PFC pre-regulator frequency dithering circuit

Details PFC pre-regulator frequency dithering circuit PFC pre-regulator frequency dithering circuit

2007-03-27

2007-03-27

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C323S300000, C323S303000

Reexamination Certificate

active

11210032

ABSTRACT:
A circuit and method of dithering the switching frequency of an off-line power factor corrected (PFC) pre-regulator. The circuitry used to dither the frequency is advantageously accomplished by taking advantage of the PWM's internal timing circuitry. This invention reduces narrow band EMI and eliminates the need to provide specialty PWM controllers to achieve dithering.

REFERENCES:
patent: 4858052 (1989-08-01), McDonnal
patent: 5268832 (1993-12-01), Kandatsu
patent: 5327071 (1994-07-01), Frederick et al.
patent: 5396165 (1995-03-01), Hwang et al.
patent: 5892354 (1999-04-01), Nagao et al.
patent: 5982151 (1999-11-01), Nagai et al.
patent: 6778416 (2004-08-01), Bruno
patent: 7012413 (2006-03-01), Ye

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