Exposure Assessment of a 20-kW Wireless Power Transfer System for Electric Vehicles
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ght © 2020 KSAE/ 11802 pISSN 12299138/ eISSN 19763832
EXPOSURE ASSESSMENT OF A 20-kW WIRELESS POWER TRANSFER SYSTEM FOR ELECTRIC VEHICLES Beomjin Choi1)*, Eunha Kim1), Waegyeong Shin2), Sangwook Park3) and Kichai Kim4) EMI/EMC R&D Center, Korea Automotive Technology Institute, 303 Pungse-ro, Cheonan-si, Chungnam 31214, Korea 2) Electric Powertrain System R&D Center, Korea Automotive Technology Institute, 303 Pungse-ro, Cheonan-si, Chungnam 31214, Korea 3) Electronic & Electrical Engineering, Daegu University, Gyeongbuk 38453, Korea 4) Electrical Engineering, Yeungnam University, Gyeongbuk 38541, Korea 1)
(Received 17 June 2019; Revised 7 October 2019; Accepted 5 January 2020) ABSTRACTWireless power transfer technology is essential for autonomous electric vehicles. Electric vehicles demand increasingly higher power outputs. Therefore, it is necessary to study the harmfulness of human body exposure to electromagnetic waves generated in a wireless power transfer system. This study provides exposure assessment for a 20-kW wireless power transfer for electric vehicles. The electromagnetic field distribution of a 20-kW wireless power transfer system is analyzed for the two cases where the transmitting and receiving pads are aligned with the small gap and not aligned with the large gap, and compared with the results of the experimental measurements. Moreover, when the system (not aligned with the large gap) is installed in an electric vehicle, analysis of the exposure is carried out. Finally, dosimetry is performed on the exposure scenario in which the human body is placed around the vehicle, and the induced values inside the human body are compared with the internation guidelines. As a result, the induced values exceed the basic restrictions for the fat and the muscle of the human body, but not for the central nervous system. KEY WORDS : Dosimetry, Electric Vehicle, Numerical Human Body Model, Wireless Power Transfer, Safety Guideline
1. INTRODUCTION
electric vehicles have been published (Park, 2015; Laakso and Hirata, 2013; Shimamoto et al., 2015). The results of those papers are based on simulations (without an actual system) or on the low power system (less than 3.3 kW). (Mohamed et al., 2018) considers 25 kW wireless power system mounted on the electric vehicle, but is confined to the experimental evaluation and the measurement methodology without the analysis for induced quantities into the human body. Also, (Chakarothai et al., 2017) does not consider the actual vehicle equipped with the wireless power transfer system, but simply use a metal plate to verify the vehicle body’s shielding effect. In this paper, we perform exposure evaluation of a 20kW electric vehicle wireless charging system. We calculate the electromagnetic field around the wireless charging system through electromagnetic simulation based on the developed wireless charging system. In addition, electromagnetic simulations and experimental evaluations are performed with the vehicle equipped with the wireless charging system, and the induced quan
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