Switching power supply device

Details Switching power supply device Switching power supply device

2008-01-01

2008-01-01

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S015000

Reexamination Certificate

active

07315460

ABSTRACT:
A series circuit in which a first switching element and a second switching element are connected in series at both ends of an output of an input rectifier circuit for rectifying an alternating current of an alternating current power supply, a resonant circuit in which a primary winding of a transformer and a current resonant capacitor are connected in series at both ends of the first switching element or the second switching element, a rectifying and smoothing circuit for rectifying and smoothing a voltage generated across a secondary winding of the transformer during an on-period of the first switching element or the second switching element, a control circuit for alternately turning on/off the first switching element and the second switching based on a voltage from the rectifying and smoothing circuit, and a voltage detecting circuit for outputting a voltage detecting signal when a voltage at both ends of one switching element of the first switching element and the second switching element, which is turned on at a time of transmitting electric power to the rectifying and smoothing circuit, becomes equal to a predetermined voltage or more. The control circuit turns on the other switching element of the first switching element and the second switching element based on the voltage detecting signal from the voltage detecting circuit.

REFERENCES:
patent: 4692851 (1987-09-01), Attwood
patent: 6418038 (2002-07-01), Takahama et al.
patent: 7212415 (2007-05-01), Osaka
patent: 7242595 (2007-07-01), Yasumura
patent: 2006/0098464 (2006-05-01), Osaka et al.
patent: 2006/0291117 (2006-12-01), Kyono
patent: 2005-51918 (2005-02-01), None
U.S. Appl. No. 11/610,626, filed Dec. 14, 2006, Kyono.
U.S. Appl. No. 11/621,284, filed Jan. 9, 2007, Kyono.

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