EP2774452A1 - Cuiseur à induction - Google Patents

Cuiseur à induction

Info

Publication number
EP2774452A1
EP2774452A1 EP12769110.3A EP12769110A EP2774452A1 EP 2774452 A1 EP2774452 A1 EP 2774452A1 EP 12769110 A EP12769110 A EP 12769110A EP 2774452 A1 EP2774452 A1 EP 2774452A1
Authority
EP
European Patent Office
Prior art keywords
vessel
voltage
induction coil
power switch
square wave
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.)
Withdrawn
Application number
EP12769110.3A
Other languages
German (de)
English (en)
Inventor
Namik Yilmaz
Metin OZTURK
Hakan Suleyman YARDIBI
Ibrahim Niyazi Ulgur
Burcak Aytekin
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 EP2774452A1 publication Critical patent/EP2774452A1/fr
Withdrawn legal-status Critical Current

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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present invention relates to an induction heating cooker comprising electronic elements that carry high current.
  • the induction heating cooker functions according to the principle of heating a cast iron or steel ferromagnetic cooking container with the magnetic field effect generated by the induction coil.
  • the power switch IGBT-Insulated Gate Bipolar Transistor, diode or Mosfet
  • the half bridge series resonant (HBSR) circuits realized by using two power switches and two resonant capacitors, and the single switch quasi resonant (SSQR) circuits realized by one power switch and one resonant capacitor are used for driving a single induction coil.
  • the single switch quasi resonant circuits are preferred due to cost advantage however they function in narrower energy frequency range and can deliver power to the cooking container only within a certain voltage and power range.
  • vessel detection process is realized in order to determine the initial conditions and it is detected if there is a vessel on the induction coil and when a vessel is present if the ferromagnetic features and dimensions thereof are appropriate. If this detection process is not carried out properly, energy is transmitted to the induction coil when no vessel is present thereon or when there is a vessel without appropriate ferromagnetic features, thus the electronic components shortcircuit due to high currents.
  • the mains input voltage is irregular, for example the mains input voltage oscillates between 100 and 300 volts, detection and analysis of the cooking container pose a serious problem in the said quasi resonant structure. Vessel detection process is not carried out properly due to the changing mains input voltage and the power switch is damaged due to high currents.
  • the European Patent Application No. EP2282606 relates to an induction device control method.
  • the presence of the vessel on the induction coil, the resistivity and the dimensions thereof are detected by comparing the resonant voltage with a predetermined fixed reference voltage in the control unit.
  • the aim of the present invention is the realization of an induction heating cooker wherein the vessel placed onto the induction coil is properly detected in variable mains input voltage conditions.
  • the induction heating cooker 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 to direct current, a quasi resonant circuit having an induction coil and a resonant capacitor, a power switch, for example an IGBT, that drives the quasi resonant circuit, a collector node whereon the resonant voltage is generated, a drive circuit that provides the power switch to be driven and a comparator that compares the DC-line voltage at the output of the bridge rectifier with the resonant voltage at the collector node.
  • a bridge rectifier that converts the alternative mains current to direct current
  • a quasi resonant circuit having an induction coil and a resonant capacitor
  • a power switch for example an IGBT
  • a collector node whereon the resonant voltage is generated
  • a drive circuit that provides the power switch to be driven
  • a comparator that compares the DC-line voltage at the output of
  • the control unit By evaluating the signals at the output of the comparator, the control unit detects if a vessel is present on the induction coil, and when a vessel is present, detects if the ferromagnetic features and dimensions thereof are appropriate, moreover if the vessel is properly aligned on the induction coil.
  • the induction heating cooker comprises a first voltage divider disposed between the quasi resonant circuit and the ground, having resistors connected in series, connected in parallel to the power switch and a second voltage divider disposed between the DC line and the ground, having resistors connected in series.
  • the comparator compares the low-level reference resonant voltage generating at the connection node between the resistors in the first voltage divider with the low-level reference DC voltage generating at the connection nodes between the resistors in the second voltage divider.
  • the control unit decides that a vessel with appropriate ferromagnetic features is placed on the induction coil, if a single square wave signal is observed at the output of the comparator or if there is no square wave signal.
  • the control unit decides that no vessel is present on the induction coil, if a high number of successive square wave signals is observed at the output of the comparator.
  • the control unit decides that the diameter of the vessel is smaller than what is allowed or the vessel is not ferromagnetic, if a smaller number of square wave signals compared to the situation where no vessel is present, is observed at the output of the comparator.
  • control unit furthermore, compares the period of the square wave signal at the output of the comparator with limit values prerecorded in its memory and decides if the vessel is properly aligned on the induction coil.
  • the control unit updates the non-conducting time where the power switch is in the open position according to the period of the square wave signal, if the period of the square wave signal changes on the condition that it remains between the limit values.
  • the induction heating cooker in the unfavorable conditions where the AC mains input voltage is variable, the presence of vessel on the induction coil, the ferromagnetic features of the vessel and the alignment state thereof on the induction coil are detected in a secure manner, and initial conditions suitable for the characteristics of the vessel are applied while the initial energy is delivered when the heating process is started.
  • Figure 1 – is the schematic view of an induction heating cooker.
  • Figure 2 – is the graph showing the change of the resonant voltage at the collector node and the square wave signals at the output of the comparator, with respect to time, when the drive voltage is applied to the power switch of an induction heating cooker.
  • the induction heating cooker (1) comprises a filtering circuit (2) that filters the AC mains voltage, a bridge rectifier (3) that converts the alternative current received from the mains to direct current, a DC-line inductor (4) and a DC-line capacitor (5) disposed at the output of the bridge rectifier (3) and which deliver DC voltage in a certain frequency range by filtering the voltage generated in the DC-line, a parallel resonant circuit (8) having an induction coil (6) that provides the vessel (K) placed thereon to be heated and a resonant capacitor (7) connected in parallel to the induction coil (6), a power switch (9), for example an IGBT (Insulated Gate Bipolar Transistor), that drives the parallel resonant circuit (8), that changes to the conducting state in the closed position and that provides the resonant capacitor (7) to be charged during the conducting time (Ton), that stops conducting in the open position and that provides the resonant capacitor (7) to be discharged during the non-conducting time (Toff), also providing the delivery of the
  • the conducting time (Ton) where the power switch (9) is in the closed position is determined by power level adjustment performed by the user.
  • the non-conducting time (Toff) where the power switch (9) is in the open position is determined by the control unit (13) according to the characteristic features of the vessel (K) placed on the induction coil (6), alignment of the vessel (K) on the induction coil (6), AC mains voltage conditions and the temperature of the vessel (K).
  • the resonant capacitor (7) is first charged then discharged, the resonant voltage (Vce) is generated at the collector node (10) and energy is delivered to the vessel (K) from the induction coil (6).
  • the power switch (9) At the lowermost level of the resonant voltage (Vce), the power switch (9) is changed from the open position to the closed position, in other words from the non-conducting state to the conducting state and energy is stored in the induction coil (6) during the conducting time (Ton) of the power switch (9).
  • the induction heating cooker (1) of the present invention comprises a comparator (14) that compares the DC line voltage (Vdc) at the output of the bridge rectifier (3) with the resonant voltage (Vce) generating at the collector node (10) and the control unit (13) that evaluates the signals (S) at the output of the comparator (14) and detects if the vessel (K) is present on the induction coil (6) and when the vessel (K) is present, if the characteristic features, for example ferromagnetic features and dimensions thereof and its alignment on the induction coil (6) are appropriate ( Figure 1).
  • the control unit (13) applies a short term drive voltage (Vge) (input signal or “pulse”), for example in a value of 15V to the power switch (9) through the drive circuit (12) in order to detect the vessel (K), the power switch (9) is changed to the closed position and then back to the open position, the resonant capacitor (7) is discharged during the non-conducting time (Toff) where the power switch (9) is in the open position and the resonant voltage (Vce) is generated at the collector node (10).
  • Vge drive voltage
  • Vce output signal or “pulse”
  • the comparator (14) compares the collector node (10) voltage (Vce) with the DC line voltage (Vdc) and generates square wave signals (S) with variable number or period according to the difference between the two voltage values (Vdc, Vce).
  • the control unit (13) detects if a vessel (K) is present on the induction coil (6), and when a vessel (K) is present, detects if the ferromagnetic features and dimensions thereof are appropriate, if the vessel (K) is properly aligned on the induction coil (6).
  • the control unit (13) adjusts the non-conducting time (Toff) of the power switch (9) according to the result of the vessel (K) detection.
  • the conducting time (Ton) of the power switch (9) is determined by power level adjustment performed by the user.
  • the AC mains voltage is variable, for example the AC mains voltage varies between 100 volts and 300 volts
  • the DC line voltage (Vdc) changes in synchronization with the AC mains voltage
  • the resonant voltage (Vce) and the variable DC line voltage (Vdc) are compared ( Figure 2).
  • a secure comparison is realized and the erroneous detection of the vessel (K) is prevented. For example, in low mains input voltage conditions, it is prevented that the vessel (K) is detected as non-present although the vessel (K) is present on the induction coil (6).
  • the induction heating cooker (1) comprises a first voltage divider (15) disposed between the parallel resonant circuit (8) and the ground (GND), having resistors (R1, R2) connected in series, connected in parallel to the power switch (9) and applying an easily-measurable low level reference resonant voltage (Vce-ref) to the comparator (14) by dividing the resonant voltage (Vce) at the collector node (10) and a second voltage divider (16) disposed between the DC line and ground (GND), having resistors (R3, R4) connected in series and applying an easily-measurable low level reference DC voltage (Vdc-ref) to the comparator (14) by dividing the DC voltage (Vdc) ( Figure 1).
  • the comparator (14) compares the reference resonant voltage (Vce-ref) generating at the connection node (N1) between the resistors (R1, R2) in the first voltage divider (15) with the reference DC voltage (Vdc-ref) generating at the connection node (N2) between the resistors (R3, R4) in the second voltage divider (16) ( Figure 1).
  • the control unit (13) decides that a vessel (K) with appropriate characteristic features is present on the induction coil (6) if a single square wave signal (S) is observed at the output of the comparator (14) or if no square wave signal is observed. No square wave signal (S) is generated at the output of the comparator (14) even if a vessel (K) is placed on the induction coil (6), the number of the drive voltage (Vge) is increased until a square wave signal (S) generation is observed.
  • the control unit (13) determines the non-conducting time (Toff) where the power switch (9) is in the open position, according to the period (Ts) of the square wave signal (S) at the output of the comparator (14).
  • the control unit (13) decides that the resonant voltage (Vce) is higher than the DC voltage (Vdc) since the resonant voltage (Vce) encounters any resistance generated by the vessel (K), and decides that no vessel (K) is present on the induction coil (6).
  • the control unit (13) decides that the diameter of the vessel (K) is smaller than what is allowed or that the vessel (K) is not of ferromagnetic characteristic.
  • control unit (13) compares the period (Ts) of the square wave signal (S) at the output of the comparator (14) with a lower limit (Ts-min) and a upper limit (Ts-max) prerecorded in its memory and, if the period (Ts) of the square wave signal (S) is between the lower limit (Ts-min) and the upper limit (Ts-max) (Ts-min ⁇ Ts ⁇ Ts-max), decides that the vessel (K) is properly aligned on the induction coil (6) ( Figure 2).
  • the control unit (13) decides that the vessel (K) is not properly aligned on the induction coil (6), in other words the vessel (K) is “slid” or “lifted” from over the induction coil (6) more than the desired amount.
  • the control unit (13) updates the non-conducting time (Toff) where the power switch (9) is in the open position according to the period (Ts) of the square wave signal (S), if the period (Ts) of the square wave signal (S) changes on the condition that it remains between the limit values (Ts-min, Ts-max).
  • the period (Ts) of the square wave signal (S) at the output of the comparator (14) changes according to the new position of the vessel (K) and the non-conducting time (Toff) of the power switch (9) is updated depending on the period (Ts) of the square wave signal (S) at the output of the comparator (14),
  • the vessel (K) placed on the induction coil (6) is detected, and it is controlled in a secured manner if the vessel (K) is present, if the vessel (K) is of ferromagnetic characteristics or if the vessel (K) is properly aligned on the induction coil (6).

Landscapes

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

Abstract

La présente invention vise un cuiseur à induction (1) comprenant un redresseur en pont (3) qui convertit le courant alternatif en courant continu, un inducteur de ligne C.C. (4) et un condensateur de ligne C.C. (5) disposés à la sortie du redresseur en pont (3), un circuit résonant parallèle (8) doté d'une bobine d'induction (6) qui permet au récipient (K) placé sur celle-ci d'être chauffé par le champ magnétique qu'elle génère et un condensateur résonant (7) relié en parallèle à la bobine d'induction (6), un commutateur d'alimentation (9) qui actionne le circuit résonant parallèle (8), un nœud collecteur (10) sur lequel la tension résonante (Vce) est générée à la position ouverte du commutateur d'alimentation (9) pendant le temps de non conduction (Toff), une unité de commande (13) qui régule le fonctionnement du commutateur d'alimentation (9) et un circuit d'attaque (12) qui fournit la tension d'attaque (Vge) au commutateur d'alimentation (9) à actionner, la présence du récipient (K) sur la bobine d'induction (6) et ses caractéristiques étant détectées en cas de conditions variables dans la tension du courant alternatif secteur.
EP12769110.3A 2011-11-03 2012-10-08 Cuiseur à induction Withdrawn EP2774452A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201110995 2011-11-03
PCT/EP2012/069850 WO2013064331A1 (fr) 2011-11-03 2012-10-08 Cuiseur à induction

Publications (1)

Publication Number Publication Date
EP2774452A1 true EP2774452A1 (fr) 2014-09-10

Family

ID=46980970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12769110.3A Withdrawn EP2774452A1 (fr) 2011-11-03 2012-10-08 Cuiseur à induction

Country Status (2)

Country Link
EP (1) EP2774452A1 (fr)
WO (1) WO2013064331A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107027204A (zh) * 2016-02-02 2017-08-08 佛山市顺德区美的电热电器制造有限公司 电磁加热装置及其加热控制电路和低功率加热控制方法
CN107027206A (zh) * 2016-02-02 2017-08-08 佛山市顺德区美的电热电器制造有限公司 电磁加热装置及其加热控制电路和低功率加热控制方法
CN107155229A (zh) * 2016-03-03 2017-09-12 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪装置及其加热控制电路和控制方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2999302B1 (fr) * 2014-09-18 2019-11-27 Electrolux Appliances Aktiebolag Plaque de cuisson à induction et procédé pour détecter la présence d'une batterie de cuisine
CN107027202B (zh) * 2016-02-02 2021-04-20 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪装置及其加热控制电路和加热控制方法
CN108631617B (zh) * 2017-03-20 2020-06-16 万国半导体(开曼)股份有限公司 用于开关电源器件的硬开关禁用
EP3582586B1 (fr) * 2018-06-16 2020-12-23 Electrolux Appliances Aktiebolag Procédé pour commander une zone de cuisson d'une table de cuisson par induction
EP3598849B1 (fr) * 2018-07-18 2022-05-04 LG Electronics Inc. Procédé de détection de récipient à l'aide d'un courant résonant
EP3598850B1 (fr) * 2018-07-18 2020-12-16 LG Electronics Inc. -1- Dispositif de chauffage par induction pour effectuer une fonction de détection de récipients
KR102641089B1 (ko) * 2018-11-08 2024-02-26 엘지전자 주식회사 용기 감지 정확도 개선을 위한 단일 펄스 예비 테스트 방법

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Publication number Priority date Publication date Assignee Title
US4467165A (en) * 1979-09-17 1984-08-21 Matsushita Electric Industrial Co., Ltd. Induction heating apparatus
DE102005050036A1 (de) * 2005-10-14 2007-05-31 E.G.O. Elektro-Gerätebau GmbH Induktionsheizeinrichtung und zugehöriges Betriebs- und Topferkennungsverfahren
ATE554632T1 (de) 2009-08-05 2012-05-15 Coprecitec Sl Steuerungsverfahren für eine induktionsvorrichtung und induktionsvorrichtung

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107027204A (zh) * 2016-02-02 2017-08-08 佛山市顺德区美的电热电器制造有限公司 电磁加热装置及其加热控制电路和低功率加热控制方法
CN107027206A (zh) * 2016-02-02 2017-08-08 佛山市顺德区美的电热电器制造有限公司 电磁加热装置及其加热控制电路和低功率加热控制方法
CN107027206B (zh) * 2016-02-02 2023-04-07 佛山市顺德区美的电热电器制造有限公司 电磁加热装置及其加热控制电路和低功率加热控制方法
CN107027204B (zh) * 2016-02-02 2023-04-07 佛山市顺德区美的电热电器制造有限公司 电磁加热装置及其加热控制电路和低功率加热控制方法
CN107155229A (zh) * 2016-03-03 2017-09-12 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪装置及其加热控制电路和控制方法
CN107155229B (zh) * 2016-03-03 2023-04-07 佛山市顺德区美的电热电器制造有限公司 电磁加热烹饪装置及其加热控制电路和控制方法

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