抑制图腾柱PFC电流过零尖峰控制方法的研究  

Research on control method of suppressing the zero crossing peak of totem pole PFC current

作　　者：杨洋 谢明 YANG Yang;XIE Ming(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海200093

出　　处：《电子设计工程》2024年第13期50-54,59,共6页Electronic Design Engineering

基　　金：国家重点研发计划项目(2018YFB0106300)。

摘　　要：针对工作在CCM模式下的图腾柱拓扑PFC在电压过零点处电流的畸变问题,在详细阐述图腾柱PFC的工作原理及过零电流尖峰产生原因的基础上,提出一种改进型的过零控制方式,在输入电压过零时刻前后插入死区为低频开关管反向恢复提供时间。在死区时段后对高频开关管施加渐进占空比信号,以完成对低频桥臂的寄生电容上电压释放,并降低过零电流尖峰。控制策略采用基于占空比前馈平均电流控制原理的双闭环控制,提高电流对电压的动态响应能力。基于上述方法,搭建了一台交流输入电压220 V,直流输出电压400 V,满载2 kW的实验样机并进行实验研究。实验结果表明,样机峰值效率可达98.3%,满载时功率因数高达0.99。In view of the current distortion at the voltage zero-crossing point of the totem pole topology PFC operating in CCM mode,an improved zero-crossing control mode is proposed based on the detailed description of the working principle of the totem pole PFC and the causes of the zero-crossing current spike.The dead zone is inserted before and after the input voltage zero-crossing time to provide time for the reverse recovery of the low-frequency switch.After the dead time period,apply the progressive duty cycle signal to the high-frequency switch to complete the voltage release on the parasitic capacitance of the low-frequency bridge arm and reduce the zero-crossing current spike.The control strategy adopts double closed-loop control based on duty cycle feedforward average current control principle to improve the dynamic response of current to voltage.Based on the above methods,an experimental prototype with AC input voltage of 220 V,DC output voltage of 400 V and full load of 2 kW was built and experimental research was carried out.The experimental results show that the peak efficiency of the prototype can reach 98.3%,and the power factor can reach 0.99 at full load.

关 键 词：图腾柱 功率因数校正 连续导通模式 过零电流尖峰 平均电流 

分 类 号：TN702[电子电信—电路与系统]