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Analysis of Safety Distance and Maximum Permissible Power of Resonant Wireless Power Transfer Systems with Regard to Magnetic Field Exposure

Journal of Magnetics, Volume 20, Number 4, 31 Dec 2015, Pages 450-459

Young-Min Park (Department of Electrical Engineering, Soongsil University), Jin-Kyu Byun *

(Department of Electrical Engineering, Soongsil University)

Abstract

In this paper, the safety distances and maximum permissible power (MPP) of resonant wireless power transfer systems are defined and derived with regard to human exposure to electromagnetic field (EMF). The definition is based on the calculated induced current density and electric field in the standard human model located between the transmitting and receiving coil. In order to avoid the adverse health effects such as stimulation of nerve tissues, the induced current and electric field must not exceed the basic restriction values specified in EMF safety guidelines. The different combinations of diameters of the coils and the distance between the two coils are investigated and their effects are analyzed. Two versions of EMF safety guidelines (ICNIRP 1998 and ICNIRP 2010) are used as bases for safety distance calculation and the difference between the two guidelines are discussed.

Keywords: human model; induced current; maximum permissible power; safety distance; wireless power transfer

DOI: http://dx.doi.org/10.4283/JMAG.2015.20.4.450

Full Text: PDF

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