本論文針對三相交直流轉換器架構進行拓樸研究並且加以實現，採用阻抗源(以下通稱為Z-source)架構搭配傳統三相六開關電路，達到在單級架構下便可升降壓的功能。傳統電壓源或是電流源換流器的輸出電壓只能小於或大於輸入電壓；而阻抗源架構運用電感、電容以及一個輔助開關，使得輸入端看來既非電壓源也非電流源，因而輸出電壓可升可降。此外，由於沒有電壓源短路或電流源開路的潛在危險，阻抗源電路的可靠度較佳。在不同模式下，新加入的輔助開關可在被動模式下工作，使得控制機制相對簡單，其控制方法也是基於傳統架構的控制法則的延伸。本論文最後完成一台輸入電壓為150 V 與200V、輸出電壓為110 Vrms、輸出功率為500 W 的三相交直流轉換器。經過測試，結果證實可以達到單級升降壓的效果。

In this thesis, the topology of three-phase AC-DC converters is studied. An impedance source (Z-source) topology together with traditional three-phase six-switch circuit to achieve the buck/boost function in single-stage structure. Traditional voltage source or current source inverter has the limitation that output voltage can only be less than or greater than the input
voltage. The impedance source topology has combination of inductors, capacitors, and one auxiliary switch. The input port is neither a voltage source nor a current source. Therefore, the output voltage can be either higher or lower than the input. Besides, eliminating the potential hazard of short-through or open-circuit in voltage-source or current-source circuits,
Z-source circuit possesses better reliability. In one of the two operation modes, the auxiliary switch can be passively mode, resulting an easier control mechanism. The control algorithm for a Z-source can be an extension based on convention control algorithm. This thesis implements a three-phase Z-source AC-DC converter with input voltage of 150 V and 200 V, output voltage of 110 Vrms and 500 W output power. According to the test results, it is confirmed that the effect can be buck/boost in single-stage structure.

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