Radiated Disturbance Measurements in SAC and on OATS for Wireless Power Transfer System

Measurement methods and suppression techniques for radiated disturbances from high-power wireless power transfer (WPT) systems are being developed. Magnetic field strength measurements of the radiated disturbance in the frequency range 9 kHz to 30 MHz at a measurement distance of 10 m were performed in a semi-anechoic chamber (SAC), the walls of which were treated as sound-reflecting structures. Measurements were also performed on an open-area test site (OATS), where ambient noise was considered. In this pater, the effective of the measurements in the SAC was verified at a nominal distance of 10 m in the frequency range 9 kHz to 30 MHz. Then, the suppression techniques for the radiated disturbances at the 85 kHz operating frequency band were evaluated in the WPT system with a transmitting power of 5 kW.