Constant current light emitting diode (LED) driver circuit and method
US7944153B2 · kind B2 · utility
97Cited by
7References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 17, 2007 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Nov 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive circuit supplies a drive current to a plurality of light emitting diodes. The drive circuit includes a voltage converter circuit having a particular topology and including at least one inductive element and at least one switching element. The drive circuit senses a current through one of the inductive and switching elements and generates a feedback signal from the sensed current. The feedback signal has a value indicating the drive current being supplied to the light emitting diodes and the drive circuit controls the operation of the voltage converter responsive to the feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.