JP6549346B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker.

  Many heating cookers such as gas stoves use dry batteries as the main power source. For example, in the technology of Patent Document 1, the constant voltage VR2 is generated by the power supply circuit 20 that receives power supply from the batteries, and the microcomputer 16 etc. The drive power is supplied to various parts of the

JP-A-6-337115

  However, in the conventional example such as Patent Document 1, since only the power supply voltage VR2 generated by the power supply circuit 20 is used as the operating voltage of the drive system such as the microcomputer 16 or the solenoid valve drive circuit 19, the output from the power supply circuit 20 is There is a problem that the operation of the drive system can be maintained only while the voltage VR2 exceeds a certain level. That is, even if the output voltage of the battery serving as the main power supply exceeds the above-mentioned constant level, driving is possible unless an operating voltage exceeding the above-mentioned constant level (level capable of operating the drive system) can not be stably generated by the power supply circuit 20. The system can not be operated normally. In such a configuration, when the output voltage from the power supply circuit 20 does not exceed a certain level, battery replacement must be performed even if the output voltage at the battery is at a certain level, so the battery life is shortened. The battery replacement cycle has to be quick.

  The present invention has been made to solve the above-described problems, and provides a heating cooker that uses a battery as a main power source, and can provide a configuration that allows the drive system to operate normally while extending the battery life. With the goal.

The present invention
Battery,
A main power path connected to the battery;
A load to which a drive current from the main power path is supplied, and a drive target load including at least one of a motor and a solenoid valve that drives a valve that adjusts a gas supply amount to a gas burner;
A first conduction path connected to the main power path and serving as a conduction path between the main power path and the drive target load;
A second conduction path that is configured as an conduction path different from the first conduction path, and is a conduction path between the main power path and the drive target load;
A step-down circuit provided in the second current path, which steps down and outputs an input voltage from the main power path side;
A booster circuit for outputting a boosted voltage based on the voltage from the battery;
A first switch for switching the first conductive path between a conductive state and a non-conductive state;
A second switch for switching the second conductive path between a conductive state and a non-conductive state;
A voltage detection unit that detects the voltage of the battery;
When the voltage of the battery detected by the voltage detection unit is equal to or higher than a predetermined threshold, the second current path is switched by switching the first switch to the non-conductive state and switching the second switch to the conductive state. The drive current according to the output voltage from the step-down circuit is supplied to the drive target load via the step-down circuit, and the voltage of the battery detected by the voltage detector becomes a predetermined low voltage state below the threshold. In this case, by switching the first switch to the conductive state and switching the second switch to the nonconductive state, drive current from the main power path to the drive target load through the first current path. A control unit that performs supply control and operates based on the output of the booster circuit ;
It is characterized by having.

In the invention of claim 1, when the voltage of the battery detected by the voltage detection unit is equal to or higher than a predetermined threshold value, the second switch is switched to the non-conductive state and the second switch is switched to the conductive state. When a drive current corresponding to the output voltage from the step-down circuit is supplied to the drive target load via the current path, and the battery voltage detected by the voltage detection unit becomes a predetermined low voltage state where the voltage is less than the threshold. The control unit causes the drive current from the main power path to be supplied to the drive target load via the first conduction path by switching the first switch to the conduction state and switching the second switch to the non-conduction state. Control is made.
In this configuration, when the battery voltage is relatively high and it is easy to maintain the output voltage from the step-down circuit high, the drive target load is operated with the drive voltage (output voltage from the step-down circuit) suppressed lower than the battery voltage. This makes it easy to operate the load to be driven stably while suppressing the power consumption. On the other hand, in this configuration, when the battery voltage becomes relatively low and it becomes difficult to maintain the output voltage from the step-down circuit high, the drive current from the main power path is not driven via the step-down circuit. Even when the battery voltage drops to some extent, the battery can be used while the voltage applied to the drive target load is maintained at a level capable of driving the drive target load. Such a feature makes it possible to operate the drive system normally while extending the battery life in the heating cooker which uses the battery as the main power supply.

In the invention of claim 2, when the control unit switches the first switch to the on state and switches the second switch to the off state, the voltage of the battery detected by the voltage detection unit thereafter becomes equal to or higher than the threshold value. Even in this case, the control to switch the first switch to the conductive state and to switch the second switch to the nonconductive state is continued.
According to this configuration, it is possible to avoid frequent switching of switches when the battery voltage fluctuates near the threshold.

The invention according to claim 3 comprises a plurality of gas burners, a common gas supply path serving as a source of gas supply to the plurality of gas burners, and a branch path branched from the common gas supply path and continuing to each gas burner, The step-down circuit and the drive target load to which the drive current is supplied from the main power path include a motor provided in the branch path and setting the opening degree of the branch path in accordance with the rotation angle of the drive shaft.
The invention of claim 4 comprises a plurality of gas burners, a common gas supply passage serving as a source of gas supply to the plurality of gas burners, and a plurality of branch passages branched from the common gas supply passage and continuing to the respective gas burners. A plurality of motors which are respectively provided in a plurality of branch paths as drive target loads to which drive current is supplied from the step-down circuit and the main power path, and which set the opening degree of the branch paths according to the rotation angle of the drive shaft. And a source solenoid valve disposed in at least a common gas supply path and switching the opening and closing of the common gas supply path.
As described above, a configuration in which a plurality of motors and a source solenoid valve are provided is likely to consume a large amount of power and has a more problem in battery life. Therefore, if the features of the present invention are applied to such a configuration It is useful. In addition, in this configuration, when the battery voltage becomes relatively low, it is possible to simultaneously switch the supply sources of the drive voltages to the plurality of motors and the original solenoid valve, and stabilize all these driving units while extending the battery life. It is possible to realize a configuration that can be operated in a simple manner without complicated configuration and control.

FIG. 1 is a perspective view schematically illustrating a heating cooker according to a first embodiment. FIG. 2: is explanatory drawing which shows notionally the gas supply path etc. to each gas burner in the heating cooker of FIG. FIG. 3 is a block diagram schematically illustrating the electrical configuration of the heating cooker of FIG. FIG. 4 is a circuit diagram schematically illustrating a power supply circuit and the like used in the heating cooker of FIG.

First Embodiment
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
(Whole composition of the heating cooker)
The heating cooker 1 shown in FIG. 1 is comprised as a built-in stove which can heat cooking utensils, such as a cooking pot. The heating cooker 1 is provided with a right hinge 4a and a left hinge 4b respectively so as to be exposed from the top plate 2 (top plate) constituting the upper surface of the heating cooker body 1a. A small concave portion 4c is provided on the rear side between the concave portions 4a and 4b. And below the top plate 2, the grill 3 is provided in the internal center vicinity of the heating cooker main body 1a. The grill 3 is provided with a grill storage (not shown) that accommodates the food to be cooked and cooks with the grill burner (gas burner 54: FIG. 2). This grill storage is located on the front of the heating cooker body 1a. It can be opened and closed by the provided grille door 3b.

  Gas burners 51, 52, 53, and 54 shown in FIG. 2 are respectively provided on the right hourglass 4a, the left angler 4b, the small edge 4c, and the grill 3 shown in FIG. The gas supply path includes a common supply path 60 (hereinafter, also referred to as a gas supply path 60) serving as a common gas path to the plurality of gas burners 51, 52, 53, 54, and each gas burner 51 from the common supply path 60. , 52, 53, 54 are respectively provided with a plurality of branch supply paths (hereinafter also referred to as branches) 61, 62, 63, 64. The common supply passage 60 is provided with a source solenoid valve N1 for opening and closing the common supply passage, and each branch supply passage 61, 62, 63, 64 is provided with a thermal power adjustment valve and an on-off valve. ing.

  As shown in FIG. 2, for example, in the branch supply passage 61 to the gas burner 51, a safety valve 51g which can open and close the branch supply passage 61, a shutoff valve 51f which can open and close the branch supply passage 61, and a gas to the gas burner 51. A thermal power control valve 51e capable of adjusting the supply amount is provided. The safety valve 51g, the shutoff valve 51f, and the thermal power adjustment valve 51e are driven by the stepping motor M1 shown in FIG. 3, and when the rotation angle of the stepping motor M1 becomes the first angle range, the safety valve 51g When the rotation angle of the motor M1 is in the second angle range, the shutoff valve 51f is opened. When the rotation angle of the stepping motor M1 is in the third angle range, the heating power adjustment valve 51e is opened according to the rotation angle. The degree is set. That is, by controlling the rotation angle of the stepping motor M1, it is possible to control the opening and closing of the safety valve 51g and the closing valve 51f, and the opening degree of the thermal power adjustment valve 51e.

  Further, as shown in FIG. 2, the branch supply passage 62 to the gas burner 52 is also provided with a safety valve 52g similar to the branch supply passage 61, a shutoff valve 52f, and a heating power control valve 52e. Also, a safety valve 53g similar to the branch supply passage 61, a closing valve 53f, and a heating power control valve 53e are provided. The control of the safety valve 52g, the closing valve 52f, and the thermal power control valve 52e in the branch supply passage 62 is the same as that of the branch supply passage 61, and the safety valve 52g is controlled by controlling the rotation angle of the stepping motor M2 (FIG. 3). The opening and closing of the shutoff valve 52f and the opening degree of the heating power control valve 52e can be controlled. Further, the control of the safety valve 53g, the shutoff valve 53f, and the thermal power adjustment valve 53e in the branch supply passage 63 is the same as that of the branch supply passage 61, and the safety valve 53g is controlled by controlling the rotation angle of the stepping motor M3 (FIG. 3). The opening and closing of the shutoff valve 53f and the opening degree of the heating power control valve 53e can be controlled.

  Further, as shown in FIG. 2, the branch supply passage 64 to the gas burner 54 of the grill 3 has a safety valve 54f capable of opening and closing the branch supply passage 64 and a thermal power adjustment valve 54e capable of adjusting the gas supply amount to the gas burner 54. And are provided. The safety valve 54f and the thermal power adjustment valve 54e are driven by the stepping motor M4 shown in FIG. 3, and the safety valve 54f is opened when the rotation angle of the stepping motor M4 becomes a first predetermined angle range. When the rotation angle of the stepping motor M4 falls within the second predetermined angle range, the opening degree of the thermal power adjustment valve 54e is set in accordance with the rotation angle. In the example of FIG. 2, although the thermal power adjustment valve 54e which opens and closes by control of the stepping motor M4 was illustrated, it replaces with the thermal power adjustment valve 54e, The solenoid valve which opens and closes the supply path 65b to the lower burner 54b, An upper burner An electromagnetic valve may be provided to open and close the supply path 65a to 54a, and the opening and closing of these electromagnetic valves may be controlled by a drive source different from the stepping motor M4. In this case, a bypass passage parallel to the supply passage 65a is provided to bypass the solenoid valve of the supply passage 65a to the upper burner 54a, and the gas is supplied to the upper burner 54a by the bypass passage when the solenoid valve of the supply passage 65a is closed. The power of the upper burner 54a may be adjusted so that the gas is supplied to the upper burner 54a by both the supply passage 65a and the bypass passage when the supply and the solenoid valve of the supply passage 65a are open. The same applies to the lower burner 54b side, and a bypass passage parallel to the supply passage 65b is provided to bypass the solenoid valve of the supply passage 65b to the lower burner 54b, and when the solenoid valve of the supply passage 65b is closed The power of the lower burner 54b may be adjusted so that the gas is supplied to the lower burner 54b and the gas is supplied to the lower burner 54b by both the supply passage 65b and the bypass when the solenoid valve of the supply passage 65b is open. . In addition, the source solenoid valve N1 is configured as, for example, a known solenoid valve, and can be switched between the open state and the closed state according to a control signal from the microcomputer 10.

  Further, in this configuration, as shown in FIG. 3, motor drive circuits 41 to 44 for driving the motors M1 to M4 are provided. Each of these motor drive circuits 41 to 44 is adapted to be applied with a drive voltage V3 generated by a power supply circuit 14 to be described later. Operate to drive. Further, a solenoid valve drive circuit 45 for driving the original solenoid valve N1 is provided, and the drive voltage V3 generated by the power supply circuit 14 described later is also applied to the solenoid valve drive circuit 45. The source solenoid valve N1 is driven to open in response to the opening instruction signal from 10, and the source solenoid valve N1 is driven to close in response to the closing instruction signal from the microcomputer 10. In the present configuration, the stepping motors M1 to M4, the source solenoid valve N1, and the drive circuits 41 to 45 for driving them correspond to an example of the drive target load.

  Further, four rotation operation units 6 are provided to correspond to the right hinge 4a, the left hinge 4b, the small hinge 4c, and the grille 3, respectively. The first rotation operation unit 6a, the second rotation operation unit 6b, and the third rotation operation unit 6c are provided so as to be exposed from the right front panel 7a. The rotary operation unit 6a corresponding to the right hinge 4a is on the right side, and the rotation operation unit 6b corresponding to the left tongue 6b is on the left, so as to match the actual positional relationship with the respective hinges. A rotation operation unit 6c corresponding to the recess 4c is disposed between the rotation operation units 6a and 6b. Further, a fourth rotation operation unit 6d corresponding to the grill 3 is provided so as to be exposed from the left front panel 7b.

  The first rotation operation unit 6a is for performing ignition, extinguishment, and thermal power adjustment of the right corner 4a, and is configured to be capable of pressing operation and configured to be capable of rotating operation. For example, at the time of fire extinguishing, as shown by the solid line in FIG. 1, the front surface portion of the cylindrical rotational operation portion 6a is retracted rearward. Then, by pressing the front surface in this state, the right hinge 4a is ignited, and as indicated by the two-dot chain line 6 ', the rotation operation unit 6a is positioned so that the front surface is in front of the extinguisher. It is supposed to protrude. Further, by rotating the rotation operation portion 6a in one rotation direction in such a projecting state, the power of the corresponding right corner 4a can be increased, and conversely, the rotation operation portion 6a is not By rotating in the direction of rotation, it is possible to reduce the power of the corresponding right hinge 4a. When the front surface portion is pressed in the projecting state shown by the two-dot chain line 6 ', the retracted state shown by the solid line is restored, and at this time the extinguishing of the right hook 4a is performed.

  The rotation control unit 6b performs ignition, extinguishment and power adjustment of the left corner 4b, the rotation control unit 6c performs ignition, extinguishment and power adjustment of the small recess 4c, and the rotation control unit 6d Ignition, fire extinguishing and thermal power adjustment of the grill 3 are performed. The basic structure and function are the same as those of the rotation operation unit 6a except that they are different in the object. Also, switch units 30a, 30b, 30c, 3d are provided to correspond to the rotation operation units 6a, 6b, 6c, 6d, respectively. The switch units 30 give an off signal to the microcomputer 10 when the corresponding rotation operation unit 6 is at the retracted position (fire extinguishing position), and when the corresponding rotation operation unit 6 is at the projection position (ignition position) Are configured to give an on signal.

(Configuration of power supply circuit)
Next, the configuration of the power supply circuit will be described with reference to FIG. Although only the drive circuit 41 of the plurality of drive circuits 41 to 45 is shown in FIG. 4 and the circuit configuration is schematically shown, actually, as shown in FIG. 3, the voltage generated by the power supply circuit 14 V3 is supplied to any of the drive circuits 41-45.

  In the present configuration, a battery 12 composed of a dry battery or the like is provided as a main power source. Then, the main power path La is connected to the positive electrode of the battery 12, the negative electrode of the battery 12 is connected to the ground, and the booster circuit 22 of the power supply circuit 14 is connected to the main power path La. It is done. The booster circuit 22 is configured by a known booster circuit, and boosts the output voltage V1 from the battery 12 to a voltage V2 higher than this, and supplies the output voltage V2 as an operating power source of the microcomputer 10, for example. ing. That is, the power supply potential input to the microcomputer 10 is higher than the potential of the positive electrode of the battery 12.

  Further, in the main power path La connected to the battery 12, the switch SW1 and the switch SW2 are connected in parallel. Specifically, the two conductive paths (the first current path L1 and the second current path L2) branch from the main power path La starting from the connection portion A1. And switch SW1 is arrange | positioned so that the 1st electricity supply path L1 (1st path | route between the connection part A1 and the connection part A2) may be switched to an energized state and a non-energized state. The first conduction path L1 is connected between the main power path La and the power supply line Lb, and is a portion serving as a conduction path between the main power path La and the drive target load. Further, the switch SW2 is arranged to switch the second conduction path L2 (a second path between the connection portion A1 and the connection portion A2) between the conduction state and the non-conduction state. The second conduction path L2 is configured as an conduction path different from the first conduction path L1 between the main power path La and the power supply line Lb, and is a portion serving as a conduction path between the main power path La and the load to be driven. is there. The power supply line Lb is a portion disposed downstream of the switch SW1 (low potential side) and downstream of the step-down circuit 18 (step-down voltage output side). The power supply voltage L3 supplied to the drive circuits 41 to 45 is Is the conductive path to be applied.

  The switches SW1 and SW2 are configured as, for example, P-channel type MOSFETs, and in the example of FIG. 4, the gates of the switches SW1 and SW2 are respectively connected to the terminals of the microcomputer, and the sources are main power paths Connected to La. The source of the switch SW1 is connected to the power supply line Lb, and the source of the switch SW2 is connected to the step-down circuit 18. An H level signal or an L level signal is output from each terminal provided in the microcomputer 10 to each gate. For example, the switch SW1 is turned on when the on signal is given from the microcomputer 10 to the gate, and during the on operation, the first current path L1 is turned on so that the main power path La and the power supply line Lb are conducted. Is turned on. Similarly, the switch SW2 is turned on when the on signal is given from the microcomputer 10 to the gate, and during the on operation, the second power line is turned on so as to electrically connect the main power path La and the power supply line Lb. Electrical path L2 is brought into conduction.

  The step-down circuit 18 is configured as a known step-down circuit using the coil L, the diode D, and the switching control unit 18a, and the second current path L2 (specifically, between the switch SW2 and the connection portion A2) , And is configured to step down an input voltage applied through the main power path La to a potential lower than the potential of the main power path La and output the same. Specifically, when the switch SW2 is in the on state, the input voltage on the drain side of the switch SW2 is stepped down, and an output voltage of a predetermined potential (for example, 2.2 V) is applied to the power supply line Lb. . The step-down circuit 18 shown in FIG. 4 is merely an example, and various configurations can be applied as long as it is a known step-down circuit that can step down the voltage on the drain side of the switch SW2 as the input voltage.

  In this configuration, the power supply circuit 14 operates when the power switch (not shown in FIG. 4) is turned on, and is controlled by the microcomputer 10, and immediately after the power switch is turned on (power on Immediately after), for example, the switch SW2 is turned on and the switch SW1 is turned off. Further, the microcomputer 10 functions as a voltage detection unit that detects the voltage of the battery 12, and is configured to continuously detect the battery voltage immediately after the power switch is turned on (immediately after the power is turned on). Furthermore, the microcomputer 10 functions as a control unit, determines whether or not the voltage V1 of the battery 12 is equal to or higher than a predetermined threshold (for example, 2.8 V), and the voltage V1 of the battery 12 is equal to or higher than the predetermined threshold The drive current corresponding to the output voltage from the step-down circuit 18 is switched through the second conduction path L2 by switching the first switch SW1 to the non-conductive state and switching the second switch SW2 to the conductive state. Supply to the driven load. That is, when the voltage V1 of the battery 12 is equal to or higher than the predetermined threshold value, the first switch SW1 is turned off and the second switch is turned on. Therefore, the same voltage as the output voltage V1 from the battery 12 is the step-down circuit The voltage of a predetermined potential (for example, 2.2 V), which is input to 18 and reduced, is output to the power supply line Lb. In this case, the output voltage from the step-down circuit 18 is the supply voltage V3 to the drive circuits 41 to 45 for driving the motors M1 to M4 and the original solenoid valve N1, and the drive current generated based on the supply voltage V3 is each It will be supplied to the load to be driven. Note that the battery voltage detection method by the microcomputer 10 may directly detect the battery voltage V1 by a known voltage detection method, and the battery voltage is indirectly measured by detecting the voltage V2 boosted by the booster circuit 22. It may be grasped (in this case, it may be determined whether or not the voltage V1 is equal to or more than a predetermined threshold by judging whether the voltage V2 is equal to or more than a certain threshold). In addition, a threshold (for example, a value of 2.8 V) for determining the voltage V1 of the battery 12 may be stored in a memory (not shown), and is for switching between the first switch SW1 and the second switch SW2. A threshold may be written in a program (a program executed by the microcomputer 10), and the program may be stored in a memory (not shown).

  On the other hand, the microcomputer 10 switches the first switch SW1 to the conductive state and the second switch SW2 to the nonconductive state when the voltage V1 of the battery 12 becomes a low voltage state where it is less than a predetermined threshold (for example 2.8V). The drive current from the main power path La side is supplied to the drive target load via the first current path L1. That is, when the voltage V1 of the battery 12 is less than the predetermined threshold, the first switch SW1 is turned on and the second switch is turned off, so the main power path La and the power supply line Lb are connected via the switch SW1. It conducts. Therefore, a voltage of about the same level as the output voltage V1 from the battery 12 is applied to the power supply line Lb, and becomes the supply voltage V3 to the drive circuits 41 to 45 driving the motors M1 to M4 and the original solenoid valve N1. Then, a drive current generated based on the supply voltage V3 is supplied to each drive target load.

  In this configuration, when the voltage of battery 12 is relatively high and it is easy to maintain the output voltage from step-down circuit 18 high, the drive voltage (output voltage from step-down circuit 18) suppressed lower than the voltage of battery 12 Since the drive target load is operated by this, it becomes easy to stably operate the drive target load while suppressing the power consumption. On the other hand, when the voltage of battery 12 becomes relatively low and it becomes difficult to maintain the output voltage from step-down circuit 18 high, the drive current from main power path La is driven without passing through step-down circuit 18 In order to switch to supply the load, even when the voltage of the battery 12 is lowered to some extent, the battery 12 is used while the voltage V3 applied to the driven load is maintained at a level capable of driving the driven load. be able to. With such a feature, in the heating cooker 1 using the battery 12 as a main power source, it is possible to extend the life of the battery 12 and operate the drive system normally.

  Further, in the present configuration, when the microcomputer 10 corresponding to the control unit temporarily switches the first switch SW1 to the conductive state and switches the second switch SW2 to the nonconductive state due to a drop in the voltage of the battery 12, then Even when the voltage of the battery 12 becomes equal to or higher than the threshold value, control to switch the first switch SW1 to the conductive state and to switch the second switch SW2 to the nonconductive state is continued. According to this configuration, it is possible to avoid frequent switching of the switch when the voltage of the battery 12 fluctuates near the threshold.

  In addition, as shown in FIG. 2, the heating cooker 1 according to the present configuration is common to a plurality of gas burners 51, 52, 53 and 54 and a plurality of gas burners 51, 52, 53 and 54 as sources of gas supply. A gas supply passage 60 and a plurality of branch passages 61, 62, 63, 64 which are branched from the common gas supply passage 60 and continue to the respective gas burners 51, 52, 53, 54 are provided. The driving load is supplied from the step-down circuit 18 and the main power path La to the plurality of branch paths 61, 62, 63, 64, respectively, and the branch path 61 is provided according to the rotation angle of the drive shaft. , 62, 63, 64 common to the plurality of motors M1, M2, M3, M4 for setting the opening degrees (specifically, the opening degrees of the thermal power adjustment valves 51e, 52e, 53e, 54e) A source solenoid valve N1 disposed in the passage 60 and switching the opening and closing of the common gas supply passage 60 is provided. Thus, the configuration in which the plurality of motors M1, M2, M3, M4 and the main solenoid valve N1 are provided is likely to consume a large amount of power, and the life of the battery 12 becomes more problematic. It is even more useful if the features of the present invention are applied. Further, in this configuration, when the voltage of the battery 12 becomes relatively low, the supply sources of the drive voltage to the plurality of motors M1, M2, M3, M4 and the original solenoid valve N1 can be simultaneously switched. A configuration capable of stably operating all these drive parts while extending the life of 12 can be realized without involving complicated configuration and control.

  Further, in the configuration provided with the plurality of gas burners 51, 52, 53, 54 as in this configuration, the plurality of drive sources (the plurality of motors M1, M2, M3, M4 and the original solenoid valve N1) operate at the same time It is also assumed that short-term voltage fluctuations due to multiple drive sources operating at the same time. In such a configuration, it is assumed that the battery voltage V1 suddenly drops to a level at which stable supply can not be performed by the step-down circuit 18, and in such a method that determines battery lifetime when the voltage decreases, It becomes difficult to use for a long time. On the other hand, in this configuration, even if the battery voltage suddenly drops below a predetermined threshold (for example, 2.8 V), the battery can be used while being maintained at a low level to some extent. The configuration is also advantageous for sudden voltage fluctuations. The microcomputer 10 prohibits the operation of the drive target load described above (for example, when the battery voltage V1 falls below a second threshold (for example 2.3 V) lower than the predetermined threshold (for example 2.8 V) (for example, It is preferable to turn off the switches SW1 and SW2, to stop the supply of the operating voltage V3 to the load to be driven, and to prohibit the use of the apparatus itself. In this case, when the battery voltage V1 is less than the second threshold value, it is preferable to perform a notification operation (for example, generation of a buzzer sound) or display of an error code on the display unit.

1 ... heating cooker 10 ... microcomputer (control unit, voltage detection unit)
12: Battery 18: Step-down circuit 51, 52, 53, 54: Gas burner 60: Common gas supply path 61, 62, 63, 64: Branch path La: Main electric power path L1: First electric path L1: Second electric path M1, M2, M3, M4 ... Motors (load to be driven)
N1 ... Solenoid valve (load to be driven)
N1 ... source solenoid valve (load to be driven)
SW1 ... first switch SW2 ... second switch

Claims (4)

Battery,
A main power path connected to the battery;
A load to which a drive current from the main power path is supplied, and a drive target load including at least one of a motor and a solenoid valve that drives a valve that adjusts a gas supply amount to a gas burner;
A first conduction path connected to the main power path and serving as a conduction path between the main power path and the drive target load;
A second conduction path that is configured as an conduction path different from the first conduction path, and is a conduction path between the main power path and the drive target load;
A step-down circuit provided in the second current path, which steps down and outputs an input voltage from the main power path side;
A booster circuit for outputting a boosted voltage based on the voltage from the battery;
A first switch for switching the first conductive path between a conductive state and a non-conductive state;
A second switch for switching the second conductive path between a conductive state and a non-conductive state;
A voltage detection unit that detects the voltage of the battery;
When the voltage of the battery detected by the voltage detection unit is equal to or higher than a predetermined threshold, the second current path is switched by switching the first switch to the non-conductive state and switching the second switch to the conductive state. The drive current according to the output voltage from the step-down circuit is supplied to the drive target load via the step-down circuit, and the voltage of the battery detected by the voltage detector becomes a predetermined low voltage state below the threshold. In this case, by switching the first switch to the conductive state and switching the second switch to the nonconductive state, drive current from the main power path to the drive target load through the first current path. A control unit that performs supply control and operates based on the output of the booster circuit ;
A heating cooker characterized by having.   When the control unit switches the first switch to the conductive state and switches the second switch to the non-conductive state, the voltage of the battery detected by the voltage detection unit thereafter becomes equal to or higher than the threshold value The heating cooker according to claim 1, wherein control to switch the first switch to the conductive state and to switch the second switch to the nonconductive state is continued. And the plurality of gas burners,
A common gas supply path serving as a source of gas supply to the plurality of gas burners;
A branch that branches from the common gas supply path and continues to each gas burner;
Equipped with
The step-down circuit and the drive target load to which drive current is supplied from the main electric power path include a motor provided in the branch path and setting the opening degree of the branch path according to the rotation angle of the drive shaft. The heating cooker according to claim 1 or 2, characterized by the above. And the plurality of gas burners,
A common gas supply path serving as a source of gas supply to the plurality of gas burners;
A plurality of branch paths branched from the common gas supply path and continuing to each gas burner;
Equipped with
As the drive target load to which drive current is supplied from the step-down circuit and the main power path,
A plurality of motors provided respectively in the plurality of branch paths and setting the opening degree of the branch path according to the rotation angle of the drive shaft;
A source solenoid valve disposed in at least the common gas supply passage and switching the opening and closing of the common gas supply passage;
The cooking device according to claim 1 or 2, further comprising:

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