电器与能效管理技术Issue(6)：7-16,10.DOI:10.16628/j.cnki.2095-8188.2025.06.002
灌胶对EMI滤波器磁元件近场耦合影响研究
Study on Influence of Potting on Near-Field Coupling of Magnetic Elements in EMI Filters
摘要
Abstract
To address the issue of degraded filtering performance in electromagnetic interference(EMI)filters after potting,a near-field coupling equivalent model of the filter considering both electric field coupling and magnetic field coupling is established.The near-field coupling equivalent parameters of magnetic elements are extracted before and after potting.The parameter extraction results show that potting can affect the self-parasitism effect of the filter and the near-field coupling effect between magnetic elements.Then,the sensitivity analysis of the near-field coupling equivalent parameters of the magnetic elements before and after potting is carried out.The results show that the change of the insertion voltage gain of the filter before and after potting is mainly caused by the change of equivalent capacity parameters of the magnetic elements which are greatly affected by the near-field coupling.The influence mechanism of the near-field coupling of the magnetic elements after potting is further clarified.Finally,a partial potting method is proposed to improve the conduction EMI noise,and the effectiveness of partial potting is verified by experiments.关键词
EMI滤波器/灌胶/磁元件/近场耦合/电磁干扰Key words
EMI filter/potting/magnetic element/near-field coupling/electromagnetic interference分类
信息技术与安全科学引用本文复制引用
黄菊,李欢欢,毛行奎,董纪清..灌胶对EMI滤波器磁元件近场耦合影响研究[J].电器与能效管理技术,2025,(6):7-16,10.基金项目
国家自然科学基金项目(51207025、52107183) （51207025、52107183）
