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WO2014090868A1 - Table de cuisson à chauffage par induction - Google Patents

Table de cuisson à chauffage par induction Download PDF

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Publication number
WO2014090868A1
WO2014090868A1 PCT/EP2013/076210 EP2013076210W WO2014090868A1 WO 2014090868 A1 WO2014090868 A1 WO 2014090868A1 EP 2013076210 W EP2013076210 W EP 2013076210W WO 2014090868 A1 WO2014090868 A1 WO 2014090868A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
power switch
induction coil
switch
vessel
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/EP2013/076210
Other languages
English (en)
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
Priority to CN201380065020.0A priority Critical patent/CN105230120B/zh
Priority to EP13818200.1A priority patent/EP2939499B1/fr
Publication of WO2014090868A1 publication Critical patent/WO2014090868A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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 cast iron or steel ferromagnetic cookware, for example a pot, with the magnetic field effect generated by the induction coil.
  • a cast iron or steel ferromagnetic cookware for example a pot
  • high amount of electric current is passed through the power switch (IGBT-Insulated Gate Bipolar Transistor, diode or MOSFET) on the circuit board.
  • IGBT-Insulated Gate Bipolar Transistor, diode or MOSFET the power switch
  • HBSR half bridge series resonant
  • 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 alternating 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 freewheeling diode connected in parallel to the power switch and providing continuity of the induction coil current during the non-conduction times of the power switch, a collector node whereon resonance voltage is generated, and a current detection circuit that is connected in series to the power switch and the freewheeling diode and that provides the switch current, passing through the power switch and the freewheeling diode, to be monitored by converting it into voltage data.
  • a bridge rectifier that converts the alternating mains current into direct current
  • a resonant circuit having an induction coil and a resonant capacitor
  • a power switch for example an IGBT
  • the current detection circuit is formed of a current detection resistor connected in series to the power switch and the freewheeling diode or formed of a current transformer connected in series to the freewheeling diode and a current detection 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 diode conduction time wherein the switch current, detected by the current detection circuit and converted into voltage data, passes through the freewheeling diode with a threshold diode conduction time recorded in its memory.
  • a comparator connected in parallel to the terminals of the current detection resistor generates square wave output signals with periods equal to the diode conduction times by detecting the times of the switch current passes through the freewheeling diode and the power switch.
  • 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 periods, that are equal to the diode conduction times, of the output signals of the comparator are greater than the threshold output signal periods 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 switch current passing through the power switch and the freewheeling diode and change in 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 comparator 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 inductor and a DC-line capacitor and delivering 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 time and that provides the energy to be delivered
  • the conduction times wherein the power switch (7) is in the 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 is 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 non-conduction 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 state to the 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) connected in series to the power switch (7) and the freewheeling diode (8), that converts the switch current (Is) passing through the power switch (7) and the freewheeling diode (8) into voltage data in the non-conduction times wherein the power switch (7) is in the turned-on position and power is transferred from the induction coil (4) to the vessel (K) and thus provides the monitoring of the switch current (Is), and further comprises the control unit (11) that calculates the diode conduction time (Td) of the switch current (Is) passing through the freewheeling diode (8) by monitoring the switch current (Is) converted into voltage data and received from the current detection circuit (12) and that compares the diode conduction time (Td) with a threshold diode conduction time (Td-threshold) recorded in its memory, thus determining whether or not the vessel (K) is present on the induction coil (4) or whether alignment of the vessel (K) on the in
  • the control unit (11) detects the switch current (Is) passing through the power switch (7) and the freewheeling diode (8) as converted into voltage data by means of the current detection circuit (12) and calculates the diode conduction time (Td) wherein the switch current (Is) passes through the freewheeling diode (8) in the non-conduction times of the power switch (7) by monitoring the switch current (Is). According to the diode conduction time (Td), the control unit (11) determines whether or not the vessel (K) is present on the induction coil (4) and if the vessel (K) is present on the induction coil (4) determines whether the vessel (K) is in the appropriate position, in other words whether the vessel (K) is aligned with the induction coil (4).
  • the diode conduction time (Td) is dependent on the discharging time of the resonant capacitor (5).
  • the discharging time of the resonant capacitor (5) changes depending on the position of the vessel (K) placed on the induction coil (4). For example, resistance on the induction coil (4) decreases as the vessel (K) is moved from its aligned position on the induction coil (4) and the resonant capacitor (5) short-circuits by discharging rapidly.
  • the rapid discharging of the resonant capacitor (5) increases the diode conduction time (Td) and the control unit (11) decides that the vessel (K) is not present on the induction coil (4) (the vessel (K) is lifted) or that the vessel (K) is not aligned with the induction coil (4) (the vessel (K) is slid more than permitted) 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 power switch (7) and the freewheeling diode (8) and that converts the switch current (Is) into voltage data ( Figure 1).
  • the control unit (11) receives the voltage data defining the switch current (Is) from the terminals of the current detection resistor (13).
  • the current detection circuit (12) comprises a current transformer (14) connected in series to the power switch (7) and the freewheeling diode (8) and decreasing the switch current (Is) to a level that can be detected by the control unit (11) and furthermore comprises the current detection resistor (13) connected in parallel to the secondary side of the current transformer (14) ( Figure 2).
  • the induction cooking cooktop (1) comprises a comparator (15) that is connected in parallel to the current detection resistor (13), that generates square wave output signals (S1) by detecting the times (Td) the switch current (Is) passes through the freewheeling diode (8) and the power switch (7), and thus that provides easy monitoring of the switch current (Is).
  • the comparator In the non-conduction (turned-on) times of the power switch (7) when the induction coil (4) transfers energy to the vessel (K), the comparator (15) generates square wave output signals (S1) with a low supply voltage (Vcc) amplitude such as 5V and with periods of the times between the points where the switch current (Is) passes through the freewheeling diode (8) being equal to the diode conduction times (Td) ( Figure 3).
  • 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 output signal (S1) time (Td) of the comparator (15) is greater than the threshold signal time (Td-threshold) (Td>Td-threshold) recorded in its memory and interrupts the current of the induction coil (4).
  • 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 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)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)

Abstract

La présente invention se rapporte à une table de cuisson à chauffage par induction (1) qui comprend un circuit résonnant (6) qui comporte une bobine d'induction (4) et un condensateur résonnant (5) raccordé en parallèle à la bobine d'induction (4), un commutateur de puissance (7), par exemple un transistor bipolaire à porte isolée, qui commande le circuit résonnant (6), une diode libre (8) raccordée en parallèle au commutateur de puissance (7), un nœud collecteur (9) sur lequel une tension de résonance (Vce) est générée pendant les moments de non-conduction (d'ouverture) du commutateur de puissance (7), un circuit d'attaque (10) qui permet que le commutateur de puissance (7) soit commandé, et une unité de commande (11) qui régule le fonctionnement du commutateur de puissance (7) en commandant le circuit d'attaque (10), la présence du récipient (K) placé sur la bobine d'induction (4) et une position appropriée de ce dernier étant déterminées dans des conditions de température et de tension de secteur variables.
PCT/EP2013/076210 2012-12-11 2013-12-11 Table de cuisson à chauffage par induction Ceased WO2014090868A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201380065020.0A CN105230120B (zh) 2012-12-11 2013-12-11 感应加热炉灶面
EP13818200.1A EP2939499B1 (fr) 2012-12-11 2013-12-11 Table de cuisson à chauffage par induction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRA2012/14456 2012-12-11
TR201214456 2012-12-11

Publications (1)

Publication Number Publication Date
WO2014090868A1 true WO2014090868A1 (fr) 2014-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/076210 Ceased WO2014090868A1 (fr) 2012-12-11 2013-12-11 Table de cuisson à chauffage par induction

Country Status (3)

Country Link
EP (1) EP2939499B1 (fr)
CN (1) CN105230120B (fr)
WO (1) WO2014090868A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102373839B1 (ko) 2017-11-23 2022-03-14 삼성전자주식회사 조리 장치 및 그 제어방법
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices

Citations (2)

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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101010989B (zh) * 2005-06-02 2011-05-11 松下电器产业株式会社 感应加热装置
JP5225465B2 (ja) * 2009-05-26 2013-07-03 三菱電機株式会社 誘導加熱調理器および誘導加熱方法
JP2011023163A (ja) * 2009-07-14 2011-02-03 Panasonic Corp 炊飯器

Patent Citations (2)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US11153938B2 (en) 2017-06-26 2021-10-19 Lg Electronics Inc. Cooking vessel sensor and induction heating device including a cooking vessel sensor
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
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

Also Published As

Publication number Publication date
EP2939499B1 (fr) 2016-12-07
EP2939499A1 (fr) 2015-11-04
CN105230120B (zh) 2017-05-03
CN105230120A (zh) 2016-01-06

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