由於燃料電池特性為低壓輸出，其輸出電壓會因負載改變而有劇烈的變化，因此為了提供負載穩定的電源，必須在燃料電池與負載之間加入升壓型直流/直流轉換器。本論文選用的架構為三相隔離型直流-直流升壓轉換器，用於低壓輸入、高壓輸出的應用場合，包含由三個半橋所組成的三臂切換開關、三個隔離變壓器、三相整流二極體與輸出電感電容所組成的濾波電路。三個變壓器是以Δ-Y接的方式連結，使一次側並聯、二次側串聯。此電路架構使低壓大電流的一次側有很好的分流效果，而在升壓轉換中則有高電壓轉換比例的優點。數位信號處理器則協調控制電能轉換器模組間的開關驅動訊號，並結合增強型控制區域網路(Enhanced Control Area Network, ECAN)，控制輸出端的電流命令，使輸出功率由CAN BUS模組來執行功率調配的命令，並在回授端設計了兩種保護功能，分別為過電流及過電壓保護。功率開關的驅動方式使用了非對稱驅動的控制策略。
最後本論文完成一台2 kW的三相隔離型直流-直流升壓轉換器，輸入電壓範圍從50 V到100 V，輸出電壓為380 V。實驗結果驗證此系統的可行性，轉換效率亦可達90%以上。

The fuel cell stacks present a low output voltage with a wide range of variation at varying load. In order to provide a stable energy source, a step-up DC-DC converter must be inserted between the fuel cell stacks and the load. This thesis aims to study a three-phase isolated DC-DC boost converter for low input voltage/high output voltage applications. The studied converter consists of three half-bridge switch legs, three isolated transformers, a three-phase diode rectifier and an output LC filter. The three isolated transformers are of Δ-Y configurations with parallel-connected primary and series-connected secondary windings. Good current sharing performance can be achieved for low voltage/high current primary side. The studied step-up converter has the advantage of high voltage-transfer ratio. A digital controller is in charge of coordinating the gate driving signals among various power converter modules. Combined with the enhanced control area network (ECAN), the output current reference can be adjusted. Therefore, the output power can be suitably distributed according to the CAN BUS module’s command. To ensure the system stability and lifetime of the fuel cell, over-current protection and over-voltage protection are fulfilled. Asymmetrical control schemes are used for driving the power switches.
Finally, a 2-kW three-phase isolated DC-DC boost converter prototype has been built and tested. The input voltage is from 50 V to 100 V, and the output voltage is 380 V. Experimental results are shown to verify the feasibility of the developed system. A high conversion efficiency over 90% can be achieved.

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