本論文主旨為研究雙主動全橋式轉換器，針對使用三重相移控制法之寬輸出電壓範圍轉換，進行全輸出功率範圍效率最佳化與演算法改善。本文將深入探討三重相移控制法之原理、動作方式、模式定義與不同模式下之轉移函數與電路特性分析，並且介紹最小峰值電流控制法及最小有效值電流控制法等效率最佳化之演算法原理與數學推導；其中，針對最小峰值與有效值電流控制法在特定功率以下無法達到全範圍零電壓切換的缺失，提出一新控制策略，使轉換器能於全範圍達成零電壓切換。最後，以寬範圍輸出電壓之規格設計功率元件，並實作最大輸出功率為15 kW之雙主動全橋式轉換器。並利用德州儀器所開發之數位信號處理器實現演算法閉迴路控制，以實測結果和理論相互印證。

An optimal modulation scheme with triple-phase-shift (TPS) control that increase efficiency in the whole load range is presented for a Dual active bridge (DAB) converter under wide output voltage range conditions. This thesis provides a comprehensive analysis of the DAB with TPS modulation, identifying all the switching modes to operate the DAB where expressions for the transfer functions, the peak inductor current and RMS inductor current are provided. An analysis of Minimum Peak Current and Minimum RMS Current Control also are investigated, on this basic, All-ZVS modulation scheme is originally proposed to improve light-load efficiency and reducing the switching loss. A 15 kW prototype circuit is applied, and experimental results are presented to validate that the modulation and efficiency improvement are realized by applying the optimized modulation scheme. The experimental results also verify the effectiveness of the closed-loop control strategy.

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