Switching power supply

Details Switching power supply Switching power supply

2008-03-04

2008-03-04

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S016000, C363S098000

Reexamination Certificate

active

07339799

ABSTRACT:
A switching power supply includes a first series circuit formed by connecting first and second switching elements in series at both ends of a direct-current power source, a second series circuit formed by connecting a resonant capacitor, a resonant reactor, and a primary winding of a transformer in series at both ends of the switching element, a rectifying-smoothing circuit configured to rectify and smooth a voltage generated on a secondary winding of the transformer, and a control circuit configured to turn the first and second switching elements and on and off alternately based on an output voltage from the rectifying-smoothing circuit. Here, the control circuit sets an on-period of the second switching element to a predetermined time period longer than a half value of a cycle of a resonant current attributable to the resonant reactor and the resonant capacitor, and controls an on-period of the first switching element based on the output voltage from the rectifying-smoothing circuit.

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patent: 6788556 (2004-09-01), Hosotani et al.
patent: 2006/0098464 (2006-05-01), Osaka et al.
patent: 2003-9525 (2003-01-01), 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.
U.S. Appl. No. 11/417,153, filed May 4, 2006, Kyono.

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