Switching power supply device

Details Switching power supply device Switching power supply device

2006-05-25

2008-03-25

Laxton, Gary L. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S285000

Reexamination Certificate

active

07348766

ABSTRACT:
The peak current flowing to the switching device drops in a no-load state with PWM control, but because the number of switching operations is constant regardless of the load, further reducing power consumption is difficult. The switching power supply device has a PWM signal generator for generating a PWM signal, a switching device Q1for switching the first supply voltage VIN based on the PWM signal, converters for outputting the difference between a second supply voltage and a reference voltage as a difference signal, and an intermittent oscillation control circuit for stopping the switching operation of the first switching device when the difference signal is less than a predetermined first threshold value (Vp1). The PWM signal generator changes the pulse width based on the difference signal to generate the PWM signal.

REFERENCES:
patent: 6420858 (2002-07-01), Kitagawa et al.
patent: 2003/0112040 (2003-06-01), Yoshimura
patent: 10-191625 (1998-07-01), None
patent: 2000-350440 (2000-12-01), None
patent: 2001-112241 (2001-04-01), None
patent: 2003-189632 (2003-07-01), None

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