High efficiency, low energy storage driver circuit for solid state light sources
US8896220B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2012 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Feb 9, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device, system and method to drive light emitting diodes (LEDs) are disclosed. An exemplary system may include a string of LEDs coupled across a voltage source configured to provide an input voltage. The string of LEDs may include a plurality of separate groups of LEDs and a plurality of switch circuits. Each of the switch circuits may include a switch coupled in parallel with an associated one of the groups of LEDs to control current flow through the associated group of LEDs in response to a control signal from a controller circuit. A switch protection circuit may be associated with at least one of the switches. A steering circuit may also be coupled in series and associated with each of the groups of LEDs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.