Application Examples

EMCoS > Application Examples > EMC/EMI of PCB in Automotive Systems

    • EMC/EMI of PCB in Automotive Systems

    Introduction

    This application note considers coupling from radiating PCB to cable in car model. Near Field Sorce approach based on equivalence principle is used.

    Simulation Workflow

    PCB in Automotive Systems Simulation Workflow

    Near Field Source

    • The simulation model of complete PCB can be substituted by equivalent Near Field Source
    • Required information for Near Field Source is electromagnetic fields produced by ECU on surrounding closed surface
    • Electric and magnetic fields for Near Field Source can be calculated without presence of most part of passive objects

    Near Field Calculation around PCB

    Electric Field Components (500 MHz) around PCB

    Magnetic Field Components (500 MHz) around PCB

    Simulation Model Description

    Simulation Model PCB in Automotive Systems

    Simulation Model PCB in Automotive Systems

    Results

    Voltage coupled into the cable from PCB modeled as near field radiation source in the front part of the vehicle is shown below.

    PCB in Car Voltage Coupled at Near End Termination

    PCB in Car Voltage Coupled at Far End Termination

    The field radiated by PCB inside vehicle is shown below.

    Field Radiated by PCB inside Vehicle (500 MHz)

    Field Radiated by PCB inside Vehicle (602 MHz)

    Conclusions

    According to performed investigation the main conclusions are:

    • Component level simulation of PCB is done using EMCoS PCB VLab for major preprocessing and EMC Studio for calculation of EMI/EMC of PCB ports and elements
    • PCB can be analyzed on system level, as in described example of EMI/EMC in automotive systems using Near Field Source feature