EP2659733B1 - Induktionsherd - Google Patents

Induktionsherd Download PDF

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Publication number
EP2659733B1
EP2659733B1 EP11802755.6A EP11802755A EP2659733B1 EP 2659733 B1 EP2659733 B1 EP 2659733B1 EP 11802755 A EP11802755 A EP 11802755A EP 2659733 B1 EP2659733 B1 EP 2659733B1
Authority
EP
European Patent Office
Prior art keywords
voltage
induction coil
additional
limit value
capacitor
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.)
Not-in-force
Application number
EP11802755.6A
Other languages
English (en)
French (fr)
Other versions
EP2659733A2 (de
Inventor
Metin OZTURK
Namik Yilmaz
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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Filing date
Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP2659733A2 publication Critical patent/EP2659733A2/de
Application granted granted Critical
Publication of EP2659733B1 publication Critical patent/EP2659733B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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 the 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 energy efficiency of induction heating cookers is considerably high since the heat required for cooking is not generated in the gas or electric burners on the cooker but directly in the cooking container.
  • high amount of electric current is conducted through electronic switching elements like the power switch (IGBT-Insulated Gate Bipolar Transistor or Mosfet) and the diode bridge on the circuit board.
  • the quasi resonant converter circuit realized by one IGBT and one resonant capacitor that provides cost advantage is used besides the half bridge series resonant converter realized by using two switches and two resonant capacitors.
  • the resonant capacitor is connected in parallel with the induction coil in contrast to the half bridge series resonant converter circuit wherein the induction coils and the resonant capacitors are connected in series.
  • One end of the IGBT switch is connected in series to one end of the parallel connected coil and capacitor and the other end is connected to the reference output point of the rectified voltage.
  • This structure that is connected in series is connected to the intermediate circuit voltage.
  • the disadvantage of this drive circuit is that it can work in narrower power frequency range and the maximum value thereof is limited.
  • the basic parameter limiting the operating range is that in low load conditions, the voltage occurring on the switch during switching does not to fall to zero and results in high losses on the switches and the drawing of high value capacitor charge currents in the IGBT switch.
  • the transmission operating conditions in the quasi resonant structure having low cost single IGBT and single resonant capacitor is determined largely by the load itself.
  • the control and switching electronics are expected to energize the load at suitable moments.
  • the aim of the present invention is the realization of an induction heating cooker wherein the power losses are decreased.
  • 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 at least one additional capacitor parallel to the resonant capacitor and the induction coil connected parallel to each other.
  • the induction coil is provided to operate in a wide power range by activating or deactivating the additional capacitor by the control unit.
  • the additional capacitor When the voltage passing through the induction coil gets near the upper limit, the additional capacitor is activated by the control unit and provides the induction coil to be able to operate at higher power level. When the voltage passing through the induction coil gets near the lower limit, the additional capacitor is deactivated by the control unit, thereby providing the induction coil to operate at lower power level.
  • the induction heating cooker comprises two additional capacitors and the induction coil is operated at three different levels.
  • the resonant capacitor is conducting at all levels. In the high power level, both of the additional capacitors are conducting. In the middle power level only one of the additional capacitors is conducting.
  • the operating range of the induction coil and the highest and lowest power levels of usability are increased by making the total capacity value of the capacitors connected parallel to the induction coil variable.
  • the induction heating cooker (1) comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).
  • the induction heating cooker (1) comprises at least one additional capacitor (8, 108) connected in parallel to the induction coil (7).
  • the induction heating cooker (1) furthermore comprises a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
  • a voltage detecting circuit (10) one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K)
  • a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (V
  • the induction coil (7) can be operated at different power levels by an adjustment means (not shown in the figures) that is actuated by the user.
  • the induction heating cooker (1) furthermore comprises a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
  • the control unit (11) activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108).
  • the total capacity value increases and the induction coil (7) can be driven at high power level since the additional capacitor (8, 108) that starts conducting and the resonant capacitor (6) are connected in parallel.
  • the control unit (11) provides to cut off the current conducted through at least one of the additional capacitors (8, 108) by deactivating at least one of the switches (9, 109).
  • the total capacity value decreases and the induction coil (7) can be operated at low power level since the switched off additional capacitor (8, 108) and the resonant capacitor (6) are connected in parallel.
  • the induction heating cooker (1) comprises a current detecting circuit (12) that measures the current at the output of the power switch (5) and a power switch drive circuit (13) that activates or deactivates the power switch (5).
  • the current detecting circuit (12) detects the momentary peaks in the current (I) when the voltage (V1) measured at the collector point (K) reaches the voltage lower limit value (Va) if the induction coil (7) is driven at low power level.
  • the current detecting circuit (12) transmits the detected momentary current (I) peaks to the control unit (11).
  • the control unit (11) deactivates the additional capacitors (8, 108) at the momentary current (I) peaks.
  • the induction heating cooker (1) comprises two additional capacitors (8, 108) and two switches (9, 109).
  • the induction coil (7) is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales by means of an adjustment means (not shown in the figures) that is actuated by the user.
  • Only the resonant capacitor (6) is activated while the induction coil (7) is operated at low power level (A1).
  • the control unit (11) does not activate the additional capacitors (8, 108).
  • the resonant capacitor (6) and the first additional capacitor (8) are conducting while the induction coil (7) is operated at middle power level (A2).
  • the control unit (11) does not activate the other additional capacitor (108).
  • the resonant capacitor (6) and the additional capacitors (8, 108) are conducting while the induction coil (7) is operated at high power level (A3).
  • the induction coil (7) is provided to be driven electrically safely and in a wide range of power by means of activating or deactivating the additional capacitors (8, 108) connected in parallel to the induction coil (7) by the control unit (11) depending on the power value whereat the induction coil (7) is operated.
  • the additional capacitors (8, 108) connected parallel to the resonant capacitor (6) passing of momentary high voltage through the power switch (5) and damaging of the power switch (5) are prevented.

Landscapes

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

Claims (3)

  1. Induktionsherd (1), umfassend eine Netzstromfilterschaltung (2), einen Diodenbrückengleichrichter (3), der es ermöglicht, dass Wechselstrom vom Stromnetz in Gleichstrom umgewandelt wird, eine Filterschaltung (4), die Hochfrequenzrauschen aus dem Spannungssignal vom Diodenbrückengleichrichter (3) entfernt, einen Leistungsschalter (5), der die Spannung von der Filterschaltung (4) auf Hochfrequenzspannung treibt, eine Induktionsspule (7), die in Reihe mit dem Ende des Leistungsschalters (5) verbunden ist und ermöglicht, dass der darauf abgestellte ferromagnetische Kochbehälter mit dem erzeugten Magnetfeld erwärmt wird, und einen Resonanzkondensator (6), der parallel mit der Induktionsspule (7) verbunden ist, wobei wenigstens ein Zusatzkondensator (8, 108) parallel mit der Induktionsspule (7) verbunden ist und wobei ein Schalter (9, 109) in Reihe mit jedem Zusatzkondensator (8, 108) verbunden ist,
    gekennzeichnet durch eine Spannungsdetektionsschaltung (10), deren eines Ende vor dem Leistungsschalter (5) mit dem Kollektorpunkt (K) verbunden ist und die die Spannung (V1) an dem Kollektorpunkt (K) misst, und eine Steuereinheit (11), die die Spannung (V1) an dem Kollektorpunkt (K), die von der Spannungsdetektionsschaltung (10) gemessen wird, mit einem oberen Spannungsgrenzwert (Vu) und einem unteren Spannungsgrenzwert (Va) vergleicht, die im Voraus vom Hersteller in ihrem Speicher aufgezeichnet wurden, und die Zusatzkondensatoren (8, 108) aktiviert oder deaktiviert, wenn die Spannung (V1) an dem Kollektorpunkt (K) bei dem oberen Spannungsgrenzwert (Vu) und dem unteren Spannungsgrenzwert (Va) liegt, indem die Steuereinheit (11) wenigstens einen der Schalter (9, 109) aktiviert und dadurch ermöglicht, dass Strom durch wenigstens einen der Zusatzkondensatoren (8, 108) geleitet wird, wenn die Spannung (V1), die an dem Kollektorpunkt (K) gemessen wird, sich dem oberen Spannungsgrenzwert (Vu) nähert, und wenigstens einen der Schalter (9, 109) deaktiviert und dadurch ermöglicht, dass der Strom, der durch wenigstens einen der Zusatzkondensatoren (8, 108) geleitet wird, unterbrochen wird, wenn die Spannung (V1), die an dem Kollektorpunkt (K) gemessen wird, sich dem unteren Spannungsgrenzwert (Va) nähert.
  2. Induktionsherd (1) nach Anspruch 1, gekennzeichnet durch zwei Zusatzkondensatoren (8, 108) und zwei Schalter (9, 109) und dadurch, dass die Induktionsspule (7) auf drei verschiedenen Pegeln (A1, A2, A3) und drei verschiedenen Leistungsstufen auf jedem Pegel (A1, A2, A3), insgesamt auf neun verschiedenen Leistungsstufen, betrieben wird.
  3. Induktionsherd (1) nach Anspruch 2, dadurch gekennzeichnet, dass die Steuereinheit (11) nur den Resonanzkondensator (6) aktiviert und nicht die Zusatzkondensatoren (8, 108) aktiviert, während die Induktionsspule (7) auf dem Niedrigleistungspegel (A1) betrieben wird, den Resonanzkondensator (6) und den ersten Zusatzkondensator (8) aktiviert und den anderen Zusatzkondensator (108) nicht aktiviert, während die Induktionsspule (7) auf dem mittleren Leistungspegel (A2) betrieben wird, und den Resonanzkondensator (6) und die Zusatzkondensatoren (8, 108) aktiviert, während die Induktionsspule (7) auf dem Hochleistungspegel (A3) betrieben wird.
EP11802755.6A 2010-12-31 2011-12-26 Induktionsherd Not-in-force EP2659733B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201011265 2010-12-31
PCT/EP2011/074049 WO2012089707A2 (en) 2010-12-31 2011-12-26 An induction heating cooker

Publications (2)

Publication Number Publication Date
EP2659733A2 EP2659733A2 (de) 2013-11-06
EP2659733B1 true EP2659733B1 (de) 2017-04-05

Family

ID=45422157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11802755.6A Not-in-force EP2659733B1 (de) 2010-12-31 2011-12-26 Induktionsherd

Country Status (2)

Country Link
EP (1) EP2659733B1 (de)
WO (1) WO2012089707A2 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2744299A1 (de) * 2012-12-11 2014-06-18 BSH Bosch und Siemens Hausgeräte GmbH Hausgeräteinduktionsheizvorrichtung
GB2512041A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Resistance determination for temperature control of heated automotive components
GB2512040A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Using resistance equivalent to estimate heater temperature of an exhaust gas after-treatment component
GB2512042A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Resistance determination with increased sensitivity for temperature control of heated automotive component
GB2512039A (en) 2012-12-31 2014-09-24 Continental Automotive Systems Using resistance equivalent to estimate temperature of a fuel-njector heater
CN105451384A (zh) * 2014-07-31 2016-03-30 E.G.O.电气设备制造股份有限公司 感应加热***
CN106136933B (zh) * 2015-04-07 2018-09-11 佛山市顺德区美的电热电器制造有限公司 烹饪器具及用于烹饪器具的电加热装置
EP3836753B1 (de) * 2019-12-13 2023-09-06 Electrolux Appliances Aktiebolag Verfahren und system zur steuerung eines qr-wechselrichters in einem induktionskochgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1160297A (en) * 1979-09-17 1984-01-10 Takumi Mizukawa Induction heating apparatus incorporating an inverter circuit capable of broad output control
DE3607125C1 (de) * 1986-03-05 1987-08-27 Aeg Elotherm Gmbh Stromversorgungsanlage fuer mehrere parallel an Sammelschienen anschliessbare,eine Last bildende Parallelschwingkreise
EP0888033B1 (de) * 1996-03-13 2005-01-26 Matsushita Electric Industrial Co., Ltd. Hochfrequenz-wechselrichter und induktionskochverrichtung unter verwendung desselben
FR2773014B1 (fr) * 1997-12-23 2000-03-03 Europ Equip Menager Dispositif d'alimentation de plusieurs circuits resonants par un generateur de puissance a onduleur

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP2659733A2 (de) 2013-11-06
WO2012089707A2 (en) 2012-07-05
WO2012089707A3 (en) 2013-02-07

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