摘要
某款电动汽车直流充电试验中,个别直流快充桩给整车充电时偶发充电中断的故障。该文通过试验排查和仿真分析相结合的方法,锁定了引起故障的原因。在试验排查阶段,确认了电池管理系统(BMS)主板上高压继电器的驱动芯片复位管脚,受到来自直流充电桩地线的电磁干扰,导致异常复位引发充电中断故障。并对敏感源的BMS主板PCB进行有效电磁兼容性能仿真分析和评估,从故障形成机理入手优化、提升主板电磁抗干扰性能,满足BMS在电动汽车复杂电磁环境中的使用要求。改进后,整车直流快充试验中没有再发生类似故障,进一步确认整改措施的有效性,为后续电动汽车直流充电故障和EMC问题的定位整改提供了工程经验。
During the process of DC charging test of the electric vehicle,one of the charging piles occasionally interrupted when charging the electric vehicle.Through the combination of test inspection and simulation analysis,the root cause of electromagnetic interference was found.In the test,it was confirmed that the reset pin of the drive chip on the BMS main board was abnormally reset due to the electromagnetic interference from the ground wire of the DC charging pile.Optimize from the fault formation mechanism,improve the electromagnetic anti-interference performance of the main board,and meet the use requirements of BMS in the complex electromagnetic environment of electric vehicles.After the improvement,no similar fault occurred again during the DC charging test of electric vehicle,the effectiveness of the improvement was further confirmed,which provided engineering experience for the positioning and rectification of the DC charging fault of the subsequent electric vehicle and the EMC problem of the PCB board.
作者
李建群
魏丹
朱林培
Li Jianqun;Wei Dan;Zhu Linpei
