Power factor correction circuit

Details Power factor correction circuit Power factor correction circuit

1999-06-08

2000-08-22

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 89, 363126, H02M 112

Patent

active

061082228

ABSTRACT:
A power factor correction circuit includes a series connection of a bridge rectifier, a first winding, a diode, and an electrolytic capacitor, a series connection of the electrolytic capacitor, a second winding, and a DC/DC converter, and a common core wound round by the first winding and the second winding. The diode is able to switch between a reverse bias and a forward bias by controlling the polarities of the windings such that an input current always flows to the electrolytic capacitor during each sinusoidal period of an ac voltage. Further, a dc ripple voltage of the electrolytic capacitor will not rise, and an output of the DC/DC converter will not be adversely affected by the 120 Hz ac voltage input. By utilizing this circuit, the power factor of a conventional switching power supply is significantly improved.

REFERENCES:
patent: 5757626 (1998-05-01), Jovanovic' et al.
patent: 5909107 (1999-06-01), Aonuma

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