CN106162969B - Electromagnetic heating device and resonant circuit thereof - Google Patents
Electromagnetic heating device and resonant circuit thereof Download PDFInfo
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- CN106162969B CN106162969B CN201510164454.7A CN201510164454A CN106162969B CN 106162969 B CN106162969 B CN 106162969B CN 201510164454 A CN201510164454 A CN 201510164454A CN 106162969 B CN106162969 B CN 106162969B
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Abstract
The invention discloses a resonance circuit of an electromagnetic heating device, which comprises: a resonant switching tube; the resonance module comprises a first resonance coil, a second resonance coil, a first resonance capacitor, a second resonance capacitor, a first change-over switch and a second change-over switch, wherein the first resonance coil and the second resonance coil are connected in series; and the controller is used for changing the resonant frequency of the electromagnetic heating device by controlling the first change-over switch and the second change-over switch. The resonant circuit can change the resonant frequency of the electromagnetic heating device, reduce the leading voltage when the resonant switch tube is switched on, and reduce the temperature rise of the resonant switch tube. The invention also discloses an electromagnetic heating device.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to a resonant circuit of an electromagnetic heating device and the electromagnetic heating device with the resonant circuit.
Background
At present, a single IGBT (Insulated Gate Bipolar Transistor) electromagnetic resonance circuit generally adopts a parallel resonance mode, and when a resonance parameter is adopted for realizing high power, if the circuit is operated in a continuous low-power section, the following problems may occur:
(1) the IGBT is switched on in advance, and the transient current peak value of the IGBT is high at the moment of switching on and easily exceeds the specification limit of the current peak value of the IGBT, so that the IGBT is damaged;
(2) the IGBT generates heat severely, and the heat dissipation of the IGBT (such as increasing the heat dissipation fins, increasing the rotational speed of the fan, etc.) needs to be enhanced to meet the temperature rise requirement of the IGBT.
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, an object of the present invention is to provide a resonant circuit of an electromagnetic heating device, which can change the resonant frequency of the electromagnetic heating device, reduce the leading voltage when the resonant switch tube is turned on, and reduce the temperature rise of the resonant switch tube.
Another object of the present invention is to provide an electromagnetic heating device.
In order to achieve the above object, a resonant circuit of an electromagnetic heating apparatus according to an embodiment of the present invention includes: the emitter of the resonant switching tube is grounded; the resonance module comprises a first resonance coil, a second resonance coil, a first resonance capacitor, a second resonance capacitor, a first change-over switch and a second change-over switch, wherein the first resonance coil and the second resonance coil are connected in series, the first resonance capacitor and the second resonance capacitor are connected in series, the first resonance coil and the second resonance coil which are connected in series are connected with a collector of the resonance switch tube after being connected with the first resonance capacitor and the second resonance capacitor which are connected in series in parallel, the first change-over switch and the second resonance coil are connected in parallel, and the second change-over switch and the second resonance capacitor are connected in parallel; the controller is connected with the base electrode of the resonance switch tube to control the on and off of the resonance switch tube, the controller is also connected with the control end of the first change-over switch and the control end of the second change-over switch respectively, and the controller changes the resonance frequency of the electromagnetic heating device by controlling the first change-over switch and the second change-over switch.
According to the resonant circuit of the electromagnetic heating device, the first resonant coil and the second resonant coil which are connected in series in the resonant module are connected with the first resonant capacitor and the second resonant capacitor which are connected in series in parallel and then connected with the collector of the resonant switching tube, the first change-over switch is connected with the second resonant coil in parallel, and the second change-over switch is connected with the second resonant capacitor in parallel, so that the controller can increase or decrease the resonant capacitor and the resonant inductor which perform resonant work by controlling the on and off of the first change-over switch and the second change-over switch, the topological structure of the resonant circuit is changed, the purpose of changing the resonant frequency is achieved, the leading voltage when the resonant switching tube is switched on can be well reduced, the temperature rise of the resonant switching tube is reduced, the resonant switching tube is prevented from being damaged, and the circuit can work safely and reliably. In addition, by changing the resonant frequency of the electromagnetic heating device, the continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is widened.
According to an embodiment of the present invention, when the controller controls both the first changeover switch and the second changeover switch to be closed, the first resonance coil and the first resonance capacitor are connected in parallel to perform a resonance operation; when the controller controls the first change-over switch to be switched off and controls the second change-over switch to be switched on, the first resonance coil and the second resonance coil are connected in series and then connected in parallel with the first resonance capacitor to perform resonance work; when the controller controls the first change-over switch to be closed and controls the second change-over switch to be opened, the first resonance coil is connected with the first resonance capacitor and the second resonance capacitor which are connected in series in parallel to perform resonance operation; when the controller controls the first change-over switch and the second change-over switch to be switched off, the first resonance coil and the second resonance coil which are connected in series are connected in parallel with the first resonance capacitor and the second resonance capacitor which are connected in series to perform resonance operation.
According to an embodiment of the present invention, the first resonance coil corresponds to an inner ring of the electromagnetic heating apparatus, and the second resonance coil corresponds to an outer ring of the electromagnetic heating apparatus, wherein when the first changeover switch and the second changeover switch are both closed, the electromagnetic heating apparatus operates in the inner ring heating manner to perform the first high power heating; when the first change-over switch is switched off and the second change-over switch is switched off, the electromagnetic heating device is operated in a heating mode of the inner ring and the outer ring to perform second high-power heating; when the first change-over switch is closed and the second change-over switch is opened, the electromagnetic heating device is operated in the inner ring heating mode to perform first low-power heating; when the first change-over switch and the second change-over switch are both off, the electromagnetic heating device is operated in the inner ring and the outer ring heating mode to perform second low-power heating. Therefore, the inner ring can be independently heated at high power or low power, and the inner ring and the outer ring can be simultaneously heated at high power or low power, so that the heating area and the heating power can be changed in a wider range.
In some embodiments of the present invention, the first transfer switch and the second transfer switch may be a relay, a MOS transistor, a thyristor, or an IGBT.
According to an embodiment of the present invention, the resonant switching tube may be an IGBT.
According to an embodiment of the present invention, the electromagnetic heating device further includes a filter module, the filter module is connected between a power supply and the resonance module, the filter module includes a filter inductor and a filter capacitor, one end of the filter inductor is connected to the power supply, the other end of the filter inductor is connected to one end of the filter capacitor, the other end of the filter capacitor is grounded, a first node is provided between the other end of the filter inductor and one end of the filter capacitor, and the first node is connected to the resonance module.
In addition, the embodiment of the invention also provides an electromagnetic heating device which comprises the resonant circuit of the electromagnetic heating device.
According to the electromagnetic heating device provided by the embodiment of the invention, the resonant capacitance and the resonant inductance for carrying out resonant work can be increased or decreased by controlling the on/off of the first change-over switch and the second change-over switch in the resonant module, and the topological structure of the resonant circuit is changed, so that the purpose of changing the resonant frequency is achieved, the leading voltage when the resonant switch tube is switched on can be well reduced, the temperature rise of the resonant switch tube is reduced, the damage of the resonant switch tube is avoided, and the circuit can work safely and reliably. In addition, by changing the resonant frequency of the electromagnetic heating device, the continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is widened.
Wherein, the electromagnetic heating device can comprise an electromagnetic rice cooker, an electromagnetic pressure cooker and an electromagnetic oven.
Drawings
Fig. 1 is a circuit diagram of a resonant circuit of an electromagnetic heating apparatus according to an embodiment of the present invention; and
fig. 2 is a diagram of components participating in resonance in four heating modes of the electromagnetic heating apparatus according to an embodiment of the present invention.
Reference numerals:
the resonant circuit 100: the resonant switching tube 10, the controller 20 and the resonant module 30;
the filtering module 200: a filter inductor L0, a filter capacitor C0;
the resonance module 30: a first resonance coil L1, a first resonance capacitor C1, a second resonance coil L2, a second resonance capacitor C2, a first change-over switch S1 and a second change-over switch S2.
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 resonant circuit of an electromagnetic heating apparatus and an electromagnetic heating apparatus having the resonant circuit according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a resonance circuit of an electromagnetic heating apparatus according to an embodiment of the present invention. As shown in fig. 1, the resonant circuit 100 of the electromagnetic heating apparatus includes: a resonant switching tube 10, a controller 20 and a resonant module 30.
Wherein, the emitter of the resonant switching tube 10 is grounded, the resonant module 30 includes a first resonant coil L1 and a second resonant coil L2, a first resonant capacitor C1 and a second resonant capacitor C2, a first change-over switch S1 and a second change-over switch S2, the first resonant coil L1 and the second resonant coil L2 are connected in series, the first resonant capacitor C1 and the second resonant capacitor C2 are connected in series, the first resonant coil L1 and the second resonant coil L2 connected in series are connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series and then connected with the collector of the resonant switching tube 10, the first change-over switch S1 is connected in parallel with the second resonant coil L2, and the second change-over switch S2 is connected in parallel with the second resonant capacitor C2.
That is, in the parallel resonant topology of the embodiment of the present invention, a first change-over switch S1, a second change-over switch S2, a second resonant capacitor C2 and a second resonant coil L2 are added, and after the first resonant coil L1 and the second resonant coil L2 connected in series are connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series, the first change-over switch S1 is connected in parallel with the second resonant coil L2 to control the second resonant coil L2, and the second change-over switch S2 is connected in parallel with the second resonant capacitor C2 to control the second resonant capacitor C2.
As shown in fig. 1, the controller 20 is connected to the base of the resonant switching tube 10 to control the on/off of the resonant switching tube 10, the controller 20 is further connected to the control terminal of the first switch S1 and the control terminal of the second switch S2, respectively, and the controller 20 controls the first switch S1 and the second switch S2 to change the resonant frequency of the electromagnetic heating apparatus.
According to an embodiment of the present invention, as shown in fig. 1, the resonant switch tube 10 may be an IGBT, that is, an emitter of the resonant switch tube 10, that is, an E pole of the IGBT, and a collector of the resonant switch tube 10, that is, a C pole of the IGBT, and a G pole of the IGBT is connected to the controller 20, and the controller 20 controls on and off of the IGBT by outputting a pulse width modulation PWM signal.
In the embodiment of the present invention, when the controller 20 controls both the first changeover switch S1 and the second changeover switch S2 to be closed, the first resonance coil L1 and the first resonance capacitor C1 are connected in parallel to perform a resonance operation; when the controller 20 controls the first switch S1 to be turned off and controls the second switch S2 to be turned on, the first resonant coil L1 and the second resonant coil L2 are connected in series and then connected in parallel with the first resonant capacitor C1 to perform a resonant operation; when the controller 20 controls the first switch S1 to be closed and controls the second switch S2 to be opened, the first resonant coil L1 is connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series to perform a resonant operation; when the controller 20 controls both the first and second changeover switches S1 and S2 to be turned off, the first and second resonant coils L1 and L2 connected in series are connected in parallel with the first and second resonant capacitors connected in series to perform a resonant operation.
Among them, according to an example of the present invention, the first resonance coil L1 and the second resonance coil L2 are generally coil disks, such as an inner and outer ring coil disk. Also, the first resonance coil L1 may correspond to an inner ring of the electromagnetic heating device, i.e., an inner ring coil disk, and the second resonance coil may correspond to an outer ring of the electromagnetic heating device, i.e., an outer ring coil disk. Then, when both the first and second changeover switches S1 and S2 are closed, the electromagnetic heating device is operated in the first inner-loop heating mode to perform the first high power heating, i.e., the electromagnetic heating device is operated in the single-loop high power heating mode; when the first change-over switch S1 is turned off and the second change-over switch S2 is turned on, the electromagnetic heating device is operated in the first inner and outer ring heating manner to perform the second high power heating, i.e., the electromagnetic heating device is operated in the double ring high power heating mode; when the first transfer switch S1 is closed and the second transfer switch S2 is open, the electromagnetic heating device is operated in the second inner loop heating mode to perform the first low power heating, i.e., the electromagnetic heating device is operated in the single loop low power heating mode; when both the first changeover switch S1 and the second changeover switch S2 are turned off, the electromagnetic heating apparatus is operated in the second inner and outer ring heating manner to perform the second low power heating, that is, the electromagnetic heating apparatus is operated in the double ring low power heating mode.
Specifically, as shown in fig. 2, the electromagnetic heating device has four heating modes, i.e., a mode one, a mode two, a mode three, and a mode four, and the switching between the four modes is realized by controlling the opening and closing of the first transfer switch S1 and the second transfer switch S2 to change the resonant inductance and the resonant capacitance involved in the resonant operation in the resonant module 30, so that the high-power, low-power, single-loop and double-loop heating mode operation of the electromagnetic heating device can be realized.
The first switch S1 controls the second resonant coil to be turned on or off, so that the first switch S1 controls the electromagnetic heating device to operate in a single-loop or double-loop heating manner. Because the first resonant capacitor C1 and the second resonant capacitor C2 are connected in series, the resonant capacitance value is reduced after the series connection, the leading voltage of the resonant switch tube such as an IGBT when being switched on can be reduced, the temperature rise of the IGBT is reduced, and the whole circuit stably operates in a low power state, so that the second change-over switch S2 controls the high and low power operation state of the electromagnetic heating device. Therefore, by the combined control of the first change-over switch S1 and the second change-over switch S2, the single-loop and double-loop high-power and low-power operation of the electromagnetic heating device can be realized.
As shown in fig. 2, mode one corresponds to a dual loop low power heating mode, where both S1 and S2 are open and the elements participating in resonance are L1, C1, L2, C2; the second mode corresponds to a double-ring high-power heating mode, wherein S1 is open, S2 is closed, and elements participating in resonance are L1, C1 and L2; mode three corresponds to a single loop low power heating mode, where S1 is closed and S2 is open, and the elements participating in resonance are L1, C1, and C2; mode four corresponds to a single loop high power heating mode, where both S1 and S2 are closed and the elements participating in resonance are L1, C1. In fig. 2, 0 indicates that the switch is open, and 1 indicates that the switch is closed.
Therefore, in the embodiment of the invention, the operation of the electromagnetic heating device in multiple heating modes can be realized, the heating power range of the electromagnetic heating device is widened, and the selected space is increased.
Specifically, in one example of the present invention, when the heating power is lower than or equal to 1000W, the main control chip, i.e., the controller 20, of the electromagnetic heating apparatus defaults to the low power state, and otherwise, it is in the high power state. When the user operates the electromagnetic heating device to perform heating with a certain small power (for example, 500W) or inner loop heating, the main control chip controls the first switch S1 to be closed and the second switch S2 to be opened, and the resonant circuit operates in such a manner that the first resonant coil L1 is connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 which are connected in series to participate in resonance. When a user operates the electromagnetic heating device to operate certain high-power (for example 2000W) heating or inner and outer ring heating, the main control chip controls the first change-over switch S1 to be opened and the second change-over switch S2 to be closed, and the resonant circuit operates in a mode that the first resonant coil L1 is connected in series with the second resonant coil L2 and then connected in parallel with the first resonant capacitor C1 to participate in resonance.
As shown in fig. 1, the electromagnetic heating apparatus further includes a filtering module 200 composed of a filtering inductor L0 and a filtering capacitor C0, and configured to perform filtering and voltage stabilizing processing on a 310V power supply. The filter module 200 is connected between the power supply and the resonance module 30, the filter module 200 includes a filter inductor L0 and a filter capacitor C0, one end of the filter inductor L0 is connected to the power supply, the other end of the filter inductor L0 is connected to one end of the filter capacitor C0, the other end of the filter capacitor C0 is grounded, a first node is provided between the other end of the filter inductor L0 and one end of the filter capacitor C0, and the first node is connected to the resonance module 30.
In the embodiment of the invention, the first change-over switch and the second change-over switch can be high-power relays, MOS tubes, thyristors or IGBTs.
In summary, the resonant circuit of the electromagnetic heating apparatus according to the embodiment of the present invention changes the topology structure by controlling the on and off of the switches S1 and S2, so as to change the resonant frequency of the electromagnetic heating apparatus.
According to the resonant circuit of the electromagnetic heating device, the first resonant coil and the second resonant coil which are connected in series in the resonant module are connected with the first resonant capacitor and the second resonant capacitor which are connected in series in parallel and then connected with the collector of the resonant switching tube, the first change-over switch is connected with the second resonant coil in parallel, and the second change-over switch is connected with the second resonant capacitor in parallel, so that the controller can increase or decrease the resonant capacitor and the resonant inductor which perform resonant work by controlling the on and off of the first change-over switch and the second change-over switch, the topological structure of the resonant circuit is changed, the purpose of changing the resonant frequency is achieved, the leading voltage when the resonant switching tube is switched on can be well reduced, the temperature rise of the resonant switching tube is reduced, the resonant switching tube is prevented from being damaged, and the circuit can work safely and reliably. In addition, by changing the resonant frequency of the electromagnetic heating device, the continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is widened.
In addition, the embodiment of the invention also provides an electromagnetic heating device which comprises the resonant circuit of the electromagnetic heating device.
Wherein, the electromagnetic heating device can comprise an electromagnetic rice cooker, an electromagnetic pressure cooker and an electromagnetic oven.
According to the electromagnetic heating device provided by the embodiment of the invention, the resonant capacitance and the resonant inductance for carrying out resonant work can be increased or decreased by controlling the on/off of the first change-over switch and the second change-over switch in the resonant module, and the topological structure of the resonant circuit is changed, so that the purpose of changing the resonant frequency is achieved, the leading voltage when the resonant switch tube is switched on can be well reduced, the temperature rise of the resonant switch tube is reduced, the damage of the resonant switch tube is avoided, and the circuit can work safely and reliably. In addition, by changing the resonant frequency of the electromagnetic heating device, the continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is widened.
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.
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.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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 (5)
1. A resonant circuit of an electromagnetic heating apparatus, comprising:
the emitter of the resonant switching tube is grounded;
the resonance module comprises a first resonance coil, a second resonance coil, a first resonance capacitor, a second resonance capacitor, a first change-over switch and a second change-over switch, wherein the first resonance coil and the second resonance coil are connected in series, the first resonance capacitor and the second resonance capacitor are connected in series, the first resonance coil and the second resonance coil which are connected in series are connected with a collector of the resonance switch tube after being connected with the first resonance capacitor and the second resonance capacitor which are connected in series in parallel, the first change-over switch and the second resonance coil are connected in parallel, and the second change-over switch and the second resonance capacitor are connected in parallel; and
a controller connected to the base of the resonant switching tube to control the on/off of the resonant switching tube, the controller being further connected to the control terminal of the first transfer switch and the control terminal of the second transfer switch, respectively, the controller changing the resonant frequency of the electromagnetic heating device by controlling the first transfer switch and the second transfer switch, wherein,
when the controller controls the first change-over switch and the second change-over switch to be closed, the first resonance coil and the first resonance capacitor are connected in parallel to perform resonance operation;
when the controller controls the first change-over switch to be switched off and controls the second change-over switch to be switched on, the first resonance coil and the second resonance coil are connected in series and then connected in parallel with the first resonance capacitor to perform resonance work;
when the controller controls the first change-over switch to be closed and controls the second change-over switch to be opened, the first resonance coil is connected with the first resonance capacitor and the second resonance capacitor which are connected in series in parallel to perform resonance operation;
when the controller controls the first change-over switch and the second change-over switch to be switched off, the first resonance coil and the second resonance coil which are connected in series are connected with the first resonance capacitor and the second resonance capacitor which are connected in series in parallel to perform resonance operation;
and the first resonance coil corresponds to an inner ring of the electromagnetic heating apparatus, and the second resonance coil corresponds to an outer ring of the electromagnetic heating apparatus, wherein,
when the first change-over switch and the second change-over switch are both closed, the electromagnetic heating device operates in the inner ring heating mode to perform first high-power heating;
when the first change-over switch is switched off and the second change-over switch is switched off, the electromagnetic heating device is operated in a heating mode of the inner ring and the outer ring to perform second high-power heating;
when the first change-over switch is closed and the second change-over switch is opened, the electromagnetic heating device operates in an inner ring heating mode to perform first low-power heating;
when the first changeover switch and the second changeover switch are both off, the electromagnetic heating device is operated in a heating mode of both the inner ring and the outer ring to perform second low-power heating,
the first change-over switch and the second change-over switch are both relays, MOS tubes, silicon controlled rectifiers or IGBTs.
2. A resonant circuit of an electromagnetic heating apparatus according to claim 1, wherein the resonant switching tube is an IGBT.
3. The resonant circuit of an electromagnetic heating device according to claim 1, further comprising a filter module, wherein the filter module is connected between a power source and the resonant module, the filter module comprises a filter inductor and a filter capacitor, one end of the filter inductor is connected to the power source, the other end of the filter inductor is connected to one end of the filter capacitor, the other end of the filter capacitor is grounded, a first node is provided between the other end of the filter inductor and one end of the filter capacitor, and the first node is connected to the resonant module.
4. An electromagnetic heating device, characterized by comprising a resonant circuit of an electromagnetic heating device according to any one of claims 1-3.
5. The electromagnetic heating device according to claim 4, wherein the electromagnetic heating device comprises an electromagnetic rice cooker, an electromagnetic pressure cooker and an electromagnetic oven.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510164454.7A CN106162969B (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heating device and resonant circuit thereof |
| PCT/CN2015/092983 WO2016161796A1 (en) | 2015-04-07 | 2015-10-27 | Electromagnetic heating device and resonance circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510164454.7A CN106162969B (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heating device and resonant circuit thereof |
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| CN106162969A CN106162969A (en) | 2016-11-23 |
| CN106162969B true CN106162969B (en) | 2019-12-31 |
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