High efficiency, low voltage adapter apparatus and method

Details High efficiency, low voltage adapter apparatus and method High efficiency, low voltage adapter apparatus and method

1994-10-05

1995-10-31

Wong, Peter S.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

323237, G05F 502

Patent

active

054633079

ABSTRACT:
A circuit can control the power to a load having a predetermined voltage rating. The circuit includes a first terminal adapted to connect to the load and a second terminal adapted to be connected through a power switch to an alternating voltage source. This voltage source has a magnitude rated substantially in excess of the predetermined voltage rating. A switching device is serially connected between the first and second terminal. Also, a capacitive filter circuit has dual terminals separately connected to the first and second terminals. This filter can shunt from the switch transient currents flowing through the load. A timing circuit is coupled to the switching device for periodically operating it at a frequency proportional to that of the alternating voltage source. The switching device is timed by the timing circuit to keep the magnitude of average voltage to the load less than that of the alternating voltage source, for each half cycle of the alternating voltage source.

REFERENCES:
patent: 3548290 (1970-12-01), Swinehart
patent: 3742337 (1973-06-01), Dignette
patent: 3942086 (1976-03-01), Bresler
patent: 4634957 (1987-01-01), Hollaway
patent: 4783729 (1988-11-01), Konopka
patent: 4878010 (1989-10-01), Weber
patent: 4924109 (1990-05-01), Weber
patent: 4965509 (1990-10-01), Oldham
patent: 5036234 (1991-07-01), Friedrich et al.

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