Split phase inverters for CCFL backlight system
US7187139B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2004 |
| Grant date | Mar 6, 2007 |
| Priority date | — |
| Expiry date | Oct 27, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for driving a lamp are provided. In one embodiment, an inverter having four switching elements is split into two inverter arms that are deployed at separate terminals of a floating lamp structure to achieve even light output. A controller drives both inverter arms such that power switching lines do not cross the floating lamp structure. In one embodiment, the controller adjusts the brightness of the lamp structure by adjusting the phase difference between outputs of a first inverter arm relative to a second inverter arm. In one embodiment, the controller adjusts the brightness by symmetrically pulse width modulating the outputs of the first inverter arm and the second inverter arm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.