Switching power source apparatus

Details Switching power source apparatus Switching power source apparatus

2008-04-01

2008-04-01

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S089000

Reexamination Certificate

active

11092391

ABSTRACT:
A power-factor improving circuit applicable to a switching power source apparatus includes a rectifier having a diode bridge, a step-up reactor, a switching element, an output diode, a smoothing capacitor, a controller, and a variable reference voltage generator. If an error voltage from a conductance amplifier exceeds a second reference voltage, a comparator provides a high-level switching signal to turn on a switching element and bypass a resistor. As a result, a first reference voltage supplied to the conductance amplifier is switched from a low reference voltage to a high reference voltage. This results in adjusting an output voltage (Vout) to a low value.

REFERENCES:
patent: 5617305 (1997-04-01), Numata
patent: 5959857 (1999-09-01), Nagahara
patent: 5973946 (1999-10-01), Yasumura
patent: 6314005 (2001-11-01), Nishi et al.
patent: 6373735 (2002-04-01), Usui
patent: 6882551 (2005-04-01), Shimada et al.
patent: 7176660 (2007-02-01), Usui et al.
patent: 06-233524 (1994-08-01), None
patent: WO03/047080 (2003-06-01), None

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