Switching power supply device

Details Switching power supply device Switching power supply device

2008-11-25

2010-12-28

Vu, Bao Q (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021170, C363S021010, C363S021180

Reexamination Certificate

active

07859864

ABSTRACT:
A switching power supply device has lower correction circuit losses, and enables adjustments without affecting overcurrent limiting or other characteristics. An integrated circuit IC for power supply control generates a switching signal based on a feedback signal from a feedback circuit and a voltage signal from a current detection input terminal, and outputs the switching signal from an output terminal to a switching element. A voltage controlled oscillator is provided which, when the load is judged to be light based on the magnitude of the feedback signal, lowers the switching frequency. The correction circuit is connected between the output terminal of the integrated circuit and the signal input terminal for current detection, acts only when the switching element is on, and has the function of further lowering the switching frequency set in the integrated circuit.

REFERENCES:
patent: 6456511 (2002-09-01), Wong
patent: 7184279 (2007-02-01), Lee
patent: 2007/0274107 (2007-11-01), Garner et al.
patent: 2008/0031017 (2008-02-01), Ng et al.
patent: 2008/0112193 (2008-05-01), Yan et al.
patent: 2008/0259652 (2008-10-01), Huynh et al.
patent: 2008/0259654 (2008-10-01), Huynh et al.
patent: 2003-299351 (2003-10-01), None
patent: 2007-215316 (2007-08-01), None

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