Knowledge-based driver apparatus for high lumen maintenance and end-of-life adaptation
US8072163B2 · kind B2 · utility
2Cited by
4References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 21, 2009 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Jun 26, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A knowledge-based driver is provided for powering a solid-state light source with a constant current, including a memory that stores lumens per amp and volts per amp performance characterizations of the light source over time, and a controller that operates in a test mode to estimate the light source degradation based on voltage feedback obtained at a predetermined test current value, and to adjust the drive current in normal operating mode according to the estimated device degradation to implement constant lumens control without external optical feedback components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.