Shielding Impact on Conducted Emission of a kW-level WPT System: an Experimental Approach

Wireless power transfer (WPT) systems are widely used in automotive and consumer electronics due to the many benefits they can offer. However, according to the inherent presence of power electronics and extended electromagnetic parts, they can be the source of significant electromagnetic interference (EMI), with emissions scaling with power and frequency. This paper investigates the conducted emissions (CEs) of a 1 kW WPT system, assessing the effect of the conductive shields of the coil assemblies on the CEs through a purely experimental approach. This study aims to provide a quantitative insight into the role of the shielding in WPT CEs, considering both the conditions of grounded and ungrounded shields. The CEs are measured with an EMI receiver and the impedance seen from the system under test to the power supply is stabilised with a line impedance stabilisation network (LISN).