Rechargeable light-emitting diode driver circuit
US7649323B1 · kind B1 · utility
18Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2007 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Aug 19, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self-contained, rechargeable LED flashlight uses a zener diode in reverse-breakdown avalanche mode as a low-cost voltage regulator. A second embodiment of the LED flashlight incorporates boost-buck circuitry to allow the internal rechargeable flashlight battery to be recharged through external dry cells. An LED or LED array of the flashlight may be by passed with operator control to allow an internal battery to operate an external device, such as a cellular telephone or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.