In response to the prevalent challenges of the wide frequency ranges and complexity of electromagnetic interference(EMI)sources during the design process of electric vehicle onboard chargers,a method based on port impedance testing for equivalent circuit modeling and system-level collaborative simulation is introduced.Initially,impedance testing and three-dimensional electromagnetic simulations are performed on various components of the on-board charger system to develop models for passive devices,port filters,and high-voltage shielded cables,extracting high-frequency parasitic parameters from key printed circuit board.Subsequently,simulation program with integrated circuit equivalent models for active devices are established and validated for accuracy through double pulse experiments.To address the challenge of synchronizing simulation and modeling in the power factor correction circuit's control loop,a co-modeling approach is employed to build the equivalent circuit model of the entire system.Finally,the individual component models are integrated to develop a comprehensive conducted EMI prediction model for the on-board charger system.Simulations and experiments are performed in accordance with relevant testing standards.The results reveal that within the 150 kHz to 30 MHz frequency range,the prediction accuracy deviates by less than 9 dB from the actual results,indicating strong consistency.This suggests that the model can accurately predict the conducted interference levels at the high-voltage AC side of the on-board charger system,thereby offering valuable insights for electromagnetic compatibility design.
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