本論文主旨為研究三主動全橋式轉換器，應用於不斷電系統。首先對雙主動全橋式轉換器與三主動全橋式轉換器分析其架構，並深入探討不同相移控制法對轉換器表現之成效。為驗證零電壓切換範圍，故選擇擴展相移控制，深入探討其控制法之原理、動作方式及功率傳遞函數並應用至三主動全橋式轉換器，觀察是否達到零電壓切換及改善輕載效率之成效。
參考市售之不斷電系統規格，最終實際完成一台輸入電壓為170 Vdc至280 Vdc、輸出電壓為360 Vdc以及輸出功率為8 kW的直流-直流三主動全橋式轉換器。採用單相移控制與擴展相移控制，控制轉換器功率的傳遞大小，且分別觀察於不同控制法下，電路零電壓切換之情形。經由實驗結果顯示轉換器在不同輸入電壓之條件下，所採用之相移調變法能有效提升輕載效率，並以理論與實測結果相互印證。

The main purpose of this thesis is to study the triple active bridge converter, which is applied to an uninterruptible power system. Analyze the structures of dual active bridge converter and triple active bridge converter. Discussed different phase shift control methods on the converter’s performance. To verify the range of zero-voltage switching, extended-phase-shift control is selected. Comprehensive analysis of operation mode, and power transfer function for triple active bridge converter. To observe whether zero-voltage switching is achieved and light-load efficiency is improved.
The converter refers to the specification of an uninterruptible power system and completes a triple active bridge converter with an input voltage of 170~280 Vdc, two output voltages of 360 Vdc, and an output power of 8 kW. Using single phase shift control and extended-phase-shift control method to control the power delivery and observe zero-voltage switching situations under different control methods. The experimental results present that the modulation method can effectively improve the light-load efficiency under different input voltage conditions.

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