Timer operated control circuit for a microwave oven

Details Timer operated control circuit for a microwave oven Timer operated control circuit for a microwave oven

1976-04-08

1978-05-09

Truhe, J. V.

Electric heating

Metal heating

Of cylinders

307141, H05B 906

Patent

active

040888622

ABSTRACT:
A control circuit for a microwave oven including a main timer for setting the period of operation and having a high power mode in which power is continuously supplied to the microwave generator for the entire timed period, and a defrost or low power mode wherein power is supplied at a reduced duty cycle for the selected time period. The circuit, in addition to the main timer operable in both modes, includes a defrost timer operable only in the defrost mode for periodically interrupting the power circuit for the microwave generator thereby to provide reduced duty cycle operation. The circuit further includes means for automatically resetting the defrost timer after operation thereof to assure that the microwave generator will be instantly energized upon subsequent operation, independently of the subsequently selected mode.

REFERENCES:
patent: 3694608 (1972-09-01), Loubert et al.
patent: 3824365 (1974-07-01), Tapper
patent: 3842233 (1974-10-01), Lamb
patent: 3943317 (1976-03-01), Nagamoto

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