Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2011-07-12
2011-07-12
Nguyen, Matthew V (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021120
Reexamination Certificate
active
07978484
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: 7724548 (2010-05-01), Jones et al.
patent: 7746673 (2010-06-01), Grant et al.
patent: 2009/0207636 (2009-08-01), Huynh et al.
Grant Matthew A.
Tao Zhibo
Active-Semi, Inc.
Imperium Patent Works
Nguyen Matthew V
Wallace Darien K.
Wallace T. Lester
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