本論文主要研製一台高功率因數與高效率的LED驅動器，第一級電路採用臨界模式主動功率因數校正器，提高驅動器的功率因數；第二級電路採用非對稱半橋返馳式轉換器，該架構的初級側功率開關具有零電壓切換特性，次級側同步整流開關具有零電流切換特性，使得整體LED驅動器達到高效率之目的。
本文詳細分析與討論非對稱半橋返馳式轉換器在連續模式與非連續模式的動作原理，最終實現與測試一台216W LED驅動器，驗證理論分析與SIMPLIS模擬。根據實驗的結果，在滿載條件下效率可高於90%。

This thesis presents the study and implementation of a high power factor and high efficiency LED driver. The first stage circuit uses a boundary mode active power factor corrector to increase power factor of LED driver. The second stage circuit uses an asymmetrical half-bridge flyback converter with synchronous rectification which features zero-voltage switching (ZVS) of primary power switches and zero-current switching (ZCS) of secondary synchronous switch to make the LED driver achieve high overall efficiency.
The thesis analyzes and discusses thoroughly about operation principles of asymmetrical half bridge flyback converter at continuous conduction mode and discontinuous conduction mode. A 216W LED driver prototype was implemented and tested to verify the theoretical analysis and SIMPLIS simulation. Based on experimental results, the efficiency is higher than 90% under full-load condition.

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