LAPSE:2020.0251
Published Article
LAPSE:2020.0251
Mitigation Conducted Emission Strategy Based on Transfer Function from a DC-Fed Wireless Charging System for Electric Vehicles
Li Zhai, Yu Cao, Liwen Lin, Tao Zhang, Steven Kavuma
February 24, 2020
The large dv/dt and di/dt outputs of power devices in wireless charging system (WCS) in electric vehicles (EVs) always introduce conducted electromagnetic interference (EMI) emissions. This paper proposes a mitigation conducted emission strategy based on transfer function from a direct current fed (DC-fed) WCS for EVs. A complete test for the DC-fed WCS is set up to measure the conducted emission of DC power cables in a frequency range of 150 kHz⁻108 MHz. An equivalent circuit with high-frequency parasitic parameters for WCS for EV is built based on measurement results to obtain the characteristics of conducted emission from WCS. The transfer functions of differential mode (DM) interference and common mode (CM) interference were established. A judgment method of using transfer functions to determine the dominated interference mode responsible for EMI is proposed. From the comparison of simulation results between CM or DM and CM+DM interference, it can be seen that the CM interference is the dominated interference mode which causes the conducted EMI in WCS in EVs. A strategy of giving priority to the dominated interference mode is proposed for designing the CM interference filter. Finally, the conducted voltage experiment is performed to verify the mitigation conducted emission strategy. The conducted voltage of simulation and experiment is decreased respectively by 21.17 and 21.4 dBμV at resonance frequency 30 MHz. The conduced voltage at frequency range of 150 kHz⁻108 MHz can be mitigated to below the limit level-3 of CISPR25 standard (GB/T 18655-2010) by adding the CM interference filters.
Keywords
conducted emission, electric vehicle, mitigation strategy, wireless charging system
Suggested Citation
Zhai L, Cao Y, Lin L, Zhang T, Kavuma S. Mitigation Conducted Emission Strategy Based on Transfer Function from a DC-Fed Wireless Charging System for Electric Vehicles. (2020). LAPSE:2020.0251
Author Affiliations
Zhai L: National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China; Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China [ORCID]
Cao Y: National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China; Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China [ORCID]
Lin L: National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China; Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China
Zhang T: National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China; Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China
Kavuma S: National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China; Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China
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Journal Name
Energies
Volume
11
Issue
3
Article Number
E477
Year
2018
Publication Date
2018-02-25
Published Version
ISSN
1996-1073
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PII: en11030477, Publication Type: Journal Article
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LAPSE:2020.0251
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doi:10.3390/en11030477
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Feb 24, 2020
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Calvin Tsay
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