OVERVOLTAGE PROTECTION CIRCUIT
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United States of America Patent
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Issued Date -
Apr 30, 2015
app pub date -
Oct 23, 2014
filing date -
Oct 25, 2013
priority date (Note) -
Abandoned
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Abstract
An overvoltage protection device uses a varistor coupled in series with a switch between two terminals provided for connection to a circuit device or element to be protected. A control circuit controls actuation of the switch in response to sensing voltage at or between the two terminals in excess of a first threshold. The first threshold is less than a clipping voltage of the varistor but in excess of a supply voltage for the circuit device or element. The control circuit further controls detactuation of the switch based, for example, on elapsed time from actuation or current flow.
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