WO2016161796A1 - Dispositif de chauffage électromagnétique et son circuit résonant - Google Patents

Dispositif de chauffage électromagnétique et son circuit résonant 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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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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English (en)
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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Priority claimed from CN201510162004.4A external-priority patent/CN106162965B/zh
Priority claimed from CN201520205555.XU external-priority patent/CN204539508U/zh
Priority claimed from CN201520209601.3U external-priority patent/CN204539514U/zh
Priority claimed from CN201510164454.7A external-priority patent/CN106162969B/zh
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/fr

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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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  • General Induction Heating (AREA)

Abstract

L'invention concerne un circuit résonant (100) d'un dispositif de chauffage électromagnétique et un dispositif de chauffage électromagnétique comportant le circuit résonant (100). Le circuit résonant (100) comprend : un tube commutateur de résonance (10), une électrode émettrice du tube commutateur de résonance (10) étant mise à la terre ; un module de résonance (30), le module de résonance (30) comprenant une première bobine de résonance (L1), une seconde bobine de résonance (L2), un premier condensateur de résonance (C1), un second condensateur de résonance (C2) et un ensemble commutateur-permutateur (S1, S2, S3), la première bobine de résonance (L1) étant connectée à la seconde bobine de résonance (L2) en série et ensuite connectée à une électrode de collecteur du tube commutateur de résonance (10), puis le premier condensateur de résonance (C1) étant connecté au second condensateur de résonance (C2) en série et ensuite connecté à l'électrode de collecteur du tube commutateur de résonance (10), puis l'ensemble commutateur-permutateur (S1, S2, S3) étant utilisé pour sélectionner une inductance de résonance et une capacité de résonance qui participent à un travail de résonance ; et un organe de commande (20), l'organe de commande (20) modifiant la fréquence de résonance du dispositif de chauffage électromagnétique en commandant l'ensemble commutateur-permutateur (S1, S2, S3). Le circuit résonant (100) peut modifier la fréquence de résonance du dispositif de chauffage électromagnétique, réduire la tension d'attaque lorsque le tube commutateur de résonance (10) est activé et réduire l'augmentation de la température du tube commutateur de résonance (10).
PCT/CN2015/092983 2015-04-07 2015-10-27 Dispositif de chauffage électromagnétique et son circuit résonant WO2016161796A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
CN201510162004.4A CN106162965B (zh) 2015-04-07 2015-04-07 电磁加热装置及其的谐振电路
CN201510162004.4 2015-04-07
CN201510164454.7 2015-04-07
CN201520205555.XU CN204539508U (zh) 2015-04-07 2015-04-07 电磁加热装置及其的谐振电路
CN201520209601.3U CN204539514U (zh) 2015-04-07 2015-04-07 电磁加热装置及其的谐振电路
CN201510164454.7A CN106162969B (zh) 2015-04-07 2015-04-07 电磁加热装置及其的谐振电路
CN201520205555.X 2015-04-07
CN201520209601.3 2015-04-07

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