Circuitry and methodology for driving multiple light emitting devices
US8558760B2 · kind B2 · utility
0Cited by
7References
94Claims
0Family size
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Key dates
| Filing date | Aug 5, 2004 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Dec 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
High efficiency drive circuitry for a group of parallel-connected light emitting devices, in which each device is driven in series by a respective source of bias current. The maximum voltage drop among the group of biased light emitting devices is determined and in response, a control voltage to drive all the light emitting device at the lowest effective voltage for the LED group is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.