APFC低压系统的研究与实现

针对低压微电网、机床照明、教学实验和建筑工地临时居住等低电压应用场景中非线性整流设备造成的谐波污染,文中采用单周期控制对低压APFC系统进行研究。文中详细分析了单周期控制器UCC28180的控制原理,并对主电路和控制电路的参数进行了设计。通过对平均电流环路和电压环路分析,结合低压系统非线性电流环路增益因子M₁、电压环路PWM斜坡补偿斜率M₂和非线性增益M₃对环路中零极点进行环路补偿,给出了相应的伯德图。通过搭建样机系统,对系统整体效率、功率因数、输入电流总谐波畸变率进行了分析,实验结果表明,该系统符合低压系统的设计要求。

Research and Implementation of APFC Low Voltage System

In view of the harmonic pollution caused by nonlinear rectifier devices in low-voltage application scenarios such as low-voltage micro-grid, lathe lighting, teaching experiment and temporary residence at construction sites, this study investigates the low-voltage APFC system using single-cycle control. The control principle of single-cycle controller UCC28180 is analyzed in detail, and the parameters of main circuit and control circuit are calculated. Based on the analysis of the average current loop and the voltage loop, the loop compensation of the zero-pole in the loop is carried out by combining the nonlinear current loop gain factor M₁ of the low voltage system, the PWM slope compensation slope M₂ of the voltage loop and the nonlinear gain M₃, and the corresponding Bode diagram is given. Finally, the prototype system is established and the system efficiency, power factor, and total harmonic distortion rate of input current are analyzed. The results show that the low-voltage system meets the design requirements.