Patent · US Active

Power latch

US7893566B2 · kind B2 · utility

6Cited by

6References

4Claims

0Family size

Assignee

FAIRCHILD SEMICONDUCTOR CORPORATION · US

Inventors

Roy L. Yarbrough · Hiram, US
Julie Lynn Stultz · Scarborough, US
Steven Macaluso · Scarborough, US

Key dates

Filing date	Mar 13, 2009
Grant date	Feb 22, 2011
Priority date	—
Expiry date	Jul 20, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH03K3/356
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A circuit that automatically, seamlessly connects the higher (or the lower) of two power supplies to an output is described. The circuit does not incur a one diode drop when the two power supplies are at about the same voltage levels, and the unused power supply draws no stand-by current. Cross coupled transistor and cross coupled inverters are employed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.