Directly driven high efficiency LED circuit
US8896227B2 · kind B2 · utility
8Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2011 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Feb 23, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system for directly driving light emitting diodes (LEDs). A string of LEDs is coupled across an input voltage and includes a plurality of separate groups of LEDs. Each of a plurality of switches is coupled in parallel with an associated one of the groups of LEDs for controlling current flow through the associated group of LEDs in response to a control signal from a controller circuit. A switch protection circuit is associated with at least one of the switches. The switch protection circuit is configured to place the switch into a conducting state in the event of failure of an LED in the associated group of LEDs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.