Multilevel simulation of the influence of magnetic shield geometric alternatives on the quality factor of the wireless power transfer coils

2019 ◽  
Vol 102 (1) ◽  
pp. 85-96
Author(s):  
Michal Frivaldsky ◽  
Miroslav Pavelek ◽  
Pavol Spanik
Keyword(s):  
Quality Factor ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Magnetic Shield

scholarly journals Characteristic Analysis of Electromagnetic Force in a High-Power Wireless Power Transfer System

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3088 ◽  
Author(s):  
Xian Zhang ◽  
Xuejing Ni ◽  
Bin Wei ◽  
Songcen Wang ◽  
Qingxin Yang
Keyword(s):  
High Power ◽  
Electromagnetic Force ◽  
Wireless Power Transfer ◽  
Element Model ◽  
Coupling Mechanism ◽  
Power Transfer ◽  
Wireless Power ◽  
Characteristic Analysis ◽  
Magnetic Shield ◽  
Wireless Power Transfer System

In order to explore the influence of the electromagnetic force (EMF) on the coupling mechanism in a high-power wireless power transfer (WPT) system, the characteristics of the EMF are investigated by theoretical calculation and simulation. The expressions of the EMF on the WPT structure with magnetic shielding are derived in time domain and frequency domain, respectively. The EMF is divided into Lorentz force and Kelvin force. The distribution and changing regularity of the EMF on the coil and the magnetic shield under different exciting currents are solved by the finite element model, and the harmonic of the EMF is analyzed in detail. The results show that the coil is subjected to the EMF in both radial and axial directions. The EMF on the magnetic shield is opposite to the EMF on the coil, and the force between the transmitting coil and the receiving coil is repulsive. The frequency of the EMF is twice that of the system resonant frequency. An experimental prototype is built to prove the correctness of the predicted characteristics. It is shown that the EMF should be carefully considered in the application of high-power WPT systems.

scholarly journals Implantable Magnetic Resonance Wireless Power Transfer System Based on 3D Flexible Coils

2020 ◽  
Vol 12 (10) ◽  
pp. 4149
Author(s):  
Dongdong Xu ◽  
Qian Zhang ◽  
Xiuhan Li
Keyword(s):  
Magnetic Resonance ◽  
Quality Factor ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Resonant Circuit ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Inductance ◽  
Wireless Power Transfer System

A magnetic resonance wireless power transfer system based on flexible 3D dual-coil is proposed and implemented in this paper. Firstly, a magnetic coupling resonant circuit model based on dual-coil is established, and the analysis indicates that enlarging the coil inductance and quality factor can effectively improve the transfer efficiency and performance. The coil parametric model is created by HFSS (High Frequency Structure Simulator), the effects of structural parameters on the coil inductance and quality factor are analyzed, and the optimized coil structure parameters are determined. To achieve maximum power transfer, the coupled resonant model after impedance matching is established and simulated in HFSS, and S11 reaches −30 dB at 13.56 MHz. Considering the radiation on human tissues, the SAR (Special Absorption Rate) value is evaluated simultaneously. To confirm the validity of the proposed prototype, the efficient wireless power transfer system composed of two flexible and biocompatible coils with 10 mm radius has been verified by the experimental measurements, and measure results show that the output power is 70 mW, when the transfer distance is 6 mm, the input power is 200 mW, and the maximum transfer efficiency is 35%.

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