本論文提出一具功率因數修正新型三相交/直流升降壓轉換器，使用較少開關及二極體，以改善整體的轉換效率。其中，中性點連接輸入電容之架構可降低主開關之電壓應力，進一步地減低轉換器的成本及體積。在本論文中，轉換器之工作原理及穩態分析係以降壓、升壓模式各別探討，並提出重要元件的設計準則，作為實作之根據。本論文實現一實體電路，以額定功率為800W及300W，各別驗證升壓模式及降壓模式之可行性。實作結果顯示，相較於其他所參考之升降壓轉換器而言，本論文提出之轉換器具有92.9%較高的轉換效率及趨近於1的功率因數。

A new three-phase AC-DC buck-boost converter with power factor correction (PFC) is proposed in this thesis. The proposed converter uses fewer switches and diodes to improve the efficiency of circuit. Furthermore, the voltage stresses of the main switches are reduced with input capacitors connected to the neutral point to further reduce the size and cost of the proposed converter. In this thesis, operation principles and steady-state characteristics of the proposed converter are described and discussed for both buck and boost operating modes, respectively. Moreover, design guidelines of the key components used in the circuit are then given to facilitate the circuit implementation. Finally, a prototype circuit of 800W at boost mode and 300W at buck mode is implemented to verify the proposed converter. The experimental results show that the proposed converter achieves the better efficiency 92.9% and near unity power factor as compared with the referenced buck-boost converters.

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