Abstract
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.
Highlights
Wireless charging technologies, as an attractive alternative to cabled charging, are attracting widespread interest in the field of consumer electronics, medical implants and electric vehicles [1,2,3,4], due to their convenient and safe characteristics [5,6,7]
2, so as to validate the attenuation effect of the conducted in the wireless charging system (WCS) which is shown in Figure 2, so as to validate the attenuation effect of the conducted emission emission from from direct current fed (DC-fed)
A mitigation conducted emission strategy based on transfer function from a DC-fed WCS for
Summary
As an attractive alternative to cabled charging, are attracting widespread interest in the field of consumer electronics, medical implants and electric vehicles [1,2,3,4], due to their convenient and safe characteristics [5,6,7]. DC-fed WCS is used in fast charging with high current and voltage and widely applied in electric vehicles (EVs) in future. As for wireless charging for EVs, many researchers pay attention to improving the charging efficiency and electromagnetic compatibility (EMC). Control strategy to improve the efficiency of wireless charging [8,9,10,11,12,13]. As for EMC, the two key considerations consist of electromagnetic emission and electromagnetic susceptibility (EMS)
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