EP2999306A1 - Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque - Google Patents

Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque Download PDF

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Publication number
EP2999306A1
EP2999306A1 EP15176584.9A EP15176584A EP2999306A1 EP 2999306 A1 EP2999306 A1 EP 2999306A1 EP 15176584 A EP15176584 A EP 15176584A EP 2999306 A1 EP2999306 A1 EP 2999306A1
Authority
EP
European Patent Office
Prior art keywords
induction
unit
induction hob
switching element
power
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP15176584.9A
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German (de)
English (en)
Inventor
Alex Viroli
Laurent Jeanneteau
Massimo Nostro
Massimo Zangoli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Appliances AB
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Electrolux Appliances AB
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.)
Filing date
Publication date
Application filed by Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP15176584.9A priority Critical patent/EP2999306A1/fr
Publication of EP2999306A1 publication Critical patent/EP2999306A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates generally to the field of induction hobs. More specifically, the present invention is related to an induction hob configured to reduce switching losses of the switching element within the power stage.
  • Induction hobs for preparing food are well known in prior art.
  • Induction hobs typically comprise at least one heating zone which is associated with at least one induction element.
  • the induction element is coupled with electronic driving means comprising a switching element for driving an AC current through the induction element.
  • Said AC current generates a time varying magnetic field.
  • the switching element receives a pulsed enabling signal in order to enable a current flow through the induction element according to the enabling signal.
  • the switching losses of the switching element significantly depend on the voltage values applied to the switching element.
  • the invention relates to an induction hob comprising a power stage with at least one switching element for enabling an alternating current flow through an induction element and a control unit providing an enabling signal to the switching element for enabling said current flow through said induction element.
  • the induction hob further comprises a trigger generation unit, said trigger generation unit receiving an oscillating voltage provided at a first monitoring point of the power stage and a reference voltage provided at a second monitoring point of the power stage.
  • the trigger generation unit is adapted to derive a trigger signal based on the oscillating voltage and the reference voltage.
  • the trigger generation unit is coupled with the control unit for transmitting said trigger signal to the control unit.
  • control unit comprises a delay unit, said delay unit being triggered by the trigger signal, wherein the delay unit is configured to control the provision of an enabling signal to the switching element after elapsing of a delay time.
  • an appropriate timing of the provision of the enabling signal specifically an appropriate timing of the provision of a pulse of the enabling signal to the power stage may be achieved. Said timing may be chosen such that the voltage drop across the switching element is minimized when the enabling signal is applied to the switching element.
  • the switching element is an insulated-gate bipolar transistor.
  • Said insulated-gate bipolar transistor may be arranged in a quasi-resonant architecture.
  • the first monitoring point is arranged at the collector of the switching element. Said arrangement is advantageous because the voltage at the collector directly corresponds to the voltage drop across the switching element and therefore comprises information regarding the appropriate timing of launching the next enabling signal pulse.
  • the second monitoring point is directly coupled with the electrical connection between the induction element and a capacitor, said capacitor being directly coupled with the induction element, wherein said induction element and said capacitor forming a resonant oscillating circuit of the induction hob.
  • Said capacitor may have a high capacity value leading to an oscillation-free or essentially oscillation-free voltage signal at said electrical node between the induction element and said at least one capacitor.
  • the voltage of said electrical node may be only slowly varying.
  • the minimum voltage value of the oscillating voltage may be derived by comparing said oscillating voltage with said slowly varying reference voltage.
  • the trigger generation unit comprises a comparator adapted to derive said trigger signal based on the comparison of the voltage level of the oscillating voltage and the voltage level of the reference voltage level.
  • the trigger signal may be a digital signal with a high level and a low level and steep edges between said high levels and said low levels.
  • the level of the trigger signal may directly depend on the voltage ratio of the oscillating voltage and the reference voltage.
  • the delay unit is configured to start a delay timer based on the rising or falling edge of the trigger signal.
  • the edge may be chosen which is in close proximity to the minimum of the oscillating voltage.
  • the delay unit is configured to determine the delay time based on the pulse duration of the enabling signal.
  • the oscillating voltage and the reference voltage may depend on the pulse duration of the enabling signal because said pulse duration changes the powering of the induction coil, i.e. the electrical load of the power stage.
  • the period of time between the crossing of the voltage values of the oscillating voltage and the reference voltage may also vary dependent on the pulse duration of the enabling signal. Said variation may be compensated by providing the pulse duration of the enabling signal or an information derived from the pulse duration to the delay unit in order to control the delay time based on the pulse duration of the enabling signal.
  • the induction hob comprises a power estimation unit for determining or estimating the electrical power consumption of the power stage.
  • the power estimation unit may receive information regarding electrical voltage and/or current values from the power stage in order to determine or estimate the power consumption of said power stage.
  • control unit is adapted to compare the estimated power consumption provided by the power estimation unit with the power requested by the user in order to adapt the power consumption of the power stage to the requested power.
  • a control loop is provided which may adapt the power consumption of the power stage according to the power requested by a user.
  • control unit is configured to adapt the pulse duration of the enabling signal based on the comparison result between the requested power and the estimated power consumption.
  • the pulse duration By changing the pulse duration, the energy transferred to the piece of cookware placed above the induction element may be increased thereby also increasing the power consumption of the power stage. Therefore, in case that the power consumption of the power stage is below the requested power, the pulse duration may be increased. On the other hand, the pulse duration may be decreased if the power consumption of the power stage is above the requested power.
  • the invention relates to a method for operating an induction hob, the induction hob comprising a power stage with at least one switching element for enabling an alternating current flow through an induction element and a control unit providing an enabling signal to said switching element for enabling said current flow through said induction element.
  • the induction hob comprises a trigger generation unit, said trigger generation unit receiving an oscillating voltage provided at a first monitoring point of the power stage and a reference voltage provided at a second monitoring point of the power stage.
  • the trigger generation unit derives a trigger signal based on the oscillating voltage and the reference voltage and transmits said trigger signal to the control unit.
  • the control unit comprises a delay unit, said delay unit being triggered by the trigger signal, wherein the delay unit provides an enabling signal to the switching element after elapsing of a delay time.
  • Fig. 1 shows a schematic illustration of an induction hob 1 according to the invention.
  • the induction hob 1 may comprise multiple heating zones 2 preferably provided at a common hob plate. Each heating zone is correlated with at least one induction element placed beneath the hop plate.
  • the induction hob 1 further comprises a user interface 3 for receiving user input and/or providing information, specifically graphical information to the user.
  • the induction hob 1 may comprise at least one switching element associated with a respective induction element for enabling a current flow through said induction element.
  • the switching element may be controlled by an enabling signal, said enabling signal enabling a current flow through said induction element in order to induce eddy currents within the piece of cookware placed above the induction element.
  • Fig. 2 shows a schematic block diagram of an induction hob 1 being adapted to perform an improved timing for providing an enabling signal P to the switching element thereby lowering the switching losses of the switching element.
  • the induction hob 1 comprises a power stage 10, a control unit 11 and a user interface 3, said user interface 3 being coupled with the control unit 11 in order to provide information to the user and/or to receive information from the user via the user interface 3. Furthermore, the induction hob 1 may comprise a bridge rectifier 13, said bridge rectifier 13 being coupled with the power stage 10 for providing electrical power to the induction element comprised within the power stage 10. The bridge rectifier 13 may be coupled with one or more phases of the mains supply network.
  • control unit 11 is coupled with the power stage 10 via a driver unit 14, said driver unit 14 being adapted to receive the enabling signal P provided by the control unit 11, modify said received enabling signal P and provide a modified enabling signal P' to the power stage 10.
  • control unit 11 may be directly coupled with the power stage 10, i.e. may provide the enabling signal P directly to the power stage 10.
  • the induction hob 1 comprises a trigger generation unit 12.
  • Said trigger generation unit 12 is coupled with the power stage 10 in order to receive two different electrical signals.
  • the trigger generation unit 12 is adapted to derive a trigger signal TS based on said electrical signals.
  • the trigger generation unit receives an oscillating voltage Vc provided at the first monitoring point 23 of the power stage 10.
  • Said first monitoring point 23 may be associated with the switching element of the power stage 10 in order to derive information regarding the voltage drop at the switching element.
  • the first monitoring point 23 may be arranged at the collector of the switching element, i.e. the oscillating voltage Vc measured at the first monitoring point 23 corresponds to the voltage at the collector of the switching element.
  • the switching element may be an insulated-gate bipolar transistor (IGBT) and the power stage comprises quasi-resonant architecture, i.e. uses a single switching element.
  • IGBT insulated-gate bipolar transistor
  • the trigger generation unit 12 receives a reference voltage signal provided at a second monitoring point 25 of the power stage 10.
  • Said second monitoring point 25 may be associated with a capacitor, said capacitor forming together with the induction element an oscillating circuit within the power stage 10.
  • the capacitor may have a high capacity value. Therefore, the reference voltage Vdc may be only slowly varying with respect to the oscillating voltage Vc.
  • the trigger generation unit 12 may comprise a comparator, said comparator receiving the oscillating voltage Vc and the reference voltage Vdc provided by the power stage 10. Said comparator may provide the trigger signal TS by comparing the voltage value of the oscillating voltage Vc with the voltage value of the reference voltage Vdc.
  • the comparator may provide an rectangular trigger signal TS.
  • the trigger signal may comprise a low level in case that the oscillating voltage Vc is greater than the reference voltage Vdc and the trigger signal may comprise a high level in case that the oscillating voltage Vc is lower than the reference voltage Vdc with steep edges between said high level and said low level.
  • the trigger generation unit 12 is coupled with the control unit 11 for transmitting the trigger signal TS to said control unit 11.
  • the control unit 11 comprises a delay unit 11.1 configured to receive said trigger signal TS.
  • the delay unit 11.1 may be triggered by the rising or falling edge of said trigger signal TS and may start a delay timer.
  • Said delay timer may start a delay mechanism by counting down a delay time ⁇ t.
  • the control unit may transmit a new enabling signal P to the power stage 10 in order to power the induction element.
  • the oscillating voltage Vc may reach the minimum value or a value close to minimum value.
  • the oscillating voltage Vc corresponds to the voltage drop over the switching element and therefore also said voltage dropping over the switching element reaches a minimum value or a value close to minimum value. Thereby, the switching losses of the switching element are significantly reduced.
  • Fig. 3 shows the driver unit 14, the power stage 10 and the bridge rectifier 13 in closer detail.
  • the driver unit 14 receives at Input I1 the enabling signal P for enabling an alternating current flow through the power stage 10.
  • the driver unit 14 comprises an electrical circuitry configured to adapt the received enabling signal P according to the needs of the power stage 10. For example, the driver unit may amplify the received enabling signal P and/or may change the signal level of the enabling signal P by adding a certain offset voltage value to said received enabling signal P in order to derive a modified enabling signal P'.
  • Said modified electrical pulse P' may be provided to the gate of the switching element 20.
  • Said switching element 20 may be, for example, an IGBT.
  • the collector of the switching element 20 may be coupled via a filtering circuitry (comprising one or more capacitors) to the oscillating circuit 25, said oscillating circuit 25 comprising the induction element 21, preferably constituted by an induction coil, and the capacitor 22.
  • the power stage 10 may comprise a quasi-resonant power stage architecture.
  • the induction element 21 may be coupled with the bridge rectifier 13 in order to power the oscillating circuit 25 by the mains supply network.
  • the voltage at the collector of the switching element 20 is suddenly decreasing and after closing the switching element 20, the electrical voltage of the collector of the switching element 20 is oscillating.
  • the collector of the switching element 20 is chosen as first monitoring point 23 to derive the oscillating voltage Vc, because the voltage of the collector of the switching element 20 directly corresponds to the voltage drop over the switching element 20.
  • the emitter of said switching element 20 is directly coupled to ground.
  • the second monitoring point 24 for deriving the reference voltage Vdc may be the electrical node between the induction element 21 and the capacitor 22.
  • the second monitoring point 24 is constituted by the direct electrical connection between the induction element 21 and the capacitor 22.
  • the reference voltage Vdc forms an appropriate signal for deriving the trigger signal TS by comparing the oscillating voltage Vc with the reference voltage Vdc.
  • Fig. 4 and 5 show signal diagrams of the enabling signal P, the reference voltage Vdc, the oscillating voltage Vc and the trigger signal TS. It is worth mentioning that the signal illustrations of the enabling signal P and the trigger signal TS are shifted against the oscillating voltage Vc and the reference voltage Vdc for the sake of a better recognisability.
  • the oscillating voltage Vc is sharply decreasing until the enabling signal P (i.e. the positive pulse of the enabling signal P) is low because the enabling signal P enables a current flow through the switching element 20.
  • the oscillating voltage Vc starts an oscillating cycle, i.e. the oscillating voltage Vc is rising to a maximum value and after passing the maximum value decreasing.
  • the oscillating voltage Vc comprises in a first period of time t1 a voltage value lower than the reference voltage Vdc, in a second period of time t2 voltage value higher than the reference voltage Vdc and in a third period of time t3 of voltage value lower than the reference voltage Vdc.
  • the trigger generation unit receiving said oscillating voltage Vc and said reference voltage Vdc may generate said trigger signal TS by comparing the voltage values of the oscillating voltage Vc and said reference voltage Vdc.
  • the trigger generation unit 12 may comprise a comparator providing a trigger signal TS with a high level when the oscillating voltage Vc is lower than the reference voltage Vdc.
  • the comparator may provide a trigger signal TS with a low level when the oscillating voltage Vc is higher than the reference voltage Vdc.
  • the inverse generation of the trigger signal TS may be possible, i.e.
  • the comparator may provide a trigger signal TS with a high level when the oscillating voltage Vc is higher than the reference voltage Vdc and may provide a trigger signal TS with a low level when the oscillating voltage Vc is lower than the reference voltage Vdc.
  • the delay unit 11.1 may use said rising edge of the trigger signal TS for starting a delay timer. Said delay timer may count down a certain delay time ⁇ t in order to launch the next pulse of the enabling signal P in close proximity to the minimum value of the oscillating voltage Vc. After expiration of the delay time ⁇ t, the delay unit 11.1 may provide a trigger to the control unit 11 in order to launch the next pulse of the enabling signal P.
  • the control unit 11.1 may be configured to adapt the pulse duration ⁇ P of the pulses of the enabling signal P based on the power request of the user for the respective heating zone 2 correlated with the induction element 21.
  • the pulse duration ⁇ P of the pulses of the enabling signal P has also strong effect on the amplitude of the oscillating voltage Vc. In case that a fixed delay time ⁇ t would be used, the timing of launching the following pulse of the enabling signal P may be inappropriate in most cases.
  • the delay unit 11.1 may be configured to adapt the delay time ⁇ t according to the requested power, respectively, according to the pulse duration ⁇ P.
  • the control unit 11 may receive a power request of the user interface 3 and may adapt the pulse duration ⁇ P according to the requested power. The control unit 11 may provide the requested power value and/ or the pulse duration ⁇ P derived from said requested power value to the delay unit 11.1.
  • the delay unit may comprise a processing unit adapted to calculate an appropriate delay time ⁇ t based on the received requested power value and/ or the pulse duration ⁇ P.
  • the delay unit may comprise a look-up table comprising a plurality of table entries, each table entry correlating a certain delay time value with a requested power value and/ or a pulse duration value.
  • the delay unit 11.1 is able to adapt the delay time ⁇ t based on the received requested power value and/ or the pulse duration value.
  • the induction hob further comprises a power estimation unit 15.
  • Said power estimation unit 15 may be adapted to derive information regarding the energy consumed by the power stage 10.
  • the power estimation unit 15 may be coupled with the power stage 10 in order to receive information about the power consumption of the power stage 10 and may further be coupled with the control unit 11 in order to provide information regarding the power consumption of the power stage 10 to the control unit.
  • the power estimation unit 15 may receive information regarding the electrical current flowing through the induction element 21 in order to determine or estimate the power consumption of the power stage 10.
  • the information regarding the power consumption of the power stage 10 may be transmitted to the control unit 11 in order to compare the power consumption determined by the power estimation unit 15 with the power request according to the user demand.
  • the control unit 11 may adapt the pulse duration ⁇ P in order to adjust the power consumption of the power stage 10 to the requested power.
  • a feedback control loop is provided for adapting the power consumption of the power stage 10 according to the power requested by the user via the user interface 3.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Power Conversion In General (AREA)
EP15176584.9A 2014-09-18 2015-07-14 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque Withdrawn EP2999306A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15176584.9A EP2999306A1 (fr) 2014-09-18 2015-07-14 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14185258.2A EP2999303B1 (fr) 2014-09-18 2014-09-18 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque
EP15176584.9A EP2999306A1 (fr) 2014-09-18 2015-07-14 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque

Publications (1)

Publication Number Publication Date
EP2999306A1 true EP2999306A1 (fr) 2016-03-23

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EP14185258.2A Not-in-force EP2999303B1 (fr) 2014-09-18 2014-09-18 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque
EP15176584.9A Withdrawn EP2999306A1 (fr) 2014-09-18 2015-07-14 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque

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EP14185258.2A Not-in-force EP2999303B1 (fr) 2014-09-18 2014-09-18 Plaque de cuisson à induction et procédé pour faire fonctionner une telle plaque

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109511188A (zh) * 2017-09-14 2019-03-22 佛山市顺德区美的电热电器制造有限公司 电磁加热装置、电磁加热系统及其的控制方法
CN110446287A (zh) * 2018-05-04 2019-11-12 佛山市顺德区美的电热电器制造有限公司 电烹饪器具及电烹饪器具的igbt控制装置、方法
EP3836753A1 (fr) * 2019-12-13 2021-06-16 Electrolux Appliances Aktiebolag Procédé et système pour commander un convertisseur qr dans un appareil de cuisson à induction
CN114830823A (zh) * 2019-12-13 2022-07-29 伊莱克斯家用电器股份公司 用于控制感应烹饪器具中的qr逆变器的方法和系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4151387A (en) * 1971-04-06 1979-04-24 Environment/One Corporation Metal base cookware induction heating apparatus having improved power control circuit for insuring safe operation
GB2025094A (en) * 1978-06-23 1980-01-16 Matsushita Electric Industrial Co Ltd Induction heating control apparatus
US5329100A (en) * 1992-02-11 1994-07-12 Goldstar Co., Ltd. Circuit for compensating for output of high frequency induction heating cooker
EP1592285A1 (fr) * 2004-04-27 2005-11-02 Lg Electronics Inc. Dispositif de commande d'un onduleur pour un appareil de cuisson à induction
US20080179312A1 (en) * 2006-12-04 2008-07-31 Panasonic Ev Energy Co., Ltd. Heater controller
EP2209197A1 (fr) * 2009-01-16 2010-07-21 Whirpool Corporation Procédé de contrôle de convertisseurs de puissance résonants dans des systèmes de chauffage par induction et système de chauffage par induction pour réaliser ledit procédé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4151387A (en) * 1971-04-06 1979-04-24 Environment/One Corporation Metal base cookware induction heating apparatus having improved power control circuit for insuring safe operation
GB2025094A (en) * 1978-06-23 1980-01-16 Matsushita Electric Industrial Co Ltd Induction heating control apparatus
US5329100A (en) * 1992-02-11 1994-07-12 Goldstar Co., Ltd. Circuit for compensating for output of high frequency induction heating cooker
EP1592285A1 (fr) * 2004-04-27 2005-11-02 Lg Electronics Inc. Dispositif de commande d'un onduleur pour un appareil de cuisson à induction
US20080179312A1 (en) * 2006-12-04 2008-07-31 Panasonic Ev Energy Co., Ltd. Heater controller
EP2209197A1 (fr) * 2009-01-16 2010-07-21 Whirpool Corporation Procédé de contrôle de convertisseurs de puissance résonants dans des systèmes de chauffage par induction et système de chauffage par induction pour réaliser ledit procédé

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109511188A (zh) * 2017-09-14 2019-03-22 佛山市顺德区美的电热电器制造有限公司 电磁加热装置、电磁加热系统及其的控制方法
CN110446287A (zh) * 2018-05-04 2019-11-12 佛山市顺德区美的电热电器制造有限公司 电烹饪器具及电烹饪器具的igbt控制装置、方法
CN110446287B (zh) * 2018-05-04 2022-02-25 佛山市顺德区美的电热电器制造有限公司 电烹饪器具及电烹饪器具的igbt控制装置、方法
EP3836753A1 (fr) * 2019-12-13 2021-06-16 Electrolux Appliances Aktiebolag Procédé et système pour commander un convertisseur qr dans un appareil de cuisson à induction
WO2021115809A1 (fr) * 2019-12-13 2021-06-17 Electrolux Appliances Aktiebolag Procédé et système pour commander un onduleur qr dans un appareil de cuisson à induction
CN114830823A (zh) * 2019-12-13 2022-07-29 伊莱克斯家用电器股份公司 用于控制感应烹饪器具中的qr逆变器的方法和系统
CN114830823B (zh) * 2019-12-13 2026-01-02 伊莱克斯家用电器股份公司 用于控制感应烹饪器具中的qr逆变器的方法和系统
US12532388B2 (en) 2019-12-13 2026-01-20 Electrolux Appliances Aktiebolag Method and system to control a QR-inverter in a induction cooking appliance
AU2020400849B2 (en) * 2019-12-13 2026-01-22 Electrolux Appliances Aktiebolag Method and system to control a QR-inverter in a induction cooking appliance

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EP2999303B1 (fr) 2018-11-14
EP2999303A1 (fr) 2016-03-23

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