LED driver circuit for providing desired luminance with constant current
US7863825B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2007 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Jun 18, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED driver circuit that sinks pure DC current through LEDs. According to the invention, a constant current sink circuit is coupled to a full bridge rectifier. The full bridge rectifier includes at least a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm. The first bridge arm and the fourth bridge arm are connected in parallel with the third bridge arm and the second bridge arm in opposite directions, respectively. The connection of the first bridge arm and the third bridge arm and the connection of the second bridge arm and the fourth bridge arm are connected in series. Each of the bridge arms may consist of at least one LED. The constant current sink circuit is used for sinking pure DC current. The LEDs can be driven by pure constant current and can provide desired luminance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.