Evaluation Method of Electromagnetic Field Exposure Levels from Wireless Power Transfer System

If the wireless power transfer system is located to a person; the magnetic fields produce by the wireless power transfer system will vary in the region occupied by the human body. According the Institute of Electrical and Electronic Engineers (IEEE) and International Commission on Non-Ionizing Radiation Protection (ICNIRP), the predicated or the measured values have to be spatially averaged in an area representing the dimension of the human body and compared with the adopted reference level of exposure. Although spatial averaging is better approximation compared to point measurement, the standard of how to perform such an assessment does not exist. This paper describes the method for spatial averaging magnetic field. We analyzed the difference of spatial averaging value (1-and 2-dimensional templates consists of different number of position) and compared it with the standard uncertainty for measurement drift. The proposed methods are given to present the effectiveness of the choice of measurement position.