近年來，如風力、太陽能和燃料電池等潔淨能源，在各方積極研究下已發展出各種再生能源發電系統。其中，燃料電池有高能量密度、大電流輸出能力、潔淨發電以及高效率操作的優點，然而由於在各種不同負載、溫溼度和電化學反應條件下，燃料電池係低壓輸出且會有相當大的輸出電壓範圍變化特性，為了提供負載穩定電壓源，因此必須在燃料電池與負載之間加入升壓型直流/直流轉換器。
本論文研究內容為分析具柔切特性之電流饋入式全橋直流/直流轉換器，在二次側使用倍壓整流電路並與傳統硬切轉換器作比較。透過外加的柔切機制，可實現零電壓切換，藉此提升電路之效率。本文所完作的1.2 kW雛形轉換器，其實驗結果之波形與理論十分接近。

Recently, clean energy resources such as wind powers, photovoltaic systems and fuel cells have been exploited for developing renewable electric power generation systems. Among them, the fuel cells feature advantages such as high energy density, high current output capability, clean electricity generation and high-efficiency operation. However, the fuel cell stacks present a low voltage output and wide range of voltage variations under different load, temperature, humidity, and electrochemical reaction conditions. In order to provide the load with a constant high voltage DC bus, a step-up DC/DC converter must be added between the fuel cell stacks and the load.
In this thesis, a current-fed full-bridge DC/DC converter with soft switching and secondary voltage-doubler rectification is studied. Besides, it is compared with a traditional hard-switching counterpart. By adding the external soft-switching cell, the zero-voltage switching (ZVS) can be achieved. Thus, the conversion efficiency is improved. The recorded experimental waveforms of a 1.2-kW prototype converter are very similar to the theoretical analysis.
Keywords: Fuel cells, full-bridge DC/DC converter, current-fed, voltage-doubler rectifier, zero-voltage switching.

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