Digital control of bridgeless power factor correction circuit

Details Digital control of bridgeless power factor correction circuit Digital control of bridgeless power factor correction circuit

2007-07-31

2007-07-31

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

For reactive power control

Using converter

C363S127000

Reexamination Certificate

active

11267516

ABSTRACT:
A circuit for providing power factor correction includes a bridgeless boost converter circuit and a control circuit receiving an input AC line voltage of the bridgeless boost converter circuit, wherein the control circuit provides a pulse width modulated signal to control the on time of a PFC switch of the bridgeless boost converter circuit. The control circuit also includes a scaling device operable to scale down a bi-polar AC voltage of the input AC line voltage to a uni-polar AC voltage, an analog to digital converter operable to convert the uni-polar AC voltage into digital data and a digital rectifier operable to process the digital data of the uni-polar AC voltage to provide a half-sinusoidal AC signal that is proportional to and in phase with the input AC line voltage for use in providing the pulse width modulated signal.

REFERENCES:
patent: 6215287 (2001-04-01), Matsushiro et al.
patent: 6738274 (2004-05-01), Prasad et al.
patent: 7088081 (2006-08-01), Takahashi et al.
International Search Report dated Oct. 10, 2006.

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