EP0734639B1 - Wechselstromerzeuger mit sättigbarer reaktanz - Google Patents

Wechselstromerzeuger mit sättigbarer reaktanz Download PDF

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Publication number
EP0734639B1
EP0734639B1 EP95901493A EP95901493A EP0734639B1 EP 0734639 B1 EP0734639 B1 EP 0734639B1 EP 95901493 A EP95901493 A EP 95901493A EP 95901493 A EP95901493 A EP 95901493A EP 0734639 B1 EP0734639 B1 EP 0734639B1
Authority
EP
European Patent Office
Prior art keywords
ripple current
current generator
generator according
saturable
switch
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.)
Expired - Lifetime
Application number
EP95901493A
Other languages
English (en)
French (fr)
Other versions
EP0734639A1 (de
Inventor
Michel Auguste Malnoe
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.)
Moulinex SA
Original Assignee
Moulinex SA
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 Moulinex SA filed Critical Moulinex SA
Publication of EP0734639A1 publication Critical patent/EP0734639A1/de
Application granted granted Critical
Publication of EP0734639B1 publication Critical patent/EP0734639B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 a ripple current generator for use in an induction heater.
  • Generators of this type are known and the one described in the present application comprises an oscillating circuit consisting of a current injection choke, a capacitor, an induction heating coil and a controlled power switch. at high frequency.
  • induction heating consists in applying a current which varies at a relatively high frequency up to a few tens of kilohertz to a coil which serves as an inductor and which is placed near a body of a conductive object. electricity so that eddy currents develop there and generate a significant amount of heat by the Joule effect.
  • Existing devices, implementing this heating principle have the disadvantage of being sensitive to coupling, that is to say that the transmitted heating power varies when the size of the object to be heated varies. More particularly, it is known that when such generators are used in induction hobs intended to heat food contained in a container, the maximum heating power transmitted to the container containing the food to be heated is smaller the smaller the diameter. from the bottom of this container is small.
  • Document FR-A-2 305 089 describes a corrugated current generator having a saturable injection choke.
  • the object of the invention is to provide a device which makes it possible to induce a power which does not depend on the dimensions of the body to be heated and which makes it possible to obtain a high heating power even for small kitchen containers.
  • the generator described here comprises a current injection reactor of the saturable type connected in series with a parallel assembly formed by two branches, ie a first branch B 1 containing the power switch, and a second branch B 2 containing the capacitor connected in series with the induction heating coil.
  • the device according to the invention therefore makes it possible to vary the power continuously from a low value of approximately 100 Watts to a value of approximately 2.5 kilowatts whatever the size of the container used. This advantage is essential in the case of domestic use of the generator in an induction hob, where the low powers, often necessary for simmering, are obtained without cycling.
  • Another essential advantage of the generator according to the invention lies in the use of a saturable current injection choke by construction which does not require any additional device to reach saturation and which operates automatically in saturation during the resonance phase of the oscillating circuit. .
  • an important consequence of the use of such a saturable choke is the achievement of self-adaptability of the generator to the load.
  • the generator according to the invention makes it possible to obtain a heating power independent of the dimensions of the body to be heated which can vary over a wide range and whose value is chosen only by the user.
  • the corrugated current generator 1 is intended to be used in an induction heating appliance of the hot plate type and is supplied by the mains, said generator comprises in a manner known per se a rectifier bridge 2 preceded by an anti-parasite filter 3 and followed by a low-pass filter 4 comprising a coil 5 and a capacitor 7.
  • a first output terminal 8 of said rectifier bridge 2 is connected to a first terminal of the coil 5, the second terminal of the coil 5 being connected to a terminal common to a current injection choke 6 and to the capacitor 7.
  • the second terminal 9 of the current injection choke 6 is connected to a first terminal of the parallel-assembly constituted of two branches B 1 and B 2 .
  • the second terminal 10 of this parallel assembly is connected to the second terminal of the capacitor 7 and to the second output terminal 11 of the rectifier bridge 2.
  • the branch B 1 comprises an electronic switch 12, while the branch B 2 comprises a capacitor 13 mounted in series with a coil forming the inductor 14.
  • the coil 5 and the capacitor 7 constitute the low-pass filter 4 which makes it possible to avoid the return to the sector of steep edges of voltages which may appear in the oscillating circuit.
  • the graph represents the power absorbed as a function of the supply voltage in a generator of the prior art as described above.
  • This graph shows that when the supply voltage varies from 180 V to 260 V the induced heating power does not exceed 2 kilowatts when using vessels having diameters ranging from 95 mm to 165 mm.
  • the current injection choke is a saturable choke and is mounted in series with a parallel assembly formed by two branches, ie a first branch B 1 containing the switch referenced 12 in FIG. 1 and 21 in the Figure 4 and a second branch B 2 containing a capacitor 13 mounted in series with the induction heating coil 14.
  • Said inductor 6 comprises a magnetic circuit which automatically reaches saturation when its winding is traversed by a current of predetermined value.
  • This magnetic circuit as shown in FIGS. 5a and 5b comprises two identical pieces 16 in the form of an E in ferrite connected by their respective side bars 17 while the respective central cores 18 are separated by a gap of 4 mm.
  • said choke 6 is saturable by construction and comprises a winding of 46 turns formed by 60 strands of 0.2 mm in diameter.
  • Said inductor 6 is characterized by the fact that it comprises a magnetic circuit which automatically reaches saturation when its winding is traversed by a current of predetermined value.
  • the switch 12 of the branch B 1 as illustrated in FIG. 1 is a power transistor of the IGBT type connected in series with a power diode 19. The diode 19 allowing the application of a reverse voltage across the terminals of the power transistor when the latter is blocked.
  • a CMD control device referenced 20 controls the high frequency switching of the power transistor during the resonance phase of the oscillating circuit, when the current in the branch B 1 is zero. Said control device 20 also makes it possible to avoid the overvoltage which may develop at the terminals of the power transistor.
  • the inductor 6 when the inductor 6 is saturable, a generator is obtained which makes it possible to induce a heating power which varies over a wide range and whose value does not depend on the dimensions of the container to be heated.
  • the power absorbed, for different supply voltages varying from 180 V to 270 V is greater than 2 kilowatts with the exception of the case where the diameter of the kitchen utensil is 95 mm and the supply voltage is greater than 230 V.
  • the high frequency controlled switch is a thyristor 21 of the MOS CONTROLLED THYRISTOR (MCT) type, symmetrical in voltage.
  • MCT MOS CONTROLLED THYRISTOR
  • the use of this type of switch eliminates the power diode 19 in the branch B 1 .
  • this embodiment allows a significant improvement in efficiency and a reduction in size. Indeed, the total voltage drop across the terminals of branch B 1 according to FIG. 1 when it contains the power transistor of the IGBT type 12 in series with the power diode 19 is 6.1 V while in the assembly of FIG. 4, in which the branch B 1 contains only the MOS CONTROLLED THYRISTOR 21, this voltage drop is only 1.6 V. This results in a power gain of at least 3.8.
  • the impedance of the saturable inductor 6 has a value of 250 ⁇ H
  • the capacitance of the capacitor 13 has a value of 188 nF
  • the impedance of the inductor 14 to vacuum has a value of 66 ⁇ H
  • the power switch is chosen so that the breakdown voltage does not exceed 1200 V.
  • the tests have been carried out for a value of the saturation current of the choke 6 of the order 17 amps at room temperature.
  • the tests in FIG. 7 were carried out for a power of 1500 W at a frequency of 29.6 Hz and the tests in FIG. 8 were carried out for a power of 1500 W at a frequency of 31.5 kHz.
  • the generator according to the invention therefore makes it possible to obtain a simple and inexpensive device which operates over a wide range of power and whose heating power does not depend on the dimensions of the container containing the food to be heated.
  • This device also makes it possible to significantly improve the coefficient of use of silicon for small loads. This allows the user to obtain a high desired power regardless of the load, with an economical switch. In addition, thanks to the reduction of overvoltage at the terminals of the switch 12,21, it is possible to maintain a high power on low loads, despite poor coupling.
  • the invention also applies to induction heating generators intended to be incorporated into housings of apparatuses such as for example steam cookers, rice cookers, fryers. It also applies to industrial induction heating machines intended for the treatment of metal parts.

Landscapes

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

Claims (9)

  1. Wechselstromgenerator, der zur Verwendung in einer Induktionsheizvorrichtung bestimmt ist und einen Schwingkreis aufweist, der aus einer Strominjektionsreaktanz (6), einem Kondensator (13), einer Induktionsheizspule (14) und einem Leistungsschalter (12, 21) besteht, der mit Hochfrequenz gesteuert wird, wobei die Strominjektionsreaktanz (6) vom sättigbaren Typ ist, dadurch gekennzeichnet, daß die Strominjektionsreaktanz (6) in Reihe mit einer Paralleleinheit geschaltet ist, die aus zwei Zweigen gebildet ist, nämlich einem ersten Zweig B1 mit dem Schalter (12, 21) und einem zweiten Zweig B2 mit dem Kondensator (13), der in Reihe mit der Induktionsheizspule (14) geschaltet ist.
  2. Wechselstromgenerator nach Anspruch 1,
    dadurch gekennzeichnet, daß der Schalter (12) ein Leistungstransistor des Typs IGBT ist, der einer Leistungsdiode (19) zugeordnet ist.
  3. Wechselstromgenerator nach Anspruch 1,
    dadurch gekennzeichnet, daß der Schalter (21) vom Typ eines spannungssymmetrischen MOS-Controlled Thyristor (MCT) ist.
  4. Wechselstromgenerator nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß er eine Einrichtung (20) aufweist, die die Hochfrequenzumschaltung des Leistungsschalters (12, 21) steuert, wenn der Strom in dem Zweig B1 null ist.
  5. Wechselstromgenerator nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß er eine Spannungsgleichrichterbrükke (2) aufweist, der ein Entstörfilter (3) vorausgeht und ein Tiefpaßfilter (4) folgt.
  6. Wechselstromgenerator nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß der durch die Strominjektionsreaktanz (6) fließende Wechselstrom einen Sättigungswert in der Größenordnung von 17 Ampere aufweist.
  7. Wechselstromgenerator nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß er in Gehäuse von Geräten wie Dampfkochtöpfe, Reiskocher und Friteusen aufgenommen ist.
  8. Wechselstromgenerator nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß die Strominjektionsreaktanz (6) einen Magnetkreis aufweist, der automatisch sättigbar ist.
  9. Wechselstromgenerator nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß der Magnetkreis der Strominjektionsreaktanz (6) während der Resonanzphase des Schwingkreises automatisch die Sättigung erreicht.
EP95901493A 1993-11-15 1994-11-15 Wechselstromerzeuger mit sättigbarer reaktanz Expired - Lifetime EP0734639B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9313587 1993-11-15
FR9313587A FR2712763B1 (fr) 1993-11-15 1993-11-15 Générateur de courant ondulé à self saturable.
PCT/FR1994/001334 WO1995014364A1 (fr) 1993-11-15 1994-11-15 Generateur de courant ondule a self saturable

Publications (2)

Publication Number Publication Date
EP0734639A1 EP0734639A1 (de) 1996-10-02
EP0734639B1 true EP0734639B1 (de) 1997-09-03

Family

ID=9452850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95901493A Expired - Lifetime EP0734639B1 (de) 1993-11-15 1994-11-15 Wechselstromerzeuger mit sättigbarer reaktanz

Country Status (10)

Country Link
US (1) US5854473A (de)
EP (1) EP0734639B1 (de)
JP (1) JP3724804B2 (de)
KR (1) KR100318806B1 (de)
CN (1) CN1067836C (de)
DE (1) DE69405412T2 (de)
ES (1) ES2106632T3 (de)
FR (1) FR2712763B1 (de)
TW (1) TW277178B (de)
WO (1) WO1995014364A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6870144B2 (en) * 2002-12-24 2005-03-22 Lg Electronics Inc. Inverter circuit of induction heating rice cooker
US7034263B2 (en) * 2003-07-02 2006-04-25 Itherm Technologies, Lp Apparatus and method for inductive heating
US7279665B2 (en) * 2003-07-02 2007-10-09 Itherm Technologies, Lp Method for delivering harmonic inductive power
US7323666B2 (en) 2003-12-08 2008-01-29 Saint-Gobain Performance Plastics Corporation Inductively heatable components
KR20050103704A (ko) * 2004-04-27 2005-11-01 엘지전자 주식회사 유도가열 조리기기의 인버터 회로 제어장치
DE102008015036A1 (de) * 2008-03-14 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Vorrichtung und Verfahren zur Ansteuerung von Induktionsheizeinrichtungen eines Induktionskochfeldes
CN103063326B (zh) * 2011-09-21 2017-03-15 中兴通讯股份有限公司 一种测量电解电容器温度的方法和***
CN104284466B (zh) * 2013-07-11 2016-05-11 美的集团股份有限公司 智能多电磁加热单元的控制电路
CN106292820B (zh) * 2016-08-05 2017-09-08 广州金升阳科技有限公司 一种纹波电流产生电路

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE776498A (fr) * 1971-12-10 1972-06-12 Elphiac Sa Dispositif multiplicateur de frequence pour applications de chauffage par induction,
US3742173A (en) * 1971-12-27 1973-06-26 Gen Electric Method and equipment for cooking electronically by specifying watts setting
SE408518B (sv) * 1974-05-17 1979-06-11 Matsushita Electric Ind Co Ltd Induktionsuppvermningsanordning
JPS5146444A (en) * 1974-10-18 1976-04-20 Matsushita Electric Ind Co Ltd Koshuhakanetsusochi
JPS51108343A (de) * 1975-03-19 1976-09-25 Matsushita Electric Ind Co Ltd
DE2648758A1 (de) * 1976-10-27 1978-05-03 Sachs Systemtechnik Gmbh Sinusleistungsgenerator
GB2085243B (en) * 1980-09-03 1984-11-21 Cheltenham Induction Heating L Apparatus for driving a heating load circuit
FR2495876B1 (fr) * 1980-12-05 1985-06-07 Scholtes Ets Eugen Dispositif electronique de chauffage a induction
US4506131A (en) * 1983-08-29 1985-03-19 Inductotherm Industries Inc. Multiple zone induction coil power control apparatus and method
GB2197995B (en) * 1986-11-25 1991-06-19 Ti Creda Ltd Improvements in or relating to induction heating circuits for cooking appliances
US5059762A (en) * 1989-10-31 1991-10-22 Inductotherm Europe Limited Multiple zone induction heating
US5055648A (en) * 1989-12-27 1991-10-08 Rockwell International Corporation Apparatus and method for mechanical properties testing
JP2982364B2 (ja) * 1991-05-14 1999-11-22 松下電器産業株式会社 誘導加熱用インバータ

Also Published As

Publication number Publication date
DE69405412T2 (de) 1998-01-15
TW277178B (de) 1996-06-01
ES2106632T3 (es) 1997-11-01
CN1135827A (zh) 1996-11-13
DE69405412D1 (de) 1997-10-09
JP3724804B2 (ja) 2005-12-07
FR2712763B1 (fr) 1996-02-02
EP0734639A1 (de) 1996-10-02
US5854473A (en) 1998-12-29
KR100318806B1 (ko) 2002-04-22
KR960706280A (ko) 1996-11-08
FR2712763A1 (fr) 1995-05-24
JP2002512726A (ja) 2002-04-23
CN1067836C (zh) 2001-06-27
WO1995014364A1 (fr) 1995-05-26

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