Measurement and Calculation Method of Wireless Power Transfer Coil Equivalent Series Resistance under the Vehicle

2020 ◽  
Author(s):  
Norihito Kimura ◽  
Hiroaki Yuasa
Keyword(s):  
Calculation Method ◽  
Series Resistance ◽  
Wireless Power Transfer ◽  
Equivalent Series Resistance ◽  
Power Transfer ◽  
Wireless Power ◽  
Measurement And Calculation Method

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

2021 ◽  
Vol 19 (1) ◽  
pp. 44
Author(s):  
Jangyong Ahn ◽  
Seon-Eui Hong ◽  
Haerim Kim ◽  
Kyunghwan Song ◽  
Hyung-Do Choi ◽  
...  
Keyword(s):  
Human Body ◽  
Calculation Method ◽  
Low Frequency ◽  
Wireless Power Transfer ◽  
International Electrotechnical Commission ◽  
Internal Electric Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Coupling Factors ◽  
Human Body Models

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.

Scaling Law of Coupling Coefficient and Coil Size in Wireless Power Transfer Design via Magnetic Coupling

2017 ◽  
Vol 137 (4) ◽  
pp. 326-333
Author(s):  
Chiaki Nagai ◽  
Kenji Inukai ◽  
Masato Kobayashi ◽  
Tatsuya Tanaka ◽  
Kensho Abumi ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Scaling Law ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Size
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