Balancing transformers for multi-lamp operation
US7560875B2 · kind B2 · utility
3Cited by
152References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2007 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Nov 9, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F30/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondary windings coupled together in a closed loop. The secondary windings conduct a common current and the respective primary windings conduct proportional currents to balance currents among the lamps. The ring balancer facilitates automatic lamp striking and the lamps can be advantageously driven by a common voltage source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.