Development of an Artificial Galvanically Decoupled Impedance Network of Wireless Power Transfer Systems for EMI Measurements in the Frequency Range from 9 kHz to 30 MHz

Abstract:
Wireless charging by transferring energy over magnetically coupled coils offers a convenient, comfortable way of charging in a variety of environments. As corresponding vehicle components (e.g.: on-board chargers) need to comply with the according EMC standards, a proper termination load for devices under test is required for EMC testing. In this work, an artificial impedance network representing the electrical behavior from the vehicle to the power grid side of a magnetically coupled resonant wireless power transfer system is investigated. Based on an existing system, an impedance representation is exemplarily derived and constructed. The focus is on the common and differential mode impedances between 9 kHz - 30 MHz as well as an efficient power transfer up to 3.6 kW over a galvanically decoupled transformer. This setup can offer a compact artificial load for electromagnetic interference measurements in EMC laboratories. In conclusion, the designed impedance network’s performance will be evaluated and classified.