不同屏蔽措施对电磁干扰抑制的研究  

Research on EMI suppression with different shielding measures

作　　者：张浩[1,2] 陈良亮[1,2] 齐连伟 王念春[3] 陈中[3] 黄学良[3] ZHANG Hao;CHEN Liangliang;QI Lianwei;WANG Nianchun;CHEN Zhong;HUANG Xueliang(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;NARI Technology Development Limited Company,Nanjing 211106,China;School of Electrical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏南京211106 [2]国电南瑞科技股份有限公司,江苏南京211106 [3]东南大学电气工程学院,江苏南京210096

出　　处：《现代电子技术》2018年第7期93-96,共4页Modern Electronics Technique

基　　金：国家电网公司项目:适应复杂环境的水冷电动汽车直流充电机关键技术研究;国家自然科学基金重大国际合作项目(51320105002)资助~~

摘　　要：开关器件对地寄生电容是共模电流流通的主要路径,产生的传导EMI会对设备形成不利影响。以充电机水冷散热器为例进行分析,利用金属静电屏蔽特性采取两种措施降低电磁干扰。一种是在开关器件与散热器之间的导热硅脂间插入一接直流0 V地的金属层;另一种是对水冷散热器结构进行改造,将金属水箱分为两部分,利用绝缘密封安装槽连接这两部分,其中一块金属水盖接到直流0 V地上,另一块水盖通过机壳接地。仿真结果表明采用所述方法均能有效地抑制传导共模电流,而后一种方法能达到更好的效果。The parasitic capacitance to ground of switching devices is considered as the main path for common-mode(CM)current flow,and the conducted EMI generated in it has poor effect on the device.The water cooling heatsink of the charger is taken as an example for analysis.According the metal electrostatic shielding properties,two EMI suppression measures are adopted to reduce EMI.For the first measures,a metal layer linking to DC0V ground is inserted into the thermal grease between switching device and heatsink.For the second measures,the structure of the water cooling heatsink is altered to divide the metal tank into two parts,and an insulating seal mounting groove is used to connect the two parts.One metal cover is con-nected to DC0V ground,and another cover is connected to ground by chassis.The simulation results show that both of the two measures can suppress the conducted CM current effectively,but the second measure can reach the suppression effect better.

关 键 词：水冷散热器 导热硅脂 对地寄生电容 传导EMI 静电屏蔽 电磁干扰 

分 类 号：TN99-34[电子电信—信号与信息处理]