Power supply circuit of a microwave oven

Details Power supply circuit of a microwave oven Power supply circuit of a microwave oven

1998-02-24

1999-07-27

Walberg, Teresa

Electric heating

Microwave heating

With control system

H05B 668

Patent

active

059285524

ABSTRACT:
A power supply circuit of a microwave oven includes a door switch connected between an AC power supply and a magnetron driving circuit for switching in accordance with a door opening/closing operation, and a power supply control switch connected between the AC power supply and door switch for switching by a power supply command. Also included as parts are a current limit resistor connected between the door switch and magnetron driving circuit, and a relay having a contact point connected in parallel with the current limit resistor to be driven by a low AC voltage supplied from a motor driven by being supplied with the AC power supply when the door switch is on. By using the low AC voltage relay with the small number of coil turns the relay manufacturing time is shortened while improving reliability.

REFERENCES:
patent: 4115679 (1978-09-01), Moore
patent: 4321447 (1982-03-01), Lamb et al.
patent: 4430540 (1984-02-01), Scalf et al.
patent: 4533810 (1985-08-01), Harmon et al.
patent: 4556773 (1985-12-01), Yoshiyuki et al.
patent: 4724291 (1988-02-01), Inumada
patent: 4772808 (1988-09-01), Vial

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