Switching power supply device

Details Switching power supply device Switching power supply device

2006-03-14

2006-03-14

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021040, C363S065000, C363S089000

Reexamination Certificate

active

07012818

ABSTRACT:
In a switching power supply device, the operating voltage is supplied to the power-factor improvement control circuit when the switching power supply device is operating under normal operating load. Thereby, the booster chopper circuit is controlled by the power-factor improvement control circuit so as to improve the power factor of the device. By contrast, during the non-oscillation period while the switching control circuit is in the intermittent oscillation mode when the power consumption is small, the voltage induced in the auxiliary winding drops. Accordingly, the voltage of the auxiliary power supply also drops. Furthermore, when the driving voltage to be supplied to the power-factor improvement control circuit is reduced below the operating voltage thereof by the voltage reduction circuit, the power-factor improvement control circuit stops functioning, thereby reducing power consumption accordingly.

REFERENCES:
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patent: 5909360 (1999-06-01), Lavin et al.
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patent: 6172885 (2001-01-01), Feldtkeller
patent: 6344986 (2002-02-01), Jain et al.
patent: 6504497 (2003-01-01), Jang et al.
patent: 6714425 (2004-03-01), Yamada et al.
patent: 6775156 (2004-08-01), Lin et al.
patent: 2001-095236 (2001-04-01), None

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