数字控制的CCM Boost PFC变换器的实现方法

Realization of CCM Boost PFC Converter Based on Digital Control

摘要: 基于平均电流控制的基本原理，推导了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。基于数字信号控制器MC56F8257对300 W CCM Boost PFC变换器进行了实验验证。实验结果表明，数字控制可以在较宽的输入电压范围内实现接近1的功率因数，输入电流的畸变很小。

Abstract: Based on the basic principle of average current control, the duty cycle expression of the control algorithm is derived, and a digital realization method of variable duty cycle control with constant power is proposed in this paper. The 300 W CCM Boost PFC converter is experimentally verified based on digital signal controller MC56F8257. The experimental results show that the digital control can achieve a power factor close to 1 in a wide input voltage range, and the distortion of input current is very small.