Power factor correction circuit

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

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363126, H02M 112

Patent

active

048558907

ABSTRACT:
A power factor correction circuit for an off line supply of the switch mode type. In its simplest form the circuit is made up of a capacitor and an inductor. The capacitor is to be connected to the input rectifier of the supply. The capacitor is in aiding relationship for each half cycle of the line voltage. When so connected, a unidirectional current flows from the rectifier to charge the bank capacitors of the supply. The inductor is to be connected to at least the rectifier. The inductor causes the amplitude of the unidirectional current to increase and decrease at a rate which is less than it would be if the inductor was not so connected.
Embodiments having at least two capacitors which are controlled to be switched in and out of the correction circuit as well as one or more inductors which may or may not be controlled are also disclosed.

REFERENCES:
patent: 3365657 (1968-01-01), Webb
patent: 4074344 (1978-02-01), Pitel
patent: 4193111 (1980-03-01), Wester
patent: 4222096 (1980-09-01), Capewell
patent: 4384321 (1983-05-01), Rippel
patent: 4412277 (1983-10-01), Mitchell
patent: 4437146 (1984-03-01), Carpenter
Steve Smith, "Power Factor Correction I, II, III", Jan. Feb. and Mar. 1987.
California Institute of Technology, Power Electronics Group, "Input-Current Shaped AC-to-DC Converters", May 1986.

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