本論文主要為研製一單級三相高功因交流-直流轉換器，此電路為三相交流-直流降/升壓轉換器及直流-直流降/升壓轉換器之整合電路，前半級電路做為功率因數修正；而後半級電路則為降壓轉換之用。本電路可達到單位功率因數校正之效果，且具架構簡單及控制容易之優點。論文中首先簡介傳統三相功率因數修正電路架構，並分析所提出電路架構特性及動作原理。最後實作一500W單級化電源供應器，輸入線電壓為200 10%Vrms，輸出為直流48V，以驗證系統之特性。

In this thesis, a single-stage high power factor three-phase AC-DC converter is proposed. The proposed converter is composed of a three phase AC-DC buck/boost converter integrated with a DC-DC buck-boost converter. The front semi-stage circuit is used for power factor correction and the rear semi-stage circuit is used for DC-DC conversion. The proposed converter can achieve unity power factor with a simple control and structure. The operation principles and characteristics of the proposed converter are discussed. Finally, the single-stage power supply of 500W is performed with a line input voltage of 200 Vrms 10% and DC output 48V/500W is performed in the laboratory to verify the feasibility of the proposed converter.

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