Push-pull driver with null-short feature
US7173380B2 · kind B2 · utility
0Cited by
25References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 2005 |
| Grant date | Feb 6, 2007 |
| Priority date | — |
| Expiry date | Jul 14, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/2824
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a full-bridge switching topology. The first and the second primary windings alternately conduct currents in opposite polarities to generate an alternating current signal to power one or more lamps coupled to a secondary winding of the transformer. The third primary winding is short-circuited to preserve energy stored in the transformer in a null state when both the first and the second primary windings are not conducting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.