JP3791508B2 - Electric rice cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to a configuration of an electromagnetic induction heating type electric rice cooker provided with a plurality of work coils.
[Prior art]
[0003]
Conventionally, in this type of electric rice cooker, when driving the plurality of work coils, for example, the first work coil on the bottom side of the rice cooker and the second work coil on the rice cooker lid side, the duty ratio is determined. / T (seconds) count of T seconds (cycle T seconds is arbitrary) Both the first and second work coils are turned ON at the first timing, and turned OFF corresponding to the elapse of n seconds set according to the menu. ON / OFF control pattern was adopted.
[0004]
However, in the case of such a configuration, the first and second sets of work coils are energized at the same time, and the second work coils are all in the ON period n of the first work coil. And duplicated. For this reason, the magnetic field between the two work coils interferes and the beat increases. On the other hand, when setting the outputs of the first and second work coils, the allowable maximum power consumption 1400 (W ), The output value of each work coil must be appropriately distributed and set, and the output of each work coil could not be sufficiently increased.
[0005]
Therefore, in order to solve such a problem, for example, there is one in which the plurality of work coils as described above are individually operated by switching between the ON and OFF states so that at least the ON timings do not overlap ( For example, see Patent Document 1).
[0006]
In the case of this configuration, for example, when the work coils are in the first and second sets, the ON / OFF pattern as shown in FIG. 9 is obtained, and in the case of the first, second and third sets, the work coil shown in FIG. The ON / OFF pattern becomes like this.
[0007]
With such a configuration, since the ON periods of the first, second, first, second, and third work coils do not overlap with each other, it is possible to reliably prevent noise due to interference of magnetic fields between the work coils. At the same time, the output value of each work coil can be increased to an allowable maximum power of 1400 (W).
[0008]
[Patent Document 1]
JP-A-8-196417 (refer to pages 2 to 6 and FIGS. 1 to 6)
[Problems to be solved by the invention]
[0009]
However, in the configuration in which the operation timing is completely switched so that the ON timings of the plurality of work coils do not overlap with each other as described above, the heating output of any of the work coils within a certain period T is achieved. (If the above-mentioned duty ratio: n / T) is increased, the heating output (duty ratio: n / T) of the other work coil decreases accordingly, and the heating output between each work coil is balanced. Is difficult.
[0010]
In particular, there is a drawback that it is not possible to increase the total heating output obtained by synergizing the heating outputs of the respective work coils, so that it is impossible to realize a product having sufficient heating performance. This problem becomes more pronounced as the number of work coils increases in the case of three sets of work coils (FIG. 10) than in the case of two sets of work coils (FIG. 9).
[0011]
The present invention has been made to solve such a problem. In the case where a plurality of work coils are provided as described above, the present invention is possible while preventing interference of magnetic fields between the work coils as much as possible. An object of the present invention is to provide an electric rice cooker capable of obtaining a high output as much as possible.
[Means for Solving the Problems]
[0012]
In order to achieve the same object, the present invention is configured with the following problem solving means.
[0013]
That is, the problem-solving means of the present invention is an electromagnetic induction heating type electric rice cooker comprising three or more sets of work coils, and is provided with work coil drive control means for driving and controlling each of the plurality of work coils. The work coil drive control means does not simultaneously drive a work coil that electromagnetically heats the same electromagnetic induction heating object among the plurality of work coils, but does not simultaneously drive different electromagnetic induction heating objects. The coils are configured to be driven simultaneously.
[0014]
According to such a configuration, at least the work coils having different electromagnetic induction heating objects can be driven at the same time, and the total heating output of the plurality of work coils driven at the same time is within the rated output range. By controlling the output so as to become, it becomes possible to meet the demand for high heating output in the temperature rising process at the time of cooking.
[0015]
In that case, when the work coils that are driven simultaneously are electromagnetic induction heated different electromagnetic induction heating objects, the vibration object (vibration characteristics) of the generated magnetic field is different, Interference sound hardly occurs.
【The invention's effect】
[0016]
As a result, according to the electric rice cooker of the present invention, by driving the work coils that share the object to be heated so as not to overlap each other, the interference of the magnetic field is reduced as much as possible, while the object to be heated is By driving the different work coils in an overlapping manner, the total output of each work coil can be made to correspond to a high heating output, and an effective high heating output can be obtained.
DETAILED DESCRIPTION OF THE INVENTION
[0017]
(Embodiment 1)
FIGS. 1-7 has shown the structure of the electromagnetic induction heating type electric rice cooker which concerns on Embodiment 1 of this invention provided with the some work coil.
[0018]
(Configuration of rice cooker body and lid unit)
First, FIGS. 1-4 has shown the structure of the rice cooker main body and cover unit part of the electric rice cooker.
[0019]
The electric rice cooker has, as its basic structure, a rice cooker body in which the rice cooker is stored and a lid unit that covers the top of the rice cooker body, and the bottom of the rice cooker (inner pot) in the rice cooker body. The first work coil for electromagnetic induction heating of the lower side of the rice cooker, the second work coil for electromagnetic induction heating of the side of the rice cooker on the side of the rice cooker, and the secondary side cover on the inner side of the lid unit Each induction heating member is equipped with a heat dissipation plate made of a magnetic metal material with high heat dissipation performance into the rice cooker (inner pan), and the heat dissipation plate is electromagnetically heated on the shoulder of the rice cooker body. It is comprised by the electromagnetic induction heating type thing provided with the 3rd work coil to do.
[0020]
That is, as shown in FIGS. 1 to 3, the electric rice cooker is generally made of a magnetic metal material (iron-based metal material) such as a stainless steel material capable of self-heating by an eddy current induced inside. A rice cooker (inner pot) 1, a synthetic resin-made inner case (protective frame) 2 formed in a bottomed cylindrical shape so that the rice cooker 1 can be arbitrarily stored and set, and the inner case 2 are held. A cylindrical outer case 3 that is an outer casing, and an opening at the top of the rice cooker body 4 formed into a bottomed cylindrical body with the upper case opened by connecting and integrating the outer case 3 and the inner case 2. It is comprised from the cover unit 5 provided so that opening and closing was possible.
[0021]
On the bottom wall portion 2a of the inner case 2, as shown in FIG. 3, for example, a first work coil L for heating rice cooker that is concentrically wound at different positions inside and outside in the radial direction. ₁ And the first work coil L ₁ The rice cooker 1 accommodated in the inner case 2 is heated uniformly by heating the central surface side and the side surface side of the bottom 1b of the rice cooker 1 to efficiently cook rice. Further, a second work coil L is provided on the side wall 2a of the inner case 2. ₂ And the second work coil L ₂ Is configured to heat the side surface portion 1a of the rice cooker 1 at the time of cooking and keeping warm.
[0022]
The outer case 3 includes, for example, a cylindrical cover member (side plate) 3a formed of a synthetic resin plate in the vertical direction, a synthetic resin shoulder member 3b provided at the upper end of the cover member 3a, The bottom member 3c is provided at the bottom of the cover member 3a. Then, the upper side of the shoulder member support piece 2b which is bent at the upper end side of the inner case 2 and is bent in the outer peripheral direction is engaged with and supported by the inner peripheral side hook-shaped shoulder piece 7 of the shoulder member 3b. And a third work coil L which is primary side electromagnetic induction heating means for electromagnetic induction heating the heat sink 10 which is a secondary side electromagnetic induction heating member. _Three Is provided.
[0023]
The third work coil L _Three Has a flat ring structure in which a litz wire is wound a plurality of times from the inner peripheral side to the outer peripheral side in the horizontal direction of the L-shaped coil holder 8 having an engaging rib 8a erected upward on the inner peripheral side. The upper and both sides thereof are covered with a synthetic resin coil cover 9 having a reverse J-shaped cross section, and are integrated with the upper end of the inner case 2 and the shoulder member 3b of the outer case 3, The opening edge part of the rice cooker main body 4 is comprised.
[0024]
And in this way the third work coil L _Three The opening edge of the rice cooker 1 with the opening 1b reduced in diameter relative to the opening edge of the rice cooker main body 4 provided with It comes to correspond.
[0025]
On the other hand, the lid unit main body portion, which is a non-magnetic member of the lid unit 5, has an outer cover 5A made of synthetic resin that constitutes the outer peripheral surface thereof, and an inner frame portion of the ridge in the circumferential direction inside the outer cover 5A. An inner space 5C is formed into a hollow heat insulating structure from an inner cover 5B made of synthetic resin that is fixedly provided.
[0026]
A heat radiating plate 10 made of a magnetic metal material capable of electromagnetic induction heating is detachably provided below the inner cover 5B of the lid unit main body. In addition, a pressure adjusting port 11 is formed in the central portion of the outer cover 5A and the inner cover 5B constituting the lid unit main body so as to penetrate in both the upper and lower directions. A large-diameter pressure adjusting unit 12 having a structure is detachably fitted from above. Further, a cylinder portion 13 for attaching the heat sink 10 is provided at the lower portion of the pressure adjusting port 11, and a relatively small-diameter fitting provided in the center of the heat sink 10 in the tube portion 13. The heat radiating plate 10 itself is attached in a detachable manner by fitting and locking the cylindrical portion 14 through a convex / concave portion provided therebetween.
[0027]
On the other hand, the base portion of the first packing 15a is fixed to the outer peripheral side fixing portion between the inner frame portion of the outer cover 5A and the inner cover 5B, and the heat radiating plate 10 has an upper surface on the outer peripheral side (seal portion). 10b upper surface) is sealed by the first packing 15a.
[0028]
In the configuration of the lid unit 5, the heat radiating plate 10 includes a heat radiating portion 10 a slightly projecting downward corresponding to the diameter of the opening 1 c reduced in diameter of the rice cooker 1, and an outer peripheral side of the heat radiating portion 10 a. There is a reverse U-shaped cross-section seal portion 10b covering the upper end of the opening portion 1a of the rice cooker 1 via the second packing 15b, and the opening of the rice cooker body 4 on the outer peripheral side of the seal portion 10b. Edge third work coil L _Three And the electromagnetic induction heating unit 10c facing each other with a predetermined gap G therebetween.
[0029]
For example, the third work coil L is driven by a third work coil drive circuit shown in FIG. _Three Is driven, the electromagnetic induction heating portion 10c on the outer periphery of the heat radiating plate 10 is heated by electromagnetic induction to generate heat, and the heat is transmitted to the heat radiating portion 10a via the seal portion 10b. It radiates | emits to the cooked rice in the rice cooker 1 from the whole surface of the part 10a.
[0030]
On the other hand, the outer cover 5A extends deeply downward until the outer peripheral edge of the outer periphery of the inner frame continues to the outer peripheral surface of the shoulder member 3b while increasing the outer diameter, and the third work coil L _Three The outer peripheral surface of the part is reliably covered so that the heat generated in the induction heating region is not released to the outside.
[0031]
Note that, for example, a substantially half-moon shaped operation panel portion 17 as shown in FIG. 1 is provided above the front portion of the rice cooker body 4. The operation panel 17 includes a liquid crystal display 19 having a sufficiently large and large display area, a rice cooking switch 17a, a timer reservation switch 17b, a cancel switch 17c, a heat retention / reheating switch 17d, a pot switch 17e, and a menu operation switch 17f. Various operation switches (touch key portion of the touch key switch) such as an hour switch 17g and a minute switch 17h are provided.
[0032]
(Configuration of the rice cooker body side control circuit)
Next, FIG. 5 shows a configuration of an electrical control circuit portion centering on a rice cooker body side rice cooking and heat retention control microcomputer control unit configured as described above.
[0033]
In the figure, reference numeral 32 denotes a rice cooking / heating control microcomputer control unit (CPU) provided with rice cooking heating control means, heat retention heating control means, inner pot temperature determination means, inner pot detection means, buzzer notification means, etc. The microcomputer control unit 32 is composed mainly of a microcomputer. For example, the temperature detection circuit unit of the rice cooker 1, the first, second and third work coil drive control circuit units, the presence / absence detection circuit unit of the rice cooker 1, and the oscillation circuit Part, reset circuit part, heat insulation heater drive control circuit part, buzzer notification part, power supply circuit part and the like.
[0034]
And first, in the temperature detection circuit 43 provided corresponding to the rice cooker temperature detection sensor S of the bottom wall part 1b side center sensor part of the rice cooker (inner pan) 1, for example, the rice cooker temperature detection sensor S is used. The temperature detection signal of the bottom wall part 3a of the rice cooker 1 is each input.
[0035]
Further, the first, second, and third work coil drive control circuit sections are, for example, first, second, and third pulse oscillation circuits 41A, 41B, and 41C, and first, second, and third synchronization, respectively. Trigger circuits 40A, 40B, 40C, first, second, and third IGBT drive circuits 42A, 42B, 42C, first, second, and third IGBTs 37A, 37B, 37C, first, second, and third It is formed by feedback circuits 34A, 34B, 34C, first, second and third resonance capacitors 38A, 38B, 38C and the like. By controlling the first, second, and third pulse oscillation circuits 41A, 41B, and 41C by the first, second, and third work coil drive control circuit units of the microcomputer control unit 32, for example, The first, second and third work coils L according to the rice cooking (or heat insulation) process ₁ , L ₂ , L _Three The heating temperature and heating pattern of the rice cooker 1 in each step of the rice cooking (or heat retaining) step are appropriately changed by appropriately changing the wattage of each and the ON duty ratio (for example, n seconds / 16 seconds) at the same wattage. Appropriate variable control is performed in consideration of the amount of heat retention), and proper heating output control is performed to achieve uniform water absorption and cooking of rice without unevenness in heating and heat retention.
[0036]
In this embodiment, the first, second, and third work coils L are used in those cases. ₁ , L ₂ , L _Three The mutual ON and OFF patterns are the first, second and third work coils L suitable for the required heating amount for each step of the rice cooking (warming) step as shown in the time chart of FIG. ₁ , L ₂ , L _Three The ON and OFF patterns are set and handled appropriately.
[0037]
The first, second and third work coils L ₁ , L ₂ , L _Three The ON / OFF pattern is set and controlled, for example, as shown in the flowchart of FIG.
[0038]
Reference numerals 22a to 22h denote the above-described various input switch units. When necessary ones of the switches are appropriately operated, the contents of the user's instruction are recognized by the recognition means on the microcomputer control unit 32 side, and the recognition is performed. The desired rice cooking or heat insulation heating pattern as described above is set according to the contents, and the rice cooking heating control means or the heat insulation heating control means is appropriately operated to perform the desired rice cooking or heat insulation.
[0039]
Therefore, the user uses the input switches 22a to 22h to cook rice or keep warm, timer reservation, reservation time setting, white rice or brown rice, early cooking, rice porridge, caulage or soft rice, sushi, rice cooking, etc. If the selection setting content of steaming, normal warming or low temperature warming, etc., is selected, the corresponding function content is cooked or steamed through the recognition means described above of the microcomputer control unit 32, and warmed. The setting is automatically input to the heating pattern setting unit, and the corresponding rice cooking or steaming and heat insulation heating control are appropriately performed.
[0040]
Furthermore, the code | symbol 17 is a buzzer alerting | reporting part which notifies completion of rice cooking etc., and 21 is a liquid crystal display part. In the case of this embodiment, the liquid crystal display unit 21 displays necessary items such as a desired menu and time corresponding to the ON operation of the input switches 22a to 22h. Various indications (such as a frame) are made.
[0041]
In FIG. 5, 31 is a power supply circuit, 33 is a zero cross signal circuit, 35 is a rectifier circuit, 36 is a smoothing capacitor, and CL is a choke coil.
[0042]
(Output control method for the first to third work coils)
Next, FIG. 6 has shown about the control method of each work coil output of the said electric rice cooker in this embodiment.
[0043]
In this control, first of all, step S ₁ The first to third work coils L ₁ ~ L _Three Output time (ON time in one cycle T shown in FIG. 7: heating time) is set (L ₁ > L ₂ = L _Three ).
[0044]
And then step S ₂ First, rice cooker bottom side first work coil L ₁ Drive. And thereby, the first work coil L ₁ The heating control is executed by the output of.
[0045]
Next step S _Three The first work coil L ₁ 3rd work coil L on the shoulder side of the body that is not adjacent to _Three It is determined whether or not the set heating time has elapsed, and if NO, step S _Four To the third work coil L _Three Drive.
[0046]
As a result, as shown in the time chart of FIG. 7, the first work coils L that are separated from the lower and upper portions of the rice cooker 1 and are not adjacent to each other. ₁ And the third work coil L _Three Are driven simultaneously (at least the third work coil L _Three Within heating time).
[0047]
On the other hand, the above third work coil L of YES _Three If the set heating time is YES, step S _Five To the third work coil L _Three Set to OFF.
[0048]
Then step S ₆ To the first work coil L ₁ It is determined whether or not the set heating time has elapsed, and when the answer is NO, the first and third work coils L ₁ , L _Three Simultaneous drive or third work coil L _Three First work coil L after OFF ₁ Only the driving of the first work coil L is continued until YES. ₁ Is stopped, and then step S ₈ In the second work coil L ₂ Drive only. The second work coil L ₂ The driving state of the following step S ₉ In the second work coil L ₂ This is continued until it is determined that the set heating time has elapsed.
[0049]
As a result, as is apparent from the time chart of FIG. 7, the first and second work coils L ₁ , L ₂ The second work coil L at the middle position of the rice cooker side wall adjacent to ₂ In the case of, always the second work coil L ₂ Only will be driven alone.
[0050]
Next step S ₉ The second work coil L ₂ If it is determined that the set heating time has elapsed, the following step S _Ten The second work coil L ₂ Set to OFF.
[0051]
Then, in the next cycle, the first to third work coils L similar to the above are again formed. ₁ ~ L _Three Drive control (step S ₁ ~ S _Ten ) Is repeated (see FIG. 7), and when a predetermined time (N × T... N is the number of times of control) has elapsed, the heating control that reaches the predetermined target rice cooker temperature in the predetermined process during the rice cooking process is performed. Realized.
[0052]
As described above, in this embodiment, as described above, a plurality of work coils L of three or more sets adjacent to each other. ₁ , L ₂ , L _Three In the electromagnetic induction heating type electric rice cooker comprising the above-mentioned plurality of work coils L ₁ , L ₂ , L _Three Are provided with work coil drive control means for driving and controlling each of the plurality of work coils L. ₁ , L ₂ , L _Three Work coils L adjacent to each other ₁ And L ₂ , L ₂ And L _Three It is characterized by not being driven at the same time.
[0053]
According to such a configuration, the other work coils L that are not adjacent to each other. ₁ And L _Three The plurality of work coils L that can be driven at the same time and are driven simultaneously. ₁ , L _Three By controlling the output so that the total heating output is within the range of the maximum rated output 1400 (W) of one outlet, it is possible to meet the demand for high heating output in the heating process during cooking It becomes.
[0054]
On the other hand, a plurality of work coils L that are driven simultaneously and are not adjacent to each other ₁ , L _Three Since these distances are spatially separated from the lower and upper portions of the rice cooker 1, the individual work coils L ₁ , L _Three The magnetic fields generated in are less likely to interfere with each other, and interference sounds are not likely to occur.
[0055]
In the above configuration, a plurality of work coils L ₁ , L ₂ Are configured to electromagnetically heat the rice cooker 1 which is the same electromagnetic induction heating product.
[0056]
On the other hand, a plurality of work coils L driven simultaneously. ₁ And L _Three In such a case, different electromagnetic induction heating objects, such as the rice cooker 1 and the heat sink 5, are heated by electromagnetic induction. Therefore, in this case, the object to be vibrated (vibration characteristics) of the generated magnetic field is different, and interference sound is unlikely to occur.
[0057]
Therefore, what should be a problem in noise reduction is that the plurality of work coils respectively electromagnetically heat the same electromagnetic induction heating object. ₁ , L ₂ In this case, the configuration in which the simultaneous driving is not performed as described above is particularly effective.
[0058]
From this point of view, in the above configuration, the work coil L that is driven simultaneously. ₁ , L _Three Is configured to electromagnetically heat different electromagnetic induction heating objects, the rice cooker 1 and the heat sink 5.
[0059]
Therefore, even if driven at the same time, the vibration object (vibration characteristics) of the generated magnetic field is different, and interference sound is unlikely to occur.
[0060]
Therefore, also from this point of view, the above-described configuration has a beneficial effect on noise reduction.
[0061]
Furthermore, in the above configuration, the work coil L that is driven simultaneously. ₁ And L _Three Are different in output size from each other (L ₁ > L _Three ).
[0062]
As described above, a plurality of work coils L ₁ , L _Three Are driven simultaneously, each of those work coils L ₁ , L _Three The total heating output must be set within a predetermined rated output 1400 (W).
[0063]
On the other hand, work coil L ₁ , L _Three When each of these is employed as a heating means, it does not function effectively as an electromagnetic induction heating means unless there is an output of a predetermined size at a minimum.
[0064]
Therefore, the adjustment of the total heating output as described above to within the rated output 1400 (W) is performed by the plurality of work coils L. ₁ , L _Three Output is different (L ₁ > L _Three ) Work coil L with small output _Three First, set the output of the one to a predetermined required size, and then the work coil L with a large output ₁ The output is adjusted by reducing the output of the.
[0065]
As a result of the above, according to the electric rice cooker of this embodiment, the magnetic coil interference is reduced as much as possible by driving the work coils adjacent to each other in the plurality of work coils so as not to overlap each other. On the other hand, by driving the work coils that are not adjacent to each other and differing in the electromagnetic induction heating object to overlap each other, their total output is made to correspond to the high heating output. Therefore, an effective high heating output can be obtained while reducing noise.
[0066]
(Embodiment 2)
In addition, when the work coils that are driven simultaneously as described above are configured to electromagnetically heat different electromagnetic induction heating objects, the vibration object (vibration characteristics) of the generated magnetic field differs and interference occurs. Although it is difficult to generate sound, it does not mean that no interference sound is generated.
[0067]
Accordingly, even in such a case, it is preferable not to drive at least when the work coils are adjacent to each other.
[0068]
(Embodiment 3)
Next, FIG. 8 has shown the structure of the electromagnetic induction heating type electric rice cooker which concerns on Embodiment 3 of this invention.
[0069]
In the configuration of the first embodiment, the first, second and third work coils L ₁ , L ₂ , L _Three The third work coil L _Three In the main body shoulder portion, it corresponds to the electromagnetic induction heating object 10c of the lid unit 5 side radiator plate 10, but in this embodiment, the third work coil L _Three Are arranged in a vertical shape corresponding to the reduced-diameter opening 1c of the rice cooker 1, and the opening 1c of the rice cooker 1 and the third work coil L _Three The indirect heating member 6 having a U-shaped cross section made of a magnetic metal material capable of electromagnetic induction heating is provided in a ring shape.
[0070]
When such a configuration is adopted, the third work coil L _Three However, unlike the case of the first embodiment, both the indirect heating member 6 and the electromagnetic induction heating object 10c of the heat radiating plate 10 are heated by electromagnetic induction.
[0071]
Therefore, also in this case, the third work coil L _Three Are the first and second work coils L for electromagnetic induction heating of the rice cooker 1 as well. ₁ , L ₂ Is different from the electromagnetic induction heating object.
[0072]
As a result, the first work coil L ₁ And the third work coil L _Three Can be driven simultaneously as in the second embodiment.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing a configuration of an entire rice cooker body portion of an electric rice cooker according to Embodiment 1 of the present invention.
FIG. 2 is an enlarged cross-sectional view of second and third work coil installation portions on the upper part of the rice cooker body of the electric rice cooker.
FIG. 3 is an enlarged cross-sectional view of a first work coil installation portion at the lower part of the rice cooker body of the electric rice cooker.
FIG. 4 is a skeleton diagram showing an outline of a basic configuration of the electric rice cooker.
FIG. 5 is an electric circuit diagram of first, second, and third work coil drive control circuit portions that are the main part of the electric rice cooker.
FIG. 6 is a flowchart showing basic control operations of the first to third work coils during normal rice cooking of the electric rice cooker.
FIG. 7 is a time chart showing ON, OFF patterns of the first, second, and third work coils in the rice cooking process of the electric rice cooker.
FIG. 8 is a skeleton diagram showing an outline of a basic configuration of a rice cooker body portion of an electric rice cooker according to Embodiment 2 of the present invention.
FIG. 9 is a time chart showing ON / OFF patterns of first and second work coils in a heating process of a conventional electric rice cooker.
FIG. 10 is a time chart showing ON, OFF patterns of first, second, and third work coils in a heating process of a conventional electric rice cooker.
[Explanation of symbols]
1 is a rice cooker, 2 is an inner case, 3 is an outer case, 3a is a cover member, 3b is a shoulder member, 4 is a rice cooker body, 5 is a lid unit, 10 is a heat sink, 32 is a microcomputer control unit, 37A is the first 1 IGBT, 37B is the second IGBT, 38A is the first resonance capacitor, 38B is the second resonance capacitor, 30 is the buzzer, L ₁ Is the first work coil, L ₂ Is the second work coil. L _Three Is a third work coil.

Claims (1)

  In an electromagnetic induction heating rice cooker comprising three or more sets of work coils, a work coil drive control means for driving and controlling each of the plurality of work coils is provided, and the work coil drive control means comprises the above The work coil for electromagnetic induction heating of the same electromagnetic induction heating object among a plurality of work coils is not driven at the same time, but the work coils for electromagnetic induction heating of different electromagnetic induction heating objects are driven simultaneously. An electric rice cooker characterized by

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