Power supply apparatus including charge-pump type step-up...

Details Power supply apparatus including charge-pump type step-up... Power supply apparatus including charge-pump type step-up...

2008-01-29

2008-01-29

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With voltage multiplication means

C327S536000

Reexamination Certificate

active

07324358

ABSTRACT:
In a power supply apparatus including a charge-pump type step-up circuit adapted to carry out a stand-by operation to charge a step-up capacitor by a power supply voltage, and carry out a step-up operation to step up a charged voltage of the step-up capacitor and discharge a stepped-up charged voltage of the step-up capacitor to a smoothing capacitor, the step-up operation is controlled by a clock signal and an AND logic signal between the clock signal and a negative feedback control signal of an output voltage of the charge-pump type step-up circuit. The negative feedback control signal is a pulse width modulation signal so that a frequency of the AND logic signal is always the same as that of the clock signal.

REFERENCES:
patent: 6456153 (2002-09-01), Buck et al.
patent: 6476665 (2002-11-01), Buchschacher
patent: 6791212 (2004-09-01), Pulvirenti et al.
patent: 7253676 (2007-08-01), Fukuda et al.
patent: 11-018419 (1999-01-01), None
patent: 2005-020971 (2005-01-01), None

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