Numerical Exposure Assessment Method for Low Frequency Range and Application to Wireless Power Transfer

Authors: Park S, Kim M

Year: 2016 Nov 29

Category: Electromagnetic Field Assessment

Journal: PLoS One

DOI: 10.1371/journal.pone.0166720

URL: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0166720

Abstract

Overview

This paper introduces a numerical exposure assessment method utilizing the finite-difference time-domain (FDTD) algorithm for quasi-static analysis. Its primary function is to facilitate the investigation of low frequency electromagnetic problems.

Methodology

Combination of scattered field FDTD method and quasi-static approximation.
Effectively computes induced electric fields within a human voxel model exposed to varying low-frequency sources.

Findings

The assessment method was rigorously tested and an excellent agreement with theoretical models was observed when applied to a dielectric sphere model exposed to a magnetic dipole source.

The practicability was underscored by analyzing the electric fields, current densities, and specific absorption rates induced in a human head and body positioned close to a 150-kHz wireless power system designed for cell phone charging.

Conclusion

Results were evaluated against the limits set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and IEEE. The findings assert the critical need for adherence to recommended safety limits to mitigate potential health risks related to electromagnetic field exposure, especially in everyday environments like wireless charging.

electromagnetic fields wireless power transfer FDTD non-uniform field source health risks safety standards

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