Low voltage motion sensor for activating a high voltage load
US4820938A · kind A · utility
33Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1988 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Jun 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1609
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention utilizes a latching relay having on and off inputs for controlling power to a load. The on and off inputs of the relay are controlled by pulse generators which are in turn controlled by an occupancy sensor circuit. These pulse generators provide pulses when movement is initially detected in a room and when no movement has been detected for a predetermined time, respectively. The outputs of the pulse generators are coupled to an isolation circuit which isolates the power supply for the occupancy sensor from the pulses during each pulse to prevent damage to the power supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.