本論文主要探討與研製一應用於醫療診斷用X光機之高壓電源轉換器。此電路架構主要由全橋共振式換流器與多組全波倍壓電路所組成，其控制方式係採用相移式脈波寬度調變技術，利用改變相移角度以達到所需之高壓，此電路適用於大範圍的負載變化，並針對所提之架構進行動作原理分析與理論推導。於高壓應用之場合中，變壓器其繞組之匝數相當高，因此繞組間之絕緣與雜散元件必須加以考量。最後，將本文之電路實際應用於X光管上，完成輸入電壓400 V，輸出電壓50~70 kV，輸出功率50~100 W之電路雛形，並以實驗結果驗證理論之可行性。

In this thesis, a high voltage converter is studied and implemented for X-ray tube applications. This circuit is mainly composed of full-bridge resonant inverter and multi-units of full-wave voltage-doublers that utilize phase-shift control to regulate the output voltage. The operating principle and theory of the proposed converter are presented. Since the high voltage transformer have many winding, the isolation and stray components must be considered in the circuit analysis. Finally, the proposed high voltage converter is a practical application to X-ray tubes, a laboratory prototype with 400 V input and 50-70 kV/50-100 W output is implemented to verify the theoretical analysis.

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