. 29 is a timing chart for explaining the operation of the induction heating device of Conventional Example 2;
[Explanation of symbols]
101 Induction heating coil
102 Inverter circuit
103 Output detector
104, 4004 Control unit
105, 4005 Setting input section
106 1st movement detection part
107 1st memory | storage part
108 Rectifier smoothing unit
109 Commercial AC power input
110 Object to be heated
111 Drive circuit
112 Microcomputer
113, 1804, 4013 Setting display section
114, 4014, 4714, 5314 Operation unit
1601, 1801 Heating off / on key switch
1602, 1803 Heating output setting unit
1802 Stir-fried / on key switch
4006 Movement detector
4001 Movement detection stop input section
4502 First timer section
4701 Output fixed input section
5002 Second timer section
5302 Fixed output setting unit

Claims (26)

An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An input unit for setting the heating;
A movement detector for detecting movement of the object to be heated;
A control unit for controlling the output of the inverter circuit, and performing a suppressing operation for stopping or suppressing the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated;
Cooking menu chosen for cooking have you to the input unit, thermal, or series combinations when a preset thermal power in performing automatic cooking, artificially the opportunity object to be heated is moved When there are many settings or when there is a high possibility that the movement detection unit makes a wrong determination , the detection sensitivity of the movement detection unit is dulled or stopped, or the suppression operation of the control unit is weakened. Or induction heating equipment that does not. The input unit includes a heating output setting unit that sets a heating output , and the size of the heating output set by the heating output setting unit is a setting where the object to be heated is frequently moved artificially. Alternatively, when the setting is likely to be erroneously determined by the movement detection unit, the detection sensitivity of the movement detection unit is dulled or stopped, or the suppression operation of the control unit is not weakened or performed. 2. The induction heating apparatus according to 1. An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An input unit for setting the heating;
A movement detector for detecting movement of the object to be heated;
A control unit for controlling the output of the inverter circuit, and performing a suppressing operation for stopping or suppressing the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated;
The input unit includes a heating output setting unit for setting a heating output,
When the set value of the heating output at said heating output setting section becomes equal to or greater than a predetermined value, the detection sensitivity of the movement detection section dull or detection is stopped, or a weakened or perform the suppressing operation of the control unit I誘 Induction heating device. When the movement detection unit detects the movement of the load, if the cooking mode set in the input unit is a setting that gives priority to thermal power, the heating output is continued and the setting is focused on safety against buoyancy. In that case, the induction heating apparatus according to claim 1 , wherein the heating output is switched to stop. An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An input unit for setting the heating;
A movement detector for detecting movement of the object to be heated;
A control unit for controlling the output of the inverter circuit, and performing a suppressing operation for stopping or suppressing the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated;
The input unit includes a heating output setting unit for setting a heating output,
With setting section which the input section other than the heating output setting section is provided, wherein the detection sensitivity of the movement detection section dull or detection is stopped, or a weakened or perform the suppressing operation of the control unit I誘 Induction heating device. An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An input unit for setting the heating;
A movement detector for detecting movement of the object to be heated;
A control unit for controlling the output of the inverter circuit, and performing a suppressing operation for stopping or suppressing the output of the inverter circuit when the movement detection unit detects the movement of the object to be heated;
With change input section provided independently in said input section, said moving dull detection sensitivity of the detecting portion or the detection is stopped, or weaken the suppressing operation of the control unit or performed such I誘 electrically heating device .   The change input unit has a stir-fried food selection unit for performing fried food cooking, and when fried food cooking is selected, the detection sensitivity of the movement detection unit is blunted or stopped, or the control unit The induction heating apparatus according to claim 6, wherein the suppressing operation is not weakened or performed. An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An output detector for detecting the magnitude of the output of the inverter circuit;
A movement detector for detecting movement of the object to be heated;
The output of the inverter circuit is controlled so that the output of the output detection unit becomes a set power or current, and the output of the inverter circuit is stopped when the movement detection unit detects the movement of the object to be heated. Or a control unit that performs a suppression operation to suppress ,
The detection operation of the movement detection unit or the control unit controls the output according to the output of the movement detection unit in order to increase the average power for induction heating the object to be heated that is made of a nonmagnetic and low resistivity metal. A movement detection stop input unit for inputting a stop command for stopping the operation,
Induction heating device with. An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An output detector for detecting the magnitude of the output of the inverter circuit;
A movement detector for detecting movement of the object to be heated;
The output of the inverter circuit is controlled so that the output of the output detection unit becomes a set power or current, and the output of the inverter circuit is stopped when the movement detection unit detects the movement of the object to be heated. Or a control unit that performs a suppression operation to suppress,
A movement detection stop input unit for inputting a stop command to stop the detection operation of the movement detection unit or the control unit to control the output according to the output of the movement detection unit;
A first timer unit that starts timing in connection with an input operation to the movement detection stop input unit, and until the predetermined time elapses after the first timer unit starts timing, the object to be heated is moved whether the output is set power or current row cormorants induction heating apparatus controlled so that the inverter circuit regardless of the. An induction heating coil that generates a high-frequency magnetic field and heats an object to be heated;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
An output detector for detecting the magnitude of the output of the inverter circuit;
A movement detector for detecting movement of the object to be heated;
The output of the inverter circuit is controlled so that the output of the output detection unit becomes a set power or current, and the output of the inverter circuit is stopped when the movement detection unit detects the movement of the object to be heated. Or a control unit that performs a suppression operation to suppress ,
An output fixing input unit for inputting an output fixing command,
An induction heating apparatus in which, when the output fixing command is input, the control unit fixes the output of the inverter circuit regardless of whether or not the object to be heated has moved. A second timer unit that starts timing in relation to the input of the output fixing command to the output fixing input unit, and when the time measured by the second timer unit exceeds a predetermined time, the control unit The induction heating device according to claim 10, wherein the fixing of the output of the inverter circuit is released.   The induction heating apparatus according to claim 10, wherein the control unit fixes the output of the inverter circuit only while the output fixing input unit inputs an output fixing command.   The induction heating apparatus according to any one of claims 10 to 12, further comprising a fixed output setting unit that adjusts an output of an inverter circuit fixed by the output fixed input unit. An inverter having a heating coil for induction heating a load made of a non-magnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit And a load movement detection means having a function of detecting a floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil. cooking menu chosen for cooking have you to, thermal, or series combinations when a preset thermal power in performing automatic cooking, by artificially the many opportunities that the object to be heated is moved set An induction heating cooker configured to suppress or invalidate the function of the load movement detection means when there is a setting or the load movement detection means is likely to be erroneously determined . The input unit includes a heating output setting means for setting a heating output, and when the setting value in the heating output setting means is a setting in which the object to be heated is often moved artificially or when the load is detected The induction heating cooker according to claim 14, wherein the function of the load movement detecting means is suppressed or invalidated when the setting is likely to be erroneously determined by the means. An inverter having a heating coil for induction heating a load made of a non-magnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit And a load movement detection means having a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil. parts are provided with a heating output setting means for setting the heating output, the a setting of the heating output of the heating output setting section becomes equal to or greater than the predetermined value, the load transfer inhibiting the function of detecting means or disabled to that induction cooking vessel. When the cooking mode set in the input unit is a setting that prioritizes thermal power , the load movement detection means continues the heating output after detecting lift or movement of the load, and places importance on safety against buoyancy. in some cases, the induction heating cooker according to claim 14 or 15 has a configuration to switch to stop the heating output. An inverter having a heating coil for induction heating a load made of a non-magnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit And a load movement detection means having a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil. parts are provided with a heating output setting means for setting the heating output, induction with using setting means comprises an input portion other than the heating output setting means and allow for repression or disable the function of the load movement detection means Cooker. An inverter having a heating coil for induction heating a load made of a nonmagnetic and low resistivity metal, an input unit for setting, and a heating output control for controlling the heating output of the heating coil according to the setting of the input unit And a load movement detecting means having a function of detecting the floating or movement of the load and outputting a control signal to the heating output control means to stop or suppress the heating output of the heating coil, induction heating cooker which enables suppression or disable the function of the load movement detection means using a modified input section provided independently in.   The induction heating cooker according to claim 19, wherein the change input unit has a fried food cooking selection means for performing fried food cooking, and when the fried food cooking is selected, the function of the load movement detection means is suppressed or invalidated. An induction heating coil that generates a high-frequency magnetic field and heats the object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, output detection means that detects the magnitude of the output of the inverter circuit, and the object to be heated A movement detecting means for detecting a shift or a lift of the output, and controlling the output of the inverter circuit so that the output of the output detecting means becomes a set power or current, and the movement detecting means detects the movement of the object to be heated. An induction heating apparatus comprising control means for performing a suppression operation to stop or suppress the output of the inverter circuit when detected, and a movement detection stop input means configured by a key switch to stop the movement detection means.   The induction heating apparatus according to claim 21, further comprising: a first timer unit that starts timing by a movement detection stop input unit, and the movement detection unit starts an operation after a predetermined time has elapsed. An induction heating coil that generates a high-frequency magnetic field and heats the object to be heated, an inverter circuit that supplies a high-frequency current to the induction heating coil, output detection means that detects the magnitude of the output of the inverter circuit, and the object to be heated A movement detecting means for detecting a shift or a lift of the output, and controlling the output of the inverter circuit so that the output of the output detecting means becomes a set power or current, and the movement detecting means detects the movement of the object to be heated. Control means for performing a suppression operation to stop or suppress the output of the inverter circuit when detected, and a control value before the movement detecting means detects the movement of the object to be heated, and the stored control value An induction heating apparatus provided with output fixing input means for fixing the control value controlled by the control means based on the above in a range in which the object to be heated does not move .   24. The induction heating apparatus according to claim 23, further comprising second timer means for starting timing by the fixed output input means, wherein the control means releases the fixed output after a predetermined time has elapsed.   The induction heating apparatus according to claim 23, wherein the control means fixes the output only while a key switch constituting the output fixing input means is being pressed.   The induction heating device according to any one of claims 23 to 25, further comprising a fixed output setting unit that adjusts an output of the inverter fixed by the output fixing unit.

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