Dimming circuit and method for LEDs
US9000682B2 · kind B2 · utility
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3Claims
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Key dates
| Filing date | Mar 14, 2013 |
| Grant date | Apr 7, 2015 |
| Priority date | — |
| Expiry date | Apr 4, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dimming circuit and method for a LED provide a first driving voltage or a second driving voltage according to a dimming signal provided by a functional IC to enable or disable the LED. The values of the first and second driving voltages are controlled so that overstressing of the LED is avoided while the functional IC is capable of working even when the LED is off. The LED's life time is thus prolonged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.