Primary side current balancing scheme for multiple CCF lamp operation
US7557517B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2007 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Feb 3, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlight system drives multiple lamps using balanced groups of serially-connected lamp transformers. A plurality of lamp transformers is divided into multiple transformer groups. Primary windings of the lamp transformers are coupled in series in each transformer group. Lamps are coupled to secondary windings of the lamp transformers. The transformer groups are arranged in a parallel configuration. One or more balancing transformers couple the transformer groups to a common power source. The balancing transformers divide a common current from the common power source into multiple balanced currents for the respective transformer groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.