Two-wire controlled switching
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 13, 2003
Grant Date -
Jun 6, 2002
app pub date -
Dec 4, 2000
filing date -
Dec 4, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switching circuit which facilitates electrically controlled actuation of a switching device, such as a relay, in a two-wire circuit where access may be gained only to an active conductor. The switching circuit includes an electrically actuatable switching device which is arranged to be connected in series with a load in the form of a lamp in a single phase as circuit. A solid state second switching device is connected in series with the first switching device. A first energy storage device is connected across the first and second switching devices and a second energy storage device is connected across the second switching device. Gating circuitry associated with the second energy storage device is provided to effect periodic ON-OFF gating of the second switching device during the time that the first switching device is actuated to a conducting state.
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