本論文針對高頻化三相系統之功率修正因數轉換器，研究三相四線高頻VIENNA功率因數修正轉換器，其利用寬能隙半導體元件減少高頻切換損失，並採用輔助電路應用於VIENNA功率因數修正轉換器，使主開關達到柔性切換，提升整體系統效率。其分別針對原VIENNA功率因數修正轉換器與具緩振柔性切換VIENNA功率因數修正轉換器架構進行模式分析，設計其硬體電路及輔助電路，且基於平均電流控制模式下，設計其主開關與輔助開關控制。透過模擬軟體與硬體電路實現三相四線高頻VIENNA功率因數修正轉換器與單相高頻具緩振電路柔性切換VIENNA功率因數修正轉換器。經由實驗，整體電路系統可達三相10 kW輸出功率，於500 kHz硬切換下，系統效率峰值可達96.3 %，並於單相3.3 kW額定輸出功率，500 kHz柔性切換下，實驗結果驗證具緩振柔性切換架構於各輸入電壓之零電壓導通實驗下，效率最高改善2.73 %。

This thesis focuses on the power factor correction (PFC) converter for high-frequency three-phase systems and develops a three-phase four-wire high-frequency VIENNA PFC converter. The converter utilizes wide bandgap semiconductor devices to minimize high-frequency switching losses and incorporates an auxiliary circuit to achieve soft-switching of the main switches, thereby improving the overall system efficiency. The analysis includes the evaluation of the operation mode of both the original VIENNA PFC converter and the VIENNA PFC converter with a snubber soft-switching structure. Hardware and auxiliary circuits are designed for these converter architectures, and control of the main and auxiliary switches is based on the average current control mode. The designed converters are implemented using simulation software and hardware circuits. Experimental results demonstrate that the overall system can achieve an output power of 10 kW for three-phase operation at a hard-switching frequency of 500 kHz, with a peak system efficiency of 96.3%. Additionally, experiments validate that the soft-switching and snubber structure, in zero-voltage turn-on experiments for various input voltages, results in a maximum efficiency improvement of 2.73% for a single-phase 3.3 kW rated output power at a soft-switching frequency of 500 kHz.

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