EP0397209A2 - Surveillance électronique de porte pour fours à micro-ondes - Google Patents

Surveillance électronique de porte pour fours à micro-ondes Download PDF

Info

Publication number
EP0397209A2
EP0397209A2 EP90109007A EP90109007A EP0397209A2 EP 0397209 A2 EP0397209 A2 EP 0397209A2 EP 90109007 A EP90109007 A EP 90109007A EP 90109007 A EP90109007 A EP 90109007A EP 0397209 A2 EP0397209 A2 EP 0397209A2
Authority
EP
European Patent Office
Prior art keywords
power supply
core part
door
transformer
legs
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
EP90109007A
Other languages
German (de)
English (en)
Other versions
EP0397209A3 (fr
EP0397209B1 (fr
Inventor
Udo Mai
Uwe Hartmann
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.)
Vogt Electronic AG
Original Assignee
Vogt Electronic AG
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 Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of EP0397209A2 publication Critical patent/EP0397209A2/fr
Publication of EP0397209A3 publication Critical patent/EP0397209A3/fr
Application granted granted Critical
Publication of EP0397209B1 publication Critical patent/EP0397209B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H05B6/64—Heating using microwaves
    • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
    • H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits

Definitions

  • the invention relates to electronic door monitoring of microwave ovens which have a switching power supply for the power supply of the magnetron.
  • the invention has for its object to provide an electronic door monitoring of microwave ovens with a switching power supply, which is characterized by a much larger security standard compared to the known door locks with mechanically operated electrical switch.
  • the power supply to the magnetron is immediately interrupted with absolute certainty when the loading door is opened or is open, because then because of the decoupling of the inductive component associated therewith, the separate part of the separate part of its supply function for the control circuit of the switching transistor of the magnetron switching power supply is reliable loses without the need for any mechanical switching functions.
  • the decoupling comes solely from the increase in the distance between the housing and the door, i.e. by enlarging the "air gap" in the inductive component.
  • the separate power supply unit can be designed either in the usual mains frequency (e.g. 50 Hz) technology (claim 2) or as a switching power supply unit (claims 3 to 5), in each case with a transformer an at least two legs having a first core part and a second core part bridging these legs is used, the first core part being assigned to the housing and the second core part of the door such that the magnetic flux is interrupted when the door is opened.
  • An EI or UI transformer is particularly suitable as a transformer.
  • the second core part moves away from the first core part, which leads to an immediate considerable increase in the resistance in the magnetic circuit, so that the secondary voltage be it in the normal transformer, be it in the transformer of the switching power supply, be it in the additional transformer drops to values for the control of the control scarf device of the switching transistor of the magnetron switching power supply is no longer sufficient.
  • a certain coupling remaining via leakage inductances or possibly through targeted additional measures between the primary and the secondary side of the normal transformer according to claim 2 or the switching power supply transformer according to claim 3 can be used in an advantageous manner, even with the door open for an undesired modulation of the control circuit of the magnetron switched-mode power supply, it is certainly not sufficient to maintain the secondary voltage and to use this according to claim 4 in a standby mode of the separate power supply for the power supply of the timer, the metering and cooking time control and, if necessary, the clock.
  • the secondary voltage of the switching power supply provided for the separate power supply unit is available unchanged at any time.
  • the design of the separate power supply unit as a switched-mode power supply also offers the possibility, by appropriate selection of the switching frequency of this power supply unit and the material of the core of its transformer, for effectively bridging the legs of the first core part from the outside with ordinary, magnetically conductive objects that occur in the household when the loading door is open to be excluded additionally.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Electric Ovens (AREA)
EP90109007A 1989-05-12 1990-05-14 Surveillance électronique de porte pour fours à micro-ondes Expired - Lifetime EP0397209B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3915541 1989-05-12
DE3915541A DE3915541C2 (de) 1989-05-12 1989-05-12 Anordnung zur elektronischen Türüberwachung eines Mikrowellenherdes

Publications (3)

Publication Number Publication Date
EP0397209A2 true EP0397209A2 (fr) 1990-11-14
EP0397209A3 EP0397209A3 (fr) 1992-03-04
EP0397209B1 EP0397209B1 (fr) 1993-08-11

Family

ID=6380525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109007A Expired - Lifetime EP0397209B1 (fr) 1989-05-12 1990-05-14 Surveillance électronique de porte pour fours à micro-ondes

Country Status (2)

Country Link
EP (1) EP0397209B1 (fr)
DE (2) DE3915541C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550897A2 (fr) * 1991-12-31 1993-07-14 Daewoo Electronics Co., Ltd Circuit de sécurité pour la porte d'un four à micro-ondes
US7009147B1 (en) 2005-01-12 2006-03-07 Maytag Corporation Operational modes for a cooking appliance employing combination cooking technology

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918297A1 (de) * 1989-06-05 1990-12-06 Vogt Electronic Ag Sicherheitsschalter fuer microwellenherde

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816688A (en) * 1972-04-03 1974-06-11 Amana Refrigeration Inc Safety interlock system for microwave ovens
DE3236290A1 (de) * 1982-09-30 1984-04-05 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Vorrichtung zum ueberwachen des schliesszustandes von tueren an mikrowellenoefen
EP0247668A1 (fr) * 1986-05-23 1987-12-02 Laboratoires D'electronique Philips Four à micro-ondes comportant un dispositif de sécurité de fermeture de porte
GB2200748A (en) * 1987-01-16 1988-08-10 Europ Microwaves Limited Door alarm system
DE3840650A1 (de) * 1988-12-02 1990-06-07 Vogt Electronic Ag Elektronische tuersicherung fuer mikrowellengeraete

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188798B (en) * 1986-03-20 1990-04-04 Sanyo Electric Co Power controller for an electrical load

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816688A (en) * 1972-04-03 1974-06-11 Amana Refrigeration Inc Safety interlock system for microwave ovens
DE3236290A1 (de) * 1982-09-30 1984-04-05 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Vorrichtung zum ueberwachen des schliesszustandes von tueren an mikrowellenoefen
EP0247668A1 (fr) * 1986-05-23 1987-12-02 Laboratoires D'electronique Philips Four à micro-ondes comportant un dispositif de sécurité de fermeture de porte
GB2200748A (en) * 1987-01-16 1988-08-10 Europ Microwaves Limited Door alarm system
DE3840650A1 (de) * 1988-12-02 1990-06-07 Vogt Electronic Ag Elektronische tuersicherung fuer mikrowellengeraete

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550897A2 (fr) * 1991-12-31 1993-07-14 Daewoo Electronics Co., Ltd Circuit de sécurité pour la porte d'un four à micro-ondes
EP0550897A3 (en) * 1991-12-31 1993-09-29 Daewoo Electronics Co., Ltd Microwave oven door control device
US7009147B1 (en) 2005-01-12 2006-03-07 Maytag Corporation Operational modes for a cooking appliance employing combination cooking technology

Also Published As

Publication number Publication date
DE3915541A1 (de) 1990-11-15
EP0397209A3 (fr) 1992-03-04
DE59002257D1 (de) 1993-09-16
EP0397209B1 (fr) 1993-08-11
DE3915541C2 (de) 1994-02-03

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