Self-powered sensor for use in closed-loop security system
First Claim
1. A self-powered sensor for a closed-loop security system, comprising:
- (a) self-powered sensor network means for providing a switch actuating signal upon the detection of a physical condition wherein said self-powered sensor network means comprises transducer means, said transducer means having a pair of plates separated by a piezoelectric element and having a transient alternating current output, and voltage doubling circuit means responsive to the output of said transducer means, said pair of plates forming a charge storage element of said voltage doubling circuit means, for approximately doubling the peak voltage output of said transducer means to provide said switch actuating signal for a predetermined period of time; and
(b) electronic switch means, said electronic switch means having a semiconductor junction forming a diode included in said voltage doubling circuit means, said electronic switch means being in a normally closed position thereby allowing current in said closed-loop security system to flow therethrough, for opening said closed-loop security system in response to said switch actuating signal.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
9 Claims
-
1. A self-powered sensor for a closed-loop security system, comprising:
-
(a) self-powered sensor network means for providing a switch actuating signal upon the detection of a physical condition wherein said self-powered sensor network means comprises transducer means, said transducer means having a pair of plates separated by a piezoelectric element and having a transient alternating current output, and voltage doubling circuit means responsive to the output of said transducer means, said pair of plates forming a charge storage element of said voltage doubling circuit means, for approximately doubling the peak voltage output of said transducer means to provide said switch actuating signal for a predetermined period of time; and (b) electronic switch means, said electronic switch means having a semiconductor junction forming a diode included in said voltage doubling circuit means, said electronic switch means being in a normally closed position thereby allowing current in said closed-loop security system to flow therethrough, for opening said closed-loop security system in response to said switch actuating signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification