一种图腾柱PFC的控制方法及Simulink仿真

摘要

Focused on the control of switching devices in totem-pole PFC′s main circuit,a new control method is presented. The purpose of the method is to effectively control totem pole PFC main circuit,achieve reducing total harmonic distortion and improve the power factor. The control method is based on the PWM tracking con-trol,and the curve fitting method is used to stabilize output voltage under different supply voltages. In order to verify the validity of the control method,the main circuit model and control circuit model are built with MAT-LAB/Simulink,then simulated and finally conducted FFT analysis of the current waveform. Results show that the Totem-pole PFC using the control system can get good electrical performance theoretically.%针对图腾柱PFC主电路的开关器件控制,提出了一种新的控制方法,目的是有效控制图腾柱PFC主电路,实现降低谐波含量和提高功率因数.该控制方法基于PWM跟踪控制的思想,且使用了曲线拟合的方法,实现了在不同的电源电压下稳压输出的功能.为了验证该控制方法的有效性,使用MAT-LAB的Simulink仿真工具,搭建主电路和控制电路模型进行仿真.对仿真得出的电流波形进行FFT分析,结果显示,使用该控制系统的图腾柱PFC理论上能够得到很好的电气性能.