Devices and methods for detecting operational failures of relays
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United States of America Patent
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Jul 22, 2008
Grant Date -
Dec 8, 2005
app pub date -
Jun 4, 2004
filing date -
Jun 4, 2004
priority date (Note) -
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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.
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