Light-load efficiency improving method and apparatus for a...

Details Light-load efficiency improving method and apparatus for a... Light-load efficiency improving method and apparatus for a...

2007-08-03

2009-10-27

Patel, Rajnikant B (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S097000

Reexamination Certificate

active

07609533

ABSTRACT:
A flyback converter has a controller to switch a power switch so as to convert an input voltage to an output voltage for a load by monitoring an output voltage dependent signal and a current sensing signal derived from a current flowing through the power switch, a light-load efficiency improving apparatus monitors the load and a supply voltage provided for the controller to selectively clamp the output voltage dependent signal when the load is lower than a first threshold value and the supply voltage is lower than a second threshold value, so as to increase the supply voltage.

REFERENCES:
patent: 4757433 (1988-07-01), Santelmann, Jr.
patent: 5982639 (1999-11-01), Balakirshnan
patent: 6137696 (2000-10-01), Hall et al.
patent: 6356466 (2002-03-01), Smidt et al.
patent: 6845019 (2005-01-01), Kim et al.
patent: 6961253 (2005-11-01), Cohen

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