Power supply system having improved input power factor

Details Power supply system having improved input power factor Power supply system having improved input power factor

1987-10-20

1989-05-16

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 48, 363 89, 363126, H02M 170

Patent

active

048315087

ABSTRACT:
A circuit and method using a low frequency active switch for improving input power factor in power supplies utilizing a full wave rectifier and capacitor filter for supplying a filtered DC voltage from an AC power source. A switch control activates and deactivates an active switching once in each half cycle of the alternating voltage input. The switch control is connected to the active switching for operating the circuit providing high power factor.

REFERENCES:
patent: 4074344 (1978-02-01), Pitel
patent: 4222096 (1980-09-01), Capewell
patent: 4340931 (1982-07-01), Endo et al.
patent: 4369490 (1983-01-01), Blum
patent: 4683529 (1987-07-01), Bucher, II

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