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Design Procedure of the Inverter for LCD Backlight using Piezoelectric Transformer  

Kweon Gie-Hyoun (삼성전기 DM사업부 PS연구)
Cho Sung-Koo (전남대 전기공학과)
Lim Young-Cheol (전남대 전기공학과)
Yang Seung-Hak (호남대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.9, no.6, 2004 , pp. 577-583 More about this Journal
Abstract
Optimal parameters were selected to design an inverter circuit that drives a cold cathode fluorescent lamp for LCD backlight using a piezoelectric transformer and it was verified by an experiment. In this paper, the applied inverter topologies are a push-pull type and a half-bridge type, and the dimming control methods of these drive system were used a analog control method and a burst control method each other. When change a control voltage from 2.5V to 4.5V in the analog control method, the brightness 0-100% was seen in current 1-6 mA. And, the input/output efficiency were obtained 90.3%. Also, the control performance of 1-6 mA was seen in duty ratio 5-50% in the burst control method, and the input/output efficiency of the designed inverter got 82.1%.
Keywords
CCFL; Piezoelectric Transformer; Push-Pull, Half-Bridge; Dimming Control;
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  • Reference
1 35-th ICAT Smart Actuator Symposium : Conference Note. April 18-19, 2002
2 G. H. Kweon, Y. C. Lim, S. H. Yang. 'An analysis of the backlight inverter by topologies' IEEE, ISIE-2001
3 Chih yi Lin, 'Design and Analysis of Piezoelelctric Transformer Converters', Academic Press, 1997
4 Data sheet & User's Guide Note, Multi-Topology Piezoelectric Transformer Controller, Texas Instrument. January 2002