Soft start circuit, power supply unit and electric equipment

Details Soft start circuit, power supply unit and electric equipment Soft start circuit, power supply unit and electric equipment

2008-07-29

2008-07-29

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S315000, C323S901000

Reexamination Certificate

active

07405549

ABSTRACT:
A soft start circuit includes a constant current source for generating a constant current, a first current mirror circuit for generating from the constant current a first mirror current, a second current mirror circuit for generating from the constant current a second mirror current smaller than the first mirror current, and a capacitor into which a difference between the first mirror current and the second mirror current is introduced, wherein a divided voltage of a charging voltage thereof is output as a soft start voltage. The soft start circuit provides a gradual soft start voltage.

REFERENCES:
patent: 7088078 (2006-08-01), Liu
patent: 7106036 (2006-09-01), Collins
patent: 7218080 (2007-05-01), Yang
patent: 7262582 (2007-08-01), Warita et al.
patent: 07-336999 (1995-12-01), None

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