Soft-switching power converter having power saving circuit...

Details Soft-switching power converter having power saving circuit... Soft-switching power converter having power saving circuit...

2007-10-23

2007-10-23

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S021150, C363S021180

Reexamination Certificate

active

11285964

ABSTRACT:
A soft switching power converter includes a first switch for switching a transformer to transfer energy. A second switch is equipped to switch energy in a capacitor to the transformer to achieve soft switching for the next switching cycle. A control circuit is coupled to an output of the power converter for generating a first signal and a second signal in response to a feedback signal for regulating the output of the power converter. A first delay time is generated after the first switch is turned off and before the second signal is on. A second delay time is generated after the second switch is turned off and before the first signal is on. The second delay time is increased corresponding to a decrement of the feedback signal under light load conditions.

REFERENCES:
patent: 4855888 (1989-08-01), Henze et al.
patent: 5442542 (1995-08-01), Cook
patent: 5973939 (1999-10-01), Tan
patent: 6069798 (2000-05-01), Liu
patent: 6191960 (2001-02-01), Fraidlin et al.
patent: 6631082 (2003-10-01), Birumachi

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