CN106879094B - Electromagnetic heating device and heating control circuit thereof - Google Patents

Electromagnetic heating device and heating control circuit thereof Download PDF

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Publication number
CN106879094B
CN106879094B CN201510918398.1A CN201510918398A CN106879094B CN 106879094 B CN106879094 B CN 106879094B CN 201510918398 A CN201510918398 A CN 201510918398A CN 106879094 B CN106879094 B CN 106879094B
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igbt
coil
utmost point
resonance
selection switch
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CN106879094A (en
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钟石刚
雷俊
李信合
李新峰
吕文灿
刘金明
袁宏斌
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Midea Group Co Ltd
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Midea Group Co Ltd
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

The invention discloses a heating control circuit of an electromagnetic heating device and the electromagnetic heating device with the heating control circuit, wherein the heating control circuit comprises: n resonant capacitors; n power switching tubes; a selection switch; any two coil panels in the N+1 coil panels are combined through a selection switch, and one of the any two coil panels is selected to participate in resonance through the selection switch, wherein the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with N resonance capacitors and N power switch tubes; the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switch tubes. The heating control circuit has fewer components and parts, simple circuit structure, and the selection switch does not need to be frequently switched in the heating control process, so that the service life of the selection switch is greatly prolonged.

Description

Electromagnetic heating device and heating control circuit thereof
Technical Field
The invention relates to the technical field of household appliances, in particular to a heating control circuit of an electromagnetic heating device and the electromagnetic heating device.
Background
In a multi-coil heating circuit structure, a plurality of IGBTs or resonance capacitors are usually connected, and when more than three coils are provided in the heating circuit structure, relay matching is also required. For example, when three coil panels are provided in the heating circuit structure, three IGBTs are required to respectively perform resonance control on the three coil panels, and each coil panel is also connected with a resonance capacitor, so that the circuit structure is complex, the wiring of the coil panel is also complex, and when the relay is adopted for matched heating, the service life of the relay is greatly reduced due to frequent switching of the relay, and meanwhile, the relay generates larger noise in the switching process.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a heating control circuit of an electromagnetic heating apparatus having a simple circuit structure and fewer components.
Another object of the present invention is to provide an electromagnetic heating device.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a heating control circuit of an electromagnetic heating device, including: n resonant capacitors, wherein N is an integer greater than 1; n power switching tubes; a selection switch; the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switch tubes.
According to the heating control circuit of the electromagnetic heating device, the resonant capacitor, the power switch device and the selection switch can be effectively reduced to a certain extent, so that the circuit structure is simpler, the wiring of the coil panels is simpler, the cost is reduced, in addition, the selection switch is only used for selecting one of any two coil panels to participate in resonance, and the N power switch tubes are controlled by the control module to enable N resonant circuits to work in turn, so that the switching times of the selection switch are greatly reduced, and the service life of the selection switch is prolonged.
According to one embodiment of the invention, the selection switch is a relay, a first end of the relay is connected with the power supply module of the electromagnetic heating device, a second end of the relay is connected with a first coil panel of the arbitrary two coil panels, a third end of the relay is connected with a second coil panel of the arbitrary two coil panels, and a control end of the relay is connected with the control module.
According to one embodiment of the present invention, when N is equal to 3, the N resonant capacitors include first to third resonant capacitors, the N power switching transistors include first to third IGBTs, and the n+1 coil disks include first to fourth coil disks.
According to the first embodiment of the invention, one end of a first resonant capacitor is connected with a first end of the relay, the other end of the first resonant capacitor is connected with a second end of the relay through a first coil disc, the other end of the first resonant capacitor is also connected with a C pole of a first IGBT, the C pole of the first IGBT is also connected with a second coil disc, an E pole of the first IGBT is grounded, a G pole of the first IGBT is connected with an IGBT driving unit in the control module, a third coil disc is connected with a C pole of a second IGBT after being connected in parallel with the second resonant capacitor, an E pole of the second IGBT is grounded, a G pole of the second IGBT is connected with the IGBT driving unit, a fourth coil disc is connected with a C pole of a third IGBT after being connected in parallel with the third resonant capacitor, an E pole of the third IGBT is grounded, and a G pole of the third IGBT is connected with the IGBT driving unit.
According to a second embodiment of the present invention, a first coil disc is connected in series with a first resonance capacitor and then grounded, a node between the first coil disc and the first resonance capacitor is connected to a C-pole of a first IGBT, the C-pole of the first IGBT is also connected to a second coil disc, an E-pole of the first IGBT is grounded, a G-pole of the first IGBT is connected to an IGBT driving unit in the control module, a third coil disc is connected in series with a second resonance capacitor and then grounded, a node between the third coil disc and the second resonance capacitor is connected to a C-pole of a second IGBT, an E-pole of the second IGBT is grounded, a G-pole of the second IGBT is connected to the IGBT driving unit, a fourth coil disc is connected in series with a third resonance capacitor and then grounded, a node between the fourth coil disc and the third resonance capacitor is connected to a C-pole of a third IGBT, an E-pole of the third IGBT is grounded, and a G-pole of the third IGBT is connected to the IGBT driving unit.
According to a third embodiment of the present invention, one end of a first resonant capacitor is connected to a first end of the relay, the other end of the first resonant capacitor is connected to a second end of the relay through a first coil disc, the other end of the first resonant capacitor is further connected to a C-pole of a first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, the E-pole of the first IGBT is grounded, the G-pole of the first IGBT is connected to an IGBT driving unit in the control module, the third coil disc is connected to a C-pole of a second IGBT in parallel with the second resonant capacitor, the E-pole of the second IGBT is grounded, the G-pole of the second IGBT is connected to the IGBT driving unit, the fourth coil disc is connected to a third resonant capacitor in series with the C-pole of the third IGBT, the node between the fourth coil disc and the third resonant capacitor is connected to the C-pole of the third IGBT, the E-pole of the third IGBT is grounded, and the G-pole of the third IGBT is connected to the IGBT driving unit.
According to a fourth embodiment of the present invention, a first coil disc is connected in series with a first resonance capacitor and then grounded, a node between the first coil disc and the first resonance capacitor is connected to a C-pole of a first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, an E-pole of the first IGBT is grounded, a G-pole of the first IGBT is connected to an IGBT driving unit in the control module, a third coil disc is connected in parallel with a second resonance capacitor and then connected to a C-pole of a second IGBT, an E-pole of the second IGBT is grounded, a G-pole of the second IGBT is connected to the IGBT driving unit, a fourth coil disc is connected in series with a third resonance capacitor and then grounded, a node between the fourth coil disc and the third resonance capacitor is connected to a C-pole of a third IGBT, an E-pole of the third IGBT is grounded, and a G-pole of the third IGBT is connected to the IGBT driving unit.
According to a fifth embodiment of the present invention, one end of a first resonant capacitor is connected to a first end of the relay, the other end of the first resonant capacitor is connected to a second end of the relay through a first coil disc, the other end of the first resonant capacitor is further connected to a C-pole of the first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, the E-pole of the first IGBT is grounded, the G-pole of the first IGBT is connected to an IGBT driving unit in the control module, the third coil disc is connected to the second resonant capacitor in series and then to ground, a node between the third coil disc and the second resonant capacitor is connected to the C-pole of the second IGBT, the E-pole of the second IGBT is grounded, the G-pole of the second IGBT is connected to the IGBT driving unit, the fourth coil disc is connected to the C-pole of the third IGBT after being connected in parallel, the G-pole of the third IGBT is grounded, and the G-pole of the third IGBT is connected to the IGBT driving unit.
According to a sixth embodiment of the present invention, a first coil disc is connected in series with a first resonance capacitor and then grounded, a node between the first coil disc and the first resonance capacitor is connected to a C-pole of a first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, an E-pole of the first IGBT is grounded, a G-pole of the first IGBT is connected to an IGBT driving unit in the control module, a third coil disc is connected in parallel with a second resonance capacitor and then connected to a C-pole of a second IGBT, an E-pole of the second IGBT is grounded, a G-pole of the second IGBT is connected to the IGBT driving unit, a fourth coil disc is connected in parallel with a third resonance capacitor and then connected to a C-pole of a third IGBT, an E-pole of the third IGBT is grounded, and a G-pole of the third IGBT is connected to the IGBT driving unit.
According to a seventh embodiment of the present invention, one end of a first resonant capacitor is connected to a first end of the relay, the other end of the first resonant capacitor is connected to a second end of the relay through a first coil disc, the other end of the first resonant capacitor is further connected to a C-pole of the first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, the E-pole of the first IGBT is grounded, a G-pole of the first IGBT is connected to an IGBT driving unit in the control module, a third coil disc is connected to the second resonant capacitor in series and then to ground, a node between the third coil disc and the second resonant capacitor is connected to the C-pole of the second IGBT, the E-pole of the second IGBT is grounded, the G-pole of the second IGBT is connected to the IGBT driving unit, the fourth coil disc is connected to the third resonant capacitor in series and then to ground, a node between the fourth coil disc and the third resonant capacitor is connected to the C-pole of the third IGBT, and the third IGBT is connected to the G-pole driving unit.
According to an eighth embodiment of the present invention, a first coil disc is connected in series with a first resonance capacitor and then grounded, a node between the first coil disc and the first resonance capacitor is connected to a C-pole of a first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, an E-pole of the first IGBT is grounded, a G-pole of the first IGBT is connected to an IGBT driving unit in the control module, a third coil disc is connected in series with a second resonance capacitor and then grounded, a node between the third coil disc and the second resonance capacitor is connected to a C-pole of a second IGBT, an E-pole of the second IGBT is grounded, a G-pole of the second IGBT is connected to the IGBT driving unit, a fourth coil disc is connected to a C-pole of a third IGBT after being connected in parallel with a third resonance capacitor, an E-pole of the third IGBT is grounded, and a G-pole of the third IGBT is connected to the IGBT driving unit.
In addition, the embodiment of the invention also provides an electromagnetic heating device, which comprises the heating control circuit of the electromagnetic heating device.
According to the electromagnetic heating device, the use of the resonant capacitor, the power switch device and the selection switch can be effectively reduced to a certain extent through the heating control circuit, so that the circuit structure is simpler, the wiring of the coil panels is simpler, the cost is reduced, in addition, the selection switch is only used for selecting one of any two coil panels to participate in resonance, and the N power switch tubes are controlled by the control module to enable the N resonant circuits to work in turn, therefore, the switching times of the selection switch are greatly reduced, the service life of the selection switch is prolonged, and the stability and reliability of the electromagnetic heating device are further improved.
Drawings
Fig. 1 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a first embodiment of the present invention.
Fig. 2 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a second embodiment of the present invention.
Fig. 3 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a third embodiment of the present invention.
Fig. 4 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a fourth embodiment of the present invention.
Fig. 5 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a fifth embodiment of the present invention.
Fig. 6 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a sixth embodiment of the present invention.
Fig. 7 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to a seventh embodiment of the present invention.
Fig. 8 is a circuit configuration diagram of a heating control circuit of an electromagnetic heating apparatus according to an eighth embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A heating control circuit of an electromagnetic heating apparatus and an electromagnetic heating apparatus according to embodiments of the present invention are described below with reference to the accompanying drawings.
As shown in fig. 1 to 8, a heating control circuit of an electromagnetic heating apparatus according to an embodiment of the present invention includes: n resonant capacitors, N power switching tubes, a selection switch REL, n+1 coil discs and a control module 10.
Wherein N is an integer greater than 1, any two coil panels of the n+1 coil panels are combined through a selection switch REL, one of the any two coil panels is selected to participate in resonance through the selection switch REL, wherein the other N-1 coil panels of the n+1 coil panels and the coil panels selected by the selection switch REL to participate in resonance correspondingly form N resonance circuits with N resonance capacitors and N power switch tubes, and the control module 10 controls the N resonance circuits to work in turn by controlling the selection switch REL and the N power switch tubes.
Specifically, the selection switch REL is only used for selecting one of any two coil panels to participate in resonance, and during the heating control process, the control module 10 controls the selection switch REL and the N power switching tubes to make the N resonant circuits work in turn. For example, in the heating control process, when it is required to use one of the coil disks combined with the selection switch REL, the control module 10 switches the required coil disk into the resonance circuit by controlling the selection switch REL, and then the control module 10 operates in turn by controlling the N resonance circuits to realize the heating function. The control module 10 controls the selection switch REL to switch whenever another one of the coil disks combined with the selection switch REL is required to be heated, thus greatly reducing the switching times of the selection switch REL, improving the service life of the selection switch REL, and greatly reducing noise generated during switching due to the greatly reduced switching times.
It should be noted that each coil panel may be further divided into a plurality of small coil panels, and the plurality of small coil panels are connected in series to realize a function of heating a plurality of portions simultaneously.
According to one embodiment of the invention, the selection switch REL is a relay, a first end of which is connected to the power supply module 20 of the electromagnetic heating device, a second end of which is connected to a first coil of any two coils, a third end of which is connected to a second coil of any two coils, and a control end of which is connected to the control module 10. The power supply module 20 may include a power supply 21 and an LC filter circuit including a filter inductance L and a filter capacitance C.
According to one embodiment of the present invention, when N is equal to 3, the N resonant capacitors include first to third resonant capacitors (sequentially denoted as C1, C2, and C3), the N power switching transistors include first to third IGBTs (sequentially denoted as IGBT1, IGBT2, and IGBT 3), and the n+1 coil disks include first to fourth coil disks (sequentially denoted as L1, L2, L3, and L4).
According to the first embodiment of the present invention, as shown in fig. 1, one end of a first resonant capacitor C1 is connected to a first end of a relay, the other end of the first resonant capacitor C1 is connected to a second end of the relay through a first coil disc L1, the other end of the first resonant capacitor C1 is further connected to a C pole of an IGBT1, the C pole of the IGBT1 is further connected to a second coil disc L2, an E pole of the IGBT1 is grounded GND, a G pole of the IGBT1 is connected to an IGBT driving unit 11 in a control module 10, a third coil disc L3 is connected to the C pole of the IGBT2 in parallel with the second resonant capacitor C2, the E pole of the IGBT2 is grounded GND, a G pole of the IGBT2 is connected to an IGBT driving unit 11 in parallel with a third resonant capacitor C3, the E pole of the IGBT3 is grounded GND, and the G pole of the IGBT3 is connected to the IGBT driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker.
When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, and at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT 1. The control module 10 firstly sends a driving signal of the IGBT1 to the IGBT driving unit 11 to control the IGBT1 to operate, and simultaneously stops outputting driving signals of the IGBT2 and the IGBT3 to turn off the IGBT2 and the IGBT3, and at this time, the first coil disc L1 and the first capacitor C1 resonate in parallel to heat the bottom of the pot. Then, the control module 10 sends a driving signal of the IGBT2 to the IGBT driving unit 11 to control the IGBT2 to operate, and simultaneously stops outputting driving signals of the IGBT1 and the IGBT3 to turn off the IGBT1 and the IGBT3, and at this time, the third coil disc L3 and the second capacitor C2 resonate in parallel to heat the side surface of the pot. Again, the control module 10 sends a driving signal of the IGBT3 to the IGBT driving unit 11 to control the IGBT3 to operate, and simultaneously stops outputting driving signals of the IGBT1 and the IGBT2 to turn off the IGBT1 and the IGBT2, and at this time, the fourth coil L4 resonates in parallel with the third capacitor C3 to heat the bottom of the pot. The control module 10 controls the resonant circuits to operate alternately in the control manner described above.
When the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, and at the moment, the second coil disc L2 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT 1. The control module 10 firstly sends a driving signal of the IGBT1 to the IGBT driving unit 11 to control the IGBT1 to operate, and simultaneously stops outputting driving signals of the IGBT2 and the IGBT3 to turn off the IGBT2 and the IGBT3, and at this time, the second coil disc L2 and the first capacitor C1 resonate in parallel to heat the bottom of the pot. Then, the control module 10 sends a driving signal of the IGBT2 to the IGBT driving unit 11 to control the IGBT2 to operate, and simultaneously stops outputting driving signals of the IGBT1 and the IGBT3 to turn off the IGBT1 and the IGBT3, and at this time, the third coil disc L3 and the second capacitor C2 resonate in parallel to heat the side surface of the pot. Again, the control module 10 sends a driving signal of the IGBT3 to the IGBT driving unit 11 to control the IGBT3 to operate, and simultaneously stops outputting driving signals of the IGBT1 and the IGBT2 to turn off the IGBT1 and the IGBT2, and at this time, the fourth coil L4 resonates in parallel with the third capacitor C3 to heat the bottom of the pot. The control module 10 controls the resonant circuits to operate alternately in the control manner described above.
According to a second embodiment of the present invention, as shown in fig. 2, the first coil L1 is connected in series with the first resonant capacitor C1 and then grounded GND, the node between the first coil L1 and the first resonant capacitor C1 is connected with the C-pole of the IGBT1, the C-pole of the IGBT1 is also connected with the second coil L2, the E-pole of the IGBT1 is grounded GND, the G-pole of the IGBT1 is connected with the IGBT driving unit 11 in the control module 10, the third coil L3 is connected in series with the second resonant capacitor C2 and then grounded GND, the node between the third coil L3 and the second resonant capacitor C2 is connected with the C-pole of the IGBT2, the E-pole of the IGBT2 is grounded GND, the G-pole of the IGBT2 is connected with the IGBT driving unit 11, the fourth coil L4 is connected with the C-pole of the IGBT3 and then grounded GND, the node between the fourth coil L4 and the third resonant capacitor C3 is connected with the C-pole of the IGBT3, and the G-pole of the IGBT3 is connected with the IGBT driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker.
When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, and at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT 1. The control module 10 firstly controls the IGBT1 to work, and simultaneously controls the IGBT2 and the IGBT3 to be turned off, and at the moment, the first coil disc L1 and the first resonance capacitor C1 are in series resonance to heat the bottom of the cooker. Then the control module 10 controls the IGBT2 to work, and simultaneously controls the IGBT1 and the IGBT3 to be closed, and at the moment, the third coil panel L3 and the second resonance capacitor C2 are in series resonance to heat the side face of the cooker. Again, the control module 10 controls the IGBT3 to operate, and simultaneously controls the IGBT1 and IGBT2 to turn off, at which time the fourth coil L4 and the third resonance capacitor C3 resonate in series to heat the bottom of the pot. The control module 10 controls the resonant circuits to operate alternately in the control manner described above.
When the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, and at the moment, the second coil disc L2 is connected in series with the first resonance capacitor C1 and forms a resonance circuit with the IGBT 1. The control module 10 firstly controls the IGBT1 to work, and simultaneously controls the IGBT2 and the IGBT3 to be turned off, and at the moment, the second coil panel L2 and the first resonance capacitor C1 are in series resonance to heat the bottom of the pot. Then the control module 10 controls the IGBT2 to work, and simultaneously controls the IGBT1 and the IGBT3 to be closed, and at the moment, the third coil panel L3 and the second resonance capacitor C2 are in series resonance to heat the side face of the cooker. Again, the control module 10 controls the IGBT3 to operate, and simultaneously controls the IGBT1 and IGBT2 to turn off, at which time the fourth coil L4 and the third resonance capacitor C3 resonate in series to heat the bottom of the pot. The control module 10 controls the resonant circuits to operate alternately in the control manner described above.
According to a third embodiment of the present invention, as shown in fig. 3, one end of a first resonant capacitor C1 is connected to a first end of a relay, the other end of the first resonant capacitor C1 is connected to a second end of the relay through a first coil disc L1, the other end of the first resonant capacitor C1 is further connected to a C pole of an IGBT1, the C pole of the IGBT1 is further connected to a second coil disc L2, an E pole of the IGBT1 is grounded GND, a G pole of the IGBT1 is connected to an IGBT driving unit 11 in a control module 10, a third coil disc L3 is connected to the C pole of the IGBT2 in parallel with the second resonant capacitor C2, the E pole of the IGBT2 is grounded GND, a G pole of the IGBT2 is connected to the IGBT driving unit 11, a fourth coil disc L4 is connected to the C pole of the IGBT3 in series with the third resonant capacitor C3, a node between the fourth coil disc L4 and the third resonant capacitor C3 is connected to the C pole of the IGBT3, the E pole of the IGBT3 is grounded GND, and the G pole of the IGBT3 is connected to the IGBT driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker. When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn; when the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, at the moment, the second coil panel L2 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn. The specific operation will not be described in detail here.
According to the fourth embodiment of the present invention, as shown in fig. 4, the first coil disc L1 is connected in series with the first resonant capacitor C1 and then grounded, the node between the first coil disc L1 and the first resonant capacitor C1 is connected to the C-pole of the IGBT1, the C-pole of the IGBT1 is also connected to the second coil disc L2, the E-pole of the IGBT1 is grounded GND, the G-pole of the IGBT1 is connected to the IGBT driving unit 11 in the control module 10, the third coil disc L3 is connected in parallel with the second resonant capacitor C2 and then connected to the C-pole of the IGBT2, the E-pole of the IGBT2 is grounded GND, the G-pole of the IGBT2 is connected to the IGBT driving unit 11, the fourth coil disc L4 is connected in series with the third resonant capacitor C3 and then grounded GND, the node between the fourth coil disc L4 and the third resonant capacitor C3 is connected to the C-pole of the IGBT3, the E-pole of the IGBT3 is grounded GND, and the G-pole of the IGBT3 is connected to the IGBT driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker. When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn; when the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, at the moment, the second coil panel L2 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn. The specific operation will not be described in detail here.
According to a fifth embodiment of the present invention, as shown in fig. 5, one end of a first resonant capacitor C1 is connected to a first end of a relay, the other end of the first resonant capacitor C1 is connected to a second end of the relay through a first coil disc L1, the other end of the first resonant capacitor C1 is further connected to a C pole of an IGBT1, the C pole of the IGBT1 is further connected to a second coil disc L2, an E pole of the IGBT1 is grounded GND, a G pole of the IGBT1 is connected to an IGBT driving unit 11 in a control module 10, a third coil disc L3 is connected to the second resonant capacitor C2 in series and then grounded GND, a node between the third coil disc L3 and the second resonant capacitor C2 is connected to a C pole of the IGBT2, the E pole of the IGBT2 is grounded GND, the G pole of the IGBT2 is connected to the IGBT driving unit 11, the fourth coil disc L4 is connected to a C pole of the IGBT3 in parallel, and the E pole of the IGBT3 is grounded GND, and the G pole of the IGBT3 is connected to the IGBT driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker. When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn; when the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, at the moment, the second coil panel L2 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn. The specific operation will not be described in detail here.
According to a sixth embodiment of the present invention, as shown in fig. 6, a first coil disc is connected in series with a first resonance capacitor and then grounded, a node between the first coil disc and the first resonance capacitor is connected to a C-pole of a first IGBT, the C-pole of the first IGBT is further connected to a second coil disc, an E-pole of the first IGBT is grounded, a G-pole of the first IGBT is connected to an IGBT driving unit in the control module, a third coil disc is connected in parallel with a second resonance capacitor and then connected to a C-pole of the second IGBT, an E-pole of the second IGBT is grounded, a G-pole of the second IGBT is connected to the IGBT driving unit, a fourth coil disc is connected in parallel with a third resonance capacitor and then connected to a C-pole of the third IGBT, an E-pole of the third IGBT is grounded, and a G-pole of the third IGBT is connected to the IGBT driving unit.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker. When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn; when the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, at the moment, the second coil panel L2 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn. The specific operation will not be described in detail here.
According to a seventh embodiment of the present invention, as shown in fig. 7, one end of the first resonant capacitor C1 is connected to the first end of the relay, the other end of the first resonant capacitor C1 is connected to the second end of the relay through the first coil disc L1, the other end of the first resonant capacitor C1 is also connected to the C pole of the IGBT1, the C pole of the IGBT1 is also connected to the second coil disc L2, the E pole of the IGBT1 is grounded GND, the G pole of the IGBT1 is connected to the IGBT driving unit 11 in the control module 10, the third coil disc L3 is grounded GND after being connected to the second resonant capacitor C2 in series, the node between the third coil disc L3 and the second resonant capacitor C2 is connected to the C pole of the IGBT2, the E pole of the IGBT2 is grounded GND, the G pole of the IGBT2 is connected to the IGBT driving unit 11, the fourth coil disc L4 is grounded GND after being connected to the third resonant capacitor C3 in series, the node between the fourth coil disc L4 and the third resonant capacitor C3 is connected to the C pole of the IGBT3, and the G pole of the IGBT3 is grounded GND 3 is connected to the driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker. When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn; when the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, at the moment, the second coil panel L2 is connected with the first resonance capacitor C1 in parallel and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn. The specific operation will not be described in detail here.
According to an eighth embodiment of the present invention, as shown in fig. 8, the first coil disc L1 is connected in series with the first resonant capacitor C1 and then grounded GND, the node between the first coil disc L1 and the first resonant capacitor C1 is connected to the C-pole of the IGBT1, the C-pole of the IGBT1 is also connected to the second coil disc L2, the E-pole of the IGBT1 is grounded GND, the G-pole of the IGBT1 is connected to the IGBT driving unit 11 in the control module 10, the third coil disc L3 is connected in series with the second resonant capacitor C2 and then grounded GND, the node between the third coil disc L3 and the second resonant capacitor C2 is connected to the C-pole of the IGBT2, the E-pole of the IGBT2 is grounded GND, the G-pole of the IGBT2 is connected to the IGBT driving unit 11, the fourth coil disc L4 is connected in parallel with the C-pole of the IGBT3 and then grounded GND, and the G-pole of the IGBT3 is connected to the IGBT driving unit 11.
Specifically, when the electromagnetic heating device is an electric cooker, the first coil L1, the second coil L2 and the fourth coil L4 may be used for bottom heating of the cooker, and the third coil L3 may be used for side heating of the cooker, and the control module 10 may control the relay and the power switch tube IGBT1, IGBT2, IGBT3 in real time according to the condition of cooking food in the cooker. When the control module 10 controls the relay to be in an off state, the first end of the relay is connected with the second end of the relay, at the moment, the first coil disc L1 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn; when the control module 10 controls the relay to be in a closed state, the first end of the relay is communicated with the third end of the relay, at the moment, the second coil panel L2 is connected with the first resonance capacitor C1 in series and forms a resonance circuit with the IGBT1, and the control module 10 controls the IGBT1, the IGBT2 and the IGBT3 to enable the resonance circuit to work in turn. The specific operation will not be described in detail here.
In summary, in the process of heating by the electromagnetic heating device, the relay does not need to frequently act, but the coil panel at the bottom of the pot is controlled to frequently switch to heat by controlling the IGBT1, the IGBT2 and the IBGT3, so that the service life of the relay is greatly prolonged, and the noise generated when the relay is switched is reduced. In addition, as can be seen from fig. 1 to 8, compared with the conventional multi-coil heating circuit, the use of relays, resonance capacitors and power switching tubes is reduced, the circuit structure is simple, and the wiring of the coil panel is also simple.
It should be noted that, in the embodiment of the present invention, when the relay is operated, the control module 10 needs to control the IGBT1, the IGBT2, and the IGBT3 to be turned off first, so as to avoid the reduction of the service life of the relay due to the contact arcing. In addition, the IGBT driving signals output by the control module 10 may independently control the IGBTs 1, 2, and 3, or may control the IGBTs 2 and 3 to turn off while driving the IGBTs 1 to operate, control the IGBTs 1 and 3 to turn off while driving the IGBTs 2 to operate, and control the IGBTs 1 and 2 to turn off while driving the IGBTs 3 to operate.
According to the heating control circuit of the electromagnetic heating device, the resonant capacitor, the power switch device and the selection switch can be effectively reduced to a certain extent, so that the circuit structure is simpler, the wiring of the coil panels is simpler, the cost is reduced, in addition, the selection switch is only used for selecting one of any two coil panels to participate in resonance, and the N power switch tubes are controlled by the control module to enable N resonant circuits to work in turn, so that the switching times of the selection switch are greatly reduced, and the service life of the selection switch is prolonged.
In addition, the embodiment of the invention also provides an electromagnetic heating device, which comprises the heating control circuit of the electromagnetic heating device.
According to the electromagnetic heating device, the use of the resonant capacitor, the power switch device and the selection switch can be effectively reduced to a certain extent through the heating control circuit, so that the circuit structure is simpler, the wiring of the coil panels is simpler, the cost is reduced, in addition, the selection switch is only used for selecting one of any two coil panels to participate in resonance, and the N power switch tubes are controlled by the control module to enable the N resonant circuits to work in turn, therefore, the switching times of the selection switch are greatly reduced, the service life of the selection switch is prolonged, and the stability and reliability of the electromagnetic heating device are further improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (17)

1. A heating control circuit of an electromagnetic heating apparatus, comprising:
N resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
when N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, wherein, the one end of first resonance electric capacity with select switch's first end links to each other, the other end of first resonance electric capacity pass through first coil panel with select switch's second end links to each other, the other end of first resonance electric capacity still links to each other with first IGBT's C utmost point, first IGBT's C utmost point still links to each other with the second coil panel, first IGBT's E utmost point ground, first IGBT's G utmost point with IGBT drive unit in the control module links to each other with second IGBT's C utmost point after the second resonance electric capacity is parallelly connected, second IGBT's G utmost point with IGBT drive unit links to each other, fourth coil panel and third resonance electric capacity after parallelly connected with third IGBT's C utmost point, the third IGBT's E utmost point is connected with the drive unit of third IGBT.
2. The heating control circuit of an electromagnetic heating device according to claim 1, wherein the selection switch is a relay, a first end of the relay is used as a first end of the selection switch to be connected with a power supply module of the electromagnetic heating device, a second end of the relay is used as a second end of the selection switch to be connected with a first coil disc of any two coil discs, a third end of the relay is used as a third end of the selection switch to be connected with a second coil disc of any two coil discs, and a control end of the relay is used as a control end of the selection switch to be connected with the control module.
3. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
The control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
when N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, and wherein, the first coil panel is ground after establishing ties with first resonance electric capacity, first coil panel with node between the first resonance electric capacity is connected with the C utmost point of first IGBT, the C utmost point of first IGBT still links to each other with the second coil panel, the E utmost point of first IGBT ground, the G utmost point of first IGBT with IGBT drive unit in the control module links to each other, and the third coil panel is ground after establishing ties with the second resonance electric capacity, the third coil panel with node between the second resonance electric capacity is connected with the C utmost point of second IGBT, the E utmost point of second IGBT is ground, the G utmost point of second IGBT with the C utmost point of fourth resonance electric capacity is connected with the C utmost point of third IGBT drive unit, the third coil panel is ground after establishing ties with the third resonance electric capacity, the G utmost point of third IGBT is connected with the node between the third IGBT drive unit is connected with the E utmost point of third IGBT.
4. A heating control circuit of an electromagnetic heating device according to claim 3, wherein the selection switch is a relay, a first end of the relay is connected to the power supply module of the electromagnetic heating device, a second end of the relay is connected to a first coil disc of the arbitrary two coil discs, a third end of the relay is connected to a second coil disc of the arbitrary two coil discs, and a control end of the relay is connected to the control module.
5. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
When N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, wherein, the one end of first resonance electric capacity with select switch's first end links to each other, the other end of first resonance electric capacity pass through first coil panel with select switch's second end links to each other, the other end of first resonance electric capacity still links to each other with first IGBT's C utmost point, first IGBT's C utmost point still links to each other with the second coil panel, first IGBT's E utmost point ground, first IGBT's G utmost point with the IGBT drive unit in the control module links to each other with the C utmost point of second IGBT after second resonance electric capacity connects in parallel, the E utmost point of second IGBT ground, the fourth coil panel with third resonance electric capacity after-connection, the fourth coil with the third IGBT's E utmost point ground is connected with the third IGBT's C utmost point ground, the third IGBT's G utmost point is connected with the third IGBT's drive unit.
6. The heating control circuit of an electromagnetic heating device according to claim 5, wherein the selection switch is a relay, a first end of the relay is used as a first end of the selection switch and is connected with a power supply module of the electromagnetic heating device, a second end of the relay is used as a second end of the selection switch and is connected with a first coil disc of any two coil discs, a third end of the relay is used as a third end of the selection switch and is connected with a second coil disc of any two coil discs, and a control end of the relay is used as a control end of the selection switch and is connected with the control module.
7. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
when N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, and wherein, the ground after first coil panel is established ties with first resonance electric capacity, first coil panel with node between the first resonance electric capacity is connected with the C utmost point of first IGBT, the C utmost point of first IGBT still links to each other with the second coil panel, the E utmost point of first IGBT ground, the G utmost point of first IGBT with IGBT drive unit in the control module links to each other, the C utmost point of third coil panel and second resonance electric capacity connects in parallel the back with the second IGBT, the E utmost point of second IGBT ground, the G utmost point of second IGBT with IGBT drive unit links to each other, the fourth coil panel is established ties with the third resonance electric capacity and is grounded, node between fourth coil panel and the third resonance electric capacity and the C utmost point of third IGBT links to each other, the G utmost point of third IGBT drive unit links to each other.
8. The heating control circuit of an electromagnetic heating device according to claim 7, wherein the selection switch is a relay, a first end of the relay is connected to the power supply module of the electromagnetic heating device, a second end of the relay is connected to a first coil disc of the arbitrary two coil discs, a third end of the relay is connected to a second coil disc of the arbitrary two coil discs, and a control end of the relay is connected to the control module.
9. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
When N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, wherein, the one end of first resonance electric capacity with select switch's first end links to each other, the other end of first resonance electric capacity pass through first coil panel with select switch's second end links to each other, the other end of first resonance electric capacity still links to each other with first IGBT's C utmost point, first IGBT's C utmost point still links to each other with the second coil panel, first IGBT's E utmost point ground, first IGBT's G utmost point with IGBT drive unit in the control module links to each other with the second resonance electric capacity series connection back ground, the third coil panel with node between the second resonance electric capacity links to each other with second IGBT's C utmost point, second IGBT's E utmost point ground, second IGBT's G utmost point with IGBT drive unit links to each other with the second coil panel, third IGBT's E utmost point ground links to each other with the third IGBT drive unit after the third IGBT's the drive unit connects with the third IGBT.
10. The heating control circuit of an electromagnetic heating device according to claim 9, wherein the selection switch is a relay, a first end of the relay is used as a first end of the selection switch to be connected with a power supply module of the electromagnetic heating device, a second end of the relay is used as a second end of the selection switch to be connected with a first coil disc of any two coil discs, a third end of the relay is used as a third end of the selection switch to be connected with a second coil disc of any two coil discs, and a control end of the relay is used as a control end of the selection switch to be connected with the control module.
11. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
when N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, and wherein, the ground after first coil panel is established ties with first resonance electric capacity, first coil panel with node between the first resonance electric capacity links to each other with the C utmost point of first IGBT, the C utmost point of first IGBT still links to each other with the second coil panel, the E utmost point of first IGBT ground connection, the G utmost point of first IGBT with IGBT drive unit in the control module links to each other, the C utmost point of third coil panel is connected with the C utmost point of second IGBT after being established ties with second resonance electric capacity, the G utmost point of second IGBT with the IGBT drive unit links to each other, the G utmost point of fourth coil panel is connected with the C utmost point of third IGBT after establishing ties with the third resonance electric capacity, the E utmost point of third IGBT is grounded, the G utmost point of third IGBT links to each other with the drive unit.
12. The heating control circuit of an electromagnetic heating device according to claim 11, wherein the selection switch is a relay, a first end of the relay is connected to the power supply module of the electromagnetic heating device, a second end of the relay is connected to a first coil disc of the arbitrary two coil discs, a third end of the relay is connected to a second coil disc of the arbitrary two coil discs, and a control end of the relay is connected to the control module.
13. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
the control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
When N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, wherein, the one end of first resonance electric capacity with select switch's first end links to each other, the other end of first resonance electric capacity pass through first coil panel with select switch's second end links to each other, the other end of first resonance electric capacity still links to each other with first IGBT's C utmost point, first IGBT's C utmost point still links to each other with the second coil panel, first IGBT's E utmost point ground, first IGBT's G utmost point with IGBT drive unit in the control module links to each other with the second resonance electric capacity series connection back ground, the third coil panel with node between the second resonance electric capacity links to each other with second IGBT's C utmost point, the E utmost point ground of second IGBT's G utmost point with the drive unit links to each other with the third coil panel, the third coil is connected with the third IGBT's C utmost point ground after the drive unit is connected with the third IGBT's C utmost point ground.
14. The heating control circuit of an electromagnetic heating device according to claim 13, wherein the selection switch is a relay, a first end of the relay is used as a first end of the selection switch and is connected with a power supply module of the electromagnetic heating device, a second end of the relay is used as a second end of the selection switch and is connected with a first coil disc of any two coil discs, a third end of the relay is used as a third end of the selection switch and is connected with a second coil disc of any two coil discs, and a control end of the relay is used as a control end of the selection switch and is connected with the control module.
15. A heating control circuit of an electromagnetic heating apparatus, comprising:
n resonant capacitors, wherein N is an integer greater than 1;
n power switching tubes;
a selection switch;
the device comprises N+1 coil panels, wherein any two of the N+1 coil panels are combined through the selection switch, one of the two coil panels is selected to participate in resonance through the selection switch, and the other N-1 coil panels in the N+1 coil panels and the coil panels selected by the selection switch to participate in resonance correspondingly form N resonance circuits with the N resonance capacitors and the N power switch tubes; and
The control module controls the N resonant circuits to work in turn by controlling the selection switch and the N power switching tubes;
when N equals 3, N resonance electric capacity includes first resonance electric capacity to third resonance electric capacity, N power switch tube includes first IGBT to third IGBT, N+1 coil panel includes first coil panel to fourth coil panel, and wherein, the first coil panel is ground after establishing ties with first resonance electric capacity, first coil panel with node between the first resonance electric capacity is connected with the C utmost point of first IGBT, the C utmost point of first IGBT still links to each other with the second coil panel, the E utmost point of first IGBT ground, the G utmost point of first IGBT with IGBT drive unit in the control module links to each other, and the third coil panel is ground after establishing ties with the second resonance electric capacity, the third coil panel with node between the second resonance electric capacity is connected with the C utmost point of second IGBT, the E utmost point of second IGBT is ground, the G utmost point of second IGBT with the C utmost point of fourth coil panel is connected with the C utmost point of third resonance electric capacity is connected with the C of third IGBT, the G utmost point of third IGBT is connected with the drive unit.
16. The heating control circuit of an electromagnetic heating device according to claim 15, wherein the selection switch is a relay, a first end of the relay is connected to the power supply module of the electromagnetic heating device, a second end of the relay is connected to a first coil disc of the arbitrary two coil discs, a third end of the relay is connected to a second coil disc of the arbitrary two coil discs, and a control end of the relay is connected to the control module.
17. An electromagnetic heating device, characterized by comprising a heating control circuit of the electromagnetic heating device according to any one of claims 1 to 16.
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CN109673073A (en) * 2018-01-17 2019-04-23 中山市翰林电器有限公司 A kind of multi-coil disk electromagnetic heating system
CN108966398A (en) * 2018-07-23 2018-12-07 珠海格力电器股份有限公司 A kind of device, control circuit, electric appliance and its control method inhibiting electromagnetic coupling

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