Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications

2021 ◽  
Vol 32 ◽  
Author(s):  
Thanh Son Pham ◽  
Thao Duy Nguyen ◽  
Dinh Lam Vu
Keyword(s):  
Evanescent Wave ◽  
Wireless Power Transfer ◽  
Optimization Approach ◽  
Efficiency Improvement ◽  
Power Transfer ◽  
Wireless Power ◽  
Metamaterial Structure ◽  
Transmission Coefficients ◽  
Unit Cells ◽  
The Magnetic Field

In this article, we investigate a compact metamaterial structure for enhancing a magnetic resonant wireless power transfer (WPT) system operated at 6.5 MHz. A thin magnetic metamaterial (MM) slab placed between the transmitter (Tx) and receiver (Rx) coil can improve WPT efficiency. The metamaterial unit cell is designed by a ten-turn spiral resonator (10T-SR) loaded with an external capacitor. The resonant frequency of MM unit cells can be easily controlled by changing the capacitor value. By using the optimization approach, we achieve a significant WPT efficiency improvement at a mid-range distance. The results showed an enhancement of the magnetic field in the WPT system when MM slab was present. This demonstrates the ability to amplify the evanescent wave of MM slab, thereby improving the WPT efficiency. The transmission coefficients of WPT system at 60 cm increased from 0.5 to 0.76 with MM slab, which corresponds to a 46% improvement.

Omnidirectional non-radiative wireless power transfer with rotating magnetic field and efficiency improvement by metamaterial

2014 ◽  
Vol 116 (4) ◽  
pp. 1579-1586 ◽  
Author(s):  
Bang-Jun Che ◽  
Guo-Hui Yang ◽  
Fan-Yi Meng ◽  
Kuang Zhang ◽  
Jia-Hui Fu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Wireless Power Transfer ◽  
Rotating Magnetic Field ◽  
Efficiency Improvement ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Study of efficiency improvement for wireless power transfer based on negative permeability metamaterials

2018 ◽  
Vol 48 (11) ◽  
pp. 1234-1240
Author(s):  
WenHui XIN ◽  
Meng JIANG ◽  
Fei HE ◽  
DengXin HUA ◽  
KaiKai LIU
Keyword(s):  
Wireless Power Transfer ◽  
Negative Permeability ◽  
Efficiency Improvement ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Shielding the magnetic field of wireless power transfer system using zero-permeability metamaterial

2019 ◽  
Vol 2019 (16) ◽  
pp. 1812-1815 ◽  
Author(s):  
Conghui Lu ◽  
Xiutao Huang ◽  
Cancan Rong ◽  
Zhaoyang Hu ◽  
Junfeng Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Wireless Power Transfer System ◽  
The Magnetic Field

scholarly journals Evaluation of the Magnetic Field Leakage from Two Wireless Power Transfer Systems for EV/PHV Driven Simultaneously

2019 ◽  
Vol 10 (2) ◽  
pp. 41
Author(s):  
Toshiaki Watanabe ◽  
Yusuke Hakuta
Keyword(s):  
Magnetic Field ◽  
Human Exposure ◽  
Wireless Power Transfer ◽  
Hybrid Vehicles ◽  
Reference Level ◽  
Current Phase ◽  
Power Transfer ◽  
Wireless Power ◽  
Human Exposure Assessment ◽  
The Magnetic Field

Wireless power transfer for electric and plug-in hybrid vehicles has been developed to facilitate battery charging. In a wireless power transfer system, because the magnetic field leaks to the surroundings of the vehicle, it is important to evaluate the quantitative human exposure. The International Commission on Non-Ionizing Radiation Protection provides guidelines for human exposure assessment. In this study, we evaluate the magnetic field leakage under two parking configurations and current phase differences for two vehicles being simultaneously charged (3.7 kW at 85 kHz per vehicle). The results of the analysis show that the magnetic field leakage is lower than the reference level of the guidelines for all cases and that the leakage could be reduced by controlling the phase difference between the two wireless power transfer systems equally distributed from the single high-frequency power source for each parking configuration.

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