具有低输出电流纹波的高功率因数Cuk PFC变换器  

High power factor Cuk PFC converter with low output current ripple

作　　者：周国华[1] 田庆新 冷敏瑞 阎铁生 曹太强 ZHOU Guo-hua;TIAN Qing-xin;LENG Min-rui;YAN Tie-sheng;CAO Tai-qiang(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China;School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 611039,China)

机构地区：[1]西南交通大学电气工程学院,成都611756 [2]西华大学电气与电子信息学院,成都610039

出　　处：《电机与控制学报》2019年第12期32-41,共10页Electric Machines and Control

基　　金：国家自然科学基金(61771405,61371033);成都市科技局项目(2016-HM01-00139-SF)

摘　　要：工作于输入电感电流断续模式的Cuk功率因数校正(PFC)变换器,在半个工频周期内占空比恒定时,其输入电流存在谐波畸变,功率因数(PF)较低。针对此问题,研究了工作于输入电感电流断续模式、输出电感电流连续模式的Cuk PFC变换器。通过推导输入电流和PF值的表达式,设计了一种基于变占空比控制的Cuk PFC变换器,可保证在宽输入电压范围内使PF值接近于1,且减小器件的电流应力。通过占空比拟合的方法简化了控制电路的设计。充分利用了Cuk变换器输出电流无脉动、纹波小的特点,实现了低纹波的恒流输出。最后,通过仿真和实验对定占空比控制的Cuk PFC变换器与提出的变占空比控制Cuk PFC变换器进行了性能对比,验证了理论分析的正确性。Cuk power factor correction(PFC)converter in discontinuous input inductor current mode features zero-current turn-on for the switch and simple designing for control circuit.However,input current has harmonic distortion and the power factor(PF)is relatively low when the duty ratio is constant within one half of the line cycle.The expressions of the input current and PF of discontinuous input inductor current mode and continuous output inductor current mode of Cuk PFC converter were derived,and based on which a variable duty ratio control of Cuk PFC converter was designed to improve the PF nearly up to one during the whole input voltage range and reduce the current stress of the devices.The designing of control circuit was simplified by fitting the duty ratio Moreover,the low ripple and no pulsation character of output current in Cuk converter were utilized to obtain the constant current output.Finally,the performance of the constant duty cycle control Cuk PFC converter was compared with that of the proposed variable duty cycle control Cuk PFC converter through simulation and experiment,which verifies the correctness of the theoretical analysis.

关 键 词：CUK变换器 功率因数校正 变占空比控制 低输出电流纹波 

分 类 号：TM46[电气工程—电器]