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학술지 Improved Calculation Method of Coupling Factors for Low-Frequency Wireless Power Transfer Systems
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안장용, 홍선의, 김혜림, 송경환, 최형도, 안승영
International Journal of Environmental Research and Public Health, v.19 no.1, pp.1-12
21HH2400, 복합 전파환경에서의 국민건강 보호 기반 구축 사업, 최형도
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 car-ried 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 re-strictions. 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.
KSP 제안 키워드
And compliance, Conventional methods, Coupling Factor, Discretization errors, Electromagnetic Field, International Electrotechnical Commission(IEC), Numerical calculation, Wireless Power Transfer Systems(WPTS's), calculation method, current density, human body model(HBM)
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