Power source circuit for microwave oven

Details Power source circuit for microwave oven Power source circuit for microwave oven

1991-03-25

1993-11-02

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

H05B 668

Patent

active

052585956

ABSTRACT:
A power source circuit for a microwave oven is provided with first and second door switches that are opened by opening the door of the microwave heating chamber and a third door switch having a movable contact that is converted to first and second fixed contacts in response to closing and opening the door respectively. The circuit insures safe cut off of the microwave magnetron even if the first door switch does not open upon opening the door and also in the event of grounding of the primary of a high voltage transformer.

REFERENCES:
patent: 3746938 (1973-07-01), Lamb
patent: 4117294 (1978-09-01), Appelquist et al.
patent: 4278862 (1981-07-01), Mizuno et al.
patent: 4323747 (1982-04-01), Takase et al.
patent: 4461940 (1984-07-01), Ishimura
patent: 4542269 (1985-09-01), Sakoda

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