WO2015032422A1 - Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine - Google Patents

Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine Download PDF

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Publication number
WO2015032422A1
WO2015032422A1 PCT/EP2013/068191 EP2013068191W WO2015032422A1 WO 2015032422 A1 WO2015032422 A1 WO 2015032422A1 EP 2013068191 W EP2013068191 W EP 2013068191W WO 2015032422 A1 WO2015032422 A1 WO 2015032422A1
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WO
WIPO (PCT)
Prior art keywords
resonant
parallel
capacitor
voltage
induction heating
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Application number
PCT/EP2013/068191
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English (en)
Inventor
Metin OZTURK
Metin ASTOPRAK
Ulas OKTAY
Namik Yilmaz
Original Assignee
Arcelik Anonim Sirketi
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
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to PCT/EP2013/068191 priority Critical patent/WO2015032422A1/fr
Priority to EP13756895.2A priority patent/EP3042541B1/fr
Publication of WO2015032422A1 publication Critical patent/WO2015032422A1/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
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an improved quasi-resonant induction heater having a cookware presence and position detection circuit.
  • the induction heating cooker operates based on the process of heating a ferromagnetic material by electromagnetic induction where eddy currents are to be induced and resistance provides heat dissipation within said ferromagnetic material, i.e. a cooking vessel in the form of a pot or pan.
  • induction heating By induction heating, high-frequency alternating current is passed through a coil upon which a magnetic field of the same frequency is induced.
  • the internal resistance of the pan causes heat dissipation due to Joule effect and energy transfer is interrupted once the pan is removed from the cooktop.
  • the energy efficiency of induction heating cookers is considerably high since there is no transfer of heat energy between the hob and the cookware and heat energy lost in the air is minimal.
  • a resonant converter in an induction heater circuit topology typically consists of a capacitor, an inductor and resistance. To this end, when power is supplied to the resonant tank, electric energy is stored in the inductor and transferred to the capacitor. Resonance therefore occurs while the inductor and the capacitor involve in energy exchange.
  • the resonant converter can be a half-bridge series resonant converter or a quasi-resonant converter.
  • a quasi-resonant converter exhibits certain advantages over a half-bridge series resonant converter especially due to its simpler circuit design having only one power switching device compared to the half-bridge series resonant converter whose overall operation is more complex.
  • the circuit design parameters in a quasi-resonant converter are regarded as a serious cost advantage in this regard.
  • a high-frequency power switch such as an IGBT is accordingly used.
  • a further drawback can be viewed as relevance of the additional parameters such as the ambient temperature, physical and ferromagnetic characteristics of the cooking container or mains voltage fluctuations. These are of critical importance to reach a proper assessment of the presence of the cooking vessel or the correct position thereof. Reliability of the position assessment data is also important in case a multitude of resonant coils are used so that only certain coils can be energized.
  • EP 1 629 698 B1 discloses an induction cooking system including a power inverter, a microprocessor, a protection circuit and a pan detection circuit.
  • the present invention provides a simpler and cheaper circuit solution by which presence and correct position of a cookware on the cooktop can be accurately detected.
  • the present invention provides a quasi-resonant converter circuit for an induction heating cooker having cookware presence and correct position detecting capabilities as provided by the characterizing features defined in Claim 1.
  • Primary object of the present invention is to provide an improved quasi-resonant induction heater having a cookware presence and position detection circuit.
  • the present invention proposes an induction heating cooker capable of sensing presence and correct placement of a ferromagnetic cooking container in an induction heating cooker. It has a bridge rectifier, a DC-line inductance and a DC-line capacitor. A resonant inductor and a resonant capacitor are disposed in parallel so as to be powered by a high-frequency switching device such as an IGBT. The latter is in parallel with a diode as an anti-parallel diode.
  • the induction heating cooker comprises senses presence and appropriate placement of a cooking vessel by monitoring the zero-cross of the freewheeling diode current.
  • a charging diode in parallel with said freewheeling diode in this respect is forward-biased when the freewheeling diode starts conduction.
  • the charging diode charges a charge reference capacitor and the voltage between the terminals of the latter is monitored by means of a charge detection circuit. This latter circuit generates a voltage output, the duration of the square-wave voltage of which in a cycle is indicative of the electrical load associated with the induction coil.
  • Fig. 1 demonstrates a simplified circuit block diagram representation of a power control circuit of an induction heating cooker according to the present invention.
  • Fig. 2 demonstrates a circuit diagram of the power control circuit of an induction heating cooker according to the present invention.
  • Fig. 3 demonstrates the waveforms of the zero-cross of the anti-parallel diode current and the corresponding voltage signal of the charge detection circuit according to the present invention.
  • the present invention proposes a power circuit by which heat energy is induced within a magnetically responsive cooking container.
  • the induction heating cooker (1) of the present invention is supplied with a source of AC voltage.
  • a full-wave bridge rectifier (7) is connected between the AC source and power stage of a resonant inductor (5).
  • the resonant inductor (5) is connected between the output of said full-wave rectifier (7) and a power switching device (4) including a gate (G), a collector (C) and an emitter (E).
  • the resonant capacitor (6) is parallel to the resonant inductor (5) and an anti-parallel diode, i.e. a freewheeling diode (8) is connected parallel to said power switching device (4).
  • the induction heating cooker (1) conventionally comprises an AC signal filtering circuit. Power passing through a filter capacitor (3) serves to the purpose of filtering high frequency current. The voltage of said filter capacitor (3) is converted into a square wave by said high-frequency power switching device (4). According to Ampere’s Law, the square wave provides resonance creating a magnetic field around the resonant inductor (5), that is, the induction coil. The resonant capacitor (6) provided in parallel with said resonant inductor (5) therefore compensates the inductive nature of the latter.
  • the quasi-resonant converter’s power switching device (4) is an insulated gate bipolar transistor (IGBT).
  • IGBT insulated gate bipolar transistor
  • the operating principle of the quasi-resonant converter typically relies on the storage of energy in the resonant inductor (5) when the power switching device (4) is turned on, and transfer of energy from said resonant inductor (5) to a cooking container when the power switching device (4) is turned off. More particularly, when the power switching device (4) is turned off, the resonant voltage (V ce ) increases on the collector node (10) as the resonant capacitor (6) is being discharged.
  • the energy stored in the resonant inductor (5) begins to be transferred to the resonant capacitor (6).
  • the resonant current gradually decreases to zero when the resonant voltage reaches its maximum, meaning that energy transfer from the resonant inductor (5) to the resonant capacitor (6) is terminated.
  • the resonant capacitor (6) starts discharging the energy to the resonant inductor (5).
  • the current completes its cycle by passing through the freewheeling diode (8) connected in parallel to the IGBT.
  • the cookware presence and correct position detection method of the present invention relies on the use of an electronic circuit that generates an output at the moment which said freewheeling diode (8) starts conduction. It is established that the presence and correct position of a cookware can be accurately detected by means of a charge detection circuit (12) detecting the zero-cross of the current of the freewheeling diode (8).
  • Fig. 3 demonstrates the waveforms of the zero-cross of the anti-parallel freewheeling diode (8) current and the corresponding output voltage signal of the charge detection circuit (12) according to the present invention.
  • the resonance diode or the freewheeling diode (8) is forward-biased when the collector voltage of the IGBT, i.e. the resonant voltage (V ce ) becomes negative. Accordingly, when said anti-parallel freewheeling diode (8) is in conduction, a charging diode D1 (13) in parallel with the latter charges a charge reference capacitor C6 (14), by means of which said charge detection circuit (12) generates a voltage output indicative of the zero-cross of the current of the freewheeling diode (8). It is established that the duration of the positive voltage waveform in the voltage output of the charge detection circuit (12) in a cycle varies according to the electrical load.
  • the resistance of the load is calculated as 2,5R-3,5R and the duration of the square wave signal in a cycle is around 3 ⁇ s. Therefore any deviation from this duration will be interpreted as an incorrect position of the cooking container on the induction coil.
  • the charge reference capacitor (14) of the charging circuit (11) is connected to the base of an NPN BJT (bipolar junction transistor) transistor Q1 in the charge detection circuit (12) through base-bias resistors R1, R2 and R3, said transistor Q1 having a load resistor R5.
  • the charge detection circuit (12) comprises a PNP BJT transistor Q2, whose emitter is connected to the positive terminal V cc .
  • the collector of Q1 is connected to the base of Q2.
  • Q2 generates an amplified output signal to be processed by an electronic control unit (not shown), which in turn operates an IGBT driving circuit.
  • the present invention proposes an induction heating cooker (1) comprising a full-wave rectifier (7) rectifying the alternative signal, a filter inductance (2) and a filter capacitor (3) at the output of the full-wave rectifier (7), a parallel resonant circuit having a resonant inductor (5) and a resonant capacitor (6) disposed in parallel and a power switching device (4) in parallel with a reverse-biased freewheeling diode (8).
  • the power switching device (4) is connected to a collector node (10) whereon a resonant voltage (V ce ) is generated and operates such that the resonant inductor (5) and the resonant capacitor (6) involve in energy exchange.
  • Said induction heating cooker (1) further comprises a control unit (not shown) regulating the operation of the power switching device (4) and a drive circuit (15) that drives the same.
  • the induction heating cooker (1) comprises a charging circuit (11) having a charging diode (13) in parallel with the freewheeling diode (8) and which is forward-biased when the freewheeling diode (8) is in conduction, the charging diode (13) charging a charge reference capacitor (14).
  • the cooker further comprises a charge detection circuit (12) detecting the voltage between the terminals of said charge reference capacitor (14) and generating a voltage output indicative of the electrical load associated with the resonant inductor (5).
  • the method of sensing presence and correct placement of a ferromagnetic cooking container in an induction heating cooker (1) comprises the steps of: a) monitoring the zero-cross of the freewheeling diode (8) current by means of a charging diode (13) in parallel with the freewheeling diode (8) and which is forward-biased when the freewheeling diode (8) is in conduction, the charging diode (13) charging a charge reference capacitor (14) and, b) monitoring the voltage between the terminals of the charge reference capacitor (14) by means of a charge detection circuit (12) generating a voltage output, the duration of the square-wave voltage of which in a cycle is indicative of the electrical load associated with the induction coil.
  • the simplistic yet efficient and accurate method of the invention advantageously provides protection against hazardous conditions, such as no load, over current and over voltage.
  • Another principal advantage of the present method stems from the fact that fluctuations in the input parameters such as for instance mains voltage or ambient temperature have no direct impact on the accuracy of the sensing assessment.

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

Abstract

Cette invention concerne une plaque de cuisson à induction (1), comprenant un redresseur pleine onde (7) qui redresse le signal alternatif, une bobine de filtrage (2) et un condensateur de filtrage (3) à la sortie du redresseur pleine onde (7), un circuit résonant parallèle (8) comprenant une bobine de résonance (5) et un condensateur de résonance (6) disposés en parallèle, un dispositif de commutation de puissance (4) relié en parallèle à une diode libre à polarisation inverse (8), ledit dispositif fonctionnant de telle manière que la bobine de résonance (5) et le condensateur de résonance (6) sont impliqués dans un échange d'énergie, le dispositif de commutation de puissance (4) étant connecté à un nœud collecteur (10) sur lequel est générée une tension de résonance (Vce). Ladite plaque de cuisson à induction (1) comprend en outre une unité de commande qui régule le fonctionnement du dispositif de commutation de puissance (4) et un circuit d'attaque qui commande celle-ci.
PCT/EP2013/068191 2013-09-03 2013-09-03 Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine WO2015032422A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2013/068191 WO2015032422A1 (fr) 2013-09-03 2013-09-03 Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine
EP13756895.2A EP3042541B1 (fr) 2013-09-03 2013-09-03 Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/068191 WO2015032422A1 (fr) 2013-09-03 2013-09-03 Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine

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WO2015032422A1 true WO2015032422A1 (fr) 2015-03-12

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EP (1) EP3042541B1 (fr)
WO (1) WO2015032422A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108702828A (zh) * 2015-12-28 2018-10-23 Dialog半导体（英国）有限公司 固态照明组件
EP3422812A1 (fr) * 2017-06-26 2019-01-02 LG Electronics Inc. -1- Dispositif de chauffage par induction et procédé de détection d'un récipient de cuisson sur un dispositif de chauffage par induction
EP3562266A1 (fr) * 2018-04-23 2019-10-30 Whirlpool Corporation Système et procédé de commande de dispositifs de chauffage par induction quasi-résonants
EP3562267B1 (fr) 2018-04-23 2020-09-23 Whirlpool Corporation Circuits et procédés de commande pour dispositifs de chauffage par induction distribués
CN112714519A (zh) * 2019-10-25 2021-04-27 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪器具及其测温方法、计算机可读存储介质
US11153938B2 (en) 2017-06-26 2021-10-19 Lg Electronics Inc. Cooking vessel sensor and induction heating device including a cooking vessel sensor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20120896A1 (it) 2012-10-15 2014-04-16 Indesit Co Spa Piano cottura a induzione
US10605464B2 (en) 2012-10-15 2020-03-31 Whirlpool Corporation Induction cooktop
EP3432682A1 (fr) 2017-07-18 2019-01-23 Whirlpool Corporation Procédé de fonctionnement d'une plaque de cuisson par induction et plaque de cuisson faisant appel à un tel procédé
US10993292B2 (en) 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
KR102373839B1 (ko) 2017-11-23 2022-03-14 삼성전자주식회사 조리 장치 및 그 제어방법
FR3092464B1 (fr) * 2019-02-06 2023-04-28 Groupe Brandt Procédé de détermination d’une puissance minimale continue induite dans un récipient.

Citations (4)

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US4352000A (en) * 1979-08-10 1982-09-28 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
JPH04371108A (ja) * 1991-06-19 1992-12-24 Matsushita Electric Ind Co Ltd 誘導加熱調理器の鍋検知装置
US5648008A (en) * 1994-11-23 1997-07-15 Maytag Corporation Inductive cooking range and cooktop
JP2011181325A (ja) * 2010-03-01 2011-09-15 Toshiba Corp 誘導加熱調理器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352000A (en) * 1979-08-10 1982-09-28 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
JPH04371108A (ja) * 1991-06-19 1992-12-24 Matsushita Electric Ind Co Ltd 誘導加熱調理器の鍋検知装置
US5648008A (en) * 1994-11-23 1997-07-15 Maytag Corporation Inductive cooking range and cooktop
JP2011181325A (ja) * 2010-03-01 2011-09-15 Toshiba Corp 誘導加熱調理器

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10477634B2 (en) 2015-12-28 2019-11-12 Dialog Semiconductor (Uk) Limited Solid state lighting assembly
CN108702828A (zh) * 2015-12-28 2018-10-23 Dialog半导体（英国）有限公司 固态照明组件
US10616985B2 (en) 2015-12-28 2020-04-07 Dialog Semiconductor (Uk) Limited Solid state lighting assembly
US11178732B2 (en) 2017-06-26 2021-11-16 Lg Electronics Inc. Induction heating device and method for sensing a cooking vessel on an induction heating device
US11153938B2 (en) 2017-06-26 2021-10-19 Lg Electronics Inc. Cooking vessel sensor and induction heating device including a cooking vessel sensor
EP3422812A1 (fr) * 2017-06-26 2019-01-02 LG Electronics Inc. -1- Dispositif de chauffage par induction et procédé de détection d'un récipient de cuisson sur un dispositif de chauffage par induction
US11770881B2 (en) 2017-06-26 2023-09-26 Lg Electronics Inc. Cooking vessel sensor and induction heating device including a cooking vessel sensor
US11785680B2 (en) 2017-06-26 2023-10-10 Lg Electronics Inc. Induction heating device and method for sensing a cooking vessel on an induction heating device
EP3562266A1 (fr) * 2018-04-23 2019-10-30 Whirlpool Corporation Système et procédé de commande de dispositifs de chauffage par induction quasi-résonants
EP3562266B1 (fr) 2018-04-23 2020-08-05 Whirlpool Corporation Système et procédé de commande de dispositifs de chauffage par induction quasi-résonants
EP3562267B1 (fr) 2018-04-23 2020-09-23 Whirlpool Corporation Circuits et procédés de commande pour dispositifs de chauffage par induction distribués
CN112714519A (zh) * 2019-10-25 2021-04-27 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪器具及其测温方法、计算机可读存储介质
CN112714519B (zh) * 2019-10-25 2022-12-06 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪器具及其测温方法、计算机可读存储介质

Also Published As

Publication number Publication date
EP3042541A1 (fr) 2016-07-13
EP3042541B1 (fr) 2017-06-21

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