LED device with simultaneous open and short detection function and method thereof
US8344661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2009 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Mar 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/23
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED device with simultaneous open and short detection function includes a plurality of LED strings, a voltage converter, a current driving unit, a loop control unit, an open detector, a short detector and a voltage detector. The open detector and the short detector are utilized for detecting LED open and LED short for the plurality of LED strings, respectively. The voltage detector is coupled to the open detector, the short detector and the voltage converter, and is utilized for generating a reset signal to the short detector according to an output voltage of the voltage converter when the LED open occurs on the plurality of LED strings, so as to initiate the LED short detection for the plurality of LED strings again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.