Analysis and Implementation of 3D Magnetic Field Shaping via a 2D Planar Transmitting Coil Array

Wireless power transfer (WPT) systems operating at several MHz are known to be advantageous for realizing high spatial freedom of power transfer and compact and lightweight designs. The combined use of multiple transmitting (Tx) coils for magnetic field shaping is expected to further increase the sp...

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Vydáno v:IEEE transactions on power electronics Ročník 37; číslo 1; s. 1172 - 1184
Hlavní autoři: Kang, Ning, Shao, Yaoxia, Liu, Ming, Ma, Chengbin
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.01.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
3D space
Arrays
Coils (windings)
Couplings
Cross coupling
cross coupling minimization
Layout
magnetic field shaping
Magnetic fields
Magnetic separation
Phasors
planar transmitting-coil array
Receivers
Shape
Three-dimensional displays
Transmitters
wireless power transfer (WPT)
Wireless power transmission
ISSN:0885-8993, 1941-0107
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Shrnutí:Wireless power transfer (WPT) systems operating at several MHz are known to be advantageous for realizing high spatial freedom of power transfer and compact and lightweight designs. The combined use of multiple transmitting (Tx) coils for magnetic field shaping is expected to further increase the spatial freedom. This article studies an extendable planar Tx-coil array architecture. This architecture provides new conveniences for the MHz WPT systems to efficiently charge devices in 3D space. Time-domain and phasor-domain modelings are carried out in turn to analyze the magnetic field shaping effect under the current phase shift modulation of the Tx coils. An overlap design of the Tx-coil layout is also developed to minimize the cross coupling between the coils, which reduces the interference between Tx coils. Finally, the above concepts are experimentally implemented. The results clearly demonstrate the new advantages of the planar Tx-coil array-based magnetic field shaping, in terms of spatial freedom of the power transfer, efficiency, and output power capability, when charging receivers with six-degrees-of-freedom positions and orientations in 3D space. For instance, a perpendicular receiver in the center of the Tx-coil array can be charged with 82% dc-dc efficiency and 45 W, which is difficult for a conventional single Tx-coil solution.
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ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3104883