本論文研製一不斷電電源系統，其採用數位控制與類比控制兩種混合方式進行系統功能之實現。其中直流/交流換流器(Inverter) 是以FPGA 做為控制器，達到數位脈波寬度調變(Pulse-Width Modulation, PWM)之控制，並以Verilog 語法撰寫其控制流程後，利用ISE6.3作為開發軟體平台進行語法驗證。在功因修正電路、充電及備用供電則是利用類比控制。並且利用FPGA作為控制充電及備用供電之選擇。在市電正常供電下，經由升壓式功因修正電路提供直流匯流排電壓給換流器，再經換流器提供一110V/60Hz之交流正弦波給負載。此時直流匯流排電壓也對蓄電池充電；在市電異常斷電下，則由蓄電池提供能量至換流器使其能夠維持一穩定的交流正弦波電壓供應給負載。最後，實際製作一600W之不斷電電源系統來驗證本論文理論及設計之正確性。

This thesis proposes an uninterruptible power supply (UPS) system with digital and analog controller to realize this system. The DC/AC inverter uses a field-programmable gate array (FPGA) as a controller to achieve the digital pulse-width-modulation (PWM) control. Then, the verilog hardware description language (VHDL) is used to write the control procedures and ISE6.3 is served as the software development platform to perform syntax testing. Furthermore, the power factor correction (PFC) circuit, the charge circuit, and the spare power circuit are controlled by analog circuits. In addition, the FPGA is used to control the battery charge and spare power circuits. Under the normal utility-line power supply condition, the boost PFC circuit provides DC bus voltage the load and also maintain battery at the highest capacity. While the utility-line power is abnormally interrupted, the batteries supply the energy for the inverter to maintain a stable AC voltage supply for the load system. Finally, a 600W UPS system is implemented to verify the functionalities of the proposed designs.

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