Soft-start voltage circuit

Details Soft-start voltage circuit Soft-start voltage circuit

2011-03-15

2011-03-15

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

C323S901000, C363S049000

Reexamination Certificate

active

07906945

ABSTRACT:
A soft-start voltage circuit includes an operational amplifier, a first and a second capacitors, a first and a second switches, and a voltage level shifter. The operational amplifier includes a positive end, a negative end, and an output end coupled to the negative end of the operational amplifier for outputting the soft-start voltage. The voltage level shifter is coupled between the first capacitor and the positive end of the operational amplifier for shifting a level of the voltage on the first capacitor. The first switch is coupled between the first and the second capacitors for coupling the first and the second capacitors according to the clock. The second switch is coupled between the second capacitor and the negative end of the operational amplifier for coupling the second capacitor and the negative end of the operational amplifier according to the inverted clock.

REFERENCES:
patent: 7009371 (2006-03-01), Nakata
patent: 7075804 (2006-07-01), Shearon et al.
patent: 7151360 (2006-12-01), Kim et al.
patent: 2005/0007167 (2005-01-01), Tange

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