Improved Calculation Method of Coupling Factors for Low-Frequency Wireless Power Transfer Systems

Jangyong Ahn, Seon-Eui Hong, Haerim Kim, Kyunghwan Song, Hyung-Do Choi and Seungyoung Ahn
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Jangyong Ahn: The CCS Graduate School of Green Transportation, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34051, Korea
Seon-Eui Hong: Radio and Satellite Research Division, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea
Haerim Kim: The CCS Graduate School of Green Transportation, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34051, Korea
Kyunghwan Song: The CCS Graduate School of Green Transportation, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34051, Korea
Hyung-Do Choi: Radio and Satellite Research Division, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea
Seungyoung Ahn: The CCS Graduate School of Green Transportation, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34051, Korea

IJERPH, 2021, vol. 19, issue 1, 1-12

Abstract: The concept of a coupling factor was introduced in International Electrotechnical Commission (IEC) 62311 and 62233 to provide a product safety assessment that considers the localized exposure when an electromagnetic field (EMF) source is close to the human body. To calculate the coupling factors between the human body and EMF source, a numerical calculation should be carried out to calculate the internal quantities of the human body models. However, at frequencies below 10 MHz, the computed current density or internal electric field has computational artifacts from segmentation or discretization errors. Specifically, coupling factors are calculated based on the maximum values, which may include computational artifacts due to abnormal peaks. In this study, we propose an improved calculation method to remove computational artifacts by applying the 99.99th percentile in calculating the coupling factors without underestimation. The performance of the proposed method is verified through a comparison based on various human body models with wireless power transfer (WPT) systems and compliance with the reference levels and basic restrictions. The results indicate that the proposed method can provide uniform coupling factors by reducing the computational errors by up to 65.3% compared to a conventional method.

Keywords: electromagnetic field; exposure assessment; coupling factor; wireless power transfer (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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