Method and apparatus for dimming control of electronic ballasts
US6969955B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2004 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Jan 29, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for providing dimming control of an electronic ballast circuit that includes a electronic ballast circuit that is electrically connected to a plurality of input voltage terminals that can receive alternating current and the electronic ballast circuit is electrically connected to the plurality of fluorescent lamp terminals. There is at least one light sensor that is electrically connected to the electronic ballast circuit so that the electrical power applied at the plurality of fluorescent lamp terminals can be proportionally modified in relationship to the ambient light received by the at least one light sensor. Also, there is a plurality of switches that are electrically connected in one-to-one corresponding relationship to a plurality of resistive loads so that the electrical power applied at the plurality of fluorescent lamp terminals can be set at a plurality of predetermined lighting levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.