WO2016161796A1 - Electromagnetic heating device and resonance circuit thereof - Google Patents

Electromagnetic heating device and resonance circuit thereof Download PDF

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Publication number
WO2016161796A1
WO2016161796A1 PCT/CN2015/092983 CN2015092983W WO2016161796A1 WO 2016161796 A1 WO2016161796 A1 WO 2016161796A1 CN 2015092983 W CN2015092983 W CN 2015092983W WO 2016161796 A1 WO2016161796 A1 WO 2016161796A1
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WO
WIPO (PCT)
Prior art keywords
resonant
electromagnetic heating
heating device
capacitor
resonance
Prior art date
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PCT/CN2015/092983
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French (fr)
Chinese (zh)
Inventor
江德勇
李宝刚
曾露添
Original Assignee
佛山市顺德区美的电热电器制造有限公司
美的集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201510162004.4A external-priority patent/CN106162965B/en
Priority claimed from CN201520205555.XU external-priority patent/CN204539508U/en
Priority claimed from CN201520209601.3U external-priority patent/CN204539514U/en
Priority claimed from CN201510164454.7A external-priority patent/CN106162969B/en
Application filed by 佛山市顺德区美的电热电器制造有限公司, 美的集团股份有限公司 filed Critical 佛山市顺德区美的电热电器制造有限公司
Publication of WO2016161796A1 publication Critical patent/WO2016161796A1/en

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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

Definitions

  • the present invention relates to the field of electromagnetic heating technology, and in particular to a resonant circuit of an electromagnetic heating device and an electromagnetic heating device having the same.
  • a single IGBT (Insulated Gate Bipolar Transistor) electromagnetic resonance circuit generally adopts a parallel resonance mode, which adopts a resonance parameter operating under a high power condition, and if it is operated in a continuous low power section, The following problems occur:
  • the IGBT is turned on ahead of time, and the peak value of the IGBT transient current is high at the instant of turn-on, which easily exceeds the limit of the IGBT current peak specification, thereby damaging the IGBT;
  • the IGBT has a serious heat generation, and it is necessary to strengthen the heat dissipation of the IGBT (such as increasing the heat sink, increasing the fan speed, etc.) to achieve the temperature rise requirement of the IGBT.
  • the present invention aims to solve at least one of the technical problems in the above-mentioned techniques to some extent.
  • Another object of the present invention is to provide an electromagnetic heating device.
  • a resonant circuit of an electromagnetic heating device includes: a resonant switching tube, an emitter of the resonant switching tube is grounded; a resonant module, the resonant module includes a first resonant coil, a second resonant coil, a first resonant capacitor and a second resonant capacitor, and a changeover switch assembly, wherein the first resonant coil and the second resonant coil are connected in series and then connected to a collector of the resonant switch tube, a resonant capacitor and the second resonant capacitor are connected in series and connected to a collector of the resonant switch tube, the transfer switch assembly is configured to select a resonant inductor and a resonant capacitor participating in the resonant operation; a controller, the control The device changes the resonant frequency of the electromagnetic heating device by controlling the transfer switch assembly.
  • the resonant capacitor and the resonant inductor for performing the resonant operation can be increased or decreased by controlling the transfer switch assembly by the controller, and the topology of the resonant circuit is changed to achieve the purpose of changing the resonant frequency.
  • the lead voltage of the resonant switch tube can be well reduced and the temperature rise of the resonant switch tube can be reduced, and the resonant switch tube can be prevented from being damaged, so that the circuit can work safely and reliably.
  • by changing the resonant frequency of the electromagnetic heating device continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
  • the transfer switch assembly when the transfer switch assembly includes a first changeover switch, the first resonant coil and the first resonant capacitor are connected in parallel, and the second resonant coil and the second resonant capacitor are connected in parallel.
  • the first resonant coil and the first resonant capacitor connected in parallel with the second resonant coil and the second resonant capacitor connected in parallel are connected to the collector of the resonant switching tube, and the first switching switch
  • the second resonant capacitor is connected in parallel, and the control end of the first transfer switch is connected to the controller.
  • the controller controls the first changeover switch to be closed, the first resonant coil and the first resonant capacitor are connected in parallel for resonance operation; when the controller controls the first changeover switch to be turned off The first resonant coil and the first resonant capacitor are connected in parallel and then connected in series with the parallel second resonant coil and the second resonant capacitor for resonance operation.
  • the transfer switch assembly when the transfer switch assembly includes a second transfer switch and a third transfer switch, the first resonant coil and the second resonant coil are connected in series, the first resonant capacitor and the The second resonant capacitor is connected in series, wherein the first resonant coil and the second resonant coil connected in series are connected in parallel with the first resonant capacitor and the second resonant capacitor connected in series, and are connected to the collector of the resonant switch tube, and a second transfer switch is connected in parallel with the second resonant coil, the third transfer switch is connected in parallel with the second resonant capacitor, and a control end of the second transfer switch and a control end of the third transfer switch are respectively The controller is connected.
  • the controller controls both the second transfer switch and the third transfer switch to be closed, the first resonant coil and the first resonant capacitor are connected in parallel for resonance operation; when the controller controls When the second transfer switch is turned off and the third transfer switch is controlled to be closed, the first resonant coil and the second resonant coil are connected in series and then connected in parallel with the first resonant capacitor for resonance operation; When the controller controls the second transfer switch to be closed and controls the third transfer switch to be turned off, the first resonant coil is connected in parallel with the first resonant capacitor and the second resonant capacitor in series to perform resonance operation; When the controller controls the second transfer switch and the third transfer switch to be disconnected, the first resonant coil and the second resonant coil connected in series and the first resonant capacitor and the second resonant capacitor in series Parallel to perform resonant operation.
  • the first resonant coil corresponds to an inner ring of the electromagnetic heating device
  • the second resonant coil corresponds to an outer ring of the electromagnetic heating device
  • the electromagnetic heating device when the second transfer switch and the third transfer switch When both are closed, the electromagnetic heating device operates in the inner ring heating mode to perform first high power heating; when the second transfer switch is turned off and the third transfer switch is closed, the electromagnetic heating device The inner ring and the outer ring both operate in a heating mode to perform a second high power heating; when the second transfer switch is closed and the third transfer switch is open, the electromagnetic heating device operates in an inner ring heating mode The first low power heating is performed; when both the second transfer switch and the third transfer switch are disconnected, the electromagnetic heating device operates in a heating manner in both the inner ring and the outer ring to perform the second Low power heating.
  • the first resonant coil corresponds to an inner ring of the electromagnetic heating device
  • the first a second resonant coil corresponding to an outer ring of the electromagnetic heating device
  • the electromagnetic heating device when the first transfer switch is closed, the electromagnetic heating device operates in an inner ring heating mode to perform a third low power heating; when the first transfer switch When disconnected, the electromagnetic heating device operates in a simultaneous heating manner with the inner and outer rings for the third high power heating.
  • the changeover switch in the transfer switch assembly may be any one of a relay, a MOS transistor, a thyristor, or an IGBT.
  • the resonant switching transistor may be an IGBT.
  • the electromagnetic heating device further includes a filtering module connected between the power source and the resonance module, the filtering module includes a filter inductor and a filter capacitor, and one end of the filter inductor 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, and the other end of the filter inductor and the end of the filter capacitor have a first a node, the first node being connected to the resonance module.
  • the filtering module includes a filter inductor and a filter capacitor, and one end of the filter inductor 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, and the other end of the filter inductor and the end of the filter capacitor have a first a node, the first node being connected to the resonance module.
  • an embodiment of the present invention also proposes an electromagnetic heating device including the above-described resonant circuit of the electromagnetic heating device.
  • the electromagnetic heating device of the embodiment of the invention can increase or decrease the resonance capacitance and the resonance inductance of the resonance operation by changing the conversion switch component in the resonance module, change the topology structure of the resonance circuit, and achieve the purpose of changing the resonance frequency, thereby being able to
  • the lead voltage of the resonant switch tube is lowered and the temperature rise of the resonant switch tube is lowered to avoid damage of the resonant switch tube, so that the circuit can work safely and reliably.
  • changing the resonant frequency of the electromagnetic heating device continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
  • the electromagnetic heating device can be an electromagnetic rice cooker, an electromagnetic pressure cooker or an induction cooker.
  • FIG. 1 is a circuit diagram of a resonant circuit of an electromagnetic heating device when the first change-over switch S1 is turned off according to an embodiment of the present invention
  • FIG. 2 is a circuit diagram of a resonant circuit of an electromagnetic heating device when the first change-over switch S1 is closed, according to an embodiment of the present invention
  • FIG. 3 is a circuit diagram of a resonant circuit of an electromagnetic heating device according to another embodiment of the present invention.
  • FIG. 4 is a chart of components participating in resonance in four heating modes of an electromagnetic heating apparatus according to another embodiment of the present invention.
  • Resonant circuit 100 resonant switch tube 10, controller 20, resonant module 30;
  • Filter module 200 filter inductor L0, filter capacitor C0;
  • the resonance module 30 is: a first resonance coil L1, a first resonance capacitor C1, a second resonance coil L2, a second resonance capacitor C2, a first changeover switch S1, a second changeover switch S2, and a third changeover switch S3.
  • the resonant circuit 100 of the electromagnetic heating device includes a resonant switch tube 10, a controller 20, and a resonance module 30.
  • the emitter of the resonant switch 10 is grounded, and the resonant module 30 includes a first resonant coil L1, a second resonant coil L2, a first resonant capacitor C1 and a second resonant capacitor C2, and a transfer switch assembly, wherein the first resonant coil L1
  • the second resonant coil L2 is connected in series with the collector of the resonant switch tube 10
  • the first resonant capacitor C1 and the second resonant capacitor C2 are connected in series and connected to the collector of the resonant switch tube 10, and the switch
  • the components are used to select the resonant and resonant capacitors that participate in the resonant operation.
  • the controller changes the resonant frequency of the electromagnetic heating device by controlling the transfer switch assembly.
  • the resonant capacitor and the resonant inductor for performing the resonant operation can be increased or decreased by controlling the transfer switch assembly by the controller, and the topology of the resonant circuit is changed to achieve the purpose of changing the resonant frequency.
  • the lead voltage of the resonant switch tube can be well reduced and the temperature rise of the resonant switch tube can be reduced, and the resonant switch tube can be prevented from being damaged, so that the circuit can work safely and reliably.
  • by changing the resonant frequency of the electromagnetic heating device continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
  • the resonance module 30 includes the first resonant coil L1 and the second resonance
  • the coil L2, the first resonant capacitor C1 and the second resonant capacitor C2, the first transfer switch S1, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel
  • the second resonant coil L2 and the second resonant capacitor C2 are connected in parallel
  • the parallel A resonant coil L1 and a first resonant capacitor C1 are connected in series with the parallel second resonant coil L2 and the second resonant capacitor C2, and then connected to the collector of the resonant switch tube 10
  • the first transfer switch S1 is also coupled to the second resonance
  • the capacitor C2 is connected in parallel, and the control end of the first changeover switch S1 is connected to the controller 20.
  • the first transfer switch S1, the second resonance capacitor C2, and the second resonance coil L2 are added, and the first changeover switch S1, the second resonance capacitor C2, and the second resonance
  • the coils 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.
  • the controller 20 is connected to the control terminal of the first change-over switch S1, and the controller 20 changes the resonance frequency of the electromagnetic heating device by controlling the first change-over switch S1.
  • the resonant switch tube 10 may be an IGBT, that is, the emitter of the resonant switch tube 10, that is, the E pole of the IGBT, and the collector of the resonant switch tube 10, that is, the IGBT of the IGBT.
  • the G pole of the IGBT is connected to the controller 20, and the controller 20 controls the turn-on and turn-off of the IGBT by outputting a pulse width modulated PWM signal.
  • the controller 20 controls the first changeover switch S1 to be closed, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel for resonance operation, as shown in FIG. 2; when the controller 20 controls the first When the changeover switch S1 is turned off, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel and then connected in series with the parallel second resonant coil L2 and the second resonant capacitor C2 for resonance operation, as shown in FIG.
  • the resonant circuit of the electromagnetic heating device of the embodiment of the present invention can change the resonant inductance and the resonant capacitance of the resonant module 30 participating in the resonance operation by controlling the opening and closing of the first change-over switch S1, wherein when S1 is turned off Under the condition, L1 is connected in parallel with C1, L2 is connected in parallel with C2, then L1 and C1 in parallel are connected in series with L2 and C2 in parallel to participate in resonance work; when S1 is closed, L2 and C2 are in short-circuit state and do not work. Only L1 and C1 are connected in parallel to participate in the resonance operation.
  • the first resonant coil L1 and the second resonant coil L2 are each a coil disk, such as an inner and outer ring coil disk.
  • the first resonant coil L1 may correspond to an inner ring of the electromagnetic heating device, that is, an inner ring coil disk
  • the second resonant coil may correspond to an outer ring of the electromagnetic heating device, that is, an outer ring coil disk.
  • the resonant circuit can be operated in a high-power state, that is, the electromagnetic heating device is heated in the inner and outer rings.
  • the third high-power heating is performed; when the first change-over switch S1 is closed, only L1 and C1 are connected in parallel to participate in the resonance operation, and the resonant frequency is changed, which can well reduce the lead voltage of the resonant switch tube, such as the IGBT when it is turned on, and reduce the temperature rise of the IGBT.
  • the resonant circuit can be operated in a low power state, that is, the electromagnetic heating device performs the third low power heating in the inner ring heating manner, thereby widening the heating power range of the electromagnetic heating device.
  • the main control chip of the electromagnetic heating device when the heating power is lower than or equal to 1000 W, the main control chip of the electromagnetic heating device, that is, the controller 20, defaults to a low power state, and otherwise is a high power state.
  • the main control chip controls the first transfer switch S1 to be closed, and the resonant circuit operates in a manner that L1 and C1 are in parallel to participate in resonance.
  • the main control chip controls the first changeover switch S1 to be disconnected, and the resonant circuit is connected in parallel with the parallel L1 and C1 and the parallel L2 and C2. Participate in the way of resonance.
  • the electromagnetic heating device further includes a filter module 200 composed of a filter inductor L0 and a filter capacitor C0 for filtering and regulating the power supply of the 310V.
  • 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 source, and the other end of the filter inductor L0 is connected to one end of the filter capacitor C0. The other end of capacitor C0 The other end of the filter inductor L0 and the one end of the filter capacitor C0 have a first node, and the first node is connected to the resonance module 30.
  • the first changeover switch S1 may be any one of a high power relay, a MOS transistor, a thyristor, or an IGBT.
  • the resonant circuit of the electromagnetic heating device of the embodiment of the present invention changes its topology by controlling the closing and opening of the first changeover switch, thereby changing the resonant frequency of the electromagnetic heating device.
  • the first resonant coil and the first resonant capacitor connected in parallel are connected in series with the second resonant coil and the second resonant capacitor connected in parallel, and then connected to the collector of the resonant switching tube, and
  • the first transfer switch is connected in parallel with the second resonant capacitor, so that the controller can change the topology of the resonant circuit by controlling the closing and opening of the first transfer switch, and reduce the resonant capacitance and the resonant inductance for the resonant operation to change the resonant frequency.
  • the purpose is to well reduce the lead voltage when the resonant switch is turned on and reduce the temperature rise of the resonant switch tube, to avoid damage of the resonant switch tube, so that the circuit can work safely and reliably. Moreover, by reducing the resonance capacitance and the resonance inductance for performing the resonance operation, the resonance frequency of the electromagnetic heating device is changed, and the continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
  • the resonance module 30 includes the first The resonant coil L1 and the second resonant coil L2, the first resonant capacitor C1 and the second resonant capacitor C2, the second transfer switch S2 and the third transfer switch S3, the first resonant coil L1 and the second resonant coil L2 are connected in series, the first resonance The capacitor C1 and the second resonant capacitor C2 are connected in series, and the first resonant coil L1 and the second resonant coil L2 connected in series are connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series, and are connected to the collector of the resonant switch tube 10, Moreover, the second transfer switch S2 is connected in parallel with the second resonant coil L2, the third transfer switch S3 is connected in parallel with
  • the second transfer switch S2, the third transfer switch S3, the second resonance capacitor C2, and the second resonance coil L2 are added, and the first resonance coil L1 and the series are connected in series
  • the second resonant coil L2 is connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series
  • the second switching switch S2 is further connected in parallel with the second resonant coil L2 to control the second resonant coil L2, and the third switching switch S3
  • the second resonant capacitor C2 is further controlled in parallel with the second resonant capacitor C2.
  • the controller 20 is connected to the gate of the resonant switch 10 to control the on and off of the resonant switch 10, and the controller 20 is also respectively connected to the control terminal and the third switch of the second changeover switch S2.
  • the control terminals of the switch S3 are connected, and the controller 20 changes the resonance frequency of the electromagnetic heating device by controlling the second changeover switch S2 and the third changeover switch S3.
  • the resonant switch tube 10 may be an IGBT, that is, the emitter of the resonant switch tube 10, that is, the E pole of the IGBT, and the collector of the resonant switch tube 10, that is, the C pole of the IGBT, IGBT G pole and control
  • the controller 20 is connected, and the controller 20 controls the turn-on and turn-off of the IGBT by outputting a pulse width modulated PWM signal.
  • the controller 20 controls both the second changeover switch S2 and the third changeover switch S3 to be closed, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel for resonance operation; when the controller 20 controls the second When the changeover switch S2 is turned off and the third transfer switch S3 is controlled to be closed, the first resonant coil L1 and the second resonant coil L2 are connected in series and then connected in parallel with the first resonant capacitor C1 for resonance operation; when the controller 20 controls the second transfer switch When S2 is closed and the third transfer switch S3 is controlled to be turned off, the first resonant coil L1 is connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series to perform resonance operation; when the controller 20 controls the second changeover switch S2 and the When the three transfer switches S3 are both turned off, the first resonant coil L1 and the second resonant coil L2 connected in series are connected in parallel with the first re
  • the first resonant coil L1 and the second resonant coil L2 are generally coil disks, such as inner and outer loop coil disks.
  • the first resonant coil L1 may correspond to an inner ring of the electromagnetic heating device, that is, an inner ring coil disk
  • the second resonant coil may correspond to an outer ring of the electromagnetic heating device, that is, an outer ring coil disk.
  • the electromagnetic heating device operates in a first inner ring heating mode to perform the first high power heating, that is, the electromagnetic heating device operates in a single ring high power heating mode;
  • the electromagnetic heating device operates in a first inner and outer ring heating mode to perform the second high power heating, that is, the electromagnetic heating device operates in the double loop high power heating mode;
  • the electromagnetic heating device operates in a second inner ring heating mode to perform the first low power heating, that is, the electromagnetic heating device operates in a single ring low power heating mode;
  • both the changeover switch S2 and the third changeover switch S3 are open, the electromagnetic heating device operates in a second inner and outer ring heating mode for the second low power heating, that is, the electromagnetic heating device operates in the double loop low power heating mode.
  • the electromagnetic heating device has four heating modes, namely, mode one, mode two, mode three, and mode four, and the resonant module is changed by controlling the opening and closing of the second changeover switch S2 and the third changeover switch S3.
  • the resonant inductor and the resonant capacitor participating in the resonance work in 30 are used to realize the switching between the four modes, and the electromagnetic heating device can be operated with high and low power and single and double loop heating modes.
  • the second changeover switch S2 controls the on and off of the second resonant coil, and therefore, the second transfer switch S2 controls the electromagnetic heating device to operate in a single ring or double loop heating mode. Because the first resonant capacitor C1 and the second resonant capacitor C2 are connected in series, the resonant capacitor value decreases in series, which can reduce the lead voltage of the resonant switch tube, for example, when the IGBT is turned on, reduce the temperature rise of the IGBT, and stabilize the entire circuit in a low power state. Therefore, the third transfer switch S3 controls the high and low power operating state of the electromagnetic heating device. Therefore, by combining the control of the second transfer switch S2 and the third transfer switch S3, the electromagnetic heating device can realize high and low power operation of single and double rings.
  • mode 1 corresponds to the double-loop low-power heating mode.
  • both S2 and S3 are disconnected, and the components participating in the resonance are L1, C1, L2, and C2;
  • mode 2 corresponds to the double-loop high-power heating mode, and S2 is broken at this time.
  • S3 is closed, the components participating in the resonance are L1, C1, L2;
  • mode three corresponds to the single-loop low-power heating mode, at this time S2 is closed, S3 is disconnected, and participation
  • the resonant components are L1, C1, and C2;
  • mode four corresponds to the single-loop high-power heating mode.
  • both S2 and S3 are closed, and the components participating in the resonance are L1 and C1.
  • 0 in FIG. 4 indicates that the switch is off, and 1 indicates that the switch is closed.
  • various heating mode operations of the electromagnetic heating device can be realized, which not only widens the heating power range of the electromagnetic heating device, but also increases the selected space.
  • the main control chip of the electromagnetic heating device when the heating power is lower than or equal to 1000 W, the main control chip of the electromagnetic heating device, that is, the controller 20, defaults to a low power state, and otherwise is a high power state.
  • the main control chip controls the second transfer switch S2 to be closed and the third transfer switch S3 is turned off, and the resonant circuit is connected to the first resonant coil L1 and the series
  • the first resonant capacitor C1 and the second resonant capacitor C2 operate in parallel in a resonant manner.
  • the main control chip controls the second transfer switch S2 to be turned off and the third transfer switch S3 is closed, and the resonant circuit is first resonant coil L1 and The two resonant coils L2 are connected in series and then operated in parallel with the first resonant capacitor C1 to participate in resonance.
  • a certain high power for example, 2000 W
  • the main control chip controls the second transfer switch S2 to be turned off and the third transfer switch S3 is closed, and the resonant circuit is first resonant coil L1 and The two resonant coils L2 are connected in series and then operated in parallel with the first resonant capacitor C1 to participate in resonance.
  • the electromagnetic heating device further includes a filtering module 200 composed of a filter inductor L0 and a filter capacitor C0 for filtering and regulating the power supply of the 310V.
  • 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 source, and the other end of the filter inductor L0 is connected to one end of the filter capacitor C0. The other end of the capacitor C0 is grounded, and the other end of the filter inductor L0 and the one end of the filter capacitor C0 have a first node, and the first node is connected to the resonance module 30.
  • the second transfer switch and the third transfer switch may each be a high power relay, a MOS transistor, a thyristor or an IGBT.
  • the resonant circuit of the electromagnetic heating device of the embodiment of the present invention changes its topology by controlling the closing and opening of the changeover switches S2 and S3, thereby changing the resonant frequency of the electromagnetic heating device.
  • the first resonant coil and the second resonant coil connected in series in the resonant module are connected in parallel with the first resonant capacitor and the second resonant capacitor connected in series, and are connected to the collector of the resonant switching transistor.
  • the second transfer switch is connected in parallel with the second resonant coil
  • the third transfer switch is connected in parallel with the second resonant capacitor, so that the controller can increase or decrease the resonance for performing resonance operation by controlling the closing and opening of the second and third transfer switches
  • Capacitance and resonant inductance change the topology of the resonant circuit to achieve the purpose of changing the resonant frequency, so that the leading voltage of the resonant switch tube can be reduced and the temperature rise of the resonant switch tube can be reduced, and the resonant switch tube can be prevented from being damaged.
  • the circuit works safely and reliably.
  • by changing the resonant frequency of the electromagnetic heating device continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
  • an embodiment of the present invention also proposes an electromagnetic heating device including the above-described resonant circuit of the electromagnetic heating device.
  • the electromagnetic heating device may comprise an electromagnetic rice cooker, an electromagnetic pressure cooker and an induction cooker.
  • the electromagnetic heating device of the embodiment of the invention can increase or decrease the resonance capacitance and the resonance inductance of the resonance operation by changing the conversion switch component in the resonance module, change the topology structure of the resonance circuit, and achieve the purpose of changing the resonance frequency, thereby being able to
  • the lead voltage of the resonant switch tube is lowered and the temperature rise of the resonant switch tube is lowered to avoid damage of the resonant switch tube, so that the circuit can work safely and reliably.
  • changing the resonant frequency of the electromagnetic heating device continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
  • first and second 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.
  • features defining “first” and “second” may include one or more of the features either explicitly or implicitly.
  • the meaning of "a plurality” is two or more unless specifically and specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements.
  • installation can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Abstract

A resonance circuit (100) of an electromagnetic heating device and an electromagnetic heating device having the resonance circuit (100). The resonance circuit (100) comprises: a resonance switch tube (10), wherein an emitting electrode of the resonance switch tube (10) is grounded; a resonance module (30), wherein the resonance module (30) comprises a first resonance coil (L1), a second resonance coil (L2), a first resonance capacitor (C1), a second resonance capacitor (C2) and a change-over switch assembly (S1, S2, S3), wherein the first resonance coil (L1) is connected to the second resonance coil (L2) in series and then is connected to a collector electrode of the resonance switch tube (10), and the first resonance capacitor (C1) is connected to the second resonance capacitor (C2) in series and then is connected to the collector electrode of the resonance switch tube (10), and the change-over switch assembly (S1, S2, S3) is used for selecting a resonance inductance and a resonance capacitance which participate in a resonance work; and a controller (20), wherein the controller (20) change the resonance frequency of the electromagnetic heating device by controlling the change-over switch assembly (S1, S2, S3). The resonance circuit (100) can change the resonance frequency of the electromagnetic heating device, reduce the leading voltage when the resonance switch tube (10) is switched on, and reduce the temperature rise of the resonance switch tube (10).

Description

电磁加热装置及其谐振电路Electromagnetic heating device and its resonant circuit 技术领域Technical field
本发明涉及电磁加热技术领域，特别涉及一种电磁加热装置的谐振电路以及一种具有该谐振电路的电磁加热装置。The present invention relates to the field of electromagnetic heating technology, and in particular to a resonant circuit of an electromagnetic heating device and an electromagnetic heating device having the same.
背景技术Background technique
目前，单IGBT(Insulated Gate Bipolar Transistor，绝缘栅双极型晶体管)电磁谐振电路一般采用并联谐振方式，其采用运行在实现大功率前提下的谐振参数时，如果在连续低功率段运行，则会出现以下问题：At present, a single IGBT (Insulated Gate Bipolar Transistor) electromagnetic resonance circuit generally adopts a parallel resonance mode, which adopts a resonance parameter operating under a high power condition, and if it is operated in a continuous low power section, The following problems occur:
(1)IGBT超前开通，开通瞬间IGBT瞬态电流峰值高，容易超过IGBT电流峰值规格限制，从而损坏IGBT；(1) The IGBT is turned on ahead of time, and the peak value of the IGBT transient current is high at the instant of turn-on, which easily exceeds the limit of the IGBT current peak specification, thereby damaging the IGBT;
(2)IGBT发热严重，需要加强对IGBT散热(如增大散热片、增加风机转速等)以实现IGBT的温升要求。(2) The IGBT has a serious heat generation, and it is necessary to strengthen the heat dissipation of the IGBT (such as increasing the heat sink, increasing the fan speed, etc.) to achieve the temperature rise requirement of the IGBT.
发明内容Summary of the invention
本发明旨在至少从一定程度上解决上述技术中的技术问题之一。The present invention aims to solve at least one of the technical problems in the above-mentioned techniques to some extent.
为此，本发明的一个目的在于提出一种电磁加热装置的谐振电路，能够改变电磁加热装置的谐振频率，降低谐振开关管开通时的超前电压，并降低谐振开关管的温升。Accordingly, it is an object of the present invention to provide a resonant circuit for an electromagnetic heating device that can change the resonant frequency of the electromagnetic heating device, reduce the lead voltage when the resonant switch is turned on, and reduce the temperature rise of the resonant switch.
本发明的另一个目的在于提出一种电磁加热装置。Another object of the present invention is to provide an electromagnetic heating device.
为达到上述目的，本发明实施例提出的一种电磁加热装置的谐振电路，包括：谐振开关管，所述谐振开关管的发射极接地；谐振模块，所述谐振模块包括第一谐振线圈、第二谐振线圈、第一谐振电容和第二谐振电容、转换开关组件，其中，所述第一谐振线圈和所述第二谐振线圈串联后再与所述谐振开关管的集电极连接，所述第一谐振电容和所述第二谐振电容串联连接在一起后与所述谐振开关管的集电极相连，所述转换开关组件用于选择参与谐振工作的谐振电感和谐振电容；控制器，所述控制器通过控制所述转换开关组件以改变所述电磁加热装置的谐振频率。In order to achieve the above object, a resonant circuit of an electromagnetic heating device according to an embodiment of the present invention includes: a resonant switching tube, an emitter of the resonant switching tube is grounded; a resonant module, the resonant module includes a first resonant coil, a second resonant coil, a first resonant capacitor and a second resonant capacitor, and a changeover switch assembly, wherein the first resonant coil and the second resonant coil are connected in series and then connected to a collector of the resonant switch tube, a resonant capacitor and the second resonant capacitor are connected in series and connected to a collector of the resonant switch tube, the transfer switch assembly is configured to select a resonant inductor and a resonant capacitor participating in the resonant operation; a controller, the control The device changes the resonant frequency of the electromagnetic heating device by controlling the transfer switch assembly.
根据本发明实施例的电磁加热装置的谐振电路，通过控制器控制转换开关组件就能增减进行谐振工作的谐振电容和谐振电感，改变谐振电路的拓扑结构，来达到改变谐振频率的目的，从而能够很好地降低谐振开关管开通时的超前电压和降低谐振开关管的温升，避免谐振开关管损坏，使得电路能够安全、可靠地工作。并且，通过改变电磁加热装置的谐振频率，还可以实现电磁加热装置连续低功率加热，拓宽了电磁加热装置的加热功率范围。 According to the resonant circuit of the electromagnetic heating device according to the embodiment of the present invention, the resonant capacitor and the resonant inductor for performing the resonant operation can be increased or decreased by controlling the transfer switch assembly by the controller, and the topology of the resonant circuit is changed to achieve the purpose of changing the resonant frequency. The lead voltage of the resonant switch tube can be well reduced and the temperature rise of the resonant switch tube can be reduced, and the resonant switch tube can be prevented from being damaged, so that the circuit can work safely and reliably. Moreover, by changing the resonant frequency of the electromagnetic heating device, continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
根据本发明的一个实施例，当所述转换开关组件包括第一转换开关时，所述第一谐振线圈和所述第一谐振电容并联，所述第二谐振线圈和所述第二谐振电容并联，其中，并联的第一谐振线圈和第一谐振电容与并联的第二谐振线圈和第二谐振电容串联连接后与所述谐振开关管的集电极相连，并且，所述第一转换开关与所述第二谐振电容并联，所述第一转换开关的控制端与所述控制器相连。According to an embodiment of the present invention, when the transfer switch assembly includes a first changeover switch, the first resonant coil and the first resonant capacitor are connected in parallel, and the second resonant coil and the second resonant capacitor are connected in parallel The first resonant coil and the first resonant capacitor connected in parallel with the second resonant coil and the second resonant capacitor connected in parallel are connected to the collector of the resonant switching tube, and the first switching switch The second resonant capacitor is connected in parallel, and the control end of the first transfer switch is connected to the controller.
其中，当所述控制器控制所述第一转换开关闭合时，所述第一谐振线圈和所述第一谐振电容并联以进行谐振工作；当所述控制器控制所述第一转换开关断开时，所述第一谐振线圈和所述第一谐振电容并联后再与并联的第二谐振线圈和第二谐振电容串联以进行谐振工作。Wherein, when the controller controls the first changeover switch to be closed, the first resonant coil and the first resonant capacitor are connected in parallel for resonance operation; when the controller controls the first changeover switch to be turned off The first resonant coil and the first resonant capacitor are connected in parallel and then connected in series with the parallel second resonant coil and the second resonant capacitor for resonance operation.
根据本发明的另一个实施例，当所述转换开关组件包括第二转换开关和第三转换开关时，所述第一谐振线圈和所述第二谐振线圈串联，所述第一谐振电容和所述第二谐振电容串联，其中，串联的第一谐振线圈和第二谐振线圈与串联的第一谐振电容和第二谐振电容并联连接后与所述谐振开关管的集电极相连，并且，所述第二转换开关与所述第二谐振线圈并联，所述第三转换开关与所述第二谐振电容并联，所述第二转换开关的控制端和所述第三转换开关的控制端分别与所述控制器相连。According to another embodiment of the present invention, when the transfer switch assembly includes a second transfer switch and a third transfer switch, the first resonant coil and the second resonant coil are connected in series, the first resonant capacitor and the The second resonant capacitor is connected in series, wherein the first resonant coil and the second resonant coil connected in series are connected in parallel with the first resonant capacitor and the second resonant capacitor connected in series, and are connected to the collector of the resonant switch tube, and a second transfer switch is connected in parallel with the second resonant coil, the third transfer switch is connected in parallel with the second resonant capacitor, and a control end of the second transfer switch and a control end of the third transfer switch are respectively The controller is connected.
其中，当所述控制器控制所述第二转换开关和所述第三转换开关均闭合时，所述第一谐振线圈和所述第一谐振电容并联以进行谐振工作；当所述控制器控制所述第二转换开关断开且控制所述第三转换开关闭合时，所述第一谐振线圈和所述第二谐振线圈串联后再与所述第一谐振电容并联以进行谐振工作；当所述控制器控制所述第二转换开关闭合且控制所述第三转换开关断开时，所述第一谐振线圈与所述串联的第一谐振电容和第二谐振电容并联以进行谐振工作；当所述控制器控制所述第二转换开关和所述第三转换开关均断开时，所述串联的第一谐振线圈和第二谐振线圈与所述串联的第一谐振电容和第二谐振电容并联以进行谐振工作。Wherein, when the controller controls both the second transfer switch and the third transfer switch to be closed, the first resonant coil and the first resonant capacitor are connected in parallel for resonance operation; when the controller controls When the second transfer switch is turned off and the third transfer switch is controlled to be closed, the first resonant coil and the second resonant coil are connected in series and then connected in parallel with the first resonant capacitor for resonance operation; When the controller controls the second transfer switch to be closed and controls the third transfer switch to be turned off, the first resonant coil is connected in parallel with the first resonant capacitor and the second resonant capacitor in series to perform resonance operation; When the controller controls the second transfer switch and the third transfer switch to be disconnected, the first resonant coil and the second resonant coil connected in series and the first resonant capacitor and the second resonant capacitor in series Parallel to perform resonant operation.
并且，所述第一谐振线圈对应所述电磁加热装置的内环，所述第二谐振线圈对应所述电磁加热装置的外环，其中，当所述第二转换开关和所述第三转换开关均闭合时，所述电磁加热装置以所述内环加热方式运行以进行第一高功率加热；当所述第二转换开关断开且所述第三转换开关闭合时，所述电磁加热装置以所述内环和所述外环都加热方式运行以进行第二高功率加热；当所述第二转换开关闭合且所述第三转换开关断开时，所述电磁加热装置以内环加热方式运行以进行第一低功率加热；当所述第二转换开关和所述第三转换开关均断开时，所述电磁加热装置以所述内环和所述外环都加热方式运行以进行第二低功率加热。And, the first resonant coil corresponds to an inner ring of the electromagnetic heating device, the second resonant coil corresponds to an outer ring of the electromagnetic heating device, wherein, when the second transfer switch and the third transfer switch When both are closed, the electromagnetic heating device operates in the inner ring heating mode to perform first high power heating; when the second transfer switch is turned off and the third transfer switch is closed, the electromagnetic heating device The inner ring and the outer ring both operate in a heating mode to perform a second high power heating; when the second transfer switch is closed and the third transfer switch is open, the electromagnetic heating device operates in an inner ring heating mode The first low power heating is performed; when both the second transfer switch and the third transfer switch are disconnected, the electromagnetic heating device operates in a heating manner in both the inner ring and the outer ring to perform the second Low power heating.
根据本发明的一个实施例，所述第一谐振线圈对应所述电磁加热装置的内环，所述第 二谐振线圈对应所述电磁加热装置的外环，其中，当所述第一转换开关闭合时，所述电磁加热装置以内环加热方式运行以进行第三低功率加热；当所述第一转换开关断开时，所述电磁加热装置以内外环同时加热方式运行以进行第三高功率加热。According to an embodiment of the present invention, the first resonant coil corresponds to an inner ring of the electromagnetic heating device, the first a second resonant coil corresponding to an outer ring of the electromagnetic heating device, wherein when the first transfer switch is closed, the electromagnetic heating device operates in an inner ring heating mode to perform a third low power heating; when the first transfer switch When disconnected, the electromagnetic heating device operates in a simultaneous heating manner with the inner and outer rings for the third high power heating.
在本发明的一些实施例中，所述转换开关组件中的转换开关可以为继电器、MOS管、可控硅或者IGBT中的任意一种。In some embodiments of the present invention, the changeover switch in the transfer switch assembly may be any one of a relay, a MOS transistor, a thyristor, or an IGBT.
根据本发明的一个实施例，所述谐振开关管可以为IGBT。According to an embodiment of the invention, the resonant switching transistor may be an IGBT.
根据本发明的一个实施例，所述电磁加热装置还包括滤波模块，所述滤波模块连接在电源与所述谐振模块之间，所述滤波模块包括滤波电感和滤波电容，所述滤波电感的一端与所述电源相连，所述滤波电感的另一端与所述滤波电容的一端相连，所述滤波电容的另一端接地，所述滤波电感的另一端与所述滤波电容的一端之间具有第一节点，所述第一节点与所述谐振模块相连。According to an embodiment of the present invention, the electromagnetic heating device further includes a filtering module connected between the power source and the resonance module, the filtering module includes a filter inductor and a filter capacitor, and one end of the filter inductor 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, and the other end of the filter inductor and the end of the filter capacitor have a first a node, the first node being connected to the resonance module.
此外，本发明的实施例还提出了一种电磁加热装置，其包括上述的电磁加热装置的谐振电路。Further, an embodiment of the present invention also proposes an electromagnetic heating device including the above-described resonant circuit of the electromagnetic heating device.
本发明实施例的电磁加热装置，通过控制谐振模块中的转换开关组件就能增减进行谐振工作的谐振电容和谐振电感，改变谐振电路的拓扑结构，来达到改变谐振频率的目的，从而能够很好地降低谐振开关管开通时的超前电压和降低谐振开关管的温升，避免谐振开关管损坏，使得电路能够安全、可靠地工作。并且，通过改变电磁加热装置的谐振频率，还可以实现电磁加热装置连续低功率加热，拓宽了电磁加热装置的加热功率范围。The electromagnetic heating device of the embodiment of the invention can increase or decrease the resonance capacitance and the resonance inductance of the resonance operation by changing the conversion switch component in the resonance module, change the topology structure of the resonance circuit, and achieve the purpose of changing the resonance frequency, thereby being able to The lead voltage of the resonant switch tube is lowered and the temperature rise of the resonant switch tube is lowered to avoid damage of the resonant switch tube, so that the circuit can work safely and reliably. Moreover, by changing the resonant frequency of the electromagnetic heating device, continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
其中，所述电磁加热装置可为电磁电饭煲、电磁压力锅或电磁炉。Wherein, the electromagnetic heating device can be an electromagnetic rice cooker, an electromagnetic pressure cooker or an induction cooker.
附图说明DRAWINGS
图1为根据本发明一个实施例的第一转换开关S1断开时电磁加热装置的谐振电路的电路图；1 is a circuit diagram of a resonant circuit of an electromagnetic heating device when the first change-over switch S1 is turned off according to an embodiment of the present invention;
图2为根据本发明一个实施例的第一转换开关S1闭合时电磁加热装置的谐振电路的电路图；2 is a circuit diagram of a resonant circuit of an electromagnetic heating device when the first change-over switch S1 is closed, according to an embodiment of the present invention;
图3为根据本发明另一个实施例的电磁加热装置的谐振电路的电路图；以及3 is a circuit diagram of a resonant circuit of an electromagnetic heating device according to another embodiment of the present invention;
图4为根据本发明另一个实施例的电磁加热装置四种加热模式下参与谐振的元件图表。4 is a chart of components participating in resonance in four heating modes of an electromagnetic heating apparatus according to another embodiment of the present invention.
附图标记：Reference mark:
谐振电路100：谐振开关管10，控制器20，谐振模块30；Resonant circuit 100: resonant switch tube 10, controller 20, resonant module 30;
滤波模块200：滤波电感L0，滤波电容C0；Filter module 200: filter inductor L0, filter capacitor C0;
谐振模块30：第一谐振线圈L1，第一谐振电容C1，第二谐振线圈L2，第二谐振电容C2，第一转换开关S1，第二转换开关S2，第三转换开关S3。 The resonance module 30 is: a first resonance coil L1, a first resonance capacitor C1, a second resonance coil L2, a second resonance capacitor C2, a first changeover switch S1, a second changeover switch S2, and a third changeover switch S3.
具体实施方式detailed description
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.
下面参考附图来描述本发明实施例提出的电磁加热装置的谐振电路和具有该谐振电路的电磁加热装置。A resonant circuit of an electromagnetic heating device and an electromagnetic heating device having the same according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
结合图1至图3所示，本发明实施例提出的电磁加热装置的谐振电路100包括：谐振开关管10、控制器20和谐振模块30。As shown in FIG. 1 to FIG. 3, the resonant circuit 100 of the electromagnetic heating device according to the embodiment of the present invention includes a resonant switch tube 10, a controller 20, and a resonance module 30.
其中，谐振开关管10的发射极接地，谐振模块30包括第一谐振线圈L1、第二谐振线圈L2、第一谐振电容C1和第二谐振电容C2、转换开关组件，其中，第一谐振线圈L1和第二谐振线圈L2串联后再与所述谐振开关管10的集电极连接，第一谐振电容C1、和第二谐振电容C2串联连接在一起后与谐振开关管10的集电极相连，转换开关组件用于选择参与谐振工作的谐振电感和谐振电容。控制器通过控制转换开关组件以改变电磁加热装置的谐振频率。Wherein, the emitter of the resonant switch 10 is grounded, and the resonant module 30 includes a first resonant coil L1, a second resonant coil L2, a first resonant capacitor C1 and a second resonant capacitor C2, and a transfer switch assembly, wherein the first resonant coil L1 The second resonant coil L2 is connected in series with the collector of the resonant switch tube 10, and the first resonant capacitor C1 and the second resonant capacitor C2 are connected in series and connected to the collector of the resonant switch tube 10, and the switch The components are used to select the resonant and resonant capacitors that participate in the resonant operation. The controller changes the resonant frequency of the electromagnetic heating device by controlling the transfer switch assembly.
根据本发明实施例的电磁加热装置的谐振电路，通过控制器控制转换开关组件就能增减进行谐振工作的谐振电容和谐振电感，改变谐振电路的拓扑结构，来达到改变谐振频率的目的，从而能够很好地降低谐振开关管开通时的超前电压和降低谐振开关管的温升，避免谐振开关管损坏，使得电路能够安全、可靠地工作。并且，通过改变电磁加热装置的谐振频率，还可以实现电磁加热装置连续低功率加热，拓宽了电磁加热装置的加热功率范围。According to the resonant circuit of the electromagnetic heating device according to the embodiment of the present invention, the resonant capacitor and the resonant inductor for performing the resonant operation can be increased or decreased by controlling the transfer switch assembly by the controller, and the topology of the resonant circuit is changed to achieve the purpose of changing the resonant frequency. The lead voltage of the resonant switch tube can be well reduced and the temperature rise of the resonant switch tube can be reduced, and the resonant switch tube can be prevented from being damaged, so that the circuit can work safely and reliably. Moreover, by changing the resonant frequency of the electromagnetic heating device, continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
根据本发明的一个实施例，如图1所示，当所述转换开关组件包括第一转换开关S1时，谐振开关管10的发射极接地，谐振模块30包括第一谐振线圈L1和第二谐振线圈L2、第一谐振电容C1和第二谐振电容C2、第一转换开关S1，第一谐振线圈L1和第一谐振电容C1并联，第二谐振线圈L2和第二谐振电容C2并联，并联的第一谐振线圈L1和第一谐振电容C1与并联的第二谐振线圈L2和第二谐振电容C2串联连接后再与谐振开关管10的集电极相连，并且，第一转换开关S1还与第二谐振电容C2并联，第一转换开关S1的控制端与控制器20相连。According to an embodiment of the present invention, as shown in FIG. 1, when the transfer switch assembly includes the first changeover switch S1, the emitter of the resonant switch tube 10 is grounded, and the resonance module 30 includes the first resonant coil L1 and the second resonance The coil L2, the first resonant capacitor C1 and the second resonant capacitor C2, the first transfer switch S1, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel, and the second resonant coil L2 and the second resonant capacitor C2 are connected in parallel, and the parallel A resonant coil L1 and a first resonant capacitor C1 are connected in series with the parallel second resonant coil L2 and the second resonant capacitor C2, and then connected to the collector of the resonant switch tube 10, and the first transfer switch S1 is also coupled to the second resonance The capacitor C2 is connected in parallel, and the control end of the first changeover switch S1 is connected to the controller 20.
也就是说，在实施例的并联谐振拓扑结构中，增加了第一转换开关S1、第二谐振电容C2和第二谐振线圈L2，并且第一转换开关S1、第二谐振电容C2和第二谐振线圈L2三者之间并联连接，然后再与并联的第一谐振线圈L1和第一谐振电容C1串联连接。That is, in the parallel resonant topology of the embodiment, the first transfer switch S1, the second resonance capacitor C2, and the second resonance coil L2 are added, and the first changeover switch S1, the second resonance capacitor C2, and the second resonance The coils 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.
如图1所示，控制器20与第一转换开关S1的控制端相连，控制器20通过控制第一转换开关S1以改变电磁加热装置的谐振频率。 As shown in FIG. 1, the controller 20 is connected to the control terminal of the first change-over switch S1, and the controller 20 changes the resonance frequency of the electromagnetic heating device by controlling the first change-over switch S1.
根据本发明的一个实施例，如图1或图2所示，谐振开关管10可以为IGBT，即谐振开关管10的发射极即IGBT的E极，谐振开关管10的集电极即IGBT的C极，IGBT的G极与控制器20相连，控制器20通过输出脉宽调制PWM信号来控制IGBT的导通和关断。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, the emitter of the resonant switch tube 10, that is, the E pole of the IGBT, and the collector of the resonant switch tube 10, that is, the IGBT of the IGBT. The G pole of the IGBT is connected to the controller 20, and the controller 20 controls the turn-on and turn-off of the IGBT by outputting a pulse width modulated PWM signal.
在本实施例中，当控制器20控制第一转换开关S1闭合时，第一谐振线圈L1和第一谐振电容C1并联以进行谐振工作，具体如图2所示；当控制器20控制第一转换开关S1断开时，第一谐振线圈L1和第一谐振电容C1并联后再与并联的第二谐振线圈L2和第二谐振电容C2串联以进行谐振工作，具体如图1所示。即言，本发明实施例的电磁加热装置的谐振电路可通过控制第一转换开关S1的断开和闭合，改变谐振模块30中参与谐振工作的谐振电感和谐振电容，其中，当S1断开的条件下，L1与C1并联，L2与C2并联，然后并联的L1和C1与并联的L2和C2串联后共同参与谐振工作；当S1闭合的条件下，L2和C2处于短路状态，不起作用，仅有L1和C1并联参与谐振工作。In this embodiment, when the controller 20 controls the first changeover switch S1 to be closed, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel for resonance operation, as shown in FIG. 2; when the controller 20 controls the first When the changeover switch S1 is turned off, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel and then connected in series with the parallel second resonant coil L2 and the second resonant capacitor C2 for resonance operation, as shown in FIG. That is, the resonant circuit of the electromagnetic heating device of the embodiment of the present invention can change the resonant inductance and the resonant capacitance of the resonant module 30 participating in the resonance operation by controlling the opening and closing of the first change-over switch S1, wherein when S1 is turned off Under the condition, L1 is connected in parallel with C1, L2 is connected in parallel with C2, then L1 and C1 in parallel are connected in series with L2 and C2 in parallel to participate in resonance work; when S1 is closed, L2 and C2 are in short-circuit state and do not work. Only L1 and C1 are connected in parallel to participate in the resonance operation.
根据本发明的一个示例，第一谐振线圈L1和第二谐振线圈L2一般均为线圈盘，例如内外环线圈盘。其中，第一谐振线圈L1可对应电磁加热装置的内环，即内环线圈盘，第二谐振线圈可对应电磁加热装置的外环，即外环线圈盘。那么，当第一转换开关S1闭合时，电磁加热装置以内环加热方式运行以进行第三低功率加热；当第一转换开关S1断开时，电磁加热装置以内外环同时加热方式运行以进行第三高功率加热。According to an example of the present invention, the first resonant coil L1 and the second resonant coil L2 are each a coil disk, such as an inner and outer ring coil disk. The first resonant coil L1 may correspond to an inner ring of the electromagnetic heating device, that is, an inner ring coil disk, and the second resonant coil may correspond to an outer ring of the electromagnetic heating device, that is, an outer ring coil disk. Then, when the first changeover switch S1 is closed, the electromagnetic heating device operates in an inner ring heating mode to perform the third low power heating; when the first changeover switch S1 is turned off, the electromagnetic heating device operates in the same manner as the inner and outer rings simultaneously to perform the first Three high power heating.
即言，当第一转换开关S1断开时，并联的L1和C1与并联的L2和C2串联后共同参与谐振工作，可以使谐振电路运行在高功率状态，即电磁加热装置以内外环加热方式进行第三高功率加热；当第一转换开关S1闭合时，仅有L1和C1并联参与谐振工作，谐振频率改变，能很好地降低谐振开关管例如IGBT开通时的超前电压，降低IGBT温升，可以使谐振电路运行在低功率状态，即电磁加热装置以内环加热方式进行第三低功率加热，从而可拓宽电磁加热装置的加热功率范围。That is to say, when the first change-over switch S1 is turned off, the parallel L1 and C1 and the parallel L2 and C2 are connected in series to participate in the resonance work, and the resonant circuit can be operated in a high-power state, that is, the electromagnetic heating device is heated in the inner and outer rings. The third high-power heating is performed; when the first change-over switch S1 is closed, only L1 and C1 are connected in parallel to participate in the resonance operation, and the resonant frequency is changed, which can well reduce the lead voltage of the resonant switch tube, such as the IGBT when it is turned on, and reduce the temperature rise of the IGBT. The resonant circuit can be operated in a low power state, that is, the electromagnetic heating device performs the third low power heating in the inner ring heating manner, thereby widening the heating power range of the electromagnetic heating device.
具体而言，在本发明的一个示例中，加热功率低于或等于1000W时，电磁加热装置的主控芯片即控制器20默认为低功率状态，否则为高功率状态。当用户操作电磁加热装置运行某小功率(例如500W)加热或内环加热时，主控芯片控制第一转换开关S1闭合，谐振电路以L1和C1并联参与谐振的方式运行。当用户操作电磁加热装置运行某大功率(例如2000W)加热或内外环加热时，主控芯片控制第一转换开关S1断开，谐振电路以并联的L1和C1与并联的L2和C2串联后共同参与谐振的方式运行。Specifically, in one example of the present invention, when the heating power is lower than or equal to 1000 W, the main control chip of the electromagnetic heating device, that is, the controller 20, defaults to a low power state, and otherwise is a high power state. When the user operates the electromagnetic heating device to operate a small power (for example, 500 W) heating or inner ring heating, the main control chip controls the first transfer switch S1 to be closed, and the resonant circuit operates in a manner that L1 and C1 are in parallel to participate in resonance. When the user operates the electromagnetic heating device to run a certain high power (for example, 2000 W) heating or internal and external ring heating, the main control chip controls the first changeover switch S1 to be disconnected, and the resonant circuit is connected in parallel with the parallel L1 and C1 and the parallel L2 and C2. Participate in the way of resonance.
其中，如图1或图2所示，电磁加热装置还包括由滤波电感L0和滤波电容C0构成的滤波模块200，用于对310V的供电电源进行滤波稳压处理。滤波模块200连接在供电电源与谐振模块30之间，滤波模块200包括滤波电感L0和滤波电容C0，滤波电感L0的一端与电源相连，滤波电感L0的另一端与滤波电容C0的一端相连，滤波电容C0的另一端接 地，滤波电感L0的另一端与滤波电容C0的一端之间具有第一节点，第一节点与谐振模块30相连。As shown in FIG. 1 or FIG. 2, the electromagnetic heating device further includes a filter module 200 composed of a filter inductor L0 and a filter capacitor C0 for filtering and regulating the power supply of the 310V. 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 source, and the other end of the filter inductor L0 is connected to one end of the filter capacitor C0. The other end of capacitor C0 The other end of the filter inductor L0 and the one end of the filter capacitor C0 have a first node, and the first node is connected to the resonance module 30.
在本发明的实施例中，第一转换开关S1可以为大功率的继电器、MOS管、可控硅或者IGBT中的任意一种。In an embodiment of the present invention, the first changeover switch S1 may be any one of a high power relay, a MOS transistor, a thyristor, or an IGBT.
综上所述，本发明实施例的电磁加热装置的谐振电路通过控制第一转换开关的闭合和断开来改变其拓扑结构，从而改变电磁加热装置的谐振频率。In summary, the resonant circuit of the electromagnetic heating device of the embodiment of the present invention changes its topology by controlling the closing and opening of the first changeover switch, thereby changing the resonant frequency of the electromagnetic heating device.
根据本发明实施例的电磁加热装置的谐振电路，并联的第一谐振线圈和第一谐振电容与并联的第二谐振线圈和第二谐振电容串联连接后再与谐振开关管的集电极相连，并且第一转换开关与第二谐振电容并联，这样控制器通过控制第一转换开关的闭合和断开就能改变谐振电路的拓扑结构，减少进行谐振工作的谐振电容和谐振电感，来达到改变谐振频率的目的，从而能够很好地降低谐振开关管开通时的超前电压和降低谐振开关管的温升，避免谐振开关管损坏，使得电路能够安全、可靠地工作。并且，通过减少进行谐振工作的谐振电容和谐振电感，来改变电磁加热装置的谐振频率，还可以实现电磁加热装置连续低功率加热，拓宽了电磁加热装置的加热功率范围。According to the resonant circuit of the electromagnetic heating device of the embodiment of the present invention, the first resonant coil and the first resonant capacitor connected in parallel are connected in series with the second resonant coil and the second resonant capacitor connected in parallel, and then connected to the collector of the resonant switching tube, and The first transfer switch is connected in parallel with the second resonant capacitor, so that the controller can change the topology of the resonant circuit by controlling the closing and opening of the first transfer switch, and reduce the resonant capacitance and the resonant inductance for the resonant operation to change the resonant frequency. The purpose is to well reduce the lead voltage when the resonant switch is turned on and reduce the temperature rise of the resonant switch tube, to avoid damage of the resonant switch tube, so that the circuit can work safely and reliably. Moreover, by reducing the resonance capacitance and the resonance inductance for performing the resonance operation, the resonance frequency of the electromagnetic heating device is changed, and the continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
根据本发明的另一个实施例，如图3所示，当所述转换开关组件包括第二转换开关S2和第三转换开关S3时，谐振开关管10的发射极接地，谐振模块30包括第一谐振线圈L1和第二谐振线圈L2、第一谐振电容C1和第二谐振电容C2、第二转换开关S2和第三转换开关S3，第一谐振线圈L1和第二谐振线圈L2串联，第一谐振电容C1和第二谐振电容C2串联，串联的第一谐振线圈L1和第二谐振线圈L2与串联的第一谐振电容C1和第二谐振电容C2并联连接后与谐振开关管10的集电极相连，并且，第二转换开关S2与第二谐振线圈L2并联，第三转换开关S3与第二谐振电容C2并联，第二转换开关S2的控制端和第三转换开关S3的控制端分别与控制器20相连。According to another embodiment of the present invention, as shown in FIG. 3, when the transfer switch assembly includes the second changeover switch S2 and the third changeover switch S3, the emitter of the resonant switch tube 10 is grounded, and the resonance module 30 includes the first The resonant coil L1 and the second resonant coil L2, the first resonant capacitor C1 and the second resonant capacitor C2, the second transfer switch S2 and the third transfer switch S3, the first resonant coil L1 and the second resonant coil L2 are connected in series, the first resonance The capacitor C1 and the second resonant capacitor C2 are connected in series, and the first resonant coil L1 and the second resonant coil L2 connected in series are connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series, and are connected to the collector of the resonant switch tube 10, Moreover, the second transfer switch S2 is connected in parallel with the second resonant coil L2, the third transfer switch S3 is connected in parallel with the second resonant capacitor C2, and the control end of the second transfer switch S2 and the control end of the third transfer switch S3 are respectively connected to the controller 20 Connected.
也就是说，在本实施例的并联谐振拓扑结构中，增加了第二转换开关S2、第三转换开关S3、第二谐振电容C2和第二谐振线圈L2，并且串联的第一谐振线圈L1和第二谐振线圈L2与串联的第一谐振电容C1和第二谐振电容C2并联连接，第二转换开关S2再与第二谐振线圈L2并联以对第二谐振线圈L2进行控制，第三转换开关S3再与第二谐振电容C2并联以对第二谐振电容C2进行控制。That is, in the parallel resonance topology of the present embodiment, the second transfer switch S2, the third transfer switch S3, the second resonance capacitor C2, and the second resonance coil L2 are added, and the first resonance coil L1 and the series are connected in series The second resonant coil L2 is connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series, and the second switching switch S2 is further connected in parallel with the second resonant coil L2 to control the second resonant coil L2, and the third switching switch S3 The second resonant capacitor C2 is further controlled in parallel with the second resonant capacitor C2.
如图3所示，控制器20与谐振开关管10的门极相连接以控制谐振开关管10的导通与断开，控制器20还分别与第二转换开关S2的控制端和第三转换开关S3的控制端相连，控制器20通过控制第二转换开关S2和第三转换开关S3以改变电磁加热装置的谐振频率。As shown in FIG. 3, the controller 20 is connected to the gate of the resonant switch 10 to control the on and off of the resonant switch 10, and the controller 20 is also respectively connected to the control terminal and the third switch of the second changeover switch S2. The control terminals of the switch S3 are connected, and the controller 20 changes the resonance frequency of the electromagnetic heating device by controlling the second changeover switch S2 and the third changeover switch S3.
根据本发明的一个实施例，如图3所示，谐振开关管10可以为IGBT，即谐振开关管10的发射极即IGBT的E极，谐振开关管10的集电极即IGBT的C极，IGBT的G极与控 制器20相连，控制器20通过输出脉宽调制PWM信号来控制IGBT的导通和关断。According to an embodiment of the present invention, as shown in FIG. 3, the resonant switch tube 10 may be an IGBT, that is, the emitter of the resonant switch tube 10, that is, the E pole of the IGBT, and the collector of the resonant switch tube 10, that is, the C pole of the IGBT, IGBT G pole and control The controller 20 is connected, and the controller 20 controls the turn-on and turn-off of the IGBT by outputting a pulse width modulated PWM signal.
在本实施例中，当控制器20控制第二转换开关S2和第三转换开关S3均闭合时，第一谐振线圈L1和第一谐振电容C1并联以进行谐振工作；当控制器20控制第二转换开关S2断开且控制第三转换开关S3闭合时，第一谐振线圈L1和第二谐振线圈L2串联后再与第一谐振电容C1并联以进行谐振工作；当控制器20控制第二转换开关S2闭合且控制第三转换开关S3断开时，第一谐振线圈L1与串联的第一谐振电容C1和第二谐振电容C2并联以进行谐振工作；当控制器20控制第二转换开关S2和第三转换开关S3均断开时，串联的第一谐振线圈L1和第二谐振线圈L2与串联的第一谐振电容和第二谐振电容并联以进行谐振工作。In the present embodiment, when the controller 20 controls both the second changeover switch S2 and the third changeover switch S3 to be closed, the first resonant coil L1 and the first resonant capacitor C1 are connected in parallel for resonance operation; when the controller 20 controls the second When the changeover switch S2 is turned off and the third transfer switch S3 is controlled to be closed, the first resonant coil L1 and the second resonant coil L2 are connected in series and then connected in parallel with the first resonant capacitor C1 for resonance operation; when the controller 20 controls the second transfer switch When S2 is closed and the third transfer switch S3 is controlled to be turned off, the first resonant coil L1 is connected in parallel with the first resonant capacitor C1 and the second resonant capacitor C2 connected in series to perform resonance operation; when the controller 20 controls the second changeover switch S2 and the When the three transfer switches S3 are both turned off, the first resonant coil L1 and the second resonant coil L2 connected in series are connected in parallel with the first resonant capacitor and the second resonant capacitor connected in series to perform resonance operation.
其中，根据本发明的一个示例，第一谐振线圈L1和第二谐振线圈L2一般均为线圈盘，例如内外环线圈盘。并且，第一谐振线圈L1可对应电磁加热装置的内环，即内环线圈盘，第二谐振线圈可对应电磁加热装置的外环，即外环线圈盘。那么，当第二转换开关S2和第三转换开关S3均闭合时，电磁加热装置以第一内环加热方式运行以进行第一高功率加热，即电磁加热装置以单环高功率加热模式运行；当第二转换开关S2断开且第三转换开关S3闭合时，电磁加热装置以第一内外环加热方式运行以进行第二高功率加热，即电磁加热装置以双环高功率加热模式运行；当第二转换开关S2闭合且第三转换开关S3断开时，电磁加热装置以第二内环加热方式运行以进行第一低功率加热，即电磁加热装置以单环低功率加热模式运行；当第二转换开关S2和第三转换开关S3均断开时，电磁加热装置以第二内外环加热方式运行以进行第二低功率加热，即电磁加热装置以双环低功率加热模式运行。Therein, according to an example of the present invention, the first resonant coil L1 and the second resonant coil L2 are generally coil disks, such as inner and outer loop coil disks. Moreover, the first resonant coil L1 may correspond to an inner ring of the electromagnetic heating device, that is, an inner ring coil disk, and the second resonant coil may correspond to an outer ring of the electromagnetic heating device, that is, an outer ring coil disk. Then, when both the second changeover switch S2 and the third changeover switch S3 are closed, the electromagnetic heating device operates in a first inner ring heating mode to perform the first high power heating, that is, the electromagnetic heating device operates in a single ring high power heating mode; When the second changeover switch S2 is turned off and the third transfer switch S3 is closed, the electromagnetic heating device operates in a first inner and outer ring heating mode to perform the second high power heating, that is, the electromagnetic heating device operates in the double loop high power heating mode; When the two changeover switch S2 is closed and the third changeover switch S3 is turned off, the electromagnetic heating device operates in a second inner ring heating mode to perform the first low power heating, that is, the electromagnetic heating device operates in a single ring low power heating mode; When both the changeover switch S2 and the third changeover switch S3 are open, the electromagnetic heating device operates in a second inner and outer ring heating mode for the second low power heating, that is, the electromagnetic heating device operates in the double loop low power heating mode.
具体如图4所示，电磁加热装置具有四种加热模式即模式一、模式二、模式三和模式四，通过控制第二转换开关S2和第三转换开关S3的断开和闭合，改变谐振模块30中参与谐振工作的谐振电感和谐振电容，来实现四种模式之间的切换，可以实现电磁加热装置高低功率、单双环加热方式运行。Specifically, as shown in FIG. 4, the electromagnetic heating device has four heating modes, namely, mode one, mode two, mode three, and mode four, and the resonant module is changed by controlling the opening and closing of the second changeover switch S2 and the third changeover switch S3. The resonant inductor and the resonant capacitor participating in the resonance work in 30 are used to realize the switching between the four modes, and the electromagnetic heating device can be operated with high and low power and single and double loop heating modes.
其中，第二转换开关S2控制第二谐振线圈的通断，因此，第二转换开关S2控制电磁加热装置以单环或双环加热方式运行。因为第一谐振电容C1和第二谐振电容C2串联，串联后谐振电容值减小，可以降低谐振开关管例如IGBT开通时的超前电压，降低IGBT的温升，使整个电路稳定运行在低功率状态，故第三转换开关S3控制电磁加热装置的高低功率运行状态。所以说，通过对第二转换开关S2和第三转换开关S3组合控制，可以实现电磁加热装置单双环高低功率运行。Wherein, the second changeover switch S2 controls the on and off of the second resonant coil, and therefore, the second transfer switch S2 controls the electromagnetic heating device to operate in a single ring or double loop heating mode. Because the first resonant capacitor C1 and the second resonant capacitor C2 are connected in series, the resonant capacitor value decreases in series, which can reduce the lead voltage of the resonant switch tube, for example, when the IGBT is turned on, reduce the temperature rise of the IGBT, and stabilize the entire circuit in a low power state. Therefore, the third transfer switch S3 controls the high and low power operating state of the electromagnetic heating device. Therefore, by combining the control of the second transfer switch S2 and the third transfer switch S3, the electromagnetic heating device can realize high and low power operation of single and double rings.
如图4所示，模式一对应双环低功率加热模式，此时S2和S3均断开，参与谐振的元件为L1、C1、L2、C2；模式二对应双环高功率加热模式，此时S2断开，S3闭合，参与谐振的元件为L1、C1、L2；模式三对应单环低功率加热模式，此时S2闭合，S3断开，参与 谐振的元件为L1、C1、C2；模式四对应单环高功率加热模式，此时S2和S3均闭合，参与谐振的元件为L1、C1。其中，图4中0表示开关断开，1表示开关闭合。As shown in Fig. 4, mode 1 corresponds to the double-loop low-power heating mode. At this time, both S2 and S3 are disconnected, and the components participating in the resonance are L1, C1, L2, and C2; mode 2 corresponds to the double-loop high-power heating mode, and S2 is broken at this time. On, S3 is closed, the components participating in the resonance are L1, C1, L2; mode three corresponds to the single-loop low-power heating mode, at this time S2 is closed, S3 is disconnected, and participation The resonant components are L1, C1, and C2; mode four corresponds to the single-loop high-power heating mode. At this time, both S2 and S3 are closed, and the components participating in the resonance are L1 and C1. Wherein, 0 in FIG. 4 indicates that the switch is off, and 1 indicates that the switch is closed.
因此，在本发明的实施例中，可实现电磁加热装置多种加热模式运行，不仅拓宽电磁加热装置的加热功率范围，还增加选择的空间。Therefore, in the embodiment of the present invention, various heating mode operations of the electromagnetic heating device can be realized, which not only widens the heating power range of the electromagnetic heating device, but also increases the selected space.
具体而言，在本发明的一个示例中，加热功率低于或等于1000W时，电磁加热装置的主控芯片即控制器20默认为低功率状态，否则为高功率状态。当用户操作电磁加热装置运行某小功率(例如500W)加热或内环加热时，主控芯片控制第二转换开关S2闭合且第三转换开关S3断开，谐振电路以第一谐振线圈L1与串联的第一谐振电容C1和第二谐振电容C2并联参与谐振的方式运行。当用户操作电磁加热装置运行某大功率(例如2000W)加热或内外环加热时，主控芯片控制第二转换开关S2断开且第三转换开关S3闭合，谐振电路以第一谐振线圈L1和第二谐振线圈L2串联后再与第一谐振电容C1并联参与谐振的方式运行。Specifically, in one example of the present invention, when the heating power is lower than or equal to 1000 W, the main control chip of the electromagnetic heating device, that is, the controller 20, defaults to a low power state, and otherwise is a high power state. When the user operates the electromagnetic heating device to run a small power (for example, 500 W) heating or inner ring heating, the main control chip controls the second transfer switch S2 to be closed and the third transfer switch S3 is turned off, and the resonant circuit is connected to the first resonant coil L1 and the series The first resonant capacitor C1 and the second resonant capacitor C2 operate in parallel in a resonant manner. When the user operates the electromagnetic heating device to operate a certain high power (for example, 2000 W) heating or inner and outer ring heating, the main control chip controls the second transfer switch S2 to be turned off and the third transfer switch S3 is closed, and the resonant circuit is first resonant coil L1 and The two resonant coils L2 are connected in series and then operated in parallel with the first resonant capacitor C1 to participate in resonance.
其中，如图3所示，电磁加热装置还包括由滤波电感L0和滤波电容C0构成的滤波模块200，用于对310V的供电电源进行滤波稳压处理。滤波模块200连接在供电电源与谐振模块30之间，滤波模块200包括滤波电感L0和滤波电容C0，滤波电感L0的一端与电源相连，滤波电感L0的另一端与滤波电容C0的一端相连，滤波电容C0的另一端接地，滤波电感L0的另一端与滤波电容C0的一端之间具有第一节点，第一节点与谐振模块30相连。As shown in FIG. 3, the electromagnetic heating device further includes a filtering module 200 composed of a filter inductor L0 and a filter capacitor C0 for filtering and regulating the power supply of the 310V. 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 source, and the other end of the filter inductor L0 is connected to one end of the filter capacitor C0. The other end of the capacitor C0 is grounded, and the other end of the filter inductor L0 and the one end of the filter capacitor C0 have a first node, and the first node is connected to the resonance module 30.
在本发明的实施例中，第二转换开关和第三转换开关均可以为大功率的继电器、MOS管、可控硅或者IGBT中的任意一种。In an embodiment of the invention, the second transfer switch and the third transfer switch may each be a high power relay, a MOS transistor, a thyristor or an IGBT.
综上所述，本发明实施例的电磁加热装置的谐振电路通过控制转换开关S2和S3的闭合与断开来改变其拓扑结构，从而改变电磁加热装置的谐振频率。In summary, the resonant circuit of the electromagnetic heating device of the embodiment of the present invention changes its topology by controlling the closing and opening of the changeover switches S2 and S3, thereby changing the resonant frequency of the electromagnetic heating device.
根据本发明实施例的电磁加热装置的谐振电路，谐振模块中串联的第一谐振线圈和第二谐振线圈与串联的第一谐振电容和第二谐振电容并联连接后与谐振开关管的集电极相连，并且第二转换开关与第二谐振线圈并联，第三转换开关与第二谐振电容并联，这样控制器通过控制第二和第三转换开关的闭合和断开就能增减进行谐振工作的谐振电容和谐振电感，改变谐振电路的拓扑结构，来达到改变谐振频率的目的，从而能够很好地降低谐振开关管开通时的超前电压和降低谐振开关管的温升，避免谐振开关管损坏，使得电路能够安全、可靠地工作。并且，通过改变电磁加热装置的谐振频率，还可以实现电磁加热装置连续低功率加热，拓宽了电磁加热装置的加热功率范围。According to the resonant circuit of the electromagnetic heating device of the embodiment of the present invention, the first resonant coil and the second resonant coil connected in series in the resonant module are connected in parallel with the first resonant capacitor and the second resonant capacitor connected in series, and are connected to the collector of the resonant switching transistor. And the second transfer switch is connected in parallel with the second resonant coil, and the third transfer switch is connected in parallel with the second resonant capacitor, so that the controller can increase or decrease the resonance for performing resonance operation by controlling the closing and opening of the second and third transfer switches Capacitance and resonant inductance change the topology of the resonant circuit to achieve the purpose of changing the resonant frequency, so that the leading voltage of the resonant switch tube can be reduced and the temperature rise of the resonant switch tube can be reduced, and the resonant switch tube can be prevented from being damaged. The circuit works safely and reliably. Moreover, by changing the resonant frequency of the electromagnetic heating device, continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
此外，本发明的实施例还提出了一种电磁加热装置，其包括上述的电磁加热装置的谐振电路。 Further, an embodiment of the present invention also proposes an electromagnetic heating device including the above-described resonant circuit of the electromagnetic heating device.
其中，该电磁加热装置可包括电磁电饭煲、电磁压力锅和电磁炉。Wherein, the electromagnetic heating device may comprise an electromagnetic rice cooker, an electromagnetic pressure cooker and an induction cooker.
本发明实施例的电磁加热装置，通过控制谐振模块中的转换开关组件就能增减进行谐振工作的谐振电容和谐振电感，改变谐振电路的拓扑结构，来达到改变谐振频率的目的，从而能够很好地降低谐振开关管开通时的超前电压和降低谐振开关管的温升，避免谐振开关管损坏，使得电路能够安全、可靠地工作。并且，通过改变电磁加热装置的谐振频率，还可以实现电磁加热装置连续低功率加热，拓宽了电磁加热装置的加热功率范围。The electromagnetic heating device of the embodiment of the invention can increase or decrease the resonance capacitance and the resonance inductance of the resonance operation by changing the conversion switch component in the resonance module, change the topology structure of the resonance circuit, and achieve the purpose of changing the resonance frequency, thereby being able to The lead voltage of the resonant switch tube is lowered and the temperature rise of the resonant switch tube is lowered to avoid damage of the resonant switch tube, so that the circuit can work safely and reliably. Moreover, by changing the resonant frequency of the electromagnetic heating device, continuous low-power heating of the electromagnetic heating device can be realized, and the heating power range of the electromagnetic heating device is broadened.
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。Moreover, the terms "first" and "second" 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, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领 域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, in the case of non-contradictory situations, A person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples.
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。 Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (12)

  1. 一种电磁加热装置的谐振电路，其特征在于，包括：A resonant circuit of an electromagnetic heating device, comprising:
    谐振开关管，所述谐振开关管的发射极接地；a resonant switching tube, the emitter of the resonant switching tube is grounded;
    谐振模块，所述谐振模块包括第一谐振线圈、第二谐振线圈、第一谐振电容和第二谐振电容、转换开关组件，其中，所述第一谐振线圈和所述第二谐振线圈串联后再与所述谐振开关管的集电极连接，所述第一谐振电容和所述第二谐振电容串联连接在一起后与所述谐振开关管的集电极相连，所述转换开关组件用于选择参与谐振工作的谐振电感和谐振电容；a resonant module, the resonant module including a first resonant coil, a second resonant coil, a first resonant capacitor and a second resonant capacitor, and a transfer switch assembly, wherein the first resonant coil and the second resonant coil are connected in series Connected to the collector of the resonant switch tube, the first resonant capacitor and the second resonant capacitor are connected in series and connected to the collector of the resonant switch tube, and the transfer switch assembly is used to select to participate in resonance Working resonant inductor and resonant capacitor;
    控制器，所述控制器通过控制所述转换开关组件以改变所述电磁加热装置的谐振频率。A controller that changes a resonant frequency of the electromagnetic heating device by controlling the transfer switch assembly.
  2. 如权利要求1所述的电磁加热装置的谐振电路，其特征在于，当所述转换开关组件包括第一转换开关时，所述第一谐振线圈和所述第一谐振电容并联，所述第二谐振线圈和所述第二谐振电容并联，其中，并联的第一谐振线圈和第一谐振电容与并联的第二谐振线圈和第二谐振电容串联连接后与所述谐振开关管的集电极相连，并且，所述第一转换开关与所述第二谐振电容并联，所述第一转换开关的控制端与所述控制器相连。A resonant circuit for an electromagnetic heating apparatus according to claim 1, wherein said first resonant coil and said first resonant capacitor are connected in parallel when said switching switch assembly comprises a first switching switch, said second The resonant coil and the second resonant capacitor are connected in parallel, wherein the first resonant coil and the first resonant capacitor connected in parallel are connected in series with the second resonant coil and the second resonant capacitor connected in parallel, and are connected to the collector of the resonant switch tube. And, the first transfer switch is connected in parallel with the second resonant capacitor, and a control end of the first transfer switch is connected to the controller.
  3. 如权利要求2所述的电磁加热装置的谐振电路，其特征在于，其中，A resonant circuit for an electromagnetic heating apparatus according to claim 2, wherein
    当所述控制器控制所述第一转换开关闭合时，所述第一谐振线圈和所述第一谐振电容并联以进行谐振工作；When the controller controls the first changeover switch to be closed, the first resonant coil and the first resonant capacitor are connected in parallel to perform a resonance operation;
    当所述控制器控制所述第一转换开关断开时，所述第一谐振线圈和所述第一谐振电容并联后再与并联的第二谐振线圈和第二谐振电容串联以进行谐振工作。When the controller controls the first transfer switch to be turned off, the first resonant coil and the first resonant capacitor are connected in parallel and then connected in series with the parallel second resonant coil and the second resonant capacitor for resonance operation.
  4. 如权利要求1所述的电磁加热装置的谐振电路，其特征在于，当所述转换开关组件包括第二转换开关和第三转换开关时，所述第一谐振线圈和所述第二谐振线圈串联，所述第一谐振电容和所述第二谐振电容串联，其中，串联的第一谐振线圈和第二谐振线圈与串联的第一谐振电容和第二谐振电容并联连接后与所述谐振开关管的集电极相连，并且，所述第二转换开关与所述第二谐振线圈并联，所述第三转换开关与所述第二谐振电容并联，所述第二转换开关的控制端和所述第三转换开关的控制端分别与所述控制器相连。A resonant circuit of an electromagnetic heating apparatus according to claim 1, wherein said first resonant coil and said second resonant coil are connected in series when said changeover switch assembly comprises a second changeover switch and a third changeover switch The first resonant capacitor and the second resonant capacitor are connected in series, wherein the first resonant coil and the second resonant coil connected in series are connected in parallel with the first resonant capacitor and the second resonant capacitor connected in series with the resonant switch The collectors are connected, and the second transfer switch is connected in parallel with the second resonant coil, the third transfer switch is connected in parallel with the second resonant capacitor, and the control end of the second transfer switch and the first The control terminals of the three transfer switches are respectively connected to the controller.
  5. 如权利要求4所述的电磁加热装置的谐振电路，其特征在于，其中，A resonant circuit for an electromagnetic heating apparatus according to claim 4, wherein
    当所述控制器控制所述第二转换开关和所述第三转换开关均闭合时，所述第一谐振线圈和所述第一谐振电容并联以进行谐振工作；When the controller controls both the second transfer switch and the third transfer switch to be closed, the first resonant coil and the first resonant capacitor are connected in parallel for resonance operation;
    当所述控制器控制所述第二转换开关断开且控制所述第三转换开关闭合时，所述第一谐振线圈和所述第二谐振线圈串联后再与所述第一谐振电容并联以进行谐振工作； When the controller controls the second transfer switch to open and control the third transfer switch to be closed, the first resonant coil and the second resonant coil are connected in series and then connected in parallel with the first resonant capacitor to Perform resonance work;
    当所述控制器控制所述第二转换开关闭合且控制所述第三转换开关断开时，所述第一谐振线圈与所述串联的第一谐振电容和第二谐振电容并联以进行谐振工作；When the controller controls the second transfer switch to be closed and controls the third transfer switch to be turned off, the first resonant coil is connected in parallel with the first resonant capacitor and the second resonant capacitor in series for resonance operation ;
    当所述控制器控制所述第二转换开关和所述第三转换开关均断开时，所述串联的第一谐振线圈和第二谐振线圈与所述串联的第一谐振电容和第二谐振电容并联以进行谐振工作。The first resonant coil and the second resonant coil in series and the first resonant capacitor and the second resonant in series when the controller controls the second transfer switch and the third transfer switch to be both off The capacitors are connected in parallel for resonant operation.
  6. 如权利要求5所述的电磁加热装置的谐振电路，其特征在于，所述第一谐振线圈对应所述电磁加热装置的内环，所述第二谐振线圈对应所述电磁加热装置的外环，其中，The resonant circuit of the electromagnetic heating device according to claim 5, wherein the first resonant coil corresponds to an inner ring of the electromagnetic heating device, and the second resonant coil corresponds to an outer ring of the electromagnetic heating device, among them,
    当所述第二转换开关和所述第三转换开关均闭合时，所述电磁加热装置以所述内环加热方式运行以进行第一高功率加热；When the second transfer switch and the third transfer switch are both closed, the electromagnetic heating device operates in the inner ring heating mode to perform first high power heating;
    当所述第二转换开关断开且所述第三转换开关闭合时，所述电磁加热装置以所述内环和所述外环都加热方式运行以进行第二高功率加热；When the second transfer switch is turned off and the third transfer switch is closed, the electromagnetic heating device operates in a heating manner in both the inner ring and the outer ring to perform second high-power heating;
    当所述第二转换开关闭合且所述第三转换开关断开时，所述电磁加热装置以内环加热方式运行以进行第一低功率加热；When the second transfer switch is closed and the third transfer switch is turned off, the electromagnetic heating device operates in an inner ring heating mode to perform first low power heating;
    当所述第二转换开关和所述第三转换开关均断开时，所述电磁加热装置以所述内环和所述外环都加热方式运行以进行第二低功率加热。When both the second transfer switch and the third transfer switch are open, the electromagnetic heating device operates in a heating mode in both the inner ring and the outer ring for the second low power heating.
  7. 如权利要求3所述的电磁加热装置的谐振电路，其特征在于，所述第一谐振线圈对应所述电磁加热装置的内环，所述第二谐振线圈对应所述电磁加热装置的外环，其中，The resonant circuit of the electromagnetic heating device according to claim 3, wherein the first resonant coil corresponds to an inner ring of the electromagnetic heating device, and the second resonant coil corresponds to an outer ring of the electromagnetic heating device, among them,
    当所述第一转换开关闭合时，所述电磁加热装置以内环加热方式运行以进行第三低功率加热；When the first transfer switch is closed, the electromagnetic heating device operates in an inner ring heating mode to perform a third low power heating;
    当所述第一转换开关断开时，所述电磁加热装置以内外环同时加热方式运行以进行第三高功率加热。When the first transfer switch is turned off, the electromagnetic heating device operates in a simultaneous heating manner of the inner and outer rings to perform the third high power heating.
  8. 如权利要求1-7中任一项所述的电磁加热装置的谐振电路，其特征在于，所述转换开关组件中的转换开关为继电器、MOS管、可控硅或者IGBT中的任意一种。The resonant circuit of the electromagnetic heating device according to any one of claims 1 to 7, wherein the changeover switch in the changeover switch assembly is any one of a relay, a MOS transistor, a thyristor or an IGBT.
  9. 如权利要求1所述的电磁加热装置的谐振电路，其特征在于，所述谐振开关管为IGBT。A resonant circuit for an electromagnetic heating apparatus according to claim 1, wherein said resonant switching transistor is an IGBT.
  10. 如权利要求1所述的电磁加热装置的谐振电路，其特征在于，所述电磁加热装置还包括滤波模块，所述滤波模块连接在电源与所述谐振模块之间，所述滤波模块包括滤波电感和滤波电容，所述滤波电感的一端与所述电源相连，所述滤波电感的另一端与所述滤波电容的一端相连，所述滤波电容的另一端接地，所述滤波电感的另一端与所述滤波电容的一端之间具有第一节点，所述第一节点与所述谐振模块相连。The resonant circuit of the electromagnetic heating device according to claim 1, wherein the electromagnetic heating device further comprises a filtering module, the filtering module is connected between the power source and the resonance module, and the filtering 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, and the other end of the filter inductor is There is a first node between one end of the filter capacitor, and the first node is connected to the resonance module.
  11. 一种电磁加热装置，其特征在于，包括如权利要求1-10中任一项所述的电磁加热装置的谐振电路。 An electromagnetic heating device comprising a resonant circuit of the electromagnetic heating device according to any one of claims 1 to 10.
  12. 如权利要求11所述的电磁加热装置，其特征在于，所述电磁加热装置为电磁电饭煲、电磁压力锅或电磁炉。 The electromagnetic heating apparatus according to claim 11, wherein said electromagnetic heating means is an electromagnetic rice cooker, an electromagnetic pressure cooker or an induction cooker.
PCT/CN2015/092983 2015-04-07 2015-10-27 Electromagnetic heating device and resonance circuit thereof WO2016161796A1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
CN201510162004.4A CN106162965B (en) 2015-04-07 2015-04-07 Electromagnetic heating device and resonant circuit thereof
CN201510164454.7 2015-04-07
CN201520205555.XU CN204539508U (en) 2015-04-07 2015-04-07 Electromagnetic heater and resonant circuit
CN201520209601.3U CN204539514U (en) 2015-04-07 2015-04-07 Electromagnetic heater and resonant circuit
CN201520209601.3 2015-04-07
CN201510164454.7A CN106162969B (en) 2015-04-07 2015-04-07 Electromagnetic heating device and resonant circuit thereof
CN201510162004.4 2015-04-07
CN201520205555.X 2015-04-07

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