Method and system for dimming light sources
US7642734B2 · kind B2 · utility
44Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2006 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Jul 16, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3921
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Dimming a light source such as a LED over a dimming range (0%-100%) involves adjusting at least one of the intensity (I) and the duty-cycle (DR) of a current flowing through the light source. The dimming range includes at least one portion (L%-H%; 0%-H%) where the light source is fed with a current whose intensity (I) is switched with a given duty cycle (DR) between a non-zero on value and zero, the non-zero on value being a fraction of the rated value (Irated), whereby joint CC and PWM dimming is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.