本論文針對高頻化三相交流輸入系統之功率因數修正轉換器，研製應用於VIENNA功因修正轉換器之柔性切換電路，採用相對於整合型架構，具有較高設計彈性之輔助電路，使主開關達到零電壓導通，配合禁能點設計，降低低電流下輔助電路造成之能量損失，提升整體系統效率，並透過緩振電路的設計解決輔助電路中，輔助電感產生的開關電壓應力問題。本文透過軟體模擬及硬體電路的實現，驗證本文架構於各輸入電流下之零電壓導通效果，且最高效率提升為2.5 %。最後基於平均電流控制模式，設計主開關與輔助開關控制，並於電路模擬軟體建置具緩振電路之柔性切換VIENNA 功率因數修正轉換器，根據模擬結果證明本文提出之功率因數修正轉換器，可於300 kHz開關切換頻率下達到零電壓切換效果。

This thesis focuses on the high-frequency power factor correction converters in three-phase AC system applications. To reduce the switching loss at high frequency, a soft-switching VIENNA power factor correction (PFC) converter is purposed, which provided zero voltage switching condition by auxiliary circuit. Furthermore, the problem of voltage stress across the auxiliary switches is solved by the addition of snubber circuit. In addition, the effectiveness of the proposed soft-switching VIENNA scheme has been validated through simulation and experimental results based on a 1 kW, 300 kHz hardware prototype with higher peak efficiency than hard-switching condition over the entire input current range. At last, the main switch and auxiliary switch control based on the average current control mode are designed and the simulation of soft-switching VIENNA PFC converter with snubber circuit are carried out. The simulated results proves that the purposed PFC converter could achieve zero voltage switching at 300 kHz switching frequency.

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