灌胶对EMI滤波器磁元件近场耦合影响研究

doi:10.16628/j.cnki.2095-8188.2025.06.002

摘要/Abstract

摘要：

针对电磁干扰(EMI)滤波器灌胶后滤波效果变差的问题,首先建立综合考虑电场耦合和磁场耦合的滤波器近场耦合等效模型,并对磁元件灌胶前后近场耦合等效参数进行提取,结果表明灌胶会影响滤波器的自寄生效应和磁元件间的近场耦合效应。其次,对灌胶前后滤波器磁元件的近场耦合等效参数进行敏感性分析,结果表明灌胶前后滤波器插入电压增益变化主要由受近场耦合影响大的磁元件近场耦合等效电容参数变化引起,进一步明确了灌胶对磁元件近场耦合的影响机理。最后,提出部分灌胶方法改进传导EMI噪声,实验验证了部分灌胶的有效性。

关键词: EMI滤波器, 灌胶, 磁元件, 近场耦合, 电磁干扰

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.

Key words: EMI filter, potting, magnetic element, near-field coupling, electromagnetic interference

中图分类号:

TM133

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, 0(6): 7-16.

HUANG Ju, LI Huanhuan, MAO Xingkui, DONG Jiqing. Study on Influence of Potting on Near-Field Coupling of Magnetic Elements in EMI Filters[J]. LOW VOLTAGE APPARATUS, 2025, 0(6): 7-16.

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参数	数值
硬度/HA	45±5
相对介电常数	2.8~4.0
体积电阻率/(Ω·cm)	≥1.0×10¹²
介电强度/(kV·mm^-1)	≥14
导热系数/[W·(m·K)^-1]	0.6~0.8

参数	Z_y1	参数	Z_y1
R/MΩ	R₁₃=1.89	C/pF	C₁₃=1.30
L/mH	L_a=35.00

参数		自参数	近场耦合等效参数
L_F3	R/kΩ	R₁₂=7.38	R_eq1=6.95
	L/μH	L₁=470.15	L_b=476.12
	C/pF	C₁₂=43.42	C_eq1=43.95
L_{F2_dm}	R/kΩ	R₃₄=96.56	R_eq2=95.96
	L/μH	L₂=181.30	L_c=182.21
	C/pF	C₃₄=2.06	C_eq2=2.55

参数		Z_y1	Z_y2	Z_y3
灌胶前	R/kΩ	R₁₃=1 890.00	R_eq1=6.95	R_eq2=95.96
	L/μH	L_a=35 000.00	L_b=476.12	L_c=182.21
	C/pF	C₁₃=1.30	C_eq1=43.95	C_eq2=2.55
灌胶后	R/kΩ	R₁₃=1 900.00	R_eq1=6.89	R_eq2=96.21
	L/μH	L_a=35 000.00	L_b=474.69	L_c=181.98
	C/pF	C₁₃=1.67	C_eq1=49.21	C_eq2=4.46

参数	Z_y1	参数	Z_y1
R/kΩ	R₁₃=134.60	C/pF	C₁₃=0.80
L/mH	L_a=49.00