EP3042541B1 - 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
EP3042541B1
EP3042541B1 EP13756895.2A EP13756895A EP3042541B1 EP 3042541 B1 EP3042541 B1 EP 3042541B1 EP 13756895 A EP13756895 A EP 13756895A EP 3042541 B1 EP3042541 B1 EP 3042541B1
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EP
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Prior art keywords
resonant
charging
diode
circuit
capacitor
Prior art date
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Not-in-force
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EP13756895.2A
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German (de)
English (en)
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EP3042541A1 (fr
Inventor
Metin OZTURK
Metin ASTOPRAK
Ulas OKTAY
Namik Yilmaz
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Arcelik AS
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Arcelik AS
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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.
  • US 5 648 008 discloses an induction heating cooker comprising a full-wave rectifier rectifying the alternative signal, a filter inductance and a filter capacitor at the output of the full-wave rectifier, a parallel resonant circuit having a resonant inductor and a resonant capacitor disposed in parallel, a power switching device in parallel with a reverse-biased freewheeling diode, said power switching device being connected to a collector node whereon a resonant voltage is generated and operating such that the resonant inductor and the resonant capacitor involve in energy exchange, said induction heating cooker further comprising a control unit regulating the operation of said power switching device and a drive circuit that drives the same.
  • 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.
  • 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) and a charge detection circuit (12), the charging circuit (11) being in parallel with said freewheeling diode (8), the charging circuit (11) having a charging diode (13) and a charge reference capacitor (14), the cathode of the charging diode (13) being connected to the cathode of the freewheeling diode (8), the charge reference capacitor (14) being connected to the anode of the charging diode (13) and to the anode of the freewheeling diode (8), wherein the charging diode (13) is forward-biased when said freewheeling diode (8) is in conduction, wherein said charging diode (13) charges the charge reference capacitor (14) and wherein the charge detection circuit (12) detects the voltage between the terminals of said charge reference capacitor (14) and generates a voltage output the duration of the square-wave voltage of which in a cycle is indicative of the electrical load associated with said 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 circuit (11) and a charge detection circuit (12), the charging circuit being in parallel with said freewheeling diode (8), the charging circuit having a charging diode (13) and a charge reference capacitor (14), the cathode of the charging diode (13) being connected to the cathode of the freewheeling diode (8), the charge reference capacitor (14) being connected to the anode of the charging diode (13) and to the anode of the freewheeling diode (8), wherein the charging diode (13) is forward-biased when said freewheeling diode (8) is in conduction, said charging diode (13) charging the 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 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)

Claims (4)

  1. Une cuisinière à chauffage par induction (1) comprenant un redresseur à onde pleine (7) rectifiant le signal alternatif, une inductance de filtre (2) et un condensateur de filtrage (3) à la sortie du redresseur à onde pleine (7), une résonance parallèle comportant une inductance résonnante (5) et un condensateur résonant (6) disposés en parallèle, un dispositif de commutation de puissance (4) en parallèle avec une diode (8) à roue libre polarisée en sens inverse,
    ledit dispositif de commutation de puissance (4) étant connecté à un noeud de collecteur (10) sur lequel une tension de résonance (Vce) est générée et fonctionnant de telle sorte que l'inductance de résonance (5) et le condensateur de résonance (6) impliquent un échange d'énergie, ladite cuisinière à chauffage par induction (1) comprenant en outre une unité de commande régulant le fonctionnement dudit dispositif de commutation de puissance (4) et un circuit de commande qui entraîne celui-ci, caractérisé en ce que;
    ladite cuisinière à chauffage par induction (1) comprend un circuit de charge (11) et un circuit de détection de charge (12), le circuit de charge (11) étant parallèle à ladite diode de roue libre (8), le circuit de charge (11) comportant une diode de charge (13) et un condensateur de référence de charge (14), la cathode de la diode de charge (13) étant reliée à la cathode de la diode de roue libre (8),
    le condensateur de référence de charge (14) étant relié à l'anode de la diode de charge (13) et à l'anode de la diode de roue libre (8), dans lequel la diode de charge (13) étant polarisée vers l'avant lorsque ladite diode de roue libre (8) est en conduction, dans lequel ladite diode de charge (13) charge le condensateur de référence de charge (14) et dans lequel le circuit de détection de charge (12) détecte la tension entre les bornes dudit condensateur de référence de charge (14) et génère une sortie de tension dont la durée de l'onde carrée de la tension dans un cycle est indicative de la charge électrique associée à ladite inductance résonante (5).
  2. Une cuisinière à chauffage par induction (1) selon la revendication 1, caractérisée en ce que ledit dispositif de commutation de puissance (4) est un IGBT sur un noeud de collecteur (10) dont la tension de résonance (Vce) est générée.
  3. Une cuisinière à chauffage par induction (1) selon la revendication 1 ou 2, caractérisée en ce que ladite borne positive (14) du condensateur de référence de charge est reliée à la base d'un transistor de jonction bipolaire NPN (Q1) dont le collecteur est relié à la base d'un transistor de jonction bipolaire PNP (Q2) dont l'émetteur est relié à la borne positive Vcc.
  4. Procédé de détection de présence et de positionnement correct d'un récipient de cuisson ferromagnétique dans une cuisinière à chauffage par induction (1), ladite cuisinière à chauffage par induction (1) comprenant un redresseur à onde complète (7), une inductance de filtre (2) et un condensateur de nivellage (3), un circuit résonnant parallèle comportant une inductance résonante (5) et un condensateur résonant (6) disposés en parallèle, un IGBT en parallèle avec une diode à roue libre (8) à polarisation inverse, ledit IGBT étant connecté à un noeud collecteur (10) sur laquelle une tension résonnante (Vce) est générée et fonctionnant de telle sorte que l'inductance résonante (5) et le condensateur résonant (6) impliquent dans l'échange d'énergie, ladite cuisinière à chauffage par induction (1) comprenant en outre une unité de commande régulant le fonctionnement du dit dispositif de commutation de puissance (4) et un circuit de commande qui entraîne celui-ci, le procédé de détection de présence et de positionnement correct d'un récipient de cuisson ferromagnétique dans une cuisinière à chauffage par induction (1) comprend les étapes consistant à:
    a) surveiller la zone de croisement du courant de diode de roue libre (8) au moyen d'un circuit de charge (11) et d'un circuit de détection de charge (12), le circuit de charge étant parallèle à ladite diode de roue libre (8), le circuit de charge ayant une diode de charge (13) et un condensateur de référence de charge (14), la cathode de la diode de charge (13) étant connectée à la cathode de la diode de roue libre (8), le condensateur de référence de charge (14) étant connecté à l'anode de la diode de charge (13) et à l'anode de la diode de roue libre (8) est en conduction, ladite diode de charge (13) chargeant le condensateur de référence de charge (14) et,
    b) surveiller la tension entre les bornes dudit condensateur de référence de charge (14) au moyen d'un circuit de détection de charge (14) générant une sortie de tension dont la durée de la tension d'onde carrée dans un cycle est indicative de la charge électrique associée à la bobine d'induction.
EP13756895.2A 2013-09-03 2013-09-03 Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine Not-in-force EP3042541B1 (fr)

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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EP3042541A1 EP3042541A1 (fr) 2016-07-13
EP3042541B1 true EP3042541B1 (fr) 2017-06-21

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EP13756895.2A Not-in-force EP3042541B1 (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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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10605464B2 (en) 2012-10-15 2020-03-31 Whirlpool Corporation Induction cooktop
US10893579B2 (en) 2017-07-18 2021-01-12 Whirlpool Corporation Method for operating an induction cooking hob and cooking hob using such method
US10993292B2 (en) 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices
US11212880B2 (en) 2012-10-15 2021-12-28 Whirlpool Emea S.P.A. Induction cooking top
EP3700297B1 (fr) 2017-11-23 2022-03-02 Samsung Electronics Co., Ltd. Dispositif de cuisson et son procédé de commande

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CN108702828B (zh) 2015-12-28 2020-03-06 Dialog半导体（英国）有限公司 固态照明组件
KR102069580B1 (ko) 2017-06-26 2020-01-23 엘지전자 주식회사 용기 감지 센서 및 용기 감지 센서를 포함하는 유도 가열 장치
KR102069583B1 (ko) * 2017-06-26 2020-01-23 엘지전자 주식회사 유도 가열 장치 및 유도 가열 장치의 용기 감지 방법
US20190327792A1 (en) 2018-04-23 2019-10-24 Whirlpool Corporation Control circuits and methods for distributed induction heating devices
FR3092464B1 (fr) * 2019-02-06 2023-04-28 Groupe Brandt Procédé de détermination d’une puissance minimale continue induite dans un récipient.
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

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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

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10605464B2 (en) 2012-10-15 2020-03-31 Whirlpool Corporation Induction cooktop
US11212880B2 (en) 2012-10-15 2021-12-28 Whirlpool Emea S.P.A. Induction cooking top
US11655984B2 (en) 2012-10-15 2023-05-23 Whirlpool Corporation Induction cooktop
US10893579B2 (en) 2017-07-18 2021-01-12 Whirlpool Corporation Method for operating an induction cooking hob and cooking hob using such method
US10993292B2 (en) 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
EP3700297B1 (fr) 2017-11-23 2022-03-02 Samsung Electronics Co., Ltd. Dispositif de cuisson et son procédé de commande
US11622422B2 (en) 2017-11-23 2023-04-04 Samsung Electronics Co., Ltd. Cooking apparatus and method of controlling the same
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices

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WO2015032422A1 (fr) 2015-03-12
EP3042541A1 (fr) 2016-07-13

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