Magnetic dosimetry simulations of wireless power transfer systems with high resolution voxel models utilizing the co-simulation scalar potential finite difference scheme

Wireless power transfer (WPT) systems can be utilized to charge batteries of electrically powered vehicles with a power transfer in the order of tens of kilowatts. The low frequency source currents in the WPT system emanate magneto-quasistatic fields that induce electric fields inside the body tissues of exposed persons. This article compares the International Commission on Non-Ionizing Radiation Protection (ICNIRP) recommended 99th percentile of the voxel averaged electric field strengths inside the body model determined by commercial simulation tools and the co-simulation scalar potential finite difference scheme. Furthermore, the body model resolution is enhanced to 1 x 1 x 1 mm(3) which results in about eight times larger numbers of degrees of freedom than obtained by using the ICNIRP recommended resolution. The fine resolution body model electric field values (and also the resulting simulation times) are compared against field values of the coarser model recommended by ICNIRP. To cover a broad range of exposure scenarios, the comparisons are presented for different configurations of a WPT system of an electric vehicle and also for varying postures of the human body as passenger and bystanding person.