本文實際和設計研製一數位控制非隔離雙向直流-直流轉換器，所
提出的轉換器在所有方向均可以操作在降壓模式或是升壓模式，透過新
型調變策略和適當的設計降升壓電感感值以達到主開關零電壓切換操
作，以提高效率。為了進一步提升效率，提出了自適應相移的控制方法，
根據負載的大小決定閘極訊號之間的相移角度。本文使用一個低成本的
數位訊號控制器dsPIC33FJ16GS502 來實現電力潮流控制、調節直流匯
流排電壓和自適應相移控制，此調變策略是基於軟體的解決方式，不需
要額外附加電路，因此易於實現並且降低不穩定性和雜訊敏感度的問題。
為了驗證所提出方法的正確性與有效性，實作了一台300 W 原型電路。
根據實驗測試結果，在不同負載下所有操作模式的測量效率均在90 %
以上。

In this thesis, a digitally-controlled non-isolated bidirectional buck–
boost dc–dc converter is studied and implemented. The proposed converter
is capable of operating in all power conditions in buck/boost modes.
Through a novel modulation strategy and proper design of the buck-boost
inductance, zero voltage switching (ZVS) can be achieved and thus high
efficiency can be obtained. To further improve the efficiency, an adaptive
phase-shift control method which determines the phase shift between gating
signals according to the load level is also proposced. A low cost digital
signal controller dsPIC33FJ16GS502 is adopted in this thesis to realize the
power flow control, DC-bus voltage regulation and adaptive phase shift
control. As the modulation strategy is a software-based solution, there are
no requirement of additional circuits; therefore, it can be easily
implemented and reduces instability and noise susceptibility problems. To
validate the correctness and the effectiveness of the proposed method, a 300
W prototyping circuit is implemented and tested. According to the
experimental results, the measured efficiencies of all operating modes under
different loads are all higher than 90%.

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