DCM Boost PFC变换器变占空比控制的数字实现方法
宋俊超
（南京理工大学 自动化学院，江苏 南京 210094）
摘 要：分析了变占空比控制的基本原理，推导出该控制算法的占空比表达式，并提出了一种具有恒功率功能的变占空比控制的数字实现方法。基于数字信号处理器MC56F8257对80 W DCM Boost PFC变换器进行了实验验证。实验结果表明，数字变占空比控制可以在较宽的输入电压范围内实现接近于1 的功率因数，输入电流基本无畸变。
关键词：功率因数校正(PFC)；断续模式(DCM)；变占空比控制；数字实现
中图分类号：TM46 文献标识码：A 文章编号：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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