Self-powered sensor for use in closed-loop security system
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United States of America
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Jan 28, 1992
Grant Date -
N/A
app pub date -
May 16, 1990
filing date -
Feb 9, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A self-powered sensor for a closed-loop security system includes a self-powered sensor network which provides a switch-actuating signal upon the detection of a physical condition. An electronic switch, which is in a normally closed position, is connected between the positive and negative poles of a closed-loop security system and opens the loop upon receipt of the switch-actuating signal thereby triggering an alarm. The self-powered sensor network may include a voltage doubler for converting the AC output of a transducer to a DC voltage of an amplitude sufficient to open the switch. When the switch is opened, voltage from the closed-loop security system becomes available to power a visible or audible alarm identifying the sensor that opened the loop.
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