本論文主要研製一高效率LLC同步整流串聯諧振轉換器。此電源供應器全機結構包含前端的電磁干擾濾波器，可有效濾除系統端雜訊所造成的干擾問題，前級使用升壓型主動功率因數修正器，以提升電路操作時的功率因數，減低其電流諧波成分，進而達到良好的電力品質。後級採用LLC串聯諧振轉換器，並藉由提高切換頻率以縮小磁性元件的體積，且利用零電壓切換與同步整流技術，以達到高功率密度及高轉換效率的要求。另外，加入保護電路(OVP、OCP、SCP)，以避免電源供應器內部元件在不正常的操作下受到損害。文中除了說明兩個主架構的動作原理外，並詳細說明了設計考量與電路中重要元件值之規格，且搭配Mathcad模擬軟體模擬串聯諧振電路輸出電壓頻率響應圖，了解品質因數Q、K因子與特性阻抗Zo對曲線的影響。最後進行分析找出合適之操作點。
本文實作出一台AC/DC電源供應器，輸入電壓90 ~264 Vac、輸出電壓DC 12V、輸出滿載電流20A。全機效率在115 Vac交流輸入且滿載下高達90%。在20%、50%、75%、100%四種負載情況之四點平均效率下，交流輸入電壓115Vac可達89.5%，230Vac可達90.7%，證明電路從輕載至滿載皆保持高轉換效率且輸出穩壓率皆小於±1%，最後估計全機功率損耗，並研擬未來研究方向。

This thesis focuses on the study and implementation of a high-efficiency LLC series resonant converter (SRC) with synchronous rectification. An EMI filter is used to suppress the conducted noise resulted from the switching device and the parasitics. The front-end part of the converter is a boost power factor corrector (PFC) to eliminate the current harmonics and raise the input power factor. The second stage is a high-frequency LLC SRC. In order to further improve the efficiency and increase the power density, zero-voltage switching and synchronous rectification technologies are adopted. The main controller features several protection circuits to protect the power converter. The operations and mathematical analysis for the PFC and LLC SRC are discussed. For the LLC SRC, the relationships among the voltage gain, quality factor (Q), inductor ratio (K) and characteristic impedance (Zo) have been analyzed and simulated with Mathcad.
Finally, the experimental results from the implemented prototype converter with an ac input voltage of 90 ~ 264 Vac, a dc output voltage of 12 V and the rated output load of 20 A are measured. The overall efficiency is up to 90 % for the full load condition. And the average efficiency is 89.5 % for 20-%、50-%、75-% and 100-% load conditions at the ac input voltage of 115 Vac ,and 90.7 % at 230 Vac.

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