Portable lighting device and method thereof
US8508142B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2012 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Feb 20, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A portable lighting device includes a controller, a power source that provides a voltage, and a load that includes a light emitting diode (LED) light source. The controller receives the voltage and regulates a current of the LED light source based on a sensing signal indicating the voltage of the power source. The controller regulates the current of the LED light source to a first current level if the voltage of the power source is greater than a first voltage level, and to a second current level if the voltage of the power source is less than a second voltage level. The second voltage level is less than the first voltage level. The controller regulates the current of the LED light source to vary according to the sensing signal if the voltage of the power source is between the first voltage level and the second voltage level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.