Voltage conversion circuit and switching power supply device

Details Voltage conversion circuit and switching power supply device Voltage conversion circuit and switching power supply device

2006-06-08

2008-09-09

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021060, C363S049000, C323S901000

Reexamination Certificate

active

07423888

ABSTRACT:
A voltage conversion circuit and a switching power supply device achieving both a good response and a low loss of a power supply voltage, wherein a main voltage conversion portion (circuit block) for conversion an AC voltage to a DC voltage, an auxiliary voltage conversion portion for the same conversion but in transit period up to shifting to a stationary state, a voltage limiting portion (Zener diode) for limiting the DC voltage output from the auxiliary voltage conversion portion to a constant limit-voltage, and an output control switch (transistor) connected in the output pass and for switching the pass to conductive or nonconductive possible to apply a higher voltage in between a voltage at the output node and the limit-voltage based on their magnitude relation.

REFERENCES:
patent: 6295213 (2001-09-01), Smith
patent: 6519164 (2003-02-01), Weng et al.
patent: 6650560 (2003-11-01), MacDonald et al.
patent: 7218081 (2007-05-01), Jang et al.
patent: 7251146 (2007-07-01), Aso
patent: 2005/0162140 (2005-07-01), Hirst

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