The noise source impedance of inverter has a great influence on the filtering effect of electromagnetic interference (EMI) filter, and it is necessary to extract and analyze the noise source impedance of inverter when designing the filter. A passive EMI filter design method based on terminal model of inverter was studied. A terminal EMI model of inverter was established. By measuring terminal voltage as well as terminal current of inverter and using optimized algorithm, the equivalent noise source and the equivalent source impedance of inverter were extracted. Considering the noise source impedance, the load impedance and the high-frequency characteristics of filter components, optimization algorithm was used to calculate the component parameters of filter, so as to realize the quantitative design of EMI filter. For the problem that common-mode EMI at some frequency points exceeded limit after connecting the filter, the cause of resonance was analyzed, and a damping circuit design method was proposed. Connecting the designed EMI filter for experiment, EMI of the inverter output lines met the standard, which validated the proposed EMI filter design method.
Tian-xiang ZHOU,Xiao-yan ZHENG,Shi-ze YE,Heng-lin CHEN. Electromagnetic interference filter design based on terminal model of inverter. Journal of ZheJiang University (Engineering Science), 2021, 55(11): 2215-2224.
Tab.1Component parameters and connection mode of insertion impedances
Fig.3Amplitude-frequency curve of equivalent noise sources
Fig.4Amplitude-frequency curve of equivalent noise source impedances
Fig.5Comparison of measured and calculated terminal voltage ULG
Fig.6Comparison of measured and calculated terminal voltage UNG
Fig.7Terminal DM EMI / CM EMI model of inverter
Fig.8Comparison of terminal DM voltage and CM voltage with conducted EMI limit
Fig.9Required DM insertion loss and CM insertion loss of inverter
Fig.10Terminal DM EMI model after connecting π-shaped DM filter
方案
CX1/μF
CX2/μF
LDM/μH
1
4.47
2.83
5.46
2
3.91
4.53
3.55
3
2.94
2.15
7.73
Tab.2Component parameters of π-shaped DM filter obtained by simulation
Fig.11DM EMI after connecting π-shaped DM filter
Fig.12Terminal CM EMI model after connecting π-shaped CM filter
Fig.13Terminal CM EMI model after connecting two-stage π-shaped CM filter
方案
CY1/nF
CY2/nF
CY3/nF
LCM1/mH
LCM2/mH
1
1.20
0.23
0.46
5.00
0.42
2
1.86
0.13
0.24
1.60
0.46
3
1.35
0.10
0.10
0.38
5.00
Tab.3Component parameters of two-stage π-shaped CM filter obtained by simulation
方案
CY1/nF
CY2/nF
CY3/nF
LCM1/mH
LCM2/mH
1
1.0
0.5
0.5
5.0
0.4
2
2.2
0.5
0.5
1.5
0.4
3
1.0
0.5
0.5
0.5
5.0
Tab.4Component parameters of two-stage π-shaped CM filter actually selected
Fig.14CM EMI after connecting two-stage π-shaped CM filter
Fig.15High-frequency equivalent model of two-stage π-shaped CM filter
Fig.16CM EMI after adding different damping resistors
Fig.17Connection diagram of EMI filter
Fig.18EMI of L-line and N-line after connecting filter
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