一種PFC變換器輸入電壓前饋控制方法

摘要：功率因數校正(PFC)變換器輸入電壓有效值前饋控制算法計算量大，且存在輸入電流畸變現象。本文詳細分析了PFC變換器輸入電流在輸入電壓過零點附近產生畸變的原因，指出PFC變換器輸入電流超前于輸入電壓是導致輸入電流畸變的主要原因。通過一種輸入電壓前饋控制算法，簡化了控制算法并提高了DSP的工作效率，改善了PFC變換器輸入電流畸變現象。仿真結果證明了本文所提出的方法的有效性，特別是提高了PFC變換器對輸入電壓的響應速度。 敘詞：功率因數校正 輸入電壓前饋 相位差 數字控制 Abstract： Feedforward control arithmetic calculation load of PFC input voltage effecive value is huge, and there exists input current distortion. The article discusses in detail the reasons of input current distortion after the input voltage of PFC convertor passes zero point, pointing out that the major reason for input current distortion is that the input current of PFC convertor advances before the input voltage. By an input voltage feedforward control arithmetic, the control arithmetic is simplified , the efficiency of DSP is improved and the input current distortion of PFC convertor is mended. Simulation experiments prove that the strategy provided by this article is effective. In particular, the PFC convertor response speed to input voltage has been significantly improved. Keyword：Input voltage feedforward, Phase difference, Digital control