Flyback constant voltage converter having both a PWFM mode...

Details Flyback constant voltage converter having both a PWFM mode... Flyback constant voltage converter having both a PWFM mode...

2008-05-10

2010-06-29

Nguyen, Matthew V (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021120

Reexamination Certificate

active

07746673

ABSTRACT:
A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is regulated using both pulse width modulation and pulse frequency modulation. Both types of modulation are used simultaneously. In a second sub-mode (“low output power sub-mode”), VOUT is regulated using pulse width modulation, but the converter switching frequency is fixed at a first frequency. By setting the first frequency at a frequency above the frequency limit of human hearing, an undesirable audible transformer humming that might otherwise occur is avoided. In some embodiments, the converter has a third sub-mode (“high output power sub-mode”), in which pulse width modulation is used but the switching frequency is fixed at a second frequency. By proper setting of the second frequency, undesirable EMI radiation and other problems that might otherwise occur are avoided.

REFERENCES:
patent: 5057986 (1991-10-01), Henze et al.
patent: 7531970 (2009-05-01), Yu et al.
patent: 2009/0207636 (2009-08-01), Huynh et al.

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