本論文針對一高降壓比電能轉換器進行開發研究，將磷酸鋰鐵電池的高壓輸出，轉換成低壓直流輸出提供電動車之電子裝置使用。此電路係採用交錯式耦合繞組降壓轉換器，其利用增加耦合繞組設計高降壓比電路，達成高效率之特性目標。本論文已實現與測試高效能轉換器之實驗雛型電路，並進行模擬及實驗結果討論以驗證所研究架構的可行性。採用數位信號處理晶片dsPIC33FJ06GS202 實現轉換器電路之數位控制器，以提高系統之可靠性與可擴充性。雛型電路的規格為輸出功率100W、操作頻率100kHz、輸入電壓120V、輸出電壓12V。

This thesis is to conduct a high performance and high step-down DC/DC converter. A high performance digital power supply is studied to draw energy from the high-voltage LiFePO4 battery to provide a low-voltage DC voltage for electronic circuits in electric vehicles. The presented is an interleaved coupled inductor synchronous buck converter. High conversion efficiency can be achieved by the coupled inductor design for high step-down applications. Simulations and experimental results are discussed and compared to verify the feasibility of the studied schemes. The proposed converter is controlled by a DSP chip dsPIC33FJ06GS202, which is used to realize the digital controller for raising the system reliability and flexibility. A laboratory prototype with 100 W rated power has been built and tested. The switching frequency is 100 kHz, input voltage is 120 V and the output voltage is 12V.

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