Fault detection mechanism for LED backlighting
US7800876B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2007 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Jul 23, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/54
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fault detection mechanism for a LED string comprising a plurality of serially connected LEDs, the fault detection mechanism comprising: a control circuitry; and a voltage measuring means, in communication with the control circuitry, arranged to measure the voltage drop across at least one LED of the LED string, the control circuitry being operable to: measure the voltage drop, via the voltage measuring means, at a plurality of times, compare at least two of the measured voltage drops, and in the event the comparison of the at least two voltage drops is indicative of one of a short circuit LED and an open circuit LED, output a fault indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.