DCM Boost PFC變換器變占空比控制的數字實現方法
宋俊超
（南京理工大學 自動化學院，江蘇 南京 210094）
摘 要：分析了變占空比控制的基本原理，推導出該控制算法的占空比表達式，并提出了一種具有恒功率功能的變占空比控制的數字實現方法。基于數字信號處理器MC56F8257對80 W DCM Boost PFC變換器進行了實驗驗證。實驗結果表明，數字變占空比控制可以在較寬的輸入電壓范圍內實現接近于1 的功率因數，輸入電流基本無畸變。
關鍵詞：功率因數校正(PFC)；斷續模式(DCM)；變占空比控制；數字實現
中圖分類號：TM46 文獻標識碼：A 文章編號：1007-3175(2017)04-0031-04
Digital Realization Method of Variable Duty Ratio Control for Discontinuous
Current Mode Boost Power Factor Correction Converters
SONG Jun-chao
（School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: This paper analyzed the basic principle of variable duty ratio control, derived the expression of duty ratio of this control algorithm and proposed a kind of variable duty ratio control digital implementation method with constant power functions. The experimental verification of discontinuous current mode (DCM) Boost power factor correction (PFC) 80 W converter was carried out based on the digital signal processor MC56F8257. The experimental results show that the digital variable duty ratio control can achieve a power factor close to 1 in a wide range of input voltages and the input current is almost no distortion.
Key words: power factor correction; discontinuous current mode; variable duty ratio control; digital realization
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