Wireless power transfer analysis of circular and spherical coils under misalignment conditions for biomedical implants

Palagani, Yellappa; Mohanarangam, Krithikaa; Shim, Jae Hoon; Choi, Jeong Ryeol

doi:10.1016/j.bios.2019.04.051

Cited by 28 publications

(10 citation statements)

References 26 publications

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“…Therefore, in addition to horizontal alignment, it is important to validate the performance of the inductive power link at varying distances between the coils and under different misalignment conditions. In our previous study [27], different types of misalignments and varied distances between coils are clearly discussed. L 3 lies horizontally with respect to L 1 and L 2 as shown in Figure 5a, and to validate the inductive power link performance for varied D 23 , the L 3 is varied from 45 mm to 55 mm at a step size of 1 mm along the z-axis.…”

Section: Power Transfer Efficiency In Heterogeneous Phantommentioning

confidence: 99%

Inductive Power Transfer Link at 13.56 MHz for Leadless Cardiac Pacemakers

et al. 2021

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Inductive power links are most viable for the long-term powering of cardiac pacemakers. Designing an inductive power link without surpassing the specific absorption rate (SAR) for modern leadless cardiac pacemakers (LCPs) remains a challenging task because of its size and implantation depth. The inductive power link employed in the conventional works is either designed at a high frequency or based on the size, shape, weight, and implantation depth of conventional cardiac pacemakers. Here, a 3-coil inductive power transfer link with a circular transmitter coil and solenoidal receiver coil is designed at 13.56 MHz to provide uninterrupted power to the modern LCPs. Considering the food and drug administration approved term for implant size of modern LCP, the receiver coil is designed with 6 mm diameter and 6.5 mm length. The performance of the link has been verified through simulations and measurements under perfect alignment, lateral and/or angular misalignments, and distance variation between the coils. At a 50 mm horizontal distance between transmitter and receiver coils, the transmission coefficient is −30.9 dB. The maximum simulated average SAR at heterogeneous phantom is 0.30 W/kg, which is lower than the limit set by the Federal Communications Commission for radiation threshold exposure. Experiments conducted on pork’s heart verified the reliability of the simulated results. At a 50 mm distance between the coils, the measured transmission coefficient is −34 dB, and at an input power of 1 W, the power delivered to the load is 0.7 mW.

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Section: Power Transfer Efficiency In Heterogeneous Phantommentioning

confidence: 99%

Inductive Power Transfer Link at 13.56 MHz for Leadless Cardiac Pacemakers

et al. 2021

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“…Kurs et al [10] reported WPT via magnetic resonance, and it realized highly efficient energy transport. After that, many papers have reported WPT on various application, for example kitchen appliances [11], biomedical implants [12], [13], and satellites on space [14]. Particularly, many researchers are interested in EVs, and they use WPT to improve efficiency of energy transfer, oscillation problem, and atmospheric pollution [15]- [18].…”

Section: Introductionmentioning

confidence: 99%

Auto tuning of frequency on wireless power transfer for an electric vehicle

Yamaguchi¹,

Iida²

2022

IJECE

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<p>In these days, electric vehicles are enthusiastically researched as a countermeasure to air pollution, although these do not have practicality compared to gasoline-powered vehicles. The aim of this study is to transport energy wirelessly and efficiently to an electric vehicle. To accomplish this, we focused on frequency of an alternating current (AC) power supply, and suggested a method which determined the value of it constantly. In particular, a wireless power transfer circuit and a lithium-ion battery in an electric vehicle were expressed with an equivalent circuit, and efficiency of energy transfer was calculated. Furthermore, the optimal frequency which maximizes efficiency was found, and the behavior of voltage was demonstrated on a secondary circuit. Finally, we could obtain the larger electromotive force at the secondary inductor than an input voltage.</p>

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“…Planar spiral coils have been widely adopted in many electromagnetic applications ranging from low power such as mobile phones, electric toothbrushes, and biomedical implants [1][2][3][4][5][6][7][8][9][10] to the high-power drone charging systems and electric vehicles. The wireless power transfer (WPT) method was employed to transfer power between these coils [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Simplified Mutual Inductance Calculation of Planar Spiral Coil for Wireless Power Applications

Hussain

Woo

2022

Sensors

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In this paper, a simplified method for the calculation of a mutual inductance of the planar spiral coil, motivated from the Archimedean spiral, is presented. This method is derived by solving Neumann’s integral formula in a cylindrical coordinate system, and a numerical tool is used to determine the value of mutual inductance. This approach can calculate the mutual inductances accurately at various coaxial and non-coaxial distances for different coil geometries. The calculation result is compared with the 3D finite element analyses to verify its accuracy, which shows good consistency. Furthermore, to confirm it experimentally, Litz wire is used to fabricate the sample spiral coils. Finally, the comparison of a simplified method is also studied relative to the coupling coefficient. The accuracy of the calculation results with the simulation and the measurement results makes it a good candidate to apply it in wireless power applications.

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Wireless power transfer analysis of circular and spherical coils under misalignment conditions for biomedical implants

Cited by 28 publications

References 26 publications

Inductive Power Transfer Link at 13.56 MHz for Leadless Cardiac Pacemakers

Inductive Power Transfer Link at 13.56 MHz for Leadless Cardiac Pacemakers

Auto tuning of frequency on wireless power transfer for an electric vehicle

Simplified Mutual Inductance Calculation of Planar Spiral Coil for Wireless Power Applications

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