现代电子技术2018，Vol.41Issue(7)：93-96,4.DOI:10.16652/j.issn.1004-373x.2018.07.023
不同屏蔽措施对电磁干扰抑制的研究
Research on EMI suppression with different shielding measures
摘要
Abstract
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 DC 0 V 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 DC 0 V 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Key words
water cooling heatsink/thermal grease/parasitic capacitance to ground/conducted EMI/electrostatic shielding/electromagnetic interference分类
信息技术与安全科学引用本文复制引用
张浩,陈良亮,齐连伟,王念春,陈中,黄学良..不同屏蔽措施对电磁干扰抑制的研究[J].现代电子技术,2018,41(7):93-96,4.基金项目
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 Project Supported by National Power Grid Corp.Program:Research on Key Technologies of DC Charger for Complex Environment,Major International Cooperation Projects of National Natural Science Foundation of China(51320105002) （51320105002）
