Switching power supply and ZVS method thereof

Details Switching power supply and ZVS method thereof Switching power supply and ZVS method thereof

2006-09-21

2008-11-11

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021110

Reexamination Certificate

active

07450404

ABSTRACT:
The provided switching power supply includes an auxiliary circuit having an auxiliary switch and a auxiliary capacitor, a transformer having a primary side coupled to the auxiliary circuit in parallel and a secondary side, an auxiliary switch control circuit coupled to the auxiliary switch and the primary side and fixing a turn-on time of the auxiliary switch, a main switch coupled to the primary side, a ZVS detector coupled to the main switch, a first and a second rectifying switches coupled to the secondary side and a filter circuit coupled to the second rectifying switch in parallel. The provided method includes the steps of: (a) fixing the turn-on time of the auxiliary switch; and (b) generating a fixed turn-off time of the main switch accordingly so as to accomplish ZVS of the main switch.

REFERENCES:
patent: 5430633 (1995-07-01), Smith
patent: 5644479 (1997-07-01), Yoshida et al.
patent: 6366476 (2002-04-01), Yasumura
patent: 2006/0158908 (2006-07-01), Usui

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