Soft-start circuit

Details Soft-start circuit Soft-start circuit

2009-04-07

2011-10-04

Riley, Shawn (Department: 2838)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C323S901000, C327S143000

Reexamination Certificate

active

08030978

ABSTRACT:
A soft-start circuit is provided. The soft-start circuit comprises: an input stage, a pump stage, a second resistor and a capacitor. The input stage comprises a first resistor to receive an input voltage to provide a reference current at a first node. The pump stage comprises N current branches connected in parallel each comprising a current source connected to the first node and a switch to transfer the current from the current source to the second node while the switch operates in a connecting state. The switches has 2Nconnecting modes performed one after another to generate an output current with a gradual increment output current at the second node with 2Ncurrent levels; and the second resistor and the capacitor are connected in parallel between the second node and the ground potential to generate an output voltage with a gradual increment with 2Nvoltage levels according to output current.

REFERENCES:
patent: 7180757 (2007-02-01), Chen et al.
patent: 7560915 (2009-07-01), Ito et al.
patent: 7948284 (2011-05-01), Watanabe et al.

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