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Article

Analysis on Influences of Intra-Couplings in a MISO Magnetic Beamforming Wireless Power Transfer System

1
Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), 333 Techno Jungang-daero, Hyeonpung-eup, Dalseong-gun, Daegu 42988, Korea
2
Department of Electrical and Computer Engineering, National University of Singapore (NUS), 21 Lower Kent Ridge Rd, Singapore 119077, Singapore
3
Department of Radio Communication Engineering, Korea Maritime and Ocean University (KMOU), 727 Taejong-ro, Yeongdo-gu, Busan 49112, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Alon Kuperman
Energies 2021, 14(16), 5184; https://doi.org/10.3390/en14165184
Received: 21 June 2021 / Revised: 27 July 2021 / Accepted: 17 August 2021 / Published: 22 August 2021
(This article belongs to the Special Issue Wireless Power Transfer and RF Technologies)
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. View Full-Text
Keywords: wireless power transfer (WPT); magnetic beamforming; intra-couplings of transmitter array; magnetically independent transmitter array; non-coupling wireless power transfer (WPT); magnetic beamforming; intra-couplings of transmitter array; magnetically independent transmitter array; non-coupling
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MDPI and ACS Style

Kim, K.; Kim, H.-J.; Seo, D.-W.; Choi, J.-W. Analysis on Influences of Intra-Couplings in a MISO Magnetic Beamforming Wireless Power Transfer System. Energies 2021, 14, 5184. https://doi.org/10.3390/en14165184

AMA Style

Kim K, Kim H-J, Seo D-W, Choi J-W. Analysis on Influences of Intra-Couplings in a MISO Magnetic Beamforming Wireless Power Transfer System. Energies. 2021; 14(16):5184. https://doi.org/10.3390/en14165184

Chicago/Turabian Style

Kim, Kyungtae, Han-Joon Kim, Dong-Wook Seo, and Ji-Woong Choi. 2021. "Analysis on Influences of Intra-Couplings in a MISO Magnetic Beamforming Wireless Power Transfer System" Energies 14, no. 16: 5184. https://doi.org/10.3390/en14165184

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