JPH1187036A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker more quiet than a conventional one. SOLUTION: A body case 14 is divided into a part housing both an IGBT (switching element) 16 and a diode bridge 19 and part receiving a resonant capacitor 17, a smoothing capacitor 18, a filter coil 20, a filter capacitor 21 and a control circuit 22 depending on the difference in heat radiation, heat resistant temperature and the like of components and only the IGBT 16 and the diode bridge 19 are cooled by a cooling fan 23 and other parts are cooled by the heat radiation from the side face of the body case 14; thereby, the gas quantity of the cooling fan 23 is reduced, so that the quietening of an induction cooking device is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent induction heating cooker.

[0002]

2. Description of the Related Art A conventional induction heating cooker generally has a configuration shown in FIG. Hereinafter, the induction heating cooker will be described with reference to FIGS. 5 and 6.

FIG. 5 is a perspective view of a conventional induction heating cooker, and FIG. 6 is a schematic circuit configuration thereof. In the drawing, 1 is a main body case, 2 is a heating coil, and 3 is an IG which is a switching element.
BT, 4 is a resonance capacitor, 5 is a smoothing capacitor, 6 is a diode bridge as a rectifier, 7 is a filter coil, 8 is a filter capacitor, 9 is a control circuit, 10 is a cooling fan, and the IGBT 3 and the diode bridge 6 are heat sinks 11. And a top plate 12 on which a pan is placed is attached to the upper surface of the main body case 1. Reference numeral 13 denotes an AC power supply.

When the induction heating cooker operates, each component constituting the circuit generates heat due to its own loss.
These heats are radiated outside the main body case 1 by the cooling fan 10.

[0005]

In such a conventional induction heating cooker, since the components constituting the circuit are arranged at appropriate positions in the main body case 1, components that generate a large amount of heat are replaced with components that generate a small amount of heat. Since the components having a high heat-resistant temperature have an adverse effect on the components having a low heat-resistant temperature, and the entire interior of the main body case 1 is radiated by the cooling fan 10, the cooling fan 10 Requires a large amount of air due to the cooling fan 10
The noise generated from the motors that make up the loudspeaker was increasing.

[0006] In view of the foregoing, an object of the present invention is to provide an induction heating cooker that is quieter than the conventional one.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a main body case and at least a heating coil, a switching element, a resonance capacitor, a smoothing capacitor, a rectifier, a filter coil, and a filter housed in the main body case. The main body case includes a capacitor and each part of a control circuit, and the main body case is provided with a cut-out plate on the inner side of the bottom surface in order to store each of the parts in a plurality of groups.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claims 1 to 5 is directed to a main body case, a heating coil, a switching element, a resonance capacitor, a smoothing capacitor, a rectifier, a filter coil, a filter capacitor, and a control circuit. The main body case has a configuration in which a cut-out plate is provided on the inner side in order to store each of the components in two or more groups. According to the above, the components can be appropriately divided and stored in the main body case, and the adverse effect of heat between components having different heat values and heat-resistant temperatures can be eliminated.

According to the sixth aspect of the present invention, since the heat insulating material is arranged below the top plate on which the cooking pot is placed, the influence of the heat from the cooking pot on the components inside the cooker housing is reduced. The same effect can be obtained.

[0010] The invention according to claim 7 enhances the heat insulating effect of the partition plate by increasing the thickness of the partition plate in the portion close to the part that dissipates a large amount of heat as compared with the other portions, and achieves the same effect as above. Can be obtained.

According to the eighth aspect of the present invention, by providing the cooling fan, if only the heat-generating portion out of the divided storage portions is radiated by the cooling fan, the air volume of the cooling fan can be reduced, and the noise can be reduced. Can be

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view of an induction heating cooker according to a first embodiment of the present invention.
5 is a heating coil, 16 is an IGB which is a switching element
T, 17 is a resonance capacitor, 18 is a smoothing capacitor, 1
9 is a diode bridge which is a rectifier, 20 is a filter coil, 21 is a filter capacitor, 22 is a control circuit,
Reference numeral 23 denotes a cooling fan, the IGBT 16 and the diode bridge 19 are attached to a heat sink 24, and a top plate 25 on which a pan is placed is placed on the top surface of the main body case 14.
Is attached. The inside of the main body case 14 is divided into two storage parts by a partition plate 26 inside the bottom surface of the main body case. That is, the portion housing the IGBT 16 and the diode bridge 19 and the resonance capacitor 17
And a filter capacitor 20, a filter coil 20, a filter capacitor 21, and a control board 22.
The cooling fan 23 is provided in a portion housing the IGBT 16 and the diode bridge 19. Further, a heat insulating material 27 is disposed on the upper part of the main body case 14.

FIG. 2 is a schematic circuit configuration of an induction heating cooker according to a first embodiment of the present invention, and 28 is an AC power supply.

The operation of the induction cooking device configured as described above will be described. When the induction heating cooker operates, the circuit components generate heat due to the loss. The pot (not shown) placed on the top plate 25 radiates heat as the cooking process proceeds, but the heat insulating material 27 reduces the influence of the heat radiation on each component inside the main body case 14.

The IGBT 16 and the diode bridge 19 are semiconductor elements. Since the heat capacity is large despite the small heat capacity of the component itself, the IGBT 16 and the diode bridge 19 are attached to the heat sink 24 and forcibly cooled by the cooling fan 23. In this case, since the cooling fan 23 only needs to cool the IGBT 16 and the diode bridge 19, the air volume can be reduced as compared with the conventional case where the entire body case is cooled.

Resonant capacitor 17 and smoothing capacitor 18
The filter coil 20, the filter capacitor 21, and the control circuit 22 have a relatively small loss and a relatively small amount of self-heating, and are housed together so as not to be affected by the heat of other components that generate a relatively large amount of heat. The heat generated in this portion is radiated from the side surface of the main body case 14 in this storage portion, and the resonance capacitor 17, the smoothing capacitor 18, the filter coil 20, the filter capacitor 21, and the control circuit 22
Is cooled.

In the first embodiment described above, the configuration of the inverter is as shown in FIG. 2. However, an inverter having a SEPP configuration having two switching elements or an inverter having two resonance capacitors may be used. The inverter may have any configuration as long as it has a heating coil, a switching element, and a resonance capacitor. In addition to the configuration of the filter circuit shown in FIG. 2, various configurations such as a configuration having two or more filter coils, a configuration having two or more filter capacitors, and a configuration having two or more each are provided. It may be something. In addition, the number of divisions inside the body, the combination when storing parts, etc.
Anything is fine.

(Embodiment 2) FIG. 3 is a perspective view of an induction heating cooker according to a second embodiment of the present invention.
0 is a heating coil, 31 is an IGB which is a switching element
T, 32 is a resonance capacitor, 33 is a smoothing capacitor, 3
4 is a rectifier diode bridge, 35 is a filter coil, 36 is a filter capacitor, 37 is a control circuit,
Reference numeral 38 denotes a cooling fan, the IGBT 31 and the diode bridge 34 are attached to a heat sink 39, and a top plate 40 on which a pan is placed is provided on the top surface of the main body case 29.
Is attached. The inside of the main body case 29 is divided into two storage parts by a partition plate 41 inside the bottom surface of the main case and a partition plate 42 inside the top surface of the main case. That is, the IGBT 31 and the diode bridge 34
, A resonance capacitor 32, a smoothing capacitor 33, a filter coil 35, and a filter capacitor 36.
And the control board 37. Cooling fan 38
Is disposed in a portion housing the IGBT 31 and the diode bridge 34. Further, a heat insulating material 43 is disposed on the upper part of the main body case 29.

The operation of the induction cooking device configured as described above will be described. When the induction heating cooker operates, the circuit components generate heat due to the loss.

The pot (not shown) placed on the top plate 40 radiates heat as the cooking process progresses, but the heat insulating material 43 reduces the influence of the heat radiation on each component inside the main body case 29. You.

The IGBT 31 and the diode bridge 34 are semiconductor elements and generate a large amount of heat in spite of the small heat capacity of a single component, so that the IGBT 31 and the diode bridge 34 are attached to a heat sink 39 and are forcibly cooled by a cooling fan 38. In this case, since the cooling fan 38 only needs to cool only the IGBT 31 and the diode bridge 34, the air volume can be reduced as compared with the conventional case where the entire inside of the main body case is cooled.

Resonant capacitor 32 and smoothing capacitor 33
The filter coil 35, the filter capacitor 36, and the control circuit 37 have relatively small loss and relatively small self-heating, and are separately housed together so as not to be affected by the heat of other components that generate relatively large heat. The heat generated in this portion is radiated from the side surface of the main body case 29 in the storage portion, and the resonance capacitor 32, the smoothing capacitor 33, the filter coil 35, the filter capacitor 36, and the control circuit 37
Is cooled.

Further, since these two storage portions are divided into two by a partition plate 41 inside the bottom surface of the main body case and a partition plate 42 inside the upper surface, the adverse effect of heat between the storage portions is further reduced. You.

In the above-described second embodiment, the configuration of the inverter is as shown in FIG. 2. However, an inverter having a SEPP configuration having two switching elements or an inverter having two resonance capacitors may be used. The inverter may have any configuration as long as it has a heating coil, a switching element, and a resonance capacitor. In addition to the configuration of the filter circuit shown in FIG. 2, various configurations such as a configuration having two or more filter coils, a configuration having two or more filter capacitors, and a configuration having two or more each are provided. It may be something. In addition, the number of divisions inside the body, the combination when storing parts, etc.
Anything is fine.

(Embodiment 3) FIG. 4 is a perspective view of an induction heating cooker according to a third embodiment of the present invention.
A plurality of ventilation holes are provided on the upper surface and side surfaces of the main body case 44. 45 is a heating coil composed of a high heat-resistant material,
Reference numeral 46 denotes an IGBT as a switching element, 47 denotes a resonance capacitor, 48 denotes a smoothing capacitor, 49 denotes a diode bridge as a rectifier, 50 denotes a filter coil, 51 denotes a filter capacitor, and 52 denotes a control circuit.
6 and the diode bridge 49 are attached to a heat sink 53, and a top plate 54 on which a pot is placed is attached to the uppermost surface of the main body case 44. Body case 4
The inside of 4 is divided into three storage portions by a partition plate 55 inside the bottom surface of the main body case and a partition plate 56 inside the side surface of the main case. That is, a part that houses the heating coil 45, a part that houses the IGBT 46 and the diode bridge 49, and a part that houses the resonance capacitor 47, the smoothing capacitor 48, the filter coil 50, the filter capacitor 51, and the control board 52. Further, a heat insulating material 57 is disposed on the upper part of the main body case 44.

The operation of the induction cooking device configured as described above will be described. When the induction heating cooker operates, the circuit components generate heat due to the loss.

The pot (not shown) placed on the top plate 54 radiates heat as the cooking process proceeds. However, the heat insulating material 57 reduces the influence of the heat radiation on each component inside the main body case 44. You.

Since the heating coil 45 is made of a high heat-resistant material, the amount of heat radiation is small. Heating coil 45
Is radiated from a plurality of vents provided on the upper surface of the main body case 44 in a portion housing the heat coil, and the heating coil 45 is cooled.

I attached to the heat sink 53
The heat generated by the GBT 46 and the diode bridge 49 is radiated from a plurality of vents provided on the side surface of the main body case 44 in a portion housing the GBT 46 and the diode bridge 49, and the IGBT 46 and the diode bridge 49 are cooled.

Resonant capacitor 47 and smoothing capacitor 48
, The filter coil 50, the filter capacitor 51, and the control circuit 52 have a relatively small loss and a relatively small self-heating, and are separately housed together so as not to be affected by the heat of other components generating a relatively large amount of heat. The heat generated in this portion is radiated from a plurality of ventilation holes provided on the side surface of the main body case 44 in the storage portion, and the resonance capacitor 47, the smoothing capacitor 48, the filter coil 50, the filter capacitor 51, and the control circuit 52 are cooled. Is done.

In this case, since each component sufficiently dissipates heat, it is possible to omit the cooling fan that was conventionally required.

In the above third embodiment, the configuration of the inverter is as shown in FIG. 2. However, an inverter having a SEPP configuration having two switching elements or an inverter having two resonance capacitors may be used. The inverter may have any configuration as long as it has a heating coil, a switching element, and a resonance capacitor. In addition to the configuration of the filter circuit shown in FIG. 2, various configurations such as a configuration having two or more filter coils, a configuration having two or more filter capacitors, and a configuration having two or more each are provided. It may be something. In addition, the number of divisions inside the body, the combination when storing parts, etc.
Anything is fine.

[0034]

As described above, according to the first to fifth aspects of the present invention, the main body case includes the heating coil, the switching element, the resonance capacitor, the smoothing capacitor, the rectifier, and the filter coil housed in the main body case. Since the filter capacitor and control circuit components are divided into two or more groups and housed inside the bottom surface of the main body case so as to accommodate them, the difference in the heat value of each component and the heat resistance temperature According to the difference or the like, it can be appropriately divided into several parts and housed in the main body case, so that the adverse effect of heat between components having different heat values and heat-resistant temperatures can be eliminated.

According to the sixth aspect of the present invention, since the heat insulating material is arranged below the top plate, the same effect can be effectively obtained with a simple configuration.

According to the seventh aspect of the present invention, the thickness of the partition plate in the portion close to the part having a large amount of heat radiation is increased.
The same effect as described above can be obtained.

According to the eighth aspect of the present invention, since the cooling fan is provided, only the heat-generating portion of the divided storage portions is radiated by the cooling fan to reduce the air volume of the cooling fan. Yes, it can be quiet.

[Brief description of the drawings]

FIG. 1 is a perspective view of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of the induction cooking device.

FIG. 3 is a perspective view of an induction heating cooker according to a second embodiment of the present invention.

FIG. 4 is a perspective view of an induction heating cooker according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a conventional induction heating cooker.

FIG. 6 is a circuit configuration diagram of the induction heating cooker.

[Explanation of symbols]

1, 14, 29, 44 ... main body case 2, 15, 30, 45 ... heating coil 3, 16, 31, 46 ... IGBT (switching element) 4, 17, 32, 47 ... resonance capacitor 5, 18, 33, 48 ... Smoothing capacitors 6, 19, 34, 49 ... Diode bridges (rectifiers) 7, 20, 35, 50 ... Filter coils 8, 21, 36, 51 ... Filter capacitors 9, 22, 37, 52 ... Control circuits 10, 23, 38 cooling fan 11, 24, 39, 53 heat sink 12, 25, 40, 54 top plate 13, 28 AC power supply 26, 41, 42, 55, 56 partition board 27, 43, 57 heat insulating material ( Insulation configuration on the top of the body case)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hidekazu Yamashita 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. A main body case and at least a heating coil, a switching element, a resonance capacitor, a smoothing capacitor, a rectifier, a filter coil housed in the main body case,
With a filter capacitor, and each component of the control circuit,
The induction heating cooker, wherein the main body case is provided with a cut-off plate at least on the inner side of the bottom surface to divide and store the parts in a plurality of groups. 2. A main body case and at least a heating coil, a switching element, a resonance capacitor, a smoothing capacitor, a rectifier, a filter coil housed in the main body case,
With a filter capacitor, and each component of the control circuit,
The induction heating cooker, wherein the main body case is provided with a cut-off plate at least on an inner side of an upper surface thereof so as to divide and store the parts in a plurality of groups. 3. A main body case, and at least a heating coil, a switching element, a resonance capacitor, a smoothing capacitor, a rectifier, a filter coil housed in the main body case,
With a filter capacitor, and each component of the control circuit,
The induction heating cooker, wherein the main body case is provided with a cut-off plate at least on the inner side of the side so as to divide and store the parts in a plurality of groups. 4. The induction heating cooker according to claim 1, wherein a partition plate is also provided inside the upper surface. 5. The induction heating cooker according to claim 1, wherein a partition plate is also provided inside the side surface. 6. The induction heating cooking according to claim 1, further comprising a top plate on which a cooking pot is placed on an upper portion of the main body case, and a heat insulating material disposed on a lower portion of the top plate. vessel. 7. The induction heating cooker according to claim 1, wherein the partition plate is made thicker at a portion where the amount of heat radiation is particularly large as compared with other portions. 8. The induction heating cooker according to claim 1, wherein a cooling fan is provided inside the main body case.