Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2005-01-11
2005-01-11
Vu, Bao Q. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S056010, C363S021120
Reexamination Certificate
active
06842350
ABSTRACT:
A dc-to-dc converter includes a transformer having a primary winding connected to an input rectifying and smoothing circuit via an FET or like switching device, and a secondary winding connected to an output rectifying and smoothing circuit. A resonance capacitor is connected in parallel with the switching device. A switch control circuit cyclically turns the switching device on and off so as to keep constant the output voltage of the output rectifying and smoothing circuit by feedback control. The switch control circuit drives the switching device in light load mode when a flyback voltage developed by the transformer terminates earlier than each clock pulse, and in heavy load mode, in which each on-off cycle of the switching device is longer than in the light load mode, when the flyback voltage terminates later than each clock pulse.
REFERENCES:
patent: 6038146 (2000-03-01), Luo et al.
patent: 6515876 (2003-02-01), Koike et al.
patent: 6751104 (2004-06-01), Qiao et al.
patent: 09-140128 (1997-05-01), None
Simada Masaaki
Yamada Tomoyasu
Sanken Electric Co. Ltd.
Vu Bao Q.
Woodcock & Washburn LLP
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