Switching power supply device

Details Switching power supply device Switching power supply device

2005-04-19

2005-04-19

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S089000

Reexamination Certificate

active

06882551

ABSTRACT:
A switching power supply such that the step-up ratio of when the power-factor is improved does not increase, and the conversion efficiency can be improved. In a case where the error voltage Ver outputted from a conductance amplifier (23) increases over a reference voltage Vref2, a switching signal of high level is outputted from a comparator (59) to a FET (57) to turn on the FET (57). Therefore a resistor (56) is bypassed, and as a result a reference voltage Vref1inputted into the conductance amplifier (23) is changed from a reference voltage Vref1-1to Vref1-2of lower level. Further, since the variation of the error voltage Ver outputted from the conductance amplifier (23) decreases, the output voltage Vout also decreases.

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: 0 838 893 (1998-04-01), None
patent: 05-111246 (1993-04-01), None
patent: 2000-341936 (2000-12-01), None
patent: 2001-086737 (2001-03-01), None
patent: 2001-119940 (2001-04-01), None

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