Study and Implementation of a CCFL Driving Inverter Applying Inductor Current Balance Circuit

• Main Authors: Chia-Kun Chen, 陳嘉坤
• Other Authors: Yu-kang Lo
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/20304323189495796444

碩士 === 國立臺灣科技大學 === 電子工程系 === 97 === The subject of this thesis is to design a CCFL full-bridge inverter with inductor current balance circuit. Since the load of a CCFL inverter is composed of lamps, the characteristics of these lamps must be studied first in detail. Then the equivalent circuit model of the CCFL is developed based on the mechanical dimensions of the backlight module. From the developed CCFL model and the concept of impedance, the MathCAD software tool can be adopted to calculate the required inductance of the current balance circuit and the resonant capacitance. The parameters of the transformer, such as turns ratio and secondary leakage inductance are obtained. Finally, a CCFL inverter prototype driving up to 16 lamps is implemented and tested. Satisfactory results are recorded to verify the theoretical analysis.