Current control device for driving LED devices
US7119498B2 · kind B2 · utility
78Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2004 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | Mar 31, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A current control device for driving LED devices uses a switched-mode current control loop inside of an output intensity low-frequency pulse width modulation (PWM) control loop. This allows separate control of current level (for accurate light wavelength output) and light intensity. The current control device requires only one switch to regulate current level, and no other switches for the intensity control. This allows lower parts count for greater reliability and lower system cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.