Assessing Human Exposure to Electromagnetic Fields From Wireless Power Transmission Systems

Christ, Andreas; Douglas, Mark; Nadakuduti, Jagadish; Kuster, Niels

doi:10.1109/jproc.2013.2245851

Cited by 154 publications

(84 citation statements)

References 51 publications

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“…Previously, it has been shown that the magnetic field is negligibly disturbed by the body [6], [7], [9], [15]. Therefore, the magnetic field can be first determined in free space, for instance, using method of moments, and then the same field can be used for magnetoquasistatic SAR calculations.…”

Section: Assessment Of Human Exposurementioning

confidence: 99%

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

Laakso

Shimamoto

Hirata

et al. 2015

IEICE Trans. Commun.

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SUMMARY Magnetic resonant coupling between two coils allows effective wireless transfer of power over distances in the range of tens of centimeters to a few meters. The strong resonant magnetic field also extends to the immediate surroundings of the power transfer system. When a user or bystander is exposed to this magnetic field, electric fields are induced in the body. For the purposes of human and product safety, it is necessary to evaluate whether these fields satisfy the human exposure limits specified in international guidelines and standards. This work investigates the effectiveness of the quasistatic approximation for computational modeling human exposure to the magnetic fields of wireless power transfer systems. It is shown that, when valid, this approximation can greatly reduce the computational requirements of the assessment of human exposure. Using the quasistatic modeling approach, we present an example of the assessment of human exposure to the non-uniform magnetic field of a realistic WPT system for wireless charging of an electric vehicle battery, and propose a coupling factor for practical determination of compliance with the international exposure standards. key words: wireless power transfer, human exposure, dosimetry

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Section: Assessment Of Human Exposurementioning

confidence: 99%

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

Laakso

Shimamoto

Hirata

et al. 2015

IEICE Trans. Commun.

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“…For example, in [4], the authors adopted a frequency range of 20-40 kHz when the planned distance from coil to coil is roughly 10 cm. Magnetic resonant coupling systems typically work in high-frequency (HF) bands; a frequency range of 1-50 MHz was considered in [50]. In the magnetic resonant coupling method, high efficiency with a larger distance between the receiving and transmitting antennas can be achieved when their resonance frequencies are the same [51].…”

Section: Frequencymentioning

confidence: 99%

Opportunities and Challenges for Near-Field Wireless Power Transfer: A Review

et al. 2017

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Abstract:Traditional power supply cords have become less important because they prevent large-scale utilization and mobility. In addition, the use of batteries as a substitute for power cords is not an optimal solution because batteries have a short lifetime, thereby increasing the cost, weight, and ecological footprint of the hardware implementation. Their recharging or replacement is impractical and incurs operational costs. Recent progress has allowed electromagnetic wave energy to be transferred from power sources (i.e., transmitters) to destinations (i.e., receivers) wirelessly, the so-called wireless power transfer (WPT) technique. New developments in WPT technique motivate new avenues of research in different applications. Recently, WPT has been used in mobile phones, electric vehicles, medical implants, wireless sensor network, unmanned aerial vehicles, and so on. This review highlights up-to-date studies that are specific to near-field WPT, which include the classification, comparison, and potential applications of these techniques in the real world. In addition, limitations and challenges of these techniques are highlighted at the end of the article.

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“…By σ is the electric conductivity of the tissue in S/m, ρ is the mass density in Kg/m 3 , and E is the root-mean-square (rms) magnitude of the electric field strength in (V/m) inside the material [6]. Then, we can calculate the SAR by using this equation.…”

Section: Specification Absorption Ratementioning

confidence: 99%

Electromagnetic Energy Absorption due to Wireless Energy Transfer: A Brief Review

2016

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Abstract. This paper reviews an implementation of evaluating compliance of wireless power transfer systems with respect to human electromagnetic exposure limits. Methods for both numerical analysis and measurements are discussed. The objective is to evaluate the rate of which energy is absorbed by the human body when exposed to a wireless energy transfer, although it can be referred to the absorption of other forms of energy by tissue. An exposure assessment of a representative wireless power transfer system, under a limited set of operating conditions, is provided in order to estimate the maximum SAR levels. The aim of this review is to conclude the possible side effect to the human body when utilizing wireless charging in daily life so that an early severe action can be taken when using wireless transfer.

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Assessing Human Exposure to Electromagnetic Fields From Wireless Power Transmission Systems

Cited by 154 publications

References 51 publications

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

Opportunities and Challenges for Near-Field Wireless Power Transfer: A Review

Electromagnetic Energy Absorption due to Wireless Energy Transfer: A Brief Review

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