Switching power supply and regulation circuit

Details Switching power supply and regulation circuit Switching power supply and regulation circuit

2008-05-29

2010-06-01

Vu, Bao Q (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021170, C363S021180

Reexamination Certificate

active

07729137

ABSTRACT:
The present invention provides a switching power supply that enables a reduction in noise without the need for an anti-noise component such as a filter circuit. A secondary current on period detecting circuit detects a first period during which a secondary current flows, the secondary current starting to flow through a secondary winding after a switching element is turned off. A secondary current on duty control circuit oscillates a clock signal set turning on the switching element so as to maintain, at a constant value, an on duty ratio of the first period to a third period made up of the first period and a second period during which the secondary current does not flow. A secondary current on duty modulating circuit applies a modulation component to the on duty ratio to periodically modulate the on duty ratio and thus the oscillation frequency of the switching element.

REFERENCES:
patent: 2003/0038669 (2003-02-01), Zhang
patent: 2007/0132438 (2007-06-01), Jang et al.
patent: 2007/0182387 (2007-08-01), Weirich
patent: 2008/0084197 (2008-04-01), Williams et al.
patent: 1 211 794 (2001-12-01), None

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