Primary-side feedback switching power supply

Details Primary-side feedback switching power supply Primary-side feedback switching power supply

2007-07-03

2007-07-03

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021160, C363S021180

Reexamination Certificate

active

11645772

ABSTRACT:
The present invention discloses a primary-side feedback switching power supply that uses a sample-and-hold circuit to obtain a corner voltage of a harmonic wave voltage while the primary-side auxiliary winding is operating at a discontinuous mode as a feedback control, and provides both voltage regulation and current limit functions. A stable voltage output is provided within the nominal input voltage and nominal output load, such that when the output reaches a current limit, the output voltage drops but the output current is controlled to remain unchanged, so as to provide an over-current protection.

REFERENCES:
patent: 5745358 (1998-04-01), Faulk
patent: 5841641 (1998-11-01), Faulk
patent: 6101105 (2000-08-01), Gilmore
patent: 6853563 (2005-02-01), Yang et al.
patent: 7027313 (2006-04-01), Amei

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