[go: up one dir, main page]

WO2014090872A1 - Table de cuisson à induction - Google Patents

Table de cuisson à induction Download PDF

Info

Publication number
WO2014090872A1
WO2014090872A1 PCT/EP2013/076220 EP2013076220W WO2014090872A1 WO 2014090872 A1 WO2014090872 A1 WO 2014090872A1 EP 2013076220 W EP2013076220 W EP 2013076220W WO 2014090872 A1 WO2014090872 A1 WO 2014090872A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
voltage
vessel
coil
induction
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.)
Ceased
Application number
PCT/EP2013/076220
Other languages
English (en)
Inventor
Metin OZTURK
Namik Yilmaz
Hakan Suleyman YARDIBI
Metin ASTOPRAK
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
Priority to EP13821078.6A priority Critical patent/EP2939500B1/fr
Priority to CN201380065442.8A priority patent/CN105165116A/zh
Publication of WO2014090872A1 publication Critical patent/WO2014090872A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an induction heating cooktop wherein it is detected whether or not the vessel placed thereon is at the appropriate position.
  • the induction heating cooktop functions according to the principle of heating a cast iron or steel ferromagnetic cookware, for example a pot, with the magnetic field effect generated by the induction coil.
  • SSQR single switch quasi-resonant
  • the single switch quasi-resonant circuits (SSQR) 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.
  • induction heating cooktops wherein the single switch quasi-resonant circuits (SSQR) are used, 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. In this type of induction heating cooktops, 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.
  • the position of the vessel placed on the induction coil is generally defined by circular border lines drawn on the cooktop surface. If aligned with the induction coil according to the predetermined border lines, the vessel can be heated efficiently. The user is allowed to slide the vessel outside the said border lines a little and the vessel can be heated at the desired power setting as long as it is in the efficient heating zone.
  • the vessel With the condition of being in the efficient heating zone, the vessel should be heated according to the power setting selected by the user and without being affected by variable mains voltage and temperature conditions and if the vessel is slid outside the efficient heating zone, this situated should be detected and energy transmitted to the vessel should be interrupted. If it is not detected that the vessel is slid outside the efficient heating zone, the vessel cannot be heated according to the selected power setting and the circuit board can be damaged.
  • 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 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, a current monitoring circuit, connected in series to the induction coil, that provides the coil current, passing through the induction coil, to be monitored by converting it into voltage data, and a voltage monitoring circuit that provides the monitoring of the resonant voltage (power switch voltage) generated on the collector node.
  • 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 monitoring circuit connected in series to the induction coil, that provides the
  • the current monitoring circuit comprises a current detection resistor connected in series to the induction coil
  • a current transformer connected in series to the induction coil and a current detection resistor connected in parallel to the secondary side of the current transformer.
  • the voltage monitoring circuit comprises a voltage divider that decreases the resonant voltage, thus enabling easy measurement thereof.
  • the control unit decides that the vessel is inside the efficient heating zone on the upper plate of the cooktop, wherein the vessel is allowed to be slid a little off the level of the induction coil, if the resonant voltage changes monitored by means of the voltage monitoring circuit are smaller than the limit resonant voltage changes prerecorded in its memory for different power scales selected via the user interface.
  • the control unit compensates the induction coil current monitored by means of the current monitoring circuit by increasing the induction coil current if low or decreasing it if high, thus the power transferred to the vessel is enabled to be kept constant as long as the vessel is inside the efficient heating zone even if slid a little off the level of the induction coil.
  • the control unit Upon detecting that the vessel is slid outside the efficient heating zone, the control unit stops the operation of the induction heating cooktop.
  • the control unit keeps the power transferred to the vessel constant in variable mains voltage and temperature conditions in accordance with the heating settings selected via the user interface. By precisely detecting the alignment of the vessel on the induction coil, the power switch that drives the induction coil, and other electronic components are prevented from being damaged.
  • Figure 1 – is the top schematic view of an induction heating cooktop.
  • Figure 2 – is the schematic view of the control circuit of an induction heating cooktop.
  • Figure 3 – is the schematic view of the control circuit of an induction heating cooktop in an embodiment of the present invention.
  • 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) at the outlet of the bridge rectifier (2) and one or more than one induction coil (4) through which the coil current (I L ) passes during the heating of the vessel (K) placed on the upper plate (P) of the induction heating cooktop (1) so as to be inside the efficient heating zone (B).
  • the vessel (K) or other ferromagnetic cooking containers are placed so as to be inside an efficient heating zone (B) that allows them to go a little beyond the border line (S) defining the position thereof at the induction coil (4) level and that provides the efficient heating thereof ( Figure 1).
  • the induction heating cooktop (1) comprises a resonant circuit (6) having 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, an emitter and a freewheeling diode, 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 conduction time, that interrupts conduction in the turned-on position, providing the resonant capacitor (5) to be discharged during the non-conduction time and that provides the power to be delivered from the induction coil (4) to the vessel (K), a collector node (8) whereon resonance voltage (Vce) or in other words the collector-emitter voltage of the power switch (7) is generated during the non-conduction (turn-on) times of the power switch (7), a drive circuit (9) providing the power switch (7) to be driven with the drive voltage (Vge) at the required
  • the vessel (K) placed on the upper plate (P) of the induction heating cooktop (1) stays inside the efficient heating zone (B) having a diameter greater than the border line (S) marked on the upper plate (P)
  • the vessel (K) is heated by receiving constant power in accordance with the heating setting (power scale) selected via the user interface (10).
  • the user is allowed to slide the vessel (K) a little off the induction coil (4) level. If the vessel (K) is slid outside the efficient heating zone (B), the power being transferred from the induction coil (4) to the vessel (K) is interrupted.
  • the conduction times wherein the power switch (7) is in the turned-off position are determined by the heating setting selected via the user interface (10).
  • 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), mains voltage conditions and the temperature of the vessel (K).
  • resonance voltage (Vce) is generated at the collector node (8), the coil current (I L ) passes through the induction coil (4) and energy is transferred to the vessel (K).
  • the induction heating cooktop (1) of the present invention comprises,
  • a current monitoring circuit (12) connected in series to the induction coil (4) and providing the monitoring of the coil current (I L ) by converting it into voltage data during power transmission to the vessel (K),
  • a voltage monitoring circuit (13) connected to the collector node (8) and providing the monitoring of the resonant voltage change ( ⁇ Vce) during power transmission to the vessel (K), and
  • the control unit (11) that decides that the vessel (K) is inside the efficient heating zone (B) and that keeps the coil current (I L ) constant by intervening in the coil current (I L ) monitored by means of the current monitoring circuit (12), thus enables the power transferred to the vessel (K) to be kept constant, if the resonant voltage changes ( ⁇ Vce) monitored by means of the voltage monitoring circuit (13) are smaller than the limit resonant voltage changes ( ⁇ Vce-lim) prerecorded in its memory for different power scales selected via the user interface (10).
  • the control unit (11) decides that the vessel (K) is slid outside the efficient heating zone (B), interrupts the coil current (I L ) and stops the operation of the induction heating cooktop (1).
  • the control unit (11) keeps the coil current (I L ) constant and hence the power transferred to the vessel (K) in variable mains voltage and temperature conditions by means of the current monitoring circuit (12) and the drive circuit (9). Even if slid a little off the level of the induction coil (4), the vessel (K) is enabled to be heated inside the efficient heating zone (B) in accordance with the heating setting selected via the user interface (10).
  • control unit (11) compares the constant coil current (I L-SB ) values prerecorded in its memory and corresponding to the heating setting selected via the user interface (10) with the actual coil current (I L ) values monitored by means of the current monitoring circuit (12), intervenes in the power switch (7) by means of the drive circuit (9) and enables the actual coil current (I L ) to be equalized with the constant coil current (I L-SB ), thus enables the power transferred from the induction coil (4) to the vessel (K) to be kept constant.
  • I L-SB constant coil current
  • the current monitoring circuit (12) comprises a current detection resistor (14) that is connected in series to the induction coil (4) and that converts the coil current (I L ) into voltage data ( Figure 3).
  • the control unit (11) receives the voltage data relating to the coil current (I L ) from the terminals of the current detection resistor (14).
  • the current monitoring circuit (12) comprises a current transformer (15) connected in series to the induction coil (4) and decreasing the coil current (I L ) to a level that can be detected by the control unit (11) and the current detection resistor (14) connected in parallel to the secondary side of the current transformer (15) ( Figure 2).
  • the voltage monitoring circuit (13) comprises a voltage divider (16) that has resistors (R1, R2) connected in series to the collector node (8) and that applies an easy-to-monitor, low level resonant voltage (Vce) to the control unit (11) by dividing the resonant voltage (Vce) ( Figure 2, Figure 3).
  • the induction heating cooktop (1) of the present invention constant power is transferred to the vessel (K) in the efficient heating zone (B) wherein the vessel (K) is allowed to be slid a little off the induction coil (4) level and the vessel (K) being slid causes change in the resonant voltage (Vce).
  • the coil current (I L ) is kept constant and the resonant voltage ( ⁇ Vce) that changes as the vessel (K) is slid off over the induction coil (4) is monitored.
  • the control unit (11) keeps the coil current (I L ) constant and detects whether or not the vessel (K) is present or the alignment of the vessel (K) on the induction coil (4) is appropriate by monitoring the resonant voltage changes ( ⁇ Vce) caused by the vessel (K) being slid.
  • the power switch (7) and the other electronic circuit components are prevented from being damaged.
  • the position of the vessel (K) placed on the induction coil (4) is detected precisely under variable mains input voltage and temperature conditions, and the vessel (K) is provided to be heated with a constant power.

Landscapes

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

Abstract

La présente invention concerne une table de caisson à induction (1) comprenant un circuit résonant (6) comportant une bobine d'induction (4) et un condensateur résonant (5) connecté en parallèle à la bobine d'induction (4), un commutateur d'alimentation (7), par exemple un IGBT, qui commande le circuit résonant (6), un noeud de collecteur (8) sur lequel une tension de résonance (Vce) pendant les temps de non conduction (fermeture) du commutateur d'alimentation (7), un circuit de commande (9) qui assure la commande du commutateur d'alimentation (7), et une unité de contrôle (11) qui régule le fonctionnement du commutateur d'alimentation (7) en contrôlant le circuit de commande (9), la présence d'une casserole (K) placée sur la bobine d'induction (4) et son positionnement approprié étant déterminés dans différents réglages de chauffage et dans des conditions de tension alternative secteur et de température variables.
PCT/EP2013/076220 2012-12-12 2013-12-11 Table de cuisson à induction Ceased WO2014090872A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13821078.6A EP2939500B1 (fr) 2012-12-12 2013-12-11 Table de cuisson à induction
CN201380065442.8A CN105165116A (zh) 2012-12-12 2013-12-11 一种感应加热炉灶

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRA2012/14557 2012-12-12
TR201214557 2012-12-12

Publications (1)

Publication Number Publication Date
WO2014090872A1 true WO2014090872A1 (fr) 2014-06-19

Family

ID=49956129

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/076220 Ceased WO2014090872A1 (fr) 2012-12-12 2013-12-11 Table de cuisson à induction

Country Status (3)

Country Link
EP (1) EP2939500B1 (fr)
CN (1) CN105165116A (fr)
WO (1) WO2014090872A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323010A (zh) * 2016-11-15 2017-01-11 天津林立感应加热电炉制造有限公司 大直径可吊装感应加热炉圈
CN110398676B (zh) * 2018-04-23 2022-03-15 佛山市顺德区美的电热电器制造有限公司 烹饪设备上锅具的移动状态检测方法、装置及烹饪设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889090A (en) * 1973-06-15 1975-06-10 Westinghouse Electric Corp Induction heat cooking apparatus
GB2062985A (en) * 1979-11-12 1981-05-28 Matsushita Electric Industrial Co Ltd Small load detection by comparison between input and output parameters of an induction heat cooking apparatus
US5424514A (en) * 1993-08-10 1995-06-13 Goldstar Electron Co., Ltd. Apparatus for sensing small object in high-frequency induction heating cooker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889090A (en) * 1973-06-15 1975-06-10 Westinghouse Electric Corp Induction heat cooking apparatus
GB2062985A (en) * 1979-11-12 1981-05-28 Matsushita Electric Industrial Co Ltd Small load detection by comparison between input and output parameters of an induction heat cooking apparatus
US5424514A (en) * 1993-08-10 1995-06-13 Goldstar Electron Co., Ltd. Apparatus for sensing small object in high-frequency induction heating cooker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices
US12245348B2 (en) 2018-04-23 2025-03-04 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices

Also Published As

Publication number Publication date
EP2939500A1 (fr) 2015-11-04
EP2939500B1 (fr) 2017-01-11
CN105165116A (zh) 2015-12-16

Similar Documents

Publication Publication Date Title
EP2932794B1 (fr) Surface de cuisson à chauffage par induction
JP6021933B2 (ja) 誘導加熱調理器
EP3170363B1 (fr) Système et procédé d'amélioration de performance de bruit de dispositif de chauffage par induction d'onduleur quasi-résonant multi-zone
EP3042541B1 (fr) Dispositif de chauffage à induction comprenant un circuit de détection de position d'ustensile de cuisine
US9066373B2 (en) Control method for an induction cooking appliance
EP2932793B1 (fr) Surface de cuisson à chauffage par induction
JPWO2015063942A1 (ja) 誘導加熱調理器
JPWO2014069011A1 (ja) 誘導加熱調理器
EP2939500B1 (fr) Table de cuisson à induction
EP2939499B1 (fr) Table de cuisson à chauffage par induction
JP2011034712A (ja) 誘導加熱調理器
EP3424269B1 (fr) Circuit de commande de puissance de cuisinière à induction
JP6211175B2 (ja) 誘導加熱調理器
KR102261568B1 (ko) 피가열체를 감지하는 가열 장치
EP3170362B1 (fr) Système et procédé permettant la modification de positionnement de batterie de cuisine dans une cuisinière à chauffage par induction
EP3170364A1 (fr) Plaque de cuisson par induction permettant une commande de réglage de puissance améliorée
JP5542506B2 (ja) 誘導加熱調理器
KR20220127472A (ko) 유도가열 조리기의 유도가열 회로
KR20210081053A (ko) 전자 유도 가열 조리기기 및 그의 구동 모듈
EP3432683B1 (fr) Appareil de cuisson à induction, procédé de fonctionnement et programme informatique
WO2017149055A1 (fr) Circuit de commande de puissance de cuisinière à induction

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201380065442.8

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13821078

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2013821078

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2013821078

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE