CN108024406B - Electromagnetic heating system and control method and device thereof - Google Patents
Electromagnetic heating system and control method and device thereof Download PDFInfo
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- CN108024406B CN108024406B CN201610973468.8A CN201610973468A CN108024406B CN 108024406 B CN108024406 B CN 108024406B CN 201610973468 A CN201610973468 A CN 201610973468A CN 108024406 B CN108024406 B CN 108024406B
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- driving voltage
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0261—For cooking of food
- H05B1/0266—Cooktops
Abstract
The invention discloses a control method of an electromagnetic heating system, which comprises the following steps: acquiring target heating power of an electromagnetic heating system; judging whether the target heating power is smaller than a preset power or not; if the target heating power is smaller than the preset power, a first driving voltage for a first preset time, a second driving voltage for a second preset time and a first driving voltage for a third preset time are sequentially provided to the power switch tube in the electromagnetic heating system in each switching-on control period, wherein the first driving voltage is smaller than the second driving voltage, continuous low-power heating can be achieved, meanwhile, pulse current when the power switch tube is switched on is effectively restrained, and cooking experience of a user is improved. The invention also discloses a control device of the electromagnetic heating system and the electromagnetic heating system.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a control method of an electromagnetic heating system, a control device of the electromagnetic heating system and the electromagnetic heating system.
Background
In the related art, an electromagnetic resonance circuit of a single IGBT generally adopts a parallel resonance mode, and sets resonance parameters on the premise of realizing high-power operation, as shown in fig. 1, when heating is performed with high power, due to the matching relationship of the resonance parameters, the leading voltage when the IGBT is turned on is very small, and the pulse current of the IGBT is also very small. However, if continuous low-power heating is employed, as shown in fig. 2, the leading voltage of the IGBT is very high, resulting in a very large pulse current of the IGBT, which is particularly liable to exceed the limit of use of the IGBT, and damage the IGBT. If the duty cycle mode shown in fig. 3 is used to achieve low power heating, the intermittent heating mode may affect the cooking function, such as easily overflowing during cooking porridge, and reduce the cooking experience of the user.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a control method for an electromagnetic heating system, which can realize continuous low-power heating and effectively suppress the pulse current of a power switch tube.
A second object of the present invention is to provide a control device for an electromagnetic heating system, and a third object of the present invention is to provide an electromagnetic heating system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a control method for an electromagnetic heating system, including the following steps: acquiring target heating power of an electromagnetic heating system; judging whether the target heating power is smaller than a preset power or not; if the target heating power is smaller than the preset power, sequentially providing a first driving voltage for a first preset time, a second driving voltage for a second preset time and the first driving voltage for a third preset time to a power switch tube in the electromagnetic heating system in each switching-on control period, wherein the first driving voltage is smaller than the second driving voltage.
According to the control method of the electromagnetic heating system provided by the embodiment of the invention, firstly, the target heating power of the electromagnetic heating system is obtained; then judging whether the target heating power is smaller than the preset power; if the target heating power is smaller than the preset power, in each switching-on control period, a first driving voltage of a first preset time, a second driving voltage of a second preset time and a first driving voltage of a third preset time are sequentially provided to a power switch tube in the electromagnetic heating system, so that continuous low-power heating can be realized, pulse current of the power switch tube can be effectively inhibited, and cooking experience of a user is improved.
In addition, the control method of the electromagnetic heating system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, if the target heating power is greater than or equal to the preset power, the second driving voltage is continuously supplied to the power switch tube in each turn-on control period.
According to an embodiment of the present invention, the first driving voltage is equal to or greater than 5V and equal to or less than 14.5V, and the second driving voltage is equal to or greater than 15V.
According to an embodiment of the present invention, the first preset time is greater than or equal to 0.5us and less than or equal to 5us, and the third preset time is less than or equal to 5 us.
In order to achieve the above object, a second embodiment of the present invention provides a control device for an electromagnetic heating system, including: the driving unit is connected with a control end of a power switch tube in the electromagnetic heating system so as to drive the power switch tube; the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring target heating power of the electromagnetic heating system; the control unit is used for judging whether the target heating power is smaller than the preset power or not, and controlling the driving unit to sequentially provide a first driving voltage for a first preset time, a second driving voltage for a second preset time and a first driving voltage for a third preset time to the power switch tube in the electromagnetic heating system in each switching-on control period when the target heating power is smaller than the preset power, wherein the first driving voltage is smaller than the second driving voltage.
According to the control device of the electromagnetic heating system provided by the embodiment of the invention, the target heating power of the electromagnetic heating system is obtained through the obtaining unit, then the control unit judges whether the target heating power is smaller than the preset power, and when the target heating power is smaller than the preset power, the control driving unit sequentially provides the first driving voltage for the first preset time, the second driving voltage for the second preset time and the first driving voltage for the third preset time to the power switch tube in the electromagnetic heating system in each switching control period, so that continuous low-power heating can be realized, the pulse current when the power switch tube is switched on can be effectively inhibited, and the cooking experience of a user is improved.
In addition, the control method of the electromagnetic heating system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the control unit is further configured to control the driving unit to continuously provide the second driving voltage to the power switching tube in each on control period when the target heating power is greater than or equal to the preset power.
According to an embodiment of the present invention, the first driving voltage is equal to or greater than 5V and equal to or less than 14.5V, and the second driving voltage is equal to or greater than 15V.
According to an embodiment of the present invention, the first preset time is greater than or equal to 0.5us and less than or equal to 5us, and the third preset time is less than or equal to 5 us.
In order to achieve the above object, a third aspect of the present invention provides an electromagnetic heating system, which includes the control device of the electromagnetic heating system of the above embodiment.
According to the electromagnetic heating system provided by the embodiment of the invention, through the control device arranged in the electromagnetic heating system, continuous low-power heating can be realized, meanwhile, the pulse current when the power switch tube is switched on is effectively inhibited, and the cooking experience of a user is improved.
Drawings
Fig. 1 is a schematic view of a driving waveform of an IGBT when an electromagnetic heating system heats at a high power in the related art;
fig. 2 is a schematic view of a driving waveform of an IGBT when an electromagnetic heating system in the related art heats at a continuously low power;
fig. 3 is a schematic view of a driving waveform of TGBT when the electromagnetic heating system performs low power heating in a duty cycle manner in the related art;
fig. 4 is a flowchart of a control method of an electromagnetic heating system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the driving waveforms of the IGBT during low power heating of the electromagnetic heating system according to one embodiment of the present invention;
FIG. 6 is an enlarged view of portion A of FIG. 5;
FIG. 7 is a block schematic diagram of a control arrangement of an electromagnetic heating system according to an embodiment of the present invention; and
fig. 8 is a block schematic diagram of an electromagnetic heating system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of an electromagnetic heating system, a control apparatus of an electromagnetic heating system, and an electromagnetic heating system proposed according to an embodiment of the present invention are described below with reference to the drawings.
Fig. 4 is a flowchart of a control method of an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 4, the control method includes the steps of:
s101: acquiring a target heating power W1 of the electromagnetic heating system;
wherein the target heating power W1 is the heating power required by the electromagnetic heating system under different cooking parameters. For example, when a user wants to cook millet congee, a congee cooking mode can be selected on a control panel of the electromagnetic heating system, the electromagnetic heating system enters the congee cooking mode, and the electromagnetic heating system can perform low-power heating at a heating power of 800W in the congee cooking mode, wherein the corresponding target heating power is 800W.
S102: judging whether the target heating power W1 is smaller than a preset power W2;
the preset power W2 may be a power value calibrated according to an actual situation in the electromagnetic heating system, and when the target heating power W1 is smaller than the preset power W2, it is determined that the electromagnetic heating system is low-power heating.
S103: if the target heating power W1 is less than the preset power W2, in each on control period, a first driving voltage V1 for a first preset time T1, a second driving voltage V2 for a second preset time T2 and a first driving voltage V1 for a third preset time T3 are sequentially provided to a power switching tube in the electromagnetic heating system, wherein the first driving voltage V1 is less than the second driving voltage V2.
That is, when the target heating power W1 is less than the preset power W2, the electromagnetic heating system will perform low-power heating, and at this time, as shown in fig. 5 and fig. 6, the power switch tube may be driven in a convex manner, that is, in each on control period of the power switch tube, the power switch tube is first driven by the first driving voltage V1 to operate in an amplification state, so as to effectively suppress the pulse current when the power switch tube is on, and after the first preset time T1, the power switch tube is driven by the second driving voltage V2 to operate in a saturation conduction state, that is, the power switch tube is normally on, and after the second preset time T2, the power switch tube is driven by the first driving voltage V1 for the third preset time T3 to operate the power switch tube in the amplification state.
According to an embodiment of the invention, if the target heating power W1 is equal to or greater than the preset power W2, the second driving voltage V2 is continuously supplied to the power switch tube every on control period.
That is, when the target heating power W1 is equal to or greater than the preset power W2, the electromagnetic heating system will perform high-power heating, and at this time, the power switch tube may be driven only by the second driving voltage V2, that is, the power switch tube is directly and normally turned on.
According to an embodiment of the present invention, the first driving voltage V1 is equal to or greater than 5V and equal to or less than 14.5V, and the second driving voltage V2 is equal to or greater than 15V.
According to an embodiment of the present invention, the first preset time T1 is greater than or equal to 0.5us and less than or equal to 5us, and the third preset time T3 is less than or equal to 5 us.
For example, as shown in fig. 5 and fig. 6, the preset power is W2, for example, 1000W, when the user selects the porridge cooking mode of the electromagnetic heating system, assuming that the target heating power corresponding to the porridge cooking mode is W1, for example, 800W, it can be determined that the target heating power W1 is smaller than W2, and then in each on control period, the first driving voltage V1, for example, 9V, may be provided to the power switch tube, for example, an IGBT, and when the IGBT is driven by the 9V voltage, the IGBT operates in an amplification state, and the C pole current of the IGBT is constantly about 22A, so that the pulse current is effectively suppressed. After driving with the first driving voltage V1 for a first preset time T1, e.g., 2us, the second driving voltage V2, e.g., 15V, is provided to the power switch, and after driving with the second driving voltage V2 for a second preset time T2, the first driving voltage V1, e.g., 9V, is provided to the power switch for a third preset time T3, e.g., 5 us. Therefore, the electromagnetic heating system can be controlled to perform continuous low-power heating according to the control method of the embodiment, and the problems of bottom pasting, overflow and the like caused by intermittent heating are avoided.
When the user selects the hot pot mode of the electromagnetic heating system, assuming that the target heating power corresponding to the hot pot mode is W1 ', for example 2000W, it can be determined that the target heating power W1' is greater than W2, and in each on control period, the second driving voltage V2, for example 15V, can be directly provided to the power switch tube to drive the power switch tube to be normally on.
It should be noted that, in the embodiment of the present invention, the power switch is turned on or off under the driving of the driving unit, and the driving voltage output from the driving unit to the power switch can be switched by switching the power supply voltage of the driving unit, for example, when the first preset power supply is controlled to supply power to the driving unit, the driving unit outputs the first driving voltage V1 to the power switch, and when the second preset power supply is controlled to supply power to the driving unit, the driving unit outputs the second driving voltage V2 to the power switch, and the voltage VCC of the first preset power supply is smaller than the voltage VDD of the second preset power supply.
According to the control method of the electromagnetic heating system provided by the embodiment of the invention, firstly, the target heating power of the electromagnetic heating system is obtained; then judging whether the target heating power is smaller than the preset power; if the target heating power is smaller than the preset power, a first driving voltage of a first preset time, a second driving voltage of a second preset time and a first driving voltage of a third preset time are sequentially provided to a power switch tube in the electromagnetic heating system in each switching-on control period, so that continuous low-power heating can be realized, pulse current when the power switch tube is switched on can be effectively inhibited, and cooking experience of a user is improved.
In addition, fig. 7 is a block schematic diagram of a control device of an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 7, the control device of an electromagnetic heating system according to an embodiment of the present invention includes: a drive unit 10, an acquisition unit 20 and a control unit 30.
The driving unit 10 is connected with a control end of a power switch tube 40 in the electromagnetic heating system to drive the power switch tube 40; the obtaining unit 20 is used for obtaining a target heating power W1 of the electromagnetic heating system; the control unit 30 is respectively connected to the obtaining unit 20 and the driving unit 10, and the control unit 30 is configured to determine whether the target heating power W1 is less than a preset power W2, and control the driving unit 10 to sequentially provide a first driving voltage V1 for a first preset time T1, a second driving voltage V2 for a second preset time T2, and a first driving voltage V1 for a third preset time T3 to the power switch tube 40 in the electromagnetic heating system in each on control cycle when the target heating power W1 is less than the preset power W2, where the first driving voltage V1 is less than the second driving voltage V2.
That is, when the target heating power W1 is less than the preset power W2, the electromagnetic heating system will perform low-power heating, and at this time, as shown in fig. 5 and fig. 6, the power switch tube may be driven in a convex manner, that is, in each on control period of the power switch tube, the power switch tube is first driven by the first driving voltage V1 to operate in an amplification state, so as to effectively suppress the pulse current when the power switch tube is on, and after the first preset time T1, the power switch tube is driven by the second driving voltage V2 to operate in a saturated conduction state, that is, the power switch tube is normally on, and after the second preset time T2, the power switch tube is driven by the first driving voltage V1 for the third preset time T3 to operate the power switch tube in the amplification state.
According to an embodiment of the present invention, the control unit 30 is further configured to control the driving unit 10 to continuously provide the second driving voltage V2 to the power switch tube 40 every turn-on control period when the target heating power W1 is greater than or equal to the preset power W2.
According to an embodiment of the present invention, the first driving voltage V1 is equal to or greater than 5V and equal to or less than 14.5V, and the second driving voltage V2 is equal to or greater than 15V.
According to an embodiment of the present invention, the first preset time T1 is greater than or equal to 0.5us and less than or equal to 5us, and the third preset time T3 is less than or equal to 5 us.
For example, as shown in fig. 5 and fig. 6, the preset power is W2, for example, 1000W, when the user selects the porridge cooking mode of the electromagnetic heating system, assuming that the target heating power corresponding to the porridge cooking mode is W1, for example, 800W, the obtaining unit 20 obtains the current target heating power W1 as 800W, and the control unit 30 determines that the current target heating power W1 is smaller than the preset power W2, and further, in each turn-on control period, the control unit 30 may first control the driving unit 10 to provide the first driving voltage V1, for example, 9V to the power switching tube, for example, the IGBT, and when the IGBT is driven by the voltage of 9V, the IGBT operates in the amplification state, and the C pole current of the IGBT is constantly set to be about 22A, so as to effectively suppress the pulse current. And after the first preset time T1, for example, 2us, is driven by the first driving voltage V1, the control unit 30 controls the driving unit 10 to provide the second driving voltage V2, for example, 15V, to the power switch tube, and after the second preset time T2 is driven by the second driving voltage V2, the control unit 30 controls the driving unit 10 to provide the first driving voltage V1, for example, 9V, to the power switch tube for the third preset time T3, for example, 5us, so that the control unit 30 can control the electromagnetic heating system to perform continuous low power heating according to the control method of the foregoing embodiment, thereby avoiding the problems of bottom-up and overflow caused by intermittent heating.
When the user selects the hot pot mode of the electromagnetic heating system, assuming that the target heating power corresponding to the hot pot mode is W1 ', for example, 2000W, the obtaining unit 20 obtains the current target power W1 ' as 2000W, and the control unit 30 determines that the target power W1 ' is greater than the preset power W2, and then in each turn-on control period, the second driving voltage V2, for example, 15V, may be directly provided to the power switch tube 10 to drive the power switch tube 10 to be normally turned on.
According to the control device of the electromagnetic heating system provided by the embodiment of the invention, the target heating power of the electromagnetic heating system is obtained through the obtaining unit, then the control unit judges whether the target heating power is smaller than the preset power, and when the target heating power is smaller than the preset power, the control driving unit sequentially provides the first driving voltage for the first preset time, the second driving voltage for the second preset time and the first driving voltage for the third preset time to the power switch tube in the electromagnetic heating system in each switching control period, so that continuous low-power heating can be realized, the pulse current when the power switch tube is switched on can be effectively inhibited, and the cooking experience of a user is improved.
In addition, the embodiment of the invention also provides an electromagnetic heating system.
Fig. 8 is a block schematic diagram of an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 8, the electromagnetic heating system 50 includes: the control device 60 of the electromagnetic heating system of the above embodiment.
According to a specific example of the present invention, the electromagnetic heating system is an electromagnetic oven, an electromagnetic rice cooker, an electromagnetic pressure cooker, or the like.
According to the electromagnetic heating system provided by the embodiment of the invention, through the control device arranged in the electromagnetic heating system, continuous low-power heating can be realized, meanwhile, the pulse current when the power switch tube is switched on is effectively inhibited, and the cooking experience of a user is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method of controlling an electromagnetic heating system, comprising the steps of:
acquiring target heating power of an electromagnetic heating system;
judging whether the target heating power is smaller than a preset power or not;
if the target heating power is smaller than the preset power, sequentially providing a first driving voltage for a first preset time, a second driving voltage for a second preset time and the first driving voltage for a third preset time to a power switch tube in the electromagnetic heating system in each switching-on control period, wherein the first driving voltage is smaller than the second driving voltage.
2. The control method of an electromagnetic heating system according to claim 1, wherein if the target heating power is equal to or greater than the preset power, the second driving voltage is continuously supplied to the power switching tube at each on control period.
3. The control method of an electromagnetic heating system according to claim 1, wherein the first drive voltage is equal to or greater than 5V and equal to or less than 14.5V, and the second drive voltage is equal to or greater than 15V.
4. The control method of an electromagnetic heating system according to claim 1, characterized in that the first preset time is 0.5us or more and 5us or less, and the third preset time is 5us or less.
5. A control device for an electromagnetic heating system, comprising:
the driving unit is connected with a control end of a power switch tube in the electromagnetic heating system so as to drive the power switch tube;
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring target heating power of the electromagnetic heating system;
the control unit is used for judging whether the target heating power is smaller than the preset power or not, and controlling the driving unit to sequentially provide a first driving voltage for a first preset time, a second driving voltage for a second preset time and a first driving voltage for a third preset time to the power switch tube in the electromagnetic heating system in each switching-on control period when the target heating power is smaller than the preset power, wherein the first driving voltage is smaller than the second driving voltage.
6. The control device of the electromagnetic heating system according to claim 5, wherein the control unit is further configured to control the driving unit to continuously provide the second driving voltage to the power switch tube at each on control period when the target heating power is greater than or equal to the preset power.
7. The control device of an electromagnetic heating system according to claim 5, wherein the first drive voltage is equal to or greater than 5V and equal to or less than 14.5V, and the second drive voltage is equal to or greater than 15V.
8. The control device of an electromagnetic heating system according to claim 5, characterized in that the first preset time is equal to or greater than 0.5us and equal to or less than 5us, and the third preset time is equal to or less than 5 us.
9. An electromagnetic heating system, characterized by comprising a control device of an electromagnetic heating system according to any one of claims 5-8.
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| JP2011228030A (en) * | 2010-04-16 | 2011-11-10 | Hitachi Appliances Inc | Induction heating cooker |
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| CN205546010U (en) * | 2016-02-02 | 2016-08-31 | 佛山市顺德区美的电热电器制造有限公司 | Drive circuit of power switch pipe among electromagnetic heating device and electromagnetic heating device |
| CN205430653U (en) * | 2016-02-02 | 2016-08-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and heating control circuit thereof |
| CN205430652U (en) * | 2016-02-02 | 2016-08-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and heating control circuit thereof |
| CN205544904U (en) * | 2016-02-02 | 2016-08-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and drive circuit of power switch pipe thereof |
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| JP2011228030A (en) * | 2010-04-16 | 2011-11-10 | Hitachi Appliances Inc | Induction heating cooker |
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