Load control device for use with lighting circuits having three-way switches
US7772724B2 · kind B2 · utility
36Cited by
19References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2007 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Sep 11, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A smart switch for control of a lighting load from an AC voltage source can replace any switch in a three-way lighting control system. The smart switch can be connected on the line-side or the load-side of a three-way system with a standard three-way switch in the other location. The switch includes two semiconductor switches to control the connected lighting load. The switch preferably includes two sensing circuits for detecting the voltages at two of the load terminals of the switch to determine the state of the connected three-way switch(s), and thus, the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.