EP0625867A2 - Schaltnetzteil eines Induktionsheizgerätes - Google Patents

Schaltnetzteil eines Induktionsheizgerätes Download PDF

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Publication number
EP0625867A2
EP0625867A2 EP94401002A EP94401002A EP0625867A2 EP 0625867 A2 EP0625867 A2 EP 0625867A2 EP 94401002 A EP94401002 A EP 94401002A EP 94401002 A EP94401002 A EP 94401002A EP 0625867 A2 EP0625867 A2 EP 0625867A2
Authority
EP
European Patent Office
Prior art keywords
rectifier
power supply
supply device
diode
point
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Withdrawn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
EP94401002A
Other languages
English (en)
French (fr)
Other versions
EP0625867A3 (de
Inventor
Gérard Rilly
Laurent Jeanneteau
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.)
Compagnie Europeenne pour lEquipement Menager SA
Original Assignee
Compagnie Europeenne pour lEquipement Menager 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 Compagnie Europeenne pour lEquipement Menager SA filed Critical Compagnie Europeenne pour lEquipement Menager SA
Publication of EP0625867A2 publication Critical patent/EP0625867A2/de
Publication of EP0625867A3 publication Critical patent/EP0625867A3/de
Withdrawn legal-status Critical Current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
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the invention relates to a supply device for an induction heating appliance according to the generic term of claim 1.
  • overvoltages may be caused by the converter being cut off, due to the inductances of the sector, or by the interruption of connected motors as well as by other possible influences. It is therefore necessary to provide additional circuit elements making it possible to limit the voltage generated at the charge capacitor of the supply device and supplied to the converter.
  • the object of the invention is to provide a supply device of the type described above which, with few circuit elements, makes it possible to improve the suppression of overvoltages, in particular sudden voltage spikes, and to reduce the power dissipation. at the circuit level.
  • This object is achieved by the invention indicated in claim 1. Certain advantageous variants of the invention are mentioned in the subclaims.
  • the solution according to the invention is based on the following considerations and knowledge:
  • the charge capacitor of the first rectifier is relatively low in capacity in order to produce a rerressed voltage for the converter.
  • the charge capacitor of the second rectifier for the control power supply is much larger, since this block requires a smoothed DC voltage.
  • the much larger capacitor is also used to suppress overvoltages at the level of the first charge capacitor of the first rectifier. The diode disposed between the outputs of the two rectifiers being on as soon as an overvoltage appears, the large charge capacitor of the second rectifier is then automatically coupled in parallel with the small charge capacitor of the first rectifier.
  • the rectifier circuit of the control power supply unit having hitherto operated independently of the rectifier circuit of the power converter, is advantageously used to limit the voltage at the input of the converter.
  • the ohmic resistance mounted in parallel with the charge capacitor of the known circuit is then replaced by the input resistance of the power supply.
  • the ohmic resistance in parallel with the charge capacitor which has been necessary up to now can now be eliminated, which makes it possible to considerably reduce the overall power dissipation.
  • the solution according to the invention combines all the advantages of the two known circuits described above without having the disadvantages.
  • the technical means necessary to produce the circuit in accordance with the solution according to the invention are furthermore reduced to a minimum and consist, essentially, of the aforementioned single diode, the resistance implemented so far being eliminated. .
  • the figure shows the AC mains voltage UN applied to the mains terminals 1, the self-suppressor L, the contact a and the inductor winding A of a relay, the first rectifier D1, the charge capacitor C1, the Zener diode D4 forming a transil circuit and converter 2, which produces an alternating voltage u3 with a frequency of 30 kHz for example, intended for the heating coil 3 of an induction cooking appliance 4.
  • the charge capacitor C1 is relatively small. Essentially, it only performs HF filtering of the voltage + U1 in order to prevent the high frequency components coming from the converter 2 from reaching the circuit. Thus, a rectified voltage + U1 is applied to point P1.
  • the figure also shows a second rectifier circuit comprising the current limiting resistor R1, the second rectifier D2 and the charge capacitor C2.
  • C2 is significantly larger than C1.
  • a filtered DC voltage + U2 intended for the control power supply unit 5 which generates two supply voltages, one of +5 volts and the other of +12 volts, for control circuits. put to sleep.
  • the control current I passing through the winding of relay A, then makes it possible to switch the entire supply device to standby mode when the contact is open, and to heating mode when the contact is closed.
  • the point P1 is then connected to the point P2 via the diode D3.
  • This diode works as follows: in standby mode, contact a is open, point P1 is practically devoid of voltage, at point P2 the voltage + U2 is applied, so that diode D3 is blocked and does not have almost no effect. In heating mode, the contact a is therefore closed, the diode D3 is normally also blocked. Upon the appearance, at point P1, of an overvoltage coming from the sector or from the converter 2, the diode D3 becomes conducting. This has the effect of putting the large capacitor C2 in parallel with the relatively small capacitor C1. A large capacitor C1 + C2 then acts at the point P1 in such a way that the voltage spike at the point P1 is effectively suppressed.
  • the behavior of the transil circuit formed by the diode D4 is thereby considerably improved.
  • the power dissipation caused by the overvoltage protection circuit nevertheless remains low, since the circuit essentially comprises only lossless components and the presence of an additional ohmic resistance is no longer necessary.
  • the diode D3 Since the current i3 can have momentary intensities of 20 to 30 A at the time of an overvoltage on P1, the diode D3 will preferably be a power diode.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Rectifiers (AREA)
EP94401002A 1993-05-19 1994-05-06 Schaltnetzteil eines Induktionsheizgerätes Withdrawn EP0625867A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4316830 1993-05-19
DE19934316830 DE4316830A1 (de) 1993-05-19 1993-05-19 Netzteil für ein induktives Heizgerät

Publications (2)

Publication Number Publication Date
EP0625867A2 true EP0625867A2 (de) 1994-11-23
EP0625867A3 EP0625867A3 (de) 1994-12-14

Family

ID=6488520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401002A Withdrawn EP0625867A3 (de) 1993-05-19 1994-05-06 Schaltnetzteil eines Induktionsheizgerätes

Country Status (2)

Country Link
EP (1) EP0625867A3 (de)
DE (1) DE4316830A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6657841B1 (en) 1999-09-03 2003-12-02 Moeller Gmbh Circuit arrangement for the overvoltage protection of a power transistor for controlling an inductive load

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832621A (en) * 1971-12-27 1974-08-27 Gen Electric Reliable static power converter with control logic
SU1163414A1 (ru) * 1983-01-12 1985-06-23 Предприятие П/Я Г-4141 Устройство защиты линии и аппаратуры проводной св зи от импульсных перенапр жений
JPS60127693A (ja) * 1983-12-14 1985-07-08 三洋電機株式会社 誘導加熱装置
JPH0711985B2 (ja) * 1985-09-20 1995-02-08 ソニー株式会社 高周波加熱装置
SU1704296A1 (ru) * 1989-01-30 1992-01-07 Куйбышевский политехнический институт им.В.В.Куйбышева Устройство дл предварительной настройки колебательного контура индукционной печи
DE4101963C1 (en) * 1991-01-24 1992-02-20 Legrand Gmbh, 4770 Soest, De Protective circuit counteracting mains interference pulses - has compensating capacitor with voltage rising at most to half max. interference voltage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6657841B1 (en) 1999-09-03 2003-12-02 Moeller Gmbh Circuit arrangement for the overvoltage protection of a power transistor for controlling an inductive load

Also Published As

Publication number Publication date
EP0625867A3 (de) 1994-12-14
DE4316830A1 (de) 1994-11-24

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