Abstract
Magnetic beamforming techniques can enhance the power transfer efficiency using focused magnetic fields by the multiple transmitters to the receivers. However, the intra-couplings that cause power leakage and phase distortion among the arrayed coils inevitably occur due to the deployment of coils having strong couplings between each other. Here, we analyze the adverse influences of intra-couplings and present the advantages of magnetically independent transmitters for multiple-inputs and single-output (MISO) WPT. The independent coil array can achieve focused magnetic fields by simply adjusting the amplitude of the transmitter voltage source without phase adjustment. The system also can eliminate the reactive power with the independent coil array to efficiently use the supplying power from the source. The analytical studies are verified by numerical and circuit simulation and experiments. Our analysis can be generalized to the MISO-WPT with an arbitrary number of transmitters. It can provide insight into designing and implementing the MISO-WPT applying magnetic beamforming.
Highlights
This paper analyzes the influences caused by intra-couplings of the transmitter array in the multipleinputs and single-output (MISO)-Wireless power transfer (WPT) when applying magnetic beamforming
The influences caused by the intra-couplings are summarized as follows: (1) the intracouplings cause amplitude and phase adjustment of a beamforming voltage, and (2) the intra-couplings cause power factor attenuation of each transmitter
The advantages when the transmitters become magnetically independent are derived: the magnetic beamforming is achieved by only adjusting the amplitude of transmitter voltage without phase adjustment, and the power factor becomes unity
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The above studies achieved outstanding results, the applicable industries were limited due to the massive size of the coil Another solution to improve the magnetic field-based WPT’s efficiency and charging range is deploying a transmitter array configured as multiple coils [13]. Magnetic beamforming is a promising technology that achieves the maximum PTE in the multiple-inputs and single-output (MISO) and MIMO-WPT by focusing the magnetic fields from the multiple transmitters to the receiver [15]. For this reason, many studies have been carried out from various perspectives to analyze the effect of the intra-couplings on the WPT: a leakage magnetic field [16], an efficiency attenuation [17], and multiple resonant frequencies [13].
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