Method and apparatus for bi-directional current limit in a...

Details Method and apparatus for bi-directional current limit in a... Method and apparatus for bi-directional current limit in a...

2007-08-28

2007-08-28

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S270000, C361S018000

Reexamination Certificate

active

11130675

ABSTRACT:
A power supply system having a transistor, a linear regulator, a DC-DC converter, and a control circuit. The transistor has an input, a substrate, a first node, and a second node. The first node is operably coupled to a non-battery power source. A linear regulator is operably coupled to the second node to produce a regulated output voltage based on the non-battery power source, when enabled. A DC-DC converter is operably coupled to produce the regulated output voltage based on a battery power source, when enabled. A control circuit is operably coupled to the input node and the substrate of the transistor wherein when the DC-DC converter is enabled, the control circuit controls a reverse leakage current of the transistor, and when the linear regulator is enabled in a zero load-state, the control circuit controls a forward leakage current of the transistor, and when the linear regulator is enabled in a non-zero load-state, the control circuit provides a current limit for the linear regulator.

REFERENCES:
patent: 5574358 (1996-11-01), Garrett
patent: 5677558 (1997-10-01), McGlinchey
patent: 6690147 (2004-02-01), Bonto
patent: 6853171 (2005-02-01), May
patent: 6867573 (2005-03-01), Carper

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