Power converter having phase lock circuit for quasi-resonant...

Details Power converter having phase lock circuit for quasi-resonant... Power converter having phase lock circuit for quasi-resonant...

2005-11-16

2008-12-16

Nguyen, Matthew V (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021150

Reexamination Certificate

active

07466569

ABSTRACT:
The present invention provides a power converter having a phase lock circuit for quasi-resonant soft switching. The power converter includes a first circuit coupled to the feedback signal to generate a switching signal for switching a switching device and regulating the output of the power converter. A second circuit is coupled to an auxiliary winding of the transformer for generating a voltage signal in response to the voltage of the transformer. A phase lock circuit generates a control signal to enable the switching signal in accordance with the voltage signal. The switching signal further turns on the switching device in response to a valley voltage across the switching device.

REFERENCES:
patent: 4535399 (1985-08-01), Szepesi
patent: 5602465 (1997-02-01), Clemente
patent: 6476589 (2002-11-01), Umminger et al.
patent: 7054170 (2006-05-01), Yang et al.

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