LED control circuit and method
US8288967B2 · kind B2 · utility
47Cited by
10References
48Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 11, 2010 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Jun 7, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A LED control circuit and method determine the frequency and duty of a LED driving signal according to a swing control signal and a dimming control signal, respectively. Responsive to the swing control signal, a pulse edge generator generates a clock whose frequency is determined by the swing control signal. Responsive to the clock and the dimming control signal, a duty ratio controller generates the LED driving signal whose frequency is determined by the clock frequency and whose duty is determined by the dimming control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.