Line voltage sensing for microwave ovens

Details Line voltage sensing for microwave ovens Line voltage sensing for microwave ovens

1990-09-04

1993-05-18

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1055R, 219 1055F, 219 1055C, 323205, 323211, 363142, H05B 668

Patent

active

052123600

ABSTRACT:
A microwave oven with a power supply including a transformer having primary and secondary windings, with the primary winding having a plurality of input connections and a secondary winding being coupled to a magnetron. The microwave oven includes a circuit the magnitude of a line voltage supplied to the microwave oven and, in response thereto, for coupling the line voltage to a corresponding one of the input connections to regulate the voltage provided across the secondary winding to the same voltage level regardless of the magnitude of the line voltage.

REFERENCES:
patent: 4415964 (1983-11-01), Scharfe, Jr.
patent: 4428015 (1984-01-01), Nesler
patent: 4539453 (1985-09-01), Miyazaki et al.
patent: 4656571 (1987-04-01), Umezu
patent: 4900884 (1990-02-01), Aoki
patent: 4939330 (1990-07-01), Berggren et al.

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