Circuits and methods for powering light sources
US8237379B2 · kind B2 · utility
6Cited by
15References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 2011 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Sep 8, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A controller for regulating a current through a light-emitting diode (LED) light source includes a first reference pin for receiving a first reference signal indicative of a target average level, and a dimming control pin for receiving a dimming signal. The controller regulates an average level of the current to the target average level. The current is regulated according to the first reference signal and a ramp signal if the dimming signal has a first level. The ramp signal is synchronized with the dimming signal. The current is cut off if the dimming signal has a second level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.