CN106162965B - Electromagnetic heating device and resonant circuit thereof - Google Patents
Electromagnetic heating device and resonant circuit thereof Download PDFInfo
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- CN106162965B CN106162965B CN201510162004.4A CN201510162004A CN106162965B CN 106162965 B CN106162965 B CN 106162965B CN 201510162004 A CN201510162004 A CN 201510162004A CN 106162965 B CN106162965 B CN 106162965B
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Abstract
The invention discloses a resonance circuit of an electromagnetic heating device, which comprises: the emitting electrode of the resonance switch tube is grounded; the resonance module comprises a first resonance coil, a second resonance coil, a first resonance capacitor, a second resonance capacitor and a change-over switch, wherein the first resonance coil is connected with the first resonance capacitor in parallel, the second resonance coil is connected with the second resonance capacitor in parallel, the first resonance coil and the first resonance capacitor which are connected in parallel are connected with a collector of a resonance switch tube after being connected with the second resonance coil and the second resonance capacitor which are connected in parallel in series, and the change-over switch is connected with the second resonance capacitor in parallel; and the controller is used for changing the resonant frequency of the electromagnetic heating device by controlling the change-over switch. The resonant circuit of the electromagnetic heating device 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 and a change-over switch, wherein the first resonance coil is connected with the first resonance capacitor in parallel, the second resonance coil is connected with the second resonance capacitor in parallel, the first resonance coil and the first resonance capacitor which are connected in parallel are connected with the second resonance coil and the second resonance capacitor which are connected in parallel in series and then are connected with a collector electrode of the resonance switch tube, and the change-over switch is connected with the second resonance capacitor in parallel; and the controller is connected with the control end of the change-over switch, and the controller changes the resonant frequency of the electromagnetic heating device by controlling the change-over switch.
According to the resonant circuit of the electromagnetic heating device, the first resonant coil and the first resonant capacitor which are connected in parallel are connected in series with the second resonant coil and the second resonant capacitor which are connected in parallel and then are connected with the collector of the resonant switching tube, and the change-over switch is connected in parallel with the second resonant capacitor, so that the topological structure of the resonant circuit can be changed by controlling the on and off of the change-over switch by the controller, the resonant capacitor and the resonant inductor which are used for carrying out resonant work are reduced, 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 damage of the resonant switching tube is avoided, and the circuit can work safely and reliably. In addition, the resonant frequency of the electromagnetic heating device is changed by reducing the resonant capacitance and the resonant inductance for carrying out resonant operation, so that 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 the switching 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 change-over switch to be switched off, the first resonance coil and the first resonance capacitor are connected in parallel and then connected in series with the second resonance coil and the second resonance capacitor which are connected in parallel to perform resonance work.
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 changeover switch is closed, the electromagnetic heating apparatus is operated in an inner ring heating manner for low power heating; when the change-over switch is switched off, the electromagnetic heating device operates in an inner ring and outer ring simultaneous heating mode to perform high-power heating.
In some embodiments of the present invention, the 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 topological structure of the resonant circuit can be changed by controlling the on and off of the change-over switch, and the resonant capacitance and the resonant inductance for resonant work are reduced, so that 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 damage of the resonant switching tube is avoided, and the circuit can work safely and reliably. In addition, the resonant frequency of the electromagnetic heating device is changed by reducing the resonant capacitance and the resonant inductance for carrying out resonant operation, so that 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 when a changeover switch S1 is turned off according to an embodiment of the present invention; and
fig. 2 is a circuit diagram of a resonant circuit of the electromagnetic heating apparatus when the changeover switch S1 is closed according to one 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: the circuit comprises a first resonant coil L1, a first resonant capacitor C1, a second resonant coil L2, a second resonant capacitor C2 and a change-over switch S1.
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.
The emitter of the resonant switching tube 10 is grounded, the resonant module 30 includes a first resonant coil L1, a second resonant coil L2, a first resonant capacitor C1, a second resonant capacitor C2, and a change-over switch S1, the first resonant coil L1 is connected in parallel with the first resonant capacitor C1, the second resonant coil L2 is connected in parallel with the second resonant capacitor C2, the parallel first resonant coil L1 and the parallel first resonant capacitor C1 are connected in series with the parallel second resonant coil L2 and the parallel second resonant capacitor C2 and then connected with the collector of the resonant switching tube 10, and the change-over switch S1 is connected in parallel with the second resonant capacitor C2.
That is, in the parallel resonant topology of the embodiment of the present invention, the change-over switch S1, the second resonant capacitor C2, and the second resonant coil L2 are added, and the change-over switch S1, the second resonant capacitor C2, and the second resonant coil L2 are connected in parallel, and then connected in series with the first resonant coil L1 and the first resonant capacitor C1 connected in parallel.
As shown in fig. 1, the controller 20 is connected to a control terminal of the switch S1, and the controller 20 controls the switch S1 to change the resonant frequency of the electromagnetic heating device.
According to an embodiment of the present invention, as shown in fig. 1 or fig. 2, 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, a collector of the resonant switch tube 10, that is, a C pole of the IGBT, a G pole of the IGBT is connected to the controller 20, and the controller 20 controls the IGBT to be turned on and off by outputting a pulse width modulation PWM signal.
In the embodiment of the present invention, when the controller 20 controls the switch S1 to be closed, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel to perform a resonant operation, as shown in fig. 2 in particular; when the controller 20 controls the switch S1 to be turned off, the first resonant coil L1 is connected in parallel with the first resonant capacitor C1, and then connected in series with the second resonant coil L2 and the second resonant capacitor C2, which are connected in parallel, to perform a resonant operation, as shown in fig. 1. That is to say, the resonant circuit of the electromagnetic heating apparatus according to the embodiment of the present invention changes the resonant inductance and the resonant capacitance participating in the resonant operation in the resonant module 30 by controlling the opening and closing of the transfer switch S1, wherein, under the condition of S1 being open, L1 is connected in parallel with C1, L2 is connected in parallel with C2, and then L1 and C1 connected in parallel are connected in series with L2 and C2 connected in parallel and participate in the resonant operation together; under the condition that S is closed, L2 and C2 are in a short circuit state and do not work, and only L1 and C1 are connected in parallel to participate in resonant operation.
According to an example of the present invention, the first resonance coil L1 and the second resonance coil L2 are both generally coil disks, such as inner and outer loop coil disks. Among them, 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 the changeover switch S1 is closed, the electromagnetic heating device is operated in the inner-loop heating manner for low-power heating; when the changeover switch S1 is turned off, the electromagnetic heating device is operated in the inner and outer ring simultaneous heating manner to perform high power heating.
That is, when the switch S1 is turned off, the parallel L1 and C1 and the parallel L2 and C2 are connected in series and then participate in the resonant operation, so that the resonant circuit can operate in a high-power state, i.e., the electromagnetic heating device performs high-power heating in an inner-outer ring heating manner; when the change-over switch S1 is closed, only the L1 and the C1 are connected in parallel to participate in the resonance work, the resonance frequency is changed, the leading voltage of a resonance switch tube such as an IGBT when being switched on can be well reduced, the temperature rise of the IGBT is reduced, the resonance circuit can be enabled to operate in a low-power state, namely the electromagnetic heating device performs low-power heating in an inner ring heating mode, and therefore the heating power range of the electromagnetic heating device can be widened.
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 operate certain low-power (for example, 500W) heating or inner-ring heating, the main control chip controls the switch S1 to be closed, and the resonant circuit operates in a mode that the L1 and the C1 are connected in parallel 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 change-over switch S1 to be switched off, and the resonant circuit operates in a mode that the parallel L1 and C1 are connected with the parallel L2 and C2 in series and then participate in resonance together.
As shown in fig. 1 or fig. 2, 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 change-over switch can be a high-power relay, a MOS (metal oxide semiconductor) tube, a silicon controlled rectifier or an IGBT.
In summary, the resonant circuit of the electromagnetic heating apparatus according to the embodiment of the invention changes the topology structure by controlling the on and off of the transfer switch, 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 first resonant capacitor which are connected in parallel are connected in series with the second resonant coil and the second resonant capacitor which are connected in parallel and then are connected with the collector of the resonant switching tube, and the change-over switch is connected in parallel with the second resonant capacitor, so that the topological structure of the resonant circuit can be changed by controlling the on and off of the change-over switch by the controller, the resonant capacitor and the resonant inductor which are used for carrying out resonant work are reduced, 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 damage of the resonant switching tube is avoided, and the circuit can work safely and reliably. In addition, the resonant frequency of the electromagnetic heating device is changed by reducing the resonant capacitance and the resonant inductance for carrying out resonant operation, so that 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 topological structure of the resonant circuit can be changed by controlling the on and off of the change-over switch, and the resonant capacitance and the resonant inductance for resonant work are reduced, so that 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 damage of the resonant switching tube is avoided, and the circuit can work safely and reliably. In addition, the resonant frequency of the electromagnetic heating device is changed by reducing the resonant capacitance and the resonant inductance for carrying out resonant operation, so that 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 (6)
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 and a change-over switch, wherein the first resonance coil is connected with the first resonance capacitor in parallel, the second resonance coil is connected with the second resonance capacitor in parallel, the first resonance coil and the first resonance capacitor which are connected in parallel are connected with the second resonance coil and the second resonance capacitor which are connected in parallel in series and then are connected with a collector electrode of the resonance switch tube, and the change-over switch is connected with the second resonance capacitor in parallel; and
a controller connected to a control terminal of the changeover switch, the controller changing a resonant frequency of the electromagnetic heating apparatus by controlling the changeover switch, wherein,
when the controller controls the switching 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 change-over switch to be switched off, the first resonance coil is connected with the first resonance capacitor in parallel and then connected with the second resonance coil and the second resonance capacitor in parallel in series to perform resonance work,
the first resonance coil corresponds to an inner ring of the electromagnetic heating device, the second resonance coil corresponds to an outer ring of the electromagnetic heating device,
when the changeover switch is closed, the electromagnetic heating device is operated in an inner ring heating mode to carry out low-power heating;
when the change-over switch is switched off, the electromagnetic heating device operates in an inner ring and outer ring simultaneous heating mode to perform high-power heating.
2. The resonant circuit of an electromagnetic heating device according to claim 1, wherein the changeover switch is a relay, a MOS transistor, a thyristor, or an IGBT.
3. A resonant circuit of an electromagnetic heating apparatus according to claim 1, wherein the resonant switching tube is an IGBT.
4. 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.
5. An electromagnetic heating device, characterized by comprising a resonant circuit of an electromagnetic heating device according to any one of claims 1-4.
6. The electromagnetic heating device according to claim 5, 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 |
|---|---|---|---|
| CN201510162004.4A CN106162965B (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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| CN201510162004.4A CN106162965B (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heating device and resonant circuit thereof |
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| CN106162965A CN106162965A (en) | 2016-11-23 |
| CN106162965B true CN106162965B (en) | 2019-12-27 |
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| CN109870616B (en) * | 2017-12-05 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Peak value taking circuit, control circuit, cooking utensil and method for judging type of cookware |
Citations (2)
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| CN2822091Y (en) * | 2005-09-02 | 2006-09-27 | 深圳市拓邦电子科技股份有限公司 | Electromagnetic oven resonant circuit for realizing continuous low power to high power output |
| CN104284465A (en) * | 2013-07-11 | 2015-01-14 | 美的集团股份有限公司 | Intelligent control method of convection heating of multiple electromagnetic heating units and electromagnetic heating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0823492A3 (en) * | 1996-08-07 | 1999-01-20 | Concept Systems Design Inc. | Zone heating system with feedback control |
| JP2003017237A (en) * | 2001-06-28 | 2003-01-17 | Harison Toshiba Lighting Corp | Induction heating roller device, fixing device and image forming device |
| JP5658692B2 (en) * | 2010-01-20 | 2015-01-28 | パナソニックＩｐマネジメント株式会社 | Induction heating device |
| JP2012038621A (en) * | 2010-08-09 | 2012-02-23 | Mitsui Eng & Shipbuild Co Ltd | Induction heater and method for induction heating |
| CN204539508U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and resonant circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2822091Y (en) * | 2005-09-02 | 2006-09-27 | 深圳市拓邦电子科技股份有限公司 | Electromagnetic oven resonant circuit for realizing continuous low power to high power output |
| CN104284465A (en) * | 2013-07-11 | 2015-01-14 | 美的集团股份有限公司 | Intelligent control method of convection heating of multiple electromagnetic heating units and electromagnetic heating device |
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