本文提出適用於冷陰極螢光燈之數位調光控制電路，將冷陰極螢光燈操作於高頻下，再使用低頻脈寬調變的方式調整亮度。採用此種調光控制，冷陰極螢光燈操作在額定電流或無電流的狀況，可有效的降低燈管發光強度不平均的溫度計效應。本文使用之電路架構為全橋相移換流電路，文中詳細說明其動作原理及諧振電路參數之設計，由實驗的結果驗證理論之正確性，冷陰極螢光燈之光輸出於寬的調光範圍可線性的調整。

This thesis presents a digital dimming control circuit for cold cathode fluorescent lamp (CCFL). The CCFL inverter is operating at high frequency and the brightness is controlled by a low frequency pulse width modulation signal. By fully turning ON/OFF the CCFL with low frequency, the thermometer effect of CCFL can be eliminated. The phase-shifted full-bridge resonant inverter is employed in the presented CCFL inverter. In this thesis, comprehensive analysis and design consideration of the CCFL inverter are discussed in detail. Experimental results are consistent with the theoretical prediction, so that the light output of CCFL can be dimmed linearly within wide range.

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