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Metamaterials with negative relative permeability can change magnetic field in the opposite direction. It can also change the magnetic field direction to straight if it has zero relative permeability. Previously reported metamaterials use only single characteristic which is a negative or a zero permeability to enhance efficiency by field confinement in wireless power transfer (WPT) systems. In this...
Wireless power transfer through a metal object is a major obstacle for the conventionally available tightly coupled inductive system. In this paper, we demonstrate that a metal encased mobile device is enabled for efficient wireless charging using a loosely coupled resonant system. To facilitate this approach, three coils are designed and distributed on a metal phone case and they are tuned for resonance...
A wireless power transmitting system for a traveling mobility scooter based on magnetic resonance has been developed. In this paper, an overview of the system will be presented. Large square coils are set up on the road surface where a mobility scooter with a small coil and no battery is traveling. The power source is a Class E amplifier operating at 13.56MHz with an output power of 150W. Power is...
In this paper, the uncertainty of electric properties of wireless power transfer systems due to uncertain geometric design parameters is analyzed. An electromagnetic simulation tool, based on an integral formulation, is coupled with a stochastic method that quantitatively determines the contribution of each uncertain design variable to the output uncertainty in terms of Sobol' indices. A generalized...
We present the design and fabrication of a double-spiral coil used as the inductive element of a two-layer coupled resonator array for wireless power transfer applications. The waveguide presents an in-plane coupling coefficient of 0.92 and LC resonators with Q-factors of 97 at 13.56 MHz. Wireless monitoring of the power supply voltage enabled live modulation of the terminating impedance in the array...
This paper presents a novel approach for simultaneous inductive power transfer (IPT) and communication in one system. The communication part is using the coupled pair of coils of the IPT system as transmitting medium. The proposed architecture is applicable to new and existing IPT systems with operating frequencies above 100 kHz. The challenge is to enable robust and reliable communication in the...
The paper presents a simulation tool for the study of a dynamic IPT system. This simulator is able to provide information about the electrical components in function of the dynamic behavior of the vehicles during the charge operations. The results are used to investigate different possibilities for the improvement of the interfacing between the IPT system and the electrical grid to which it is connected.
In this paper, we experimentally validate the effects of different structures of metamaterial on efficiency enhancement in a four-coil magnetic resonant wireless power transfer system operating at 6.78MHz. First, we propose a concise design of magnetic metamaterials. A 6×6 planar array metamaterial slab is simulated to investigate its effect on power transmission between transmitter and receiver....
Near Field Communication (NFC) readers, ubiquitously embedded in smart-phones, buses and other infrastructures, are able to wirelessly deliver mW-level power to ultra-low power, passive NFC tags via a coupled magnetic field. Additionally, an NFC reader can leverage the coupled communication channel to support relatively heavy computational applications, such as sensing, visual displays, etc. Consequently,...
In maximal link efficiency IPT design, a fixed AC load value is required. For this reason, matching the value of the input impedance of the rectifier to the optimal AC load is necessary. This paper presents a current driven Class D rectifier with a resistance compression network for 6.78MHz IPT systems, in which the reflected AC load has a minimal variation for a wide range of DC output loads. Experimental...
A Moving Field Inductive Power Transfer (MFIPT) system for wireless inductive power supply of electric vehicles on the road is described. To minimize losses only those primary coils located below the secondary coil of a vehicle are excited. The dynamics, the power balance of the MFIPT system, and the costs for the implementation of the system are discussed.
In this paper, a novel matching circuit design method utilizing a genetic algorithm and measured S-parameters of randomly moved coils is discussed. From the analytical comparison of different matching circuit topology, the superiority of active matching circuit is suggested, and potentially there is 21.4 % improvement in wireless power transfer efficiency by using 4 cell active matching circuit, which...
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