LED driving topology, light source module based thereon, and digital camera having the same
US8159138B2 · kind B2 · utility
1Cited by
7References
6Claims
0Family size
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Key dates
| Filing date | Mar 5, 2009 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Sep 7, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A LED driving topology includes a LED array and a current source connected in series between two power inputs receiving a positive voltage and a negative voltage respectively. This topology increases the voltage difference across the LED array and hence has the capability of lighting up more serially connected LEDs, without requiring an additional boost circuit or a high voltage. In addition, the circuit of the current source can be made by a low-voltage manufacturing process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.