Control circuit and method for controlling light emitting diodes
US7768216B2 · kind B2 · utility
4Cited by
8References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2006 |
| Grant date | Aug 3, 2010 |
| Priority date | — |
| Expiry date | Mar 7, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit for controlling light emitting diodes comprises a switch for turning on or off a string of light emitting diodes. A combiner generates a control signal from a data signal and a noise signal. A sigma delta modulator receives the control signal and a clock signal with a clock period and generates a switching signal for controlling the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.