近年來，由於系統對兩個直流匯流排之間和直流匯流排與電池之間能量傳遞能力的需求用來越大，雙向直流-直流轉換器受到了很大的關注。除了傳統不斷電系統的應用，雙向直流-直流轉換器也用在許多新的應用，例如：再生能源系統、燃料電池能源系統和油電混合動力車。在本論文中提出了利用工作週期和相移控制演算法的策略並應用在雙向降壓升壓轉換器上。雖然類比IC能成功的使用在許多應用，但是卻受限於多功能操作狀況的應用和很複雜的控制策略上，類比IC是無法達成的。除此之外，本論文亦利用數位訊號處理器開發了數位控制策略。利用比例積分控制器來調整工作週期，同時利用功率來計算相位移。利用數位控制，可以應用更複雜的控制策略來改善電路效率及功率密度。
本論文研製一5 kW之雙向降壓升壓轉換器來證明其控制策略之可行性，並提出降壓模式與升壓模式的實驗結果。

Bidirectional DC-DC converters have recently received a lot of critical attention due to the increasing needs for systems capable of transferring power between two dc buses or between dc bus and battery storage. Apart from the traditional uninterruptible power supply (UPS) applications, bidirectional DC-DC converters are also used in many new applications such as renewable energy system, fuel cell energy system, and even hybrid electric vehicle. In this thesis, a bidirectional buck-boost converter with both duty ratio and phase shift control algorithm is proposed. Although analog ICs are successfully applied in many applications; the limited adaption to versatile operation conditions and difficulty on fulfilling sophisticated control scheme preclude analog solutions from the consideration list. Instead, the digital control solution based on digital-signal processor (DSP) is exploited in this thesis. The duty ratio is modulated by PI controller; while the phase shift is adjusted by power requirement calculation. With digital control, more complex control scheme can be implemented to improve the efficiency and also power density.
A 5kW bidirectional buck-boost converter is implemented to verify the feasibility of the control strategy. The experimental results show the performance of the proposed circuit both in buck mode and boost mode.

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