Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-08-28
2007-08-28
Laxton, Gary L (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021140
Reexamination Certificate
active
11614474
ABSTRACT:
A switching-mode power supply capable of causing conduction through a synchronous rectifier switch exactly when required. Included is a transformer having a primary winding connected to a pair of DC input terminals via an active switch, and a secondary winding connected to a pair of DC output terminals via a synchronous rectifier and a smoothing capacitor. The synchronous rectifier is a parallel connection of a synchronous rectifier switch and a diode. In order to cause conduction through the synchronous rectifier switch while the diode is conducting, there is provided a synchronous rectifier control circuit comprising two current sources, a conduction period determination circuit, and a synchronous rectifier switch control pulse forming circuit.
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Laxton Gary L
Sanken Electric Co. Ltd.
Woodcock Wasburn LLP
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