摘要
针对大规模电动汽车充电功率因数较低,谐波对电网污染严重,系统效率低、充电速度慢,不能满足电动汽车充电要求的特点,设计采用了一种前级带Boost-PFC的LLC谐振电源和后级为双向DC-DC的电路拓扑结构。针对功率因数低,采用单周期控制方法实现功率因数校正;利用在高频变压器副边添加电容和变压器漏感间的谐振,达到LLC谐振以减小开关损耗;采取正负脉冲双向DC-DC电路来加快充电速率。在Matlab和PSIM仿真验证了该设计能够实现电源变换电路开关元器件的零电压开通,且可以缩短充电时间,使网侧电流谐波畸变率小于5%,功率因数达到0.975。仿真验证了该设计在高功率因数和快速性方面达到了预期,对于汽车电池的应用有很好的效果。
For large-scale electric vehicle charging low power factor,harmonic pollution on the grid,low system efficiency,charging slow and can not meet the requirements of electric vehicle charging,designed using LLC resonant power supply and the latter with the former level of Boost-PFC level two-way DC-DC circuit topology.For low power factor,single-cycle control method to achieve power factor correction;the use of high-frequency transformer secondary side resonant capacitor added between the transformer leakage inductance,reaching LLC resonant to reduce switching losses;take the positive and negative pulse bidirectional DC-DC circuit to speed up the charging rate.The results show that PSIM simulation in Matlab and the design of the power conversion circuit to achieve zero-voltage switching components,and can make the charging time is shortened,line current harmonic distortion of less than5%,the power factor can reach 0.975.Simulation results show this design to achieve the desired high power factor and rapidity,with good results in battery.
作者
解文鹏
安雨伦
郑智聪
XIE Wenpeng;AN Yulun;ZHENG Zhicong(Faculty of Medical Technology,Shaanxi University of Traditional Chinese Medicine,Xianyang 712046,China;Fengxi Branch of Xixian New Area of Shaanxi Power Supply Company of State Grid,Xi’an 710048,China;Faculty of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,China)
出处
《电子设计工程》
2021年第4期93-96,101,共5页
Electronic Design Engineering
关键词
汽车电池
正负脉冲快速充电
单周期控制
LLC谐振开关
power battery
positive and negative pulse fast charge
single-cycle control
LLC resonant switching
