本論文旨在研製以數位控制實現具有高功因、高效率的無橋升壓型主動式功率因數修正電路，以適合高功率的電流饋入全橋式架構達成電氣隔離目的，且採用固定切換頻率及平均電流控制模式，以降低輸入電流諧波失真使輸入電流與電壓同相位，達成高功率因數與提高轉換效率之目的。電路以德州儀器TMS320X28035微處理器為控制核心，數位式控制相較於傳統類比式控制電路具備可程式化、彈性設計、高可靠度且不易隨溫度變化影響等優點。本論文中使用數位比例-積分控制器來設計回授補償控制，達成所需之相位和增益。最後實作一台1.2 kW單級無橋電流饋入全橋式升壓型主動功率因數修正器，其輸入交流電壓為AC220 V，輸出電壓為330 V，最大輸出電流為3.63 A。

This thesis presents the design and implementation of a digitally-controlled bridgeless boost power factor corrector (PFC) with high power factor (PF) and high efficiency. The current-fed isolated full-bridge converter suitable for high-power applications is adopted. Fixed switching frequency and average current mode control are used to reduce input current harmonics and reshape the input current to be sinusoidal and in phase with the input voltage. Therefore, high power factor and conversion efficiency can be fulfilled. A TI DSP chip, TMS320F28035, is applied as the main controller. Compared with its analog counterpart, a digital controller features flexibility through programmability, higher reliability, and better noise and temperature immunity. In this thesis, a digital PI (Proportional-Integral) controller is designed as a feedback compensator to achieve the required phase margin and gain margin. Finally, a 1.2-kW single-stage bridgeless current-fed full-bridged PFC with input voltage of AC 220 V, output voltage of 330 V, and output current of 3.63 A is implemented.

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