本篇論文主要研製一台適用於寬範圍輸出電壓直流-直流轉換器，前級架構上選用由半橋串聯諧振轉換器延伸來的三階串聯諧振轉換器
，同時擁有零電壓切換之特性，減少高頻化的切換損失，在一次側開關由兩個串接成四個。藉由開關責任週期不同，先調整前級輸出電壓，讓後級轉換器電壓轉換比變化不需太寬。後級架構為降壓型轉換器，利用簡易電壓控制模式，改變誤差放大器參考點電壓，來達成寬範圍輸出電壓之目的。本文除了介紹電路之動作原理外，也詳細說明了諧振槽各參數的影響，並搭配Mathcad 與 Simplis 模擬軟體驗證理論分析，找出適合之操作點。
　　本文實作出一台DC-DC轉換器，輸入電壓DC 400 V，輸出電壓為DC 20~600 V，最大輸出電流為4 A，在輸出電壓600 V時25 %、50 %、75 %、100 %四個負載的效率皆可達到93 %以上，最後透過簡易了損耗分析，分析全機的損耗分佈，並提出未來研究方向。

This thesis focuses on the study and implementation of a wide output voltage DC-DC converter. The front architecture is three level series resonant converter. This converter extends from half-bridge series resonant converter and have zero-voltage switching (ZVS) property so that the power switch loss can be reduce. The primary side of converter have used four power MOSFET and to adjust output voltage by power MOSFET different switching, so the second stage converter transform ratio can be decreased. The second stage is buck converter using voltage control mode and changing error amplifier reference voltage to reach wide output voltage object. The operation and mathematical analysis for the series resonant and buck converter are discussed. For the resonant tank is described in the detail with Simplis and Mathcad.
Finally, the experimental results from the implemented prototype converter with an dc input voltage of 400 V, a dc output voltage maximum 600V and the rated maximum output load of 4 A are measured. For 20-%, 50-%, 75-% and 100-% load efficiency is up to 93%. By creating a loss analysis and proposed future research directions.

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