Influence of a traction battery´s input impedance on conducted emissions of an automotive HV inverter

Conducted emissions of automotive high voltage (HV) components recently are measured according to CIPSR 25. If the tested device conforms to specific limits on component level (set by customer and supplier agreements) it is inserted into the automotive system. Thus, the EMC performance of the investigated device has to be independent of the test level, e.g. on component or vehicle level. Comparing the standardized test setup with an automotive HV system, the main difference consists in the termination of the cable harness. In a component level EMC test setup the HV harness is terminated with line impedance stabilization networks (LISNs), whereas implemented in a vehicle the cables are connected to a traction battery. This contribution investigates the difference in the conducted emissions of an automotive power inverter, when it is introduced into an electromagnetic environment that is similar to vehicle level. Therefore, the input impedances of a HV battery are characterized and modeled. This battery emulation is introduced into the component level test setup and the deviations in the conducted emissions of a traction inverter are determined.