本論文主旨為研製37吋液晶顯示器RGB LED背光模組之驅動電源，驅動電源的前級使用主動式功率修正器，以改善功率因數及輸入電流總諧波失真率。DC/DC轉換器採用半橋串聯諧振電路架構供應背光源RGB LED所需之驅動電壓，其具有零電壓切換特性可提高轉換效率。本論文提出一創新相移式PWM均流控制策略，並可藉由改變PWM責任週期而達到白平衡。最後設計一個實例電路，以實驗結果的量測數據驗證電源架構及控制方法的可行性。

This thesis presents a power supply of the RGB LED backlight driver for 37-inches LCD. For power module’s front-end an active power factor corrector (PFC) is used to improve the power factor (PF) and reduce the total harmonic distortion (THD) of the input current. For the DC/DC part a half-bridge series resonant converter is adopted to supply the RGB LED voltage which has zero-voltage-switching to raise conversion efficiency. An average-current phase-shift control strategy of varying PWM duty ratio is addressed to attain the white light balance. The final implementation results verify this toplogy and provide the viability of the control method.

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