EP2932794A1 - Surface de cuisson à chauffage par induction - Google Patents

Surface de cuisson à chauffage par induction

Info

Publication number
EP2932794A1
EP2932794A1 EP13826925.3A EP13826925A EP2932794A1 EP 2932794 A1 EP2932794 A1 EP 2932794A1 EP 13826925 A EP13826925 A EP 13826925A EP 2932794 A1 EP2932794 A1 EP 2932794A1
Authority
EP
European Patent Office
Prior art keywords
voltage
current
induction coil
coil
comparator
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.)
Granted
Application number
EP13826925.3A
Other languages
German (de)
English (en)
Other versions
EP2932794B1 (fr
Inventor
Namik Yilmaz
Hakan Suleyman YARDIBI
Metin ASTOPRAK
Metin OZTURK
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP2932794A1 publication Critical patent/EP2932794A1/fr
Application granted granted Critical
Publication of EP2932794B1 publication Critical patent/EP2932794B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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 induction heating cooktop wherein it is detected whether the vessel placed thereon is at the appropriate heating position.
  • the induction heating cooktop functions according to the principle of heating a ferromagnetic cookware like cast iron or steel, for example a pot, with the magnetic field effect generated by the induction coil.
  • a ferromagnetic cookware like cast iron or steel, for example a pot
  • MOSFET power switch
  • HBSR half bridge series resonant circuits formed by using two power switches and two resonant capacitors
  • SSQR single switch quasi-resonant
  • the single switch quasi-resonant circuits are preferred due to cost advantage; however, they operate in a narrower energy frequency range and can deliver power to the cookware only within a certain voltage and power range.
  • problems are encountered in detecting different kinds of cookware and the changes in position of the cookware on the cooktop burner. Furthermore, difficulties arise in detecting the position of the cookware in mains voltage fluctuations and at different temperature conditions.
  • multi coil – multi zone structure is used, heating can be maintained on the entire cooktop surface and flexibility is provided for the user.
  • induction coils of various shapes and sizes are situated on the cooktop surface.
  • the detection of the cookware position and furthermore the characteristic features like the diameter, type and the ferromagnetic properties during power transmittance to the cookware is quite critical for products wherein multi coil and also the single switch quasi-resonant circuits (SSQR) are used.
  • SSQR single switch quasi-resonant circuits
  • the European Patent Application No. EP2282606 relates to an induction apparatus control method.
  • the presence or absence of the vessel on the induction coil, the resistivity and the dimensions thereof are detected by comparing the resonance voltage with a predetermined fixed reference voltage in the control unit.
  • JP2011023163 a rice cooker is explained wherein existence or nonexistence of a pan on the induction heater or whether or not the pan is located at a designated position is detected under unstable power source voltage conditions.
  • the aim of the present invention is the realization of an induction heating cooktop wherein the position of the vessel placed on the induction coil is detected precisely under variable mains input voltage and temperature conditions.
  • the induction heating cooktop realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a bridge rectifier that converts the alternative mains current into direct current, a resonant circuit having an induction coil and a resonant capacitor, a power switch, for example an IGBT, that drives the resonant circuit, a collector node whereon resonance voltage is generated, and a current detection circuit connected in series to the induction coil and providing the monitoring of the coil current, transferred from the induction coil to the vessel, by converting into voltage data.
  • a bridge rectifier that converts the alternative mains current into direct current
  • a resonant circuit having an induction coil and a resonant capacitor
  • a power switch for example an IGBT
  • a collector node whereon resonance voltage is generated
  • a current detection circuit connected in series to the induction coil and providing the monitoring of the coil current, transferred from the induction coil to the vessel, by converting into voltage data.
  • the current detection circuit is formed of a current sensing resistor connected in series to the induction coil or formed of a current transformer connected in series to the induction coil and a current sensing resistor connected in parallel to the secondary side of the current transformer.
  • the control unit determines whether or not the vessel is present on the induction coil or whether or not alignment of the vessel on the induction coil is appropriate by comparing the phase difference time between the coil current detected by the current detection circuit and converted into voltage data and the resonance voltage formed between the collector and emitter of the power switch with a threshold phase difference time recorded in its memory.
  • a first comparator is connected in parallel to the terminals of the current detection resistor.
  • the first comparator generates square wave output signals by detecting the zero crossings of the coil current.
  • a second comparator connected to the collector node and the DC-line, generates square wave output signals by comparing the resonance voltage with the DC-line voltage.
  • Voltage dividers are connected to the collector node and the DC-line and the resonance voltage and the DC-line voltage are compared by being decreased to a measurable low level.
  • a logical AND gate whereto the first comparator and the second comparator are connected, generates logical-1 output signals when the output signals of both the first comparator and the second comparator are logical-1.
  • the control unit determines the absence of the vessel on the induction coil or that the vessel has been slid from over the induction coil more than permitted and interrupts the induction coil current if the period of the logical-1 output signal of the logical AND gate is smaller than the threshold signal time recorded in its memory.
  • Figure 1 – is the schematic view of the control circuit of an induction heating cooktop.
  • Figure 2 – is the schematic view of the control circuit of an induction heating cooktop in an embodiment of the present invention.
  • Figure 3 – is the graphic showing the change with respect to time in the induction coil current and the voltage generated on the power switch in the control circuit of the induction heating cooktop.
  • Figure 4 – is the graphic showing the output signals of the first and second comparators used in the control circuit of the induction heating cooktop.
  • Figure 5 — is the graphic showing the output signals of the logical AND gate used in the control circuit of the induction heating cooktop.
  • the induction heating cooktop (1) comprises a bridge rectifier (2) that converts the alternating current received from the mains into direct current, a high frequency filter circuit (3) disposed at the outlet of the bridge rectifier (2) comprising a DC-line capacitor and a DC-line inductor that delivers DC voltage within a certain frequency range by filtering the voltage generated at the DC-line, a resonant circuit (6) having an induction coil (4) that provides the heating of the vessel (K) placed thereon and a resonant capacitor (5) connected in parallel to the induction coil (4), a power switch (7), for example an IGBT (Insulated Gate Bipolar Transistor), having a collector and an emitter, that drives the resonant circuit (6), that is in conducting state in the turned-off position, providing the resonant capacitor (5) to be charged during the turn-off time, that interrupts conduction in the turned-on position, providing the resonant capacitor (5) to be discharged during the non-conduction (turned-on) time and that provides the
  • the conduction times wherein the power switch (7) is in turned-off position are determined by the power scale setting made by the user.
  • the non-conduction times wherein the power switch (7) is in the turned-on position are determined by the control unit (11) depending on the characteristic features of the vessel (K) placed on the induction coil (4), alignment of the vessel (K) on the induction coil (4), AC mains voltage conditions and the temperature of the vessel (K).
  • the resonant capacitor (5) is first charged then discharged during the non-conduction (turned-on) times of the power switch (7) and the coil current (I L ) passes through the freewheeling diode (8) while the resonant capacitor (5) is being discharged.
  • Resonance voltage (Vce) is generated at the collector node (9) and energy is transferred from the induction coil (4) to the vessel (K).
  • the power switch (7) is changed from the turned-on position to the turned-off position, in other words from the non-conducting current state to the current conducting state and energy is stored in the induction coil (4) during the conduction time while the power switch (7) is in the turned-off position.
  • the induction heating cooktop (1) of the present invention comprises a current detection circuit (12) situated in the resonant circuit (6), connected in series to the induction coil (4), that converts the coil current (I L ) transferred from the induction coil (4) to the vessel (K) into voltage data in the non-conduction times wherein the power switch (7) is in the turned-on position and provides the coil current (I L ) to be monitored and the control unit (11) that determines whether or not the vessel (K) is present on the induction coil (4) or whether alignment of the vessel (K) on the induction coil (4) is appropriate by comparing the phase difference time (T) between the coil current (I L ), converted into voltage data received from the current detection circuit (12) and the resonance voltage (Vce) generated on the collector node (9) with a threshold phase difference time (T-threshold) recorded in its memory.
  • T phase difference time
  • the control unit (11) detects the coil current (I L ) in the resonant circuit (6) as converted into voltage data by means of the current detection circuit (12), and calculates the phase difference time (T) between the coil current (I L ) and the resonance voltage (Vce) during the non-conduction times of the power switch (7) by comparing with the resonance voltage (Vce).
  • the control unit (11) decides that the vessel (K) has been “slid” or “lifted” from over the induction coil (4) depending on the phase difference time (T) and interrupts current transmission to the induction coil (4).
  • the current detection circuit (12) comprises a current detection resistor (13) that is connected in series to the induction coil (4) in the resonant circuit (6) and that converts the coil current (I L ) into voltage data ( Figure 2).
  • the control unit (11) receives the voltage data relating to the coil current (I L ) from the terminals of the current detection resistor (13).
  • the current detection circuit (12) comprises a current transformer (14) connected in series to the induction coil (4) in the resonant circuit (6) and decreasing the coil current (I L ) to a level that can be detected by the control unit (11) and the current detection resistor (13) connected in parallel to the secondary side of the current transformer (14) ( Figure 1).
  • the induction heating cooktop (1) comprises a first comparator (15) connected in parallel to the current detection resistor (13), generating digital “1” and “0” square wave output signals by detecting the zero crossings (ZC) of the coil current (I L ) and thus providing the coil current (I L ) to be monitored with digital data, a second comparator (16) connected to the collector node (9) and the DC-line at the outlet of the filter circuit (3), that compares the resonance voltage (Vce) with DC-line voltage (Vdc) and provides the resonance voltage (Vce) to be monitored independently from mains voltage fluctuations and a logical AND gate (17) that overlaps the output signals of the first comparator (15) and the second comparator (16) and sends as one signal to the control unit (11) as a single signal.
  • a first comparator connected in parallel to the current detection resistor (13), generating digital “1” and “0” square wave output signals by detecting the zero crossings (ZC) of the coil current (I L ) and thus providing the coil current (I
  • the first comparator (15) generates logical-1 output signals (S1) between the zero crossing (ZC) points of the coil current (I L ) in the non-conduction (turned-on) times of the power switch (7) when the induction coil (4) transfers energy to the vessel (K) ( Figure 4).
  • the second comparator (16) generates logical-1 output signals (S2) in situations where the resonance voltage (Vce) is equalized with the DC-line voltage (Vdc) and turns to positive with respect to the DC-line voltage (Vdc) by comparing the resonance voltage (Vce) with the DC-line voltage (Vdc) ( Figure 4).
  • the AND gate (17) generates logical-1 output signal (S3) in the case when the output signals (S1, S2) of both the first comparator (15) and the second comparator (16) are logical-1 ( Figure 5).
  • the duration of the logical-1 output signal of the AND gate (17) is equal to the phase difference time (T) of the coil current (I L ) and the resonance voltage (Vce).
  • the AND gate (17) generates logical-0 signal when the output signal of at least one of the first comparator (15) and the second comparator (16) is logical-0.
  • the control unit (11) determines that the vessel (K) is not present on the induction coil (4) or the vessel (K) is not appropriately aligned on the induction coil (4), in other words, that the vessel (K) is “slid” or “lifted”, if the logical-1 output signal time (T) of the AND gate (17) is smaller than the threshold signal time (T-threshold) (T ⁇ T-threshold) recorded in its memory and interrupts the current of the induction coil (4).
  • the induction heating cooktop (1) comprises a first voltage divider (18) having resistors (R1, R2) connected in series to the collector node (9) and applying easily measurable, low level resonance voltage (Vce) to the second comparator (16) by dividing the resonance voltage (Vce) and a second voltage divider (19) having resistors (R3, R4) connected in series to the DC-line and applying easily measurable, low level DC voltage (Vdc) to the second comparator (16) by dividing the DC voltage (Vdc).
  • induction heating cooktops (1) called “flexi-zone” or “multi-zone”, having more than one induction coil (4), each driven by a single power switch (7), the presence or absence of the vessel (K) on the induction coil (4) and whether or not the vessel (K) is in the appropriate position is determined during the heating process and energy is transferred to the vessel (K) in a safe manner under variable mains voltage and temperature conditions.
  • the power switch (7) and the other electronic circuit elements are prevented from being damaged.

Landscapes

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

Abstract

L'invention porte sur une surface de cuisson à chauffage par induction (1) qui comprend : un circuit résonant (6) comportant une bobine d'induction (4) et une capacité résonante (5) reliée en parallèle à la bobine d'induction (4) ; un interrupteur d'alimentation (7), par exemple un IGBT, qui commande le circuit résonant (6) ; une diode libre (8) reliée en parallèle à l'interrupteur d'alimentation (7) ; un nœud collecteur (9) sur lequel est produite une tension de résonance (Vce) pendant les périodes de non-conduction (marche) de l'interrupteur d'alimentation (7) ; un circuit d'attaque (10) qui permet de commander l'interrupteur d'alimentation (7) ; et une unité de commande (11) qui régule le fonctionnement de l'interrupteur d'alimentation (7) en commandant le circuit d'attaque (10), la présence d'un récipient (K) placé sur la bobine d'induction (4) et la position appropriée de ce dernier étant déterminées dans des conditions de tension de secteur et de température variables.
EP13826925.3A 2012-12-11 2013-12-11 Surface de cuisson à chauffage par induction Active EP2932794B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201214455 2012-12-11
PCT/EP2013/076198 WO2014090864A1 (fr) 2012-12-11 2013-12-11 Surface de cuisson à chauffage par induction

Publications (2)

Publication Number Publication Date
EP2932794A1 true EP2932794A1 (fr) 2015-10-21
EP2932794B1 EP2932794B1 (fr) 2017-03-08

Family

ID=50064533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13826925.3A Active EP2932794B1 (fr) 2012-12-11 2013-12-11 Surface de cuisson à chauffage par induction

Country Status (3)

Country Link
EP (1) EP2932794B1 (fr)
CN (1) CN105103652B (fr)
WO (1) WO2014090864A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3474629A1 (fr) * 2017-10-19 2019-04-24 LG Electronics Inc. Dispositif de chauffage par induction et de transfert de puissance sans fil ayant une précision de détection de courant résonant améliorée

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
CN108633117B (zh) * 2017-03-23 2024-08-27 佛山市顺德区美的电热电器制造有限公司 检测被加热装置的电路以及电磁加热设备和家用电器
TR201721881A2 (tr) * 2017-12-26 2019-07-22 Arcelik As Yüksek frekans üreteci̇ i̇le beslenen bobi̇n i̇çeren bi̇r metal algilama si̇stemi̇
KR20210063897A (ko) * 2019-11-25 2021-06-02 엘지전자 주식회사 사용자의 개입 없이 특정 기능을 제공하는 전기 레인지
KR20210066227A (ko) * 2019-11-28 2021-06-07 엘지전자 주식회사 사용자의 제스처에 따라 특정 기능을 제공하는 전기 레인지
EP3836753B1 (fr) * 2019-12-13 2023-09-06 Electrolux Appliances Aktiebolag Procédé et système pour commander un convertisseur qr dans un appareil de cuisson à induction
KR20210112191A (ko) 2020-03-04 2021-09-14 엘지전자 주식회사 영전압 스위칭 실패 감지 회로
WO2022013008A1 (fr) * 2020-07-17 2022-01-20 BSH Hausgeräte GmbH Dispositif de table de cuisson
WO2022013007A1 (fr) * 2020-07-17 2022-01-20 BSH Hausgeräte GmbH Ensemble plaque de cuisson à induction
KR20220128885A (ko) * 2021-03-15 2022-09-22 엘지전자 주식회사 유도 가열 장치 및 유도 가열 장치의 제어 방법
US20230217555A1 (en) * 2022-01-05 2023-07-06 Lg Electronics Inc. Induction heating device
JP2024075069A (ja) * 2022-11-22 2024-06-03 三星電子株式会社 誘導加熱装置及び誘導加熱装置用プログラム

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KR950007600A (ko) * 1993-08-10 1995-03-21 문정환 전자조리기의 소물감지회로
CN102428750B (zh) * 2009-05-26 2013-09-18 三菱电机株式会社 感应加热烹调器以及感应加热方法
JP2011023163A (ja) * 2009-07-14 2011-02-03 Panasonic Corp 炊飯器

Non-Patent Citations (1)

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See references of WO2014090864A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3474629A1 (fr) * 2017-10-19 2019-04-24 LG Electronics Inc. Dispositif de chauffage par induction et de transfert de puissance sans fil ayant une précision de détection de courant résonant améliorée
US11064576B2 (en) 2017-10-19 2021-07-13 Lg Electronics Inc. Induction heating and wireless power transferring device having improved resonant current detection accuracy

Also Published As

Publication number Publication date
CN105103652A (zh) 2015-11-25
EP2932794B1 (fr) 2017-03-08
CN105103652B (zh) 2017-03-22
WO2014090864A1 (fr) 2014-06-19

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