Microwave oven power control circuit

Details Microwave oven power control circuit Microwave oven power control circuit

1975-08-28

1977-08-09

Hickey, Robert J.

Electric heating

Metal heating

Of cylinders

323 24, H05B 906

Patent

active

040412679

ABSTRACT:
An electronic triggering circuit is disclosed for developing a periodic control signal having a variable duty cycle. The periodic control signal is developed in synchronization with an applied alternating line voltage and is utilized for rendering a semiconductor switch conductive and nonconductive in timed relationship to the negative half cycle of the applied line voltage. The semiconductor switch is interposed between the line voltage and a load, which may be the power supply for a microwave oven, such that as the duty cycle of the control signal is varied the microwave power supplied to the oven is also varied. By rendering the semiconductor switch operative in timed relationship to the line voltage transients are minimized therethrough.

REFERENCES:
patent: 3780252 (1973-12-01), Crapuchettes
patent: 3862390 (1975-01-01), Noda
patent: 3943317 (1976-03-01), Nagamoto

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