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EMI Noise Source Impedance Extraction Method Based on SP-DE Algorithm(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年04期
Page:
13-18
Research Field:
电气工程
Publishing date:

Info

Title:
EMI Noise Source Impedance Extraction Method Based on SP-DE Algorithm
Author(s):
Ma Hao; Pei Yakang; Zhao Yang; Zhang Cheng; Sun Yiqun; Zhou Mengxia
School of NARI Electrical and Automation,Nanjing Normal University,Nanjing 210023,China
Keywords:
noise source impedance; scattering parameter; DE algorithm; EMI filter
PACS:
TM934.7
DOI:
10.3969/j.issn.1672-1292.2021.04.003
Abstract:
EMI filter is an effective means to suppress conducted EMI noise,and accurate noise source impedance extraction is the key to filter design. Traditional impedance extraction methods,such as the scattering parameter(SP)method,dual current probe method,etc.,can only extract the amplitude and phase information of the noise source impedance,and cannot accurately describe the impedance characteristics of the noise source. In view of this,this paper proposes a noise source impedance extraction method combining the SP method and the differential evolution(DE)algorithm. This method can accurately extract the equivalent circuit parameters of the noise source impedance and provide an important reference for its filter design. This method first obtains the noise source impedance information according to the SP method,and then uses the DE algorithm to process the impedance information to determine its equivalent circuit parameters. Finally,the EMI filter is designed according to the extracted internal impedance equivalent circuit parameters. Taking a switching power supply as an example,the filter design and conducted EMI noise suppression experiments are carried out on the basis of the method proposed in this article. The experimental results show that the filter designed on the basis of the SP-DE method has a better suppression effect of conducted EMI noise.

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Last Update: 2021-12-15