Separation-Misalignment Insensitive WPT System Using Two-Plane Printed Inductors

Alshhawy, Shimaa; Barakat, Adel; Yoshitomi, Kuniaki; Pokharel, Ramesh K.

doi:10.1109/lmwc.2019.2935621

Cited by 21 publications

(6 citation statements)

References 18 publications

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“…A major limitation of conventional WPT systems is their sensitivity to misalignment 5 , 6 , 24 , 25 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This decrease in the transmission coefficient results from the reduction of the magnetic coupling. Magnetic coupling reduction leads to both mismatch losses as well as reduction of the maximum obtainable efficiency 5 , 6 , 24 , 25 . The improvement in efficiency performance of the proposed metamaterial inspired WPT system during lateral misalignment is considered as proof of the magnetic field enforcement in the z-direction as discussed in the prior Sections.…”

Section: Resultsmentioning

confidence: 99%

“…Sensitivity to misalignment effects 5 , 6 , 24 , 25 is a major issue in WPT systems including the inductively coupled one. Misalignment is caused by the change of vertical separation between transmitter (TX) and receiver (RX), lateral shift between their axes, angular change from their axes, or a combination of these types.…”

Section: Introductionmentioning

confidence: 99%

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Wireless power transfer system rigid to tissue characteristics using metamaterial inspired geometry for biomedical implant applications

Pokharel

Barakat

Alshhawy

et al. 2021

Sci Rep

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Conventional resonant inductive coupling wireless power transfer (WPT) systems encounter performance degradation while energizing biomedical implants. This degradation results from the dielectric and conductive characteristics of the tissue, which cause increased radiation and conduction losses, respectively. Moreover, the proximity of a resonator to the high permittivity tissue causes a change in its operating frequency if misalignment occurs. In this report, we propose a metamaterial inspired geometry with near-zero permeability property to overcome these mentioned problems. This metamaterial inspired geometry is stacked split ring resonator metamaterial fed by a driving inductive loop and acts as a WPT transmitter for an in-tissue implanted WPT receiver. The presented demonstrations have confirmed that the proposed metamaterial inspired WPT system outperforms the conventional one. Also, the resonance frequency of the proposed metamaterial inspired TX is negligibly affected by the tissue characteristics, which is of great interest from the design and operation prospects. Furthermore, the proposed WPT system can be used with more than twice the input power of the conventional one while complying with the safety regulations of electromagnetic waves exposure.

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“…A major limitation of conventional WPT systems is their sensitivity to misalignment 5 , 6 , 24 , 25 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Wireless power transfer system rigid to tissue characteristics using metamaterial inspired geometry for biomedical implant applications

Pokharel

Barakat

Alshhawy

et al. 2021

Sci Rep

Self Cite

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show abstract

“…In addition, the transmission efficiency is also affected by any positional misalignments of the coil [16]. A coil structure and configuration have been proposed because shifts in the coil position between the transmitting and the receiving sides significantly reduce the efficiency [17,18]. Suppressing the influence of coil misalignment is also expected because the magnetic flux path control technology improves the mutual inductance between the two coilss.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Magnetic Composite Material on Copper Loss Reductions and Misalignment in Copper‐Plate‐Coils for Wireless Power Transmission

Sato

Endo

et al. 2021

IEEJ Transactions Elec Engng

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Wireless power transmission systems are suitable for use in charging systems for plug‐in hybrid vehicles and electric vehicles, particularly when considering safety and convenience. Wireless power transmission coils are made of litz copper wire to reduce copper losses at high frequencies. However, litz wires are expensive owing to their complicated structure and large number of manufacturing steps. Herein, a copper‐plate‐coil is proposed that can be manufactured at a low cost is proposed. A magnetic flux path control technique is also proposed to reduce copper losses. The use of a magnetic composite material for realizing magnetic flux path control technology reduces the alternative current resistance by 50%. In addition, this study reports the effects of the magnetic composite material on coupling coefficients observed during coil misalignment. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…Scholars have adopted various methods to solve this problem [7][8][9][10][11][12][13][14][15][16][17][18]. In [7][8][9][10][11], a reconfigurable resonator and numerous transmission coil arrays with different structures have been used to improve transmission efficiency. A relatively complete mutual inductance model for analyzing magnetically coupled resonant technology was established.…”

Section: Introductionmentioning

confidence: 99%

A New Arrangement of Active Coils for Wireless Charging of UAV

Wang

et al. 2021

Energies

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This paper presents the design and optimization of a wireless power transfer (WPT) charging system based on magnetically coupled resonant technology, applied to an Unmanned Aerial Vehicle (UAV). In this paper, a charging system, including dual active transmitter coils and a single receiver coil, is proposed. The dual transmitting coils adopt a coaxial structure with different radii. This structure simplifies the calculation of the complex mutual inductance between the coils to a function of mutual inductance only related to the value of the radial misalignment. Aiming toward a constant charging power, the optimal transmission efficiency of electric energy is achieved by controlling the input voltages of the active coils, which are solved via a set of equations defined as Lagrange multipliers. The simulation results of the 570 V and 85,000 Hz system verified the validity of the proposed wireless UAV charging scheme.

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Separation-Misalignment Insensitive WPT System Using Two-Plane Printed Inductors

Cited by 21 publications

References 18 publications

Wireless power transfer system rigid to tissue characteristics using metamaterial inspired geometry for biomedical implant applications

Wireless power transfer system rigid to tissue characteristics using metamaterial inspired geometry for biomedical implant applications

Effectiveness of Magnetic Composite Material on Copper Loss Reductions and Misalignment in Copper‐Plate‐Coils for Wireless Power Transmission

A New Arrangement of Active Coils for Wireless Charging of UAV

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