EP0054445A1 - Elektronische Induktionsheizvorrichtung - Google Patents

Elektronische Induktionsheizvorrichtung Download PDF

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Publication number
EP0054445A1
EP0054445A1 EP81401726A EP81401726A EP0054445A1 EP 0054445 A1 EP0054445 A1 EP 0054445A1 EP 81401726 A EP81401726 A EP 81401726A EP 81401726 A EP81401726 A EP 81401726A EP 0054445 A1 EP0054445 A1 EP 0054445A1
Authority
EP
European Patent Office
Prior art keywords
oscillating circuit
switches
circuit
electronic
tyristors
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.)
Granted
Application number
EP81401726A
Other languages
English (en)
French (fr)
Other versions
EP0054445B1 (de
Inventor
Maurice Scholtes
Roger Eisenberg
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.)
Eugene Scholtes SA
Original Assignee
Eugene Scholtes 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 Eugene Scholtes SA filed Critical Eugene Scholtes SA
Priority to AT81401726T priority Critical patent/ATE15576T1/de
Publication of EP0054445A1 publication Critical patent/EP0054445A1/de
Application granted granted Critical
Publication of EP0054445B1 publication Critical patent/EP0054445B1/de
Expired 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

Definitions

  • the present invention relates to electronic devices: induction heating.
  • the object of the present invention is therefore. to eliminate one of these three conditions, in this case that relating to the fact of being able to withstand a repetitive maximum voltage in the blocked state, so as to produce an induction heating device, the design of which is such that it has a very high reliability, despite the performance limits of electronic components currently on the market.
  • this device is characterized in that its oscillating circuit, which comprises a capacitor and a choke in parallel, is connected to the supply circuit by two electronic switches - for example two tyristors - subject to a control circuit making them switch together, so that, when these two switches close, the oscillating circuit is referenced between these two supply lines and, thereby, loaded with energy.
  • oscillating circuit which comprises a capacitor and a choke in parallel
  • the oscillating circuit 1 of the corresponding device is constituted by a circuit known under the name "plug circuit".
  • This includes a plane inductor 2 mounted in parallel with a capacitor 3, the values of which are such that the circuit resonates at the desired frequency, for example 25'k.Hertz in the above-mentioned case of a household appliance.
  • the inductor 2 then acts as the primary winding, the secondary being constituted by the charge to be heated, in the corresponding appliance, in this case a cooking utensil (saucepan, frying pan, etc.).
  • the oscillating circuit 1 is connected to the two lines 5 and 6 of the supply circuit by means of two electronic switches, which are therefore located on either side of this oscillating circuit.
  • each of these switches consists of a tyristor 7 with which is mounted in anti-parallel a diode 8 whose direction of conduction is therefore opposite.
  • each of the tyristors 7 is connected to a very simplified control circuit in the example and designated by the general reference.
  • the arrangement of this circuit is such that the tyristors operate at the resamance frequency of the oscillating circuit 1 in opening and closing at the same time.
  • This circuit includes a. astable type 10 control oscillator, tracking. one, or even several, transiston (s) making it possible to obtain control pulses compatible in duration, in polarity and in power to correctly control the switches, of power.
  • the plug circuit is perfectly adequate to fulfill this additional role. Indeed, the phenomena of overvoltage of such circuits feels well known.
  • This inductor can be formed in different ways, for example on air, on a nucleus of different shapes, or more simply by passing the power wire of the oscillating circuit through a toroid of good value.
  • This small choke has the effect of slowing down or rather delaying the action of the heating choke 2, which results in a induction time of the tyristors of the order of 10 ⁇ seconds in the example.
  • the oscillating circuit is charged with energy through the two power tyristors 7.
  • the plug circuit is then normally referenced between lines 5 and 6 of the supply circuit.
  • the oscillating circuit (comparable in this phase to an energy generator) will, for reference, find at its terminals the open switches 7. The latter therefore serve as a reference for the oscillating circuit, which has the effect of trying to center the voltages across the terminals of this circuit between two very large impedances.
  • each switch supports at its terminals the half of the voltage developed by the oscillating circuit, ie 300 volts in the example.
  • this-tensicn is of the order of 600 to 700 volts instead of 800 to 900 volts.
  • the particular design of the device according to the invention therefore greatly multiplies the safety coefficients, since the voltages at the terminals of the switches are divided by two.
  • this design has the advantage of eliminating the usual drawbacks of electronic induction heating devices, including the risks of thermal runaway of the active components (power switch). Indeed, in this case, a switch effectively protects the other, knowing that the components are never perfectly identical, and moreover, never exposed to the same temperatures.
  • the main advantage of the device according to the invention lies in the fact that, for the same voltage of the oscillating circuit, the voltage safety margin of the electronic switches is considerably increased.
  • the device according to the invention is not limited to the single preferred example described above.
  • the oscillating circuit of this device can be produced differently.
  • the power tyristors could be replaced by power transistors, with a few touch-ups inherent in the equipment used.
  • FIG. 3 represents the diagram of an embodiment in which the tyristors 7 of the previous example are replaced by transistors 7a.
  • the present device is not limited to the production of cooking appliances for household use, since it can be the subject of various applications.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Inverter Devices (AREA)
  • Near-Field Transmission Systems (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Air-Conditioning For Vehicles (AREA)
EP81401726A 1980-12-05 1981-10-28 Elektronische Induktionsheizvorrichtung Expired EP0054445B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81401726T ATE15576T1 (de) 1980-12-05 1981-10-28 Elektronische induktionsheizvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8025847 1980-12-05
FR8025847A FR2495876B1 (fr) 1980-12-05 1980-12-05 Dispositif electronique de chauffage a induction

Publications (2)

Publication Number Publication Date
EP0054445A1 true EP0054445A1 (de) 1982-06-23
EP0054445B1 EP0054445B1 (de) 1985-09-11

Family

ID=9248708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401726A Expired EP0054445B1 (de) 1980-12-05 1981-10-28 Elektronische Induktionsheizvorrichtung

Country Status (4)

Country Link
EP (1) EP0054445B1 (de)
AT (1) ATE15576T1 (de)
DE (1) DE3172256D1 (de)
FR (1) FR2495876B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269417A1 (de) * 1986-11-25 1988-06-01 Creda Limited Induktionsheizkreise für Kochgeräte
GB2197995A (en) * 1986-11-25 1988-06-02 Ti Creda Ltd Induction heating circuits for cooking appliances
FR2712763A1 (fr) * 1993-11-15 1995-05-24 Moulinex Sa Générateur de courant ondulé à self saturable.
WO1995022237A1 (en) * 1994-02-10 1995-08-17 Aktiebolaget Electrolux An energy converter for heating units for foodstuffs
WO1995024817A1 (en) * 1994-03-09 1995-09-14 Aktiebolaget Electrolux A circuit for the control of energy supply in a resonance converter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2180584A1 (de) * 1972-04-21 1973-11-30 Thomson Csf
DE2634667A1 (de) * 1975-08-04 1977-02-17 Ajax Magnethermic Corp Leistungssteller
FR2430679A1 (fr) * 1978-07-04 1980-02-01 Orega Electro Mecanique Circuit de securite, notamment de temperatures maximales, pour plaque de cuisson par induction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2180584A1 (de) * 1972-04-21 1973-11-30 Thomson Csf
DE2634667A1 (de) * 1975-08-04 1977-02-17 Ajax Magnethermic Corp Leistungssteller
FR2430679A1 (fr) * 1978-07-04 1980-02-01 Orega Electro Mecanique Circuit de securite, notamment de temperatures maximales, pour plaque de cuisson par induction

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269417A1 (de) * 1986-11-25 1988-06-01 Creda Limited Induktionsheizkreise für Kochgeräte
GB2197995A (en) * 1986-11-25 1988-06-02 Ti Creda Ltd Induction heating circuits for cooking appliances
GB2197995B (en) * 1986-11-25 1991-06-19 Ti Creda Ltd Improvements in or relating to induction heating circuits for cooking appliances
FR2712763A1 (fr) * 1993-11-15 1995-05-24 Moulinex Sa Générateur de courant ondulé à self saturable.
WO1995014364A1 (fr) * 1993-11-15 1995-05-26 Moulinex S.A. Generateur de courant ondule a self saturable
WO1995022237A1 (en) * 1994-02-10 1995-08-17 Aktiebolaget Electrolux An energy converter for heating units for foodstuffs
US6043470A (en) * 1994-02-10 2000-03-28 Aktiebolaget Electrlux Energy converter for electromagnetic induction heating units for foodstuffs
WO1995024817A1 (en) * 1994-03-09 1995-09-14 Aktiebolaget Electrolux A circuit for the control of energy supply in a resonance converter
US5914066A (en) * 1994-03-09 1999-06-22 Aktiebolaget Electrolux Circuit for the control of energy supply in a resonance converter

Also Published As

Publication number Publication date
ATE15576T1 (de) 1985-09-15
EP0054445B1 (de) 1985-09-11
FR2495876A1 (fr) 1982-06-11
FR2495876B1 (fr) 1985-06-07
DE3172256D1 (en) 1985-10-17

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