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Electromagnetic coupling prediction for the low voltage wire harness of electric vehicle

Multi-port network theory can simplify complex systems by the equivalence of ports. Therefore, the wiring harness model is equivalent to the port network in the electromagnetic coupling prediction for the low-voltage wiring harnesses of electric vehicle. The scattering parameters between the ports of the wire harness are obtained by simulation in Feko, then the characteristics of the wire harness coupling network can be established. According to the relationship between the voltage and current of ports, the voltage and current prediction formula of the interfered harness port is derived. Comparing the port current of the interfered harness collected from the vehicle with the current obtained from the simulation, and qualitatively analyzing whether there is a risk of electromagnetic interference, it verified the effectiveness of the multiport network method to predict the electromagnetic coupling between the wiring harnesses. To a certain extent, the EMC performance of the vehicle can be guaranteed if the method is applied to the vehicle development stage.