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Broadband wireless Forum (BWF) in Japan was established under the guidance of the Ministry of Internal Affairs and Communications, Japan, to enhance future wireless technologies with collaboration of industry, government and academia. Wireless power transmission technology is one of important technologies which will create new business area in the near future. From this background, Wireless Power...
In the paper, the characteristics of magnetic resonance wireless power transfer (MR-WPT) system with two off-axis rectangular self-resonators are analyzed. Efficiency and mutual inductance method between two rectangular coils are obtained. Mutual inductance in an off-axis system is derived at an arbitrary spatial point by subdividing the Rx coil and summing the magnetic flux density of each subdivision...
This paper proposes a wireless power transfer system that consists of a transmitter with a resonator and a receiver without a resonator. This system utilizes magnetic coupling and resonance. The receiver is simple, but this system has longer transfer distance than electromagnetic induction and requires no resonant frequency synchronization between the transmitter and the receiver that is required...
In this paper, a high-efficiency wireless energy transmission via magnetic resonance is experimentally implemented in a resonator with the various sizes of transmitting and receiving coils and the receiving coil having two shapes of rectangular and circular types. The transmission efficiency is analyzed by varying the transmission distance. The resonance between the transmitting and receiving coils...
We numerically studied the affect of power loss factors in a wireless power transfer system using resonant magnetic coupling. Resonant magnetic coupling is regarded as one of the most promising methods for mid-range wireless charging systems. To make this method practical, it is important to accurately estimate power transfer efficiency and effect of each loss factor in the device-designing stage...
A procedure to calculate parameters of an equivalent circuit of the magnetic-coupled resonant wireless power transfer is discussed. Equivalent circuit parameters are calculated from the mechanical and material parameters of the wireless power transfer structure. Both direct-fed type and indirect-fed type structure are considered. MoM calculation shows that the equivalent circuit has capability to...
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