Modeling Method of Internal Impedance of Common Mode Noise Source in Switching Power Supply

doi:10.16628/j.cnki.2095-8188.2021.01.014

Abstract

Abstract:

Taking the small communication power supply as the research object,the transmission mechanism of common mode noise is analyzed,and the key factors affecting the internal impedance of common mode noise source are clarified.Through theoretical analysis,a common mode noise source internal impedance modeling method based on insertion loss method is proposed.Based on this method,the common mode noise source internal impedance parameters of switching power supply can be accurately extracted,and the high-frequency equivalent circuit model of common mode noise source can be established.Finally,the accuracy of the proposed method is verified by experiments.

Key words: common mode noise, internal impedance, filter, insertion loss

CLC Number:

TM572

LIN Subin, LU Wentao, ZHANG Liping, WU Qinwei. Modeling Method of Internal Impedance of Common Mode Noise Source in Switching Power Supply[J]. LOW VOLTAGE APPARATUS, 2021, 0(1): 84-89.

Figures/Tables 11

References 12

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参数	C/nF	L/nH	R/Ω
Z₁	34	18.7	0.20
Z₂	91	27.0	0.22
Z₃	184	24.7	0.24

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