傳統昇壓型功率因數校正器於高功率應用時，全橋整流二極體會造成相當大的功率損失。本論文研製一數位控制之無橋式昇壓型功率因數校正器，以數位訊號處理器實行平均電流控制模式，使輸入電流追隨輸入電壓達到高功率因數及低輸入電流失真。論文首先針對功率因數校正器的種類與控制方法進行探討，分析無橋式昇壓型功率因數校正器的動作原理，探討相關重要元件之參數設計，說明數位訊號處理器實現平均電流控制模式之流程，及電壓外迴路與電流內迴路與補償器設計。最後，以數位訊號處理器研製一輸入電壓90-264 Vrms，輸出電壓為400 V，最大功率1300 W之輸出定電壓無橋式功率因數校正器以驗證控制器設計之可行性。最大效率為98.1%，PF最高為0.996，iTHD最低為5.1%。

When conventional boost power factor corrector (PFC) circuit operates in high power application, rectifier bridge diode causes high power loss. A bridgeless PFC circuit with digital signal processor (DSP) control is implemented in this thesis. Average current mode is implemented by DSP and the input current follows the input voltage.Therefore, the PFC converter achieves high power factor and low total harmonic distortion current. Types of PFC converter and the methods of control are discussed. The operating principle of semi-boost PFC converter is analyzed and the parameters of key components are design. The software of average current mode control in DSP is described. Outter voltage loop, inner current loop and the design of the compensator are introduced. Finally, a 1.3 kw bridgeless PFC circuit with DSP control is implemented. Input voltage range is 90 Vrms ~ 264 Vrms and output voltage is constant 400 V. Maximum efficiency is 98.1%. Maximum power factor is 0.996 and minimum iTHD is 5.1%.

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