EP2774259B1 - Cuiseur à induction - Google Patents

Cuiseur à induction Download PDF

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Publication number
EP2774259B1
EP2774259B1 EP12769109.5A EP12769109A EP2774259B1 EP 2774259 B1 EP2774259 B1 EP 2774259B1 EP 12769109 A EP12769109 A EP 12769109A EP 2774259 B1 EP2774259 B1 EP 2774259B1
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EP
European Patent Office
Prior art keywords
capacitor
voltage
circuit
power switch
induction heating
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.)
Active
Application number
EP12769109.5A
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German (de)
English (en)
Other versions
EP2774259A1 (fr
Inventor
Namik Yilmaz
Metin OZTURK
Hakan Suleyman YARDIBI
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
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Publication date
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Publication of EP2774259A1 publication Critical patent/EP2774259A1/fr
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Publication of EP2774259B1 publication Critical patent/EP2774259B1/fr
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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

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 (SSQR) circuits are preferred due to cost advantage however they function in narrower energy frequency range as compared with two-power-switch structure and the maximum power obtained is limited.
  • the power switch draws high amplitude capacitor charge currents and the said high currents cause the power switch to be damaged and shorten the life span of the induction heating cooker. Therefore, the destructive peak currents passing through the power switch are required to be detected and the peak currents are prevented from being generated by adjusting the time the power switch remains closed during which it conducts the current and the time it remains open during which it cuts off the current.
  • current detection resistors connected in series to the power switch are used for detecting the current on the power switch. Additional components are needed for bringing the voltage measured on the current detection resistors connected in series to the power switch to a level so as to be processed by the control unit and thus the cost of the circuit board increases.
  • the aim of the present invention is the realization of an induction heating cooker wherein the electric current passing through the power switch is detected.
  • 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 DC-line inductor and a DC-line capacitor disposed at the output of the bridge rectifier and which deliver DC voltage in a certain frequency range by filtering the voltage generated in the DC-line, a parallel resonant circuit having an induction coil and a resonant capacitor, a power switch having an IGBT and a freewheel diode connected in parallel to the IGBT, which changes to the conducting state in the closed position and provides the resonant capacitor to be charged, providing the delivery of the energy stored in the resonant capacitor to the vessel by means of the induction coil in the open position, a control unit which regulates the operation of the power switch, and a voltage change detection circuit connected in parallel to the DC-line capacitor and which detects the voltage changes on the DC-line capacitor.
  • the control unit detects the current that passes through the freewheel dio
  • the voltage change detection circuit comprises a voltage divider circuit which reduces the DC-line voltage to an easily-detectable level and a derivation circuit which is connected in series to the voltage divider circuit and calculates the change of the voltage with respect to time (dv/dt).
  • the voltage divider circuit comprises three resistors connected in series, that do not require special design and two capacitors connected in parallel to the resistors.
  • the derivation circuit comprises a resistor and a capacitor connected in series.
  • a voltage change detection circuit which detects the voltage changes on the DC-line capacitor is used instead of high cost current detectors such as current transformers or shunt resistors and thus the currents passing through the power switch can be detected.
  • the voltage change detection circuit consists of low cost standard resistance and capacitance elements.
  • Figure 1 - is the schematic view 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 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) having an IGBT (Insulated Gate Bipolar Transistor) and a freewheel diode (D) connected in parallel to the IGBT, which changes to the conducting state in the closed position and provides the resonant capacitor (7) to be charged, providing the delivery of the energy stored in the resonant capacitor (7) to the vessel (K) by means of the induction coil (6) in the open position, a collector node (10) disposed between
  • the induction heating cooker (1) of the present invention comprises a voltage change detection circuit (14) connected in parallel to the DC-line capacitor (5) and which detects the voltage changes on the DC-line capacitor (5) and the control unit (13) which detects the value of the current that passes through the IGBT and the freewheel diode (D) in the open and closed positions of the power switch (9) according to the signals received from the voltage change detection circuit (14).
  • the currents that pass through the power switch (9) also pass through the DC-line capacitor (5) and complete their cycles.
  • the current that passes through the power switch (9) passes through the DC-line capacitor (5) under all circumstances.
  • the voltage change detection circuit (14) detects the voltage changes on the DC-line capacitor (5), and the control unit (13) evaluates the data received from the voltage change detection circuit (14) and detects the value of the current that passes through the DC-line capacitor (5) and hence (since the current of same value passes therethrough) the current that passes through the power switch (9).
  • the DC-line capacitor (5) is used as "current detector".
  • the voltage change detection circuit (14) consists of standard electronic components that do not require special design and cost advantage is provided.
  • the voltage change detection circuit (14) comprises a voltage divider circuit (15) which divides and reduces the DC-line voltage to an easily-detectable level, for example from 300 volt to 5 volt and a derivation circuit (16) which is connected in series to the voltage divider circuit (15) and which transmits the information of voltage differentiation on the DC-line capacitor (5) to the control unit (13).
  • the voltage divider circuit (15) comprises three resistors (R1, R2, R3) connected in series, a first capacitor (C1) connected in parallel to the first and second resistors (R1, R2), between the input node of the first resistor (R1) and the output node of the second resistor (R2) and a second capacitor (C2) connected in parallel to the second and third resistors (R2, R3), between the input node of the second resistor (R2) and the output note of the third resistor (R3).
  • the derivation circuit (16) comprises a third capacitor (C3) connected in series to the resistors (R1, R2, R3) in the voltage divider circuit (15) and a fourth resistor (R4) which is connected between the output node of the third capacitor (C3) and the ground (GND).
  • the DC-line capacitor (5) is also used as a current detector besides its own function and the voltage changes on the DC-line capacitor (5) are easily detected by the voltage change detection circuit (14).
  • the voltage change detection circuit (14) consists of standard resistance and capacitance elements that do not require special design and cost advantage is provided.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (4)

  1. Cuisinière à chauffage par induction (1) comprenant un redresseur en pont (3) qui convertit le courant alternatif en courant continu, un inducteur de ligne CC (4) et un condensateur de ligne CC (5) disposés à la sortie du redresseur en pont (3), un circuit résonant parallèle (8) ayant une bobine d'induction (6) et un condensateur résonant (7), et un interrupteur d'alimentation (9) ayant une IGBT et une diode de roue libre (D) connectées en parallèle à l'IGBT, qui passe à l'état conducteur dans la position fermée et fournit le condensateur résonant (7) à charger, fournissant la fourniture de l'énergie stockée dans le condensateur résonant (7) au récipient (K) au moyen de la bobine d'induction (6) en position ouverte et une unité de commande (13) qui régule le fonctionnement de l'interrupteur d'alimentation (9), caractérisée par un circuit de détection de changement de tension (14) connecté en parallèle au condensateur de ligne CC (5) et qui détecte les changements de tension sur le condensateur de ligne CC (5) et l'unité de commande (13) qui détecte la valeur du courant traversant l'IGBT et la diode de roue libre (D) dans les positions ouverte et fermée de l'interrupteur d'alimentation (9) en fonction des signaux reçus du circuit de détection de changement de tension (14).
  2. Cuisinière à chauffage par induction (1) selon la revendication 1, caratérisée par le circuit de détection de changement de tension (14) qui comprend un circuit diviseur de tension (15) qui divise la tension de ligne CC et un circuit de dérivation (16) connecté en série au circuit diviseur de tension (15) et qui transmet l'information différenciation de tension sur le condensateur de ligne CC (5) vers l'unité de commande (13).
  3. Cuisinière à chauffage par induction (1) selon la revendication 2, caratérisée par le circuit diviseur de tension (15) qui comprend trois résistances (R1, R2, R3) connectées en série, un premier condensateur (C1) connecté en parallèle aux première et seconde résistances (R1, R2), entre le noeud d'entrée de la première résistance (R1) et le noeud de sortie de la deuxième résistance (R2) et un second condensateur (C2) connecté en parallèle aux deuxième et troisième résistances (R2, R3), entre le noeud d'entrée du deuxième résistance (R2) et la note de sortie de la troisième résistance (R3).
  4. Cuisinière à chauffage par induction (1) selon la revendication 2 ou 3, caratérisée par le circuit de dérivation (16) qui comprend un troisième condensateur (C3) connecté en série aux résistances (R1, R2, R3) dans le circuit diviseur de tension (15) et une quatrième résistance (R4) qui est connectée entre le noeud de sortie le troisième condensateur (C3) et la masse (GND).
EP12769109.5A 2011-11-03 2012-10-08 Cuiseur à induction Active EP2774259B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201110993 2011-11-03
PCT/EP2012/069843 WO2013064329A1 (fr) 2011-11-03 2012-10-08 Cuiseur à induction

Publications (2)

Publication Number Publication Date
EP2774259A1 EP2774259A1 (fr) 2014-09-10
EP2774259B1 true EP2774259B1 (fr) 2018-12-05

Family

ID=46980969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12769109.5A Active EP2774259B1 (fr) 2011-11-03 2012-10-08 Cuiseur à induction

Country Status (3)

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EP (1) EP2774259B1 (fr)
TR (1) TR201718435T3 (fr)
WO (1) WO2013064329A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013209720A1 (de) * 2013-05-24 2014-11-27 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Ermitteln eines Stroms und Induktionsheizeinrichtung
CN108207046A (zh) * 2016-12-19 2018-06-26 佛山市顺德区美的电热电器制造有限公司 浪涌保护电路、电磁加热装置以及家用电器
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices
US20190327792A1 (en) 2018-04-23 2019-10-24 Whirlpool Corporation Control circuits and methods for distributed induction heating devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000801A1 (fr) * 1979-09-17 1981-03-19 Matsushita Electric Ind Co Ltd Installation de chauffage a induction
DE102005050036A1 (de) 2005-10-14 2007-05-31 E.G.O. Elektro-Gerätebau GmbH Induktionsheizeinrichtung und zugehöriges Betriebs- und Topferkennungsverfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2013064329A1 (fr) 2013-05-10
TR201718435T3 (tr) 2017-12-21
EP2774259A1 (fr) 2014-09-10

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