本文旨在研究適用於電動車快速充電站的充電系統，並以數位控制實現此系統的電能轉換器。本系統的電能轉換器，採用電流饋入式全橋AC-DC功率因數修正器與交錯式降壓型DC-DC轉換器。前級電流饋入式全橋功率因數修正器用以達成高功率因數、低輸入電流諧波目的；後級交錯式降壓型轉換器用以減少輸出電流漣波。此外，本系統使用三階段充電策略以延長電動車鋰電池使用壽命，亦具有電池過充、短路保護以及風扇轉速控制，以提高整體系統使用上的穩定度。本文實作一台規格為輸入電壓300 VAC，輸出電壓400 V，輸出功率為6 kW的高壓電動車充電系統雛形電路，用以驗證此控制方式與架構之可行性。

　　His thesis aims to study a digital-controlled fast charger system for electric vehicle applications. The studied charger system consists of a current-fed full-bridge AC-DC power factor correction (PFC) converter and an interleaved Buck DC-DC converter. The current-fed full-bridge PFC converter is used to achieve high power factor and low input current harmonics. The interleaved Buck converter is implemented to reduce the output current ripple. A three-stage charging scheme is adopted to prolong the battery lifetime of electric vehicles. The over-charging protection, short-circuit protection, and fan-speed control are also realized to improve the reliability. A 6-kW laboratory prototype with system specifications of 300-VAC input voltage and 400-V output voltage was implemented and tested to verify the feasibility.

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