燃料電池與電力電子技術上的迅速發展，促使燃料電池動力系統上也取得了重大進展。燃料電池的特性不同於傳統的化學製成電池，當燃料電池連結上負載後其輸出電壓會迅速的下降，當輸出電流上升時其輸出電壓也逐漸下降。在燃料電池電力系統裡，總是需要低電壓輸入/高電壓輸出之轉換器，以得到高效率與好的電壓調節率。本論文中，研究出具數位控制之電流饋入全橋直流-直流轉換器，且能應用於燃料電池上，其工作原理與設計上的考慮都將在此分析與討論。在此實作出一台具2.5 kW標定功率的實驗原型機並且測試，其輸入電壓為44 V至80 V，輸出電壓為365 V，而原型轉換器使用數位訊號處理器(Digital Signal Processing, DSP)晶片TMS320F2808實現數位控制。在此為了能減少元件的應力與提昇其轉換效率，而實現主動箝位電路。在此原型轉換器的實驗結果將呈現與討論，以用於驗證研究計畫的可行性。

The rapid advances in fuel cell technology and power electronics have enabled the significant developments in fuel cell power system. The fuel cell characteristics are different from those of the traditional chemical-powered battery. The fuel cell output voltage drops quickly when first connected with a load and gradually decreases as the output current rises. In fuel cell power systems, a low voltage input/ high voltage output DC/DC converter is always needed to obtain high conversion efficiency and good voltage regulation. In this thesis, a digital-controlled current-fed full-bridge DC-DC converter is studied for fuel cell applications. The operating principles and design considerations are analyzed and discussed. A laboratory prototype with 2.5 kW rated power has been built and tested. The input voltage is from 44 V to 80 V and the output voltage is 365 V. A DSP chip TMS320F2808 is used to realize the digital controller of the prototype converter. An active-clamp circuit is also realized to reduce the device stresses and raise the conversion efficiency. Experimental results of the prototype converter are shown and discussed to verify the feasibility of the studied scheme.

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