Single stage PFC and power converter circuit

Details Single stage PFC and power converter circuit Single stage PFC and power converter circuit

2005-08-05

2009-06-30

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S246000, C315S224000, C315S291000, C315S2090SC

Reexamination Certificate

active

07554271

ABSTRACT:
A power converter provides constant load power while achieving a high power factor in a single stage configuration with reduced component count and ratings. The power converter takes a rectified line input to a switching half-bridge that supplies current to a load. A series combination of shunt switch and capacitor is connected across the load to store energy from the input and supply energy to the load. The switches are operated with conduction angles that achieve constant power supplied to the load while drawing a sinusoidal current in phase with the input voltage to achieve high power factor. The circuit provides a simplified configuration over prior power converters that may be used with a resonant load as part of an electronic ballast or an AC-to-DC converter. The power converter configuration and operation also achieves a low total harmonic distortion on the input line power.

REFERENCES:
patent: 5493182 (1996-02-01), Sowa et al.
patent: 6674248 (2004-01-01), Newman et al.
patent: 7061189 (2006-06-01), Newman et al.
patent: 2003/0048643 (2003-03-01), Lin et al.

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