Design and Analysis of Power Supply Input EMC/EMI Filter for Automotive Electronic Control Units

Proper power supply filtering is a key requisite in meeting the EMC requirements set by international bodies. Traditional development processes rely upon measurements of developed samples to gain insight for future samples. There is a strong move towards virtual validation as a mean of reducing development time. This paper demonstrates a methodology for modelling of the input filter stage of electronic control units. The simulation results are compared to the conducted emission measurements based on CISPR 25 standard. The methodology is applied to a test board specifically designed to validate the methodology. The differences in results are discussed. Proposals for model improvements are given.