Self-powered sensor for use in closed-loop security system
US4745398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1987 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Feb 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B23/00
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.