- 學位論文
數位控制式功因修正器之研製
The Implementation of Digital-Controlled Power Factor Corrector
摘要
為了符合法規的須求，交換式電源轉換器的功率因數修正功能更為重要，傳統功率因數修正器是採用類比控制器，因其具有計算功能固定和功能增設困難的缺點，難以整合電源轉換器的需求。因此，本論文研究數位式具功率因數修正功能之交流直流轉換器，採用平均電流法的連續電流控制模式，達成輸出電壓穩定，輸入電流弦波和功率因數高的功能，本論文提出的數位式平均電流法具有效率高(90%)與電流諧波低的優點。為能避免轉換器啟動時的巨大電流，數位控制器附加緩啟動功能，能有效的控制起動電流的最大振幅，可避免電感飽和與MOSFET開關電流過大。 最後，本論文設計完成數位式具有功率因數修正功能之交流直流轉換器，功率500W的轉換器實驗結果，驗證轉換器的直流輸出電壓穩定，輸入電流接近弦波與電壓同相位，功率因數達到0.985，同時具有效率高和輸入電流諧波低的優點，能夠符合產業需求。
並列摘要
In order to fit the regulation, the power factor corrector (PFC) of the power converter is considerably important. The traditional PFC which is based on the analog control IC has the limitation of the fixed function and non-flexible. Therefore, the thesis proposes a new approach based on a digital controller for the PFC. The new average current mode controller is designed for achieving the constant output voltage and the sin waveform input current. The additional function is also added to avoid the fault inrush currents through the inductor and the MOSFET switch. Finally, this paper develops the digital controller for the AC/DC converter. The result of the experiment demonstrates that the 500W converter has the good performance, such as the converter generating the sin wave input current with the power factor 0.985 and the lower total harmonics distortion.