本論文主要研製一部應用於高壓電容放電之寬輸入電壓範圍直流電源供應器。功率級架構分為兩級，前級為疊接降壓型轉換器，用以將40 V~5 kV 輸入電壓轉換成後級電路所需輸入電壓；後級為全橋串聯諧振式轉換器，用以提供400 V/500 W 電壓輸出，最高效率可達87.35%。控制方面使用德州儀器所開發的數位信號處理器晶片TMS320F28035，以實現數位控制。本論文內容包含主電路操作原理與設計考量，最後研製之雛型電路由實驗結果驗證其可行性。

This thesis mainly develops a DC power supply with wide-range input voltage for high voltage capacitor discharge. The power stage consists of a cascode buck DC-DC converter and a full-bridge series resonant converter. The pre-stage cascode buck converter is operated to achieve the proposed voltage adjustment from 40 V~5 kV and provide the input voltage for post-stage converter. The post-stage circuit is a full-bridge series resonant converter, which provides 400 V/500 W output voltage, and the maximum power efficiency can be 87.35%. A DSP chip TMS320F28035 developed by Texas Instruments is adopted for realizing digital controller. In this thesis, the operation principles and design considerations for a prototype system were analyzed and discussed. Experimental results of the prototype converter are shown to verify the feasibility of the studied scheme.

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