Bipolar Spiral Midfield Wireless Power Transfer for Cardiac Implants Application

Le-Huu, Hoang; Seo, Chulhun

doi:10.1109/lawp.2021.3092011

Cited by 22 publications

(7 citation statements)

References 15 publications

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“…Moreover, optimal current distribution and the focusing field were obtained by using multiple excitation port and a controllable circuit, which remains the system's complexity. In [17], [18], the Tx sources using the aperture-coupled excitation method were implemented. However, the Rx?s rotation was investigated on only the Ox axis.…”

Section: Introductionmentioning

confidence: 99%

Anti-Symmetric Wing Transmitter for Angular Misalignment Insensitive Wireless Power Transfer to Biomedical Implants

Le-Huu

Seo

2023

IEEE Access

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This paper presents an anti-symmetric wing transmitter (ASW-Tx) for angular misalignment insensitive WPT to biomedical implants. Symmetrical field distribution on two orthogonal planes of Oxz and Oyz are analyzed theoretically to obtain stable power transfer efficiency (PTE) by rotating Rx around the Oz axis. Moreover, toroidal magnetic fluxes are generated by ASW to adapt with different Rx's tilted angles on Ox and Oy axes. An impedance matching network (IMN) is proposed and implemented to match ASW-Tx's impedance to source impedance. An implantable Rx is employed to verify the ASW-Tx's performance. Experimental measurements are carried out with selected Rx's tilted angles (vary from 0 o to 90 o around Ox, Oy, and Oz axis) to validate the effectiveness of proposed ASW-Tx's. Verification results show that a stable efficiency variation was achieved with a maximum fluctuation of 4dB by rotating Rx tilted angles. Moreover, the ASW-Tx can supply power effectively with a transmission efficiency of up to −18.4dB to an implantation depth of 15mm. INDEX TERMS Anti-symmetric wing transmitter (ASW-Tx), biomedical implants, impedance matching network (IMN), misalignment tolerance, Wireless Power Transfer (WPT).

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Section: Introductionmentioning

confidence: 99%

Anti-Symmetric Wing Transmitter for Angular Misalignment Insensitive Wireless Power Transfer to Biomedical Implants

Le-Huu

Seo

2023

IEEE Access

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“…Considering the listed limitations and the initial stage of capacitive WPT research for underwater power transfer, so the application of wireless power transfer in underwater environments will focus on more matured Inductive WPT technologies. This technology was first used in air medium, wireless charging pile position of electric vehicles in transportation field [23,24], pocket wireless charger of the miniature electronic pacemaker in the medical field [25,26], and wireless transmission of industrial field and smart homes [27,28]; however it has gradually been extended to seawater medium owing to advancement and high demand for this technology [29,30]. Due to the particular complexity of seawater environment, wireless power transfer is faced with serious electromagnetic wave attenuation [31,32], irregular disturbance of seawater ocean current, difficult docking of charging equipment and other problems [33,34], and its efficient transmission has not been fundamentally solved [35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Review of low‐loss wireless power transfer methods for autonomous underwater vehicles

Zhang

Xu²,

Lu³

et al. 2022

IET Power Electronics

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Comprehensive research on the wireless power transfer technology of autonomous underwater vehicles is necessary to address the issue of significant energy loss in such vehicles during wireless power transfer. Previous analysis on factors that affect wireless power transfer in seawater environment demonstrated that the eddy current loss generated during transmission and offset of the coupling mechanism are the main factors that degrade the efficiency. In this study, existing literature on wireless power transfer for autonomous underwater vehicles in recent years is reviewed, and it is concluded that the energy loss during underwater wireless power transfer can be effectively reduced through coupling mechanism optimization, adaptive control, and docking device design. This study analyses the challenges of low-loss wireless power transfer for autonomous underwater vehicles and the prospects for future development trends and research areas, providing a reference for realizing efficient and flexible energy supply for autonomous underwater vehicles.

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“…In between, mid-field WPT is much more efficient than farfield methods and reach larger distances than inductive coupling. Mid-field WPT is especially advantageous for deep-implanted devices such as pacemakers [8], [9], and brain stimulators [10].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Efficiency and Dosimetry of Buffered On-body Transmitter Antennas for Wireless Powering of In-body Devices

Soares

Skrivervik

Nikolayev

2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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The viable and safe application of wireless power transfer for powering bioelectronic implants requires understanding the wave propagation in heterogeneous and dispersive media, the electromagnetic exposure assessment, and the optimum design of the system parameters to achieve a trade-off between efficiency and specific absorption rate levels. Therefore, based on the case study of a wirelessly charged deep-implanted pacemaker, a parametric analysis on the transmitter dimensions and electromagnetic properties is carried out to achieve such a trade-off. The results show that the system reaches the maximum efficiency without increasing SAR levels when the transmitter is composed of an electric source, an air-like substrate, and a superstrate matched to the wave impedance in the skin with a thickness of half the wavelength in this medium. Furthermore, this configuration is compared to a magnetic counterpart, and the reasons for its suboptimal performance are investigated in terms of near-field, reflection, and attenuation losses.

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Bipolar Spiral Midfield Wireless Power Transfer for Cardiac Implants Application

Cited by 22 publications

References 15 publications

Anti-Symmetric Wing Transmitter for Angular Misalignment Insensitive Wireless Power Transfer to Biomedical Implants

Anti-Symmetric Wing Transmitter for Angular Misalignment Insensitive Wireless Power Transfer to Biomedical Implants

Review of low‐loss wireless power transfer methods for autonomous underwater vehicles

Theoretical Efficiency and Dosimetry of Buffered On-body Transmitter Antennas for Wireless Powering of In-body Devices

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