D.C. Power supply

Details D.C. Power supply D.C. Power supply

1980-07-17

1982-03-09

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 37, 363 79, H02M 700

Patent

active

043193170

ABSTRACT:
A d.c. power supply for use in microwave ovens in which an a.c. voltage having a commercial frequency is rectified and then is chopped at a high frequency by means of a switching element. The resultant voltage is smoothed before being applied to the microwave oven. The voltage level of the commercial frequency voltage is sensed to produce a control pulse the duty ratio of which becomes greater as the voltage level becomes lower. The control pulse is used to control the ON-OFF operation of the switching element. By this circuit configuration, the microwave oven is supplied with a continuously-controllable d.c. voltage having a flat waveform.

REFERENCES:
patent: 3855518 (1974-12-01), Genuit
patent: 4037271 (1977-07-01), Keller
patent: 4122516 (1978-10-01), Tokunaga

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