本研究研製一部雙向直流/直流轉換器，電路可分為電力級與控制級兩個部分，電力級架構為四開關降/升壓型轉換器；控制級使用之微控制器為Renesas RX62T。透過回授電路來偵測電感電流與輸入/輸出電壓，並搭配一台雙向直流/交流轉換器，可分為兩種操作模式，分別為一般模式與回充模式。在一般模式下，可將輸入至雙向直流/直流轉換器之能源送至電網；在回充模式下，則透過雙向直流/交流轉換器從電網端買電回來，以穩定直流鏈電壓，如此實現能源回收，達到節能之目的。
在控制方面，本系統使用分切合整數位控制法則(D-Σ digital control)，具有無穩態誤差及更快的動態響應，允許寬廣的電感值變化，將其納入開關責任比率計算。即使電感值隨電流變大而衰減，仍能避免電流發生振盪，使電感電流能準確追蹤電流命令。
本研究主要貢獻為：(1)實作一部雙向直流/直流轉換器，最大功率可達12 kW，輸入電壓380 V，輸出電壓50 V到700 V。於滿載12 kW時之實測效率為95.0 %，(2)轉換器使用分切合整數位控制，可將電感值隨電流變化納入考量，達到定電流與穩壓功能，(3)搭配雙向直流/交流轉換器整合測試，驗證系統之可行性，其可將能量送至電網，藉此達到能源回收再利用，並減少測試時之功率消耗。

This thesis develops a bi-directional dc/dc converter. The circuit can be divided into two parts: power stage and control stage. The power stage architecture is a four-switch buck/boost converter and the microcontroller used in the control stage is Renesas RX62T. Through the feedback circuit to detect the inductor current and input/output voltage, the converter can work with a bi-directional dc/ac converter to recycle the power to grid. It can be divided into two operation modes, namely regular mode and regenerative mode. In the regular mode, the energy input to the bi-directional dc/dc converter can be sent to the grid, and in the regenerative mode, the power can be drawn from the grid through the bi-directional dc/ac converter to stabilize the dc link voltage. In this way, energy recovery is realized and the purpose of energy saving is achieved.
In terms of control, this system uses D-Σ digital control, which has no steady-state error and faster dynamic response, and allows a wide range of inductance variation to be included in the control for switch duty ratio determination. Even under inductor current increase or decrease, the control still can accurately track the current command.
The main contributions of this research are: (1) implementing a bi-directional dc/dc converter with a maximum power rating of 12 kW, input voltage of 380 V, output voltage of 50 V to 700 V, and with the measured efficiency of 95 % under full load of 12 kW, (2) using D-Σ digital control, which can take into consideration the change of inductance value with the current to achieve constant current and voltage stabilization functions, and (3) with a bi-directional dc/ac converter integrated test, verifying the feasibility of the system , which can deliver power to the grid, thereby achieving energy recovery and reducing power consumption during testing.

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