Method and apparatus to control light intensity as voltage fluctuates
US9078325B2 · kind B2 · utility
0Cited by
5References
8Claims
0Family size
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Key dates
| Filing date | Mar 15, 2013 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Apr 18, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for generating a pulse width modulated voltage that has a duty cycle that is inversely proportional to a sensed battery voltage and using the generated pulse width modulated voltage to control a light emitting diode to maintain the intensity of light emitted as the battery voltage fluctuates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.