Two wire PIR occupancy sensor utilizing a rechargeable energy storage device
US5786644A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Apr 16, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/18
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A two wire detection device includes a relay switch setable to a high and a low impedance state and electrically coupled between a first terminal of an AC source and a first leg of a load, a second leg of which is connected to a second terminal of the AC source. The device includes an energy storage device electrically coupled to the first terminal of the AC source and electrically connected to the first leg of the load. Charge control means interposed between the first terminal of the AC source and the energy storage device regulate the voltage across the energy storage device. A detection control device is electrically connected across the energy storage device and to the switching device for detecting the presence of a condition for monitoring and setting the state of the switching device based thereon such that power is available to the detection control device regardless of the state of the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.