Devices and methods for detecting operational failures of...

Details Devices and methods for detecting operational failures of... Devices and methods for detecting operational failures of...

2004-06-04

2008-07-22

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including instrument

C361S160000

Reexamination Certificate

active

07403368

ABSTRACT:
An uninterruptible power supply (UPS) includes a power conversion circuit and a relay. The relay is configured to couple and decouple a power source to and from an input of the power conversion circuit. The control circuit is operative to apply a coil current to the relay to sense the coil current and to detect an operational failure of the relay from the sensed coil current. Related methods of operating such UPSs are also provided.

REFERENCES:
patent: 5241217 (1993-08-01), Severinsky
patent: 6226167 (2001-05-01), Chmiel
patent: 0 558 190 (1993-09-01), None
International Preliminary Report on Patentability, PCT/IB2005/001566, Jun. 14, 2006.

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