Switching controller having programmable feedback circuit...

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

Reexamination Certificate

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Details

C323S224000, C363S098000

Reexamination Certificate

active

07999527

ABSTRACT:
A switching controller for a boost power converter includes a switching-control circuit and a programmable feedback circuit. The programmable feedback circuit is coupled to an output of the boost power converter via a voltage divider. The programmable feedback circuit includes a current source coupled to a switch. On a light-load condition, a power-saving signal turns on the switch. The switch will conduct a programming current supplied by the current source toward the voltage divider. Furthermore, the voltage divider is externally adjustable for programming a determined level of an output voltage of the boost power converter on the light-load condition. Additionally the present invention increases system design flexibility to meet practical power-saving requirements without adding circuitries and increasing cost.

REFERENCES:
patent: 5773966 (1998-06-01), Steigerwald
patent: 6127815 (2000-10-01), Wilcox
patent: 6469914 (2002-10-01), Hwang et al.
patent: 6724174 (2004-04-01), Esteves et al.
patent: 7482788 (2009-01-01), Yang
patent: 7498788 (2009-03-01), Yang

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