LED string driver arrangement with non-dissipative current balancer
US9030119B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 4, 2011 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Aug 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A solid state lighting driver arrangement exhibiting a plurality of LED strings receiving power from a single power source, the single power source providing a discontinuous current, wherein a plurality of first windings are provided, each associated with a particular LED string and coupled to provide current balancing between the various LED strings. The discontinuous current resets the windings during the off time or during a reversal period. In one particular embodiment, a second winding is magnetically coupled to each of the first windings, and the second windings are connected in a closed in-phase loop. In another particular embodiment, at least two of the first windings are magnetically coupled to each other, thus ensuring a balance between current in each LED string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.