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http://dx.doi.org/10.5515/KJKIEES.2017.28.5.382

Human Effect for Commercial Wireless Power Transfer System Operating at Low Frequency  

Kang, Jun-Seok (Department of Information & Communication Engineering, Chungbuk National University)
Lee, Seungwoo (Department of Information & Communication Engineering, Chungbuk National University)
Hong, Ic-Pyo (Department of Information & Communication Engineering, Kongju National University)
Cho, In-Kui (Radio Technology Research Department, ETRI)
Kim, Nam (Department of Information & Communication Engineering, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.28, no.5, 2017 , pp. 382-390 More about this Journal
Abstract
In this paper, we consider particular exposure scenarios to evaluate human effects for inductive commercial wireless charging device operating at low frequency. The coil used in this study is the A10 model in Qi standard proposed by WPC(Wireless Power Consortium), and input power is 5 W to the operating frequency of 155 kHz. In perfectly aligned condition, the max leakage magnetic field is $257.58{\mu}T$ which is obtained at the side of the device, and it is exceeded about 7.4 times of the ICNIRP 1998 reference level. The SAR is evaluated with homogeneous phantom which has electric constants of wet skin. The max value of the SAR is $134.47{\mu}W/kg$ which is obtained at the side of the device also, and it is much lower than the international guidelines. Especially, it showed higher SAR values in case of misalignment condition, so we will need to consider the misalignment condition importantly when we evaluate human effects for wireless power transfer system.
Keywords
Wireless Power Transfer; Commercial Wireless Changing Device; Human Effect; Low Frequency;
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