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IEICE TRANSACTIONS on Communications

Application of Soft-Starting Technique to Improve Digital-Dimming Behavior for Backlight Module

Chang-Hua LIN

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Summary :

This paper proposes a simple control method to improve the ignition behavior of cold cathode fluorescent lamp (CCFL) in digital-dimming control. Due to restriking manipulation in digital-dimming mode, the lamp life of CCFL is reduced substantially. To extend the lamp life, we realize a digital-dimming controller with soft-starting technique (DDC-SST) to reduce the high ignition voltage and to eliminate the ignition current spike. The half-bridge resonant inverter is employed in the presented backlight system. Complete analysis and design considerations are discussed in detail in this paper. Simulation and experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The ignition voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.

Publication
IEICE TRANSACTIONS on Communications Vol.E87-B No.12 pp.3515-3521
Publication Date
2004/12/01
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Section on the 25th International Telecommunications Energy Conference (INTELEC'03))
Category
Rectifiers, Inverters and UPS

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