Realization study of Hybrid Dimming Control for CCFL Inverter

• Main Authors: Ming-chia Wu, 吳明佳
• Other Authors: Guan-chyun Hsieh
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/69558740596004471632

碩士 === 國立臺灣科技大學 === 電子工程系 === 95 === This thesis proposes a hybrid dimming controller for self-oscillation Royer inverter. The hybrid dimming controller is composed of a dead-time-modulated pulse-width-modulation (DTM-PWM) controller and a soft-burst circuit. To reduce leakage current resulted from parasitic capacitance in the lamp, we utilize floating lamp structure with primary-side dimming control in this study. In order to increase the overall system efficiency and reduce EMI resulted from the difference between buck drives frequency and Royer resonant frequency we use the dead-time-modulated pulse-width-modulation controller. Besides, a soft-burst technique is adopted for eliminating the ignition current and voltage spike during dimming process. Comprehensive analysis and design considerations are discussed in detail in this thesis. An inverter is actually designed according to this thesis, which indicates that experimental results are close to the theoretical prediction.