DA/AC convert for driving cold cathode fluorescent lamp
US7825605B2 · kind B2 · utility
5Cited by
63References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2006 |
| Grant date | Nov 2, 2010 |
| Priority date | — |
| Expiry date | Dec 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a DC/AC converter in the backlight power supply system using cold cathode fluorescent lamp (CCFL). The DC/AC converter comprises a front end DC/DC converter, a full-bridge or half bridge inverter, and a piezoelectric transformer. Even with a wide range of input voltages, the front end DC/DC converter produces a predetermined DC voltage or a DC voltage with a predetermined small range and the cascaded inverter operates with a switching frequency close to the resonant frequency of the piezoelectric transformer, which helps the backlight power supply system achieve high efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.