Two light level ballast
US7218063B2 · kind B2 · utility
8Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 2005 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | Jan 21, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast (100) for powering at least one gas discharge lamp (30) at two selectable light levels includes a sensing transformer (120) and a detector circuit (200). Detector circuit (200) provides an output voltage that is dependent on the states of two on-off switches (S1,S2) interposed between the ballast (100) and a conventional AC source (20). The output voltage of the detector circuit (200) is used to control the illumination level of the lamp (30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.