Diagnosis Method of Radiated Emission from Battery Management System for Electric Vehicle

AbstractElectromagnetic emission from EVs has an effect on board equipment and nearby vehicles in urban transportation. Moreover, the electromagnetic emission from BMS in EVs can exceed the CISPR 12 limits of radiated emission for EVs. The radiated electric fields average for an electric car (CISPR12) is measured in semi-anechoic chamber (SAC) at a distance of 10m to study the diagnosis method for EMI. An exclusion procedure for EMI from BMS is designed to determine the component responsible for emission peaks through far-field antenna testing for vehicle. BMS and instrument are responsible for the average radiated emission exceeded the limits for the testing EV. The near-field testing is used to diagnose the location of EMI. From measurements and analysis of EMI from clock, the clock oscillator is the key component responsible for narrowband emission, and power devices’ switching in DC-DC converter BMS is the key component responsible for broadband emission