雙開關返馳式轉換器跟單開關架構一樣，都具有電路拓樸簡單、成本低廉、電氣隔離與同時可多組輸出的特性。但雙開關架構由於能夠提供漏感上的電流之能量回復路徑，除能降低振鈴產生外，也會提高電路的轉換效率，而且可採用較為便宜、適於低電壓操作的功率開關，所以也被廣泛地應用。
本論文首先針對雙開關返馳式電源轉換器在進行切換操作時，建立各操作狀態所對應的電路模式，並予以分析，同時獲得各電路模式的動態方程式。其次推導出耦合電感器一次側繞組的臨界電感、輸出電容及各相關數學模式，藉以求算出此兩關鍵元件之參數值大小。本文接著利用Pspice模擬軟體進行電路模擬，並實作一電路雛型測試，由模擬、實測之各相關電壓、電流波形，可驗證前述理論分析的正確性。其中不只在CCM操作情況，即使在CCM/DCM臨界操作點上，動態方程式也都能夠完全吻合轉換器的操作特性。

Like single-switch architecture, the dual-switch flyback converter also has the same characteristics, including simple circuit topology, low cost, electrical isolation and multiple outputs. Moreover, due to the dual-switch flyback converter providing an additional current return path, it will reduce the ring effect and enhance the circuit conversion efficiency, and it is suited to use for the low-voltage and low-cost power switches. Therefore, the dual-switch topology is also widely used.
This dissertation presents the circuit analysis and design considerations for the dual-switch flyback converter. The operation modes are individually analyzed and the corresponding dynamic equations are presented accordingly. Also, the design criteria for key components are derived. Good agreement can be obtained among the Pspice simulation, the experimental results and the theoretical analysis. The analytic equations are valid not only for continuous-conduction-mode condition, but also for critical mode operation, which meet the design specifications.

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