本論文利用現場可規劃邏輯閘陣列(Field programmable gate array, FPGA)作為數位控制器，設計一單相不斷電電源系統，系統採類比/數位混合方式控制。其中類比IC控制升壓式功因修正器，數位式閉迴路之脈波寬度調變(Pulse-Width modulation, PWM)控制方式則控制雙向降∕升壓轉換器(Bi-directional buck-boost converter)和直流/交流換流器(Inverter)。本論文所研製之不斷電電源系統具備有正常運轉與斷電運轉模式。正常運轉時，升壓式功因修正器控制輸入電流與輸入電壓同相達到高功因，再由換流器將能量傳送給負載，匯流排電壓經雙向式降壓轉換器對電池充電；當市電斷電時，由電池升壓後經換流器將能量傳送給負載。最後以Xilinx Spartan-II-XC2S200實現數位控制器，完成600VA不斷電系統，以驗證本論文之理論及設計的正確性。

　　The design and implementation of a FPGA-based uninterruptible power supply (UPS) system is proposed in this thesis. The controller for the UPS system adopts analog and digital means. The analog IC is used to control power factor correction and the FPGA digital controller is employed to control the bi-directional buck-boost converter and DC/AC inverter. Under the normal AC line operation mode, the power factor correction circuit forces the input current to follow the input voltage to achieve high power factor. The output of power factor correction circuit is then fed to the load through a DC/AC inverter and the battery is charged simultaneously via bi-directional buck-boost converter. During the utility power failure condition, the battery of voltage is boosted through bi-directional DC/DC converter and then transferred to the load by DC/AC inverter. Finally, Spartan-II-XC2S200 FPGA is employed to realize a 600VA UPS and the experimental results are performed to verify the theoretical discussion.

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