Prediction method for low-frequency radiation emission caused by common-mode noise of high-voltage wire harness of electric car

Abstract

The invention relates to a prediction method for the low-frequency radiation emission caused by a common-mode noise of a high-voltage wire harness of an electric car, and belongs to the field of automobile EMC. According to the method, a lumped parameter equivalent circuit of interference equipment and a measurement antenna serves as a network peripheral item, and the method achieves the prediction of a radiation electric field and a magnetic field through the network peripheral item, characteristics of a network port and antenna calibration parameters, thereby reducing the modeling difficulty, achieving the circuit parameter decoupling, and overcoming a conflict between the precision calculation and calculation efficiency during the prediction of the common-mode radiation emission causedby a high-voltage system cable harness when the whole car is in a complex coupling environment.

Description

technical field [0001] The invention belongs to the field of automobile EMC, and relates to a low-frequency radiation emission prediction method caused by common-mode noise of a high-voltage wire harness of an electric automobile. Background technique [0002] Vehicle low-frequency radiated emissions are one of the regulatory requirements for electric vehicles. Due to its high voltage and high current characteristics, the high-voltage system of an electric vehicle is the main source of noise emitted by the vehicle's low-frequency radiation. In the process of automobile development, the earlier the EMC design can be carried out, the EMC problems can be found, and the more measures can be taken to solve the problems, the lower the cost. A large number of theories and engineering practices show that 90% of electromagnetic interference is caused by electromagnetic radiation of cables. The high-voltage system of electric vehicles involves many components, the topological relati...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a method for predicting low-frequency radiation emissions caused by common-mode noise in high-voltage wiring harnesses of electric vehicles, which solves the problem of prediction accuracy while realizing the prediction of low-frequency radiation emissions of high-voltage systems in multi-wire harnesses and complex coupling environments. Contradiction with Computational Efficiency

Images