本文主要研製一可應用於不斷電系統之轉換器，且將討論雙向半橋轉換器和雙向全橋轉換器之架構差異。雙向全橋轉換器雖可應用於高功率場合，但雙向半橋轉換器成本低，開關數量僅為全橋架構的一半，且不需外加主動開關即可擁有零電壓切換的特性。雙向半橋架構擁有高的功率密度、簡單的控制方法以及小的電流漣波等優點，在中功率的應用中，既可滿足低成本的需求，又可兼顧電池壽命。本文採數位信號處理器晶片 TMS320F28035 作為中央控制器，達到電路數位化之目標。本論文最終完成一台500 W、低壓側電壓為40 V、高壓側電壓為200V、且具零電壓切換之雙向隔離型半橋轉換器，並呈現與討論此原型轉換器的實驗結果，以用於驗證此架構的可行性。

This thesis studies and implements a bi-directional converter for uninterruptible power supply (UPS) systems. Differences between the half-bridge topology and the full-bridge counterpart are discussed. The full-bridge topology is suitable for high-power applications. On the other hand, the half-bridge converter features low circuit cost, high power density, simple control demand and low current ripple. Moreover, the zero-voltage switching (ZVS) can be realized without additional switch. Therefore, the half-bridge topology is preferred for medium-power applications to satisfy the low-cost requirement and long battery life. In this thesis, the digital control is fulfilled by the TMS320F28035 DSP chip. Finally, a ZVS half-bridge isolated bi-directional DC-DC converter with 500-W rated power has been built and tested. The low-side voltage is 40 V and the high-side voltage is 200 V. Experimental results of the prototype converter are shown and discussed to verify the feasibility of the studied scheme.

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