Led drive circuit
US5912568A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED drive circuit comprising a plurality of LEDs coupled together in parallel, the LEDs configured to be powered by a battery. A current source coupled to the LEDs provides a current signal level for driving the LEDs. A current sensor circuit is coupled to the current source and is configured to provide a first indication signal in response to the current signal flowing in the LEDs. A controller circuit is coupled to the current sensor so as to receive the indication signal. The controller circuit is further coupled to the current source so as to provide an appropriate control signal to the current source so that the current drawn through the LEDs remains substantially at a desired level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.