Synchronous rectifying switching power source circuit

Details Synchronous rectifying switching power source circuit Synchronous rectifying switching power source circuit

2006-10-17

2006-10-17

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

Reexamination Certificate

active

07123490

ABSTRACT:
In a synchronous rectification switching power supply circuit, a primary winding of a transformer and a main switching device are serially connected to a direct current input power supply. A secondary winding and a synchronous rectification device on the secondary side are serially connected between output terminals. A power supply apparatus has a capacitor charged with a voltage across the winding on the secondary side of the transformer by turning the main switching device on and off. An electronic instrument, to which the power supply apparatus is connected, has a control IC which sends a control signal to the gate terminal of the synchronous rectification device. When the synchronous rectification device is turned on, the output capacitor is charged and the direct current input power supply recovers power from the output capacitor through the transformer, thereby supplying output electric power set by the control IC to the electronic instrument.

REFERENCES:
patent: 5768118 (1998-06-01), Faulk et al.
patent: 6069804 (2000-05-01), Ingman et al.
patent: 6169683 (2001-01-01), Farrington
patent: 6246593 (2001-06-01), Cheng
patent: 6396333 (2002-05-01), Dubhashi et al.
patent: WO-03/094331 (2003-11-01), None
European Search Report for EP 05 25 4959 completed Nov. 9, 2005.
Patent Abstracts of Japan for 2000-350454 published on Dec. 15, 2000.

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