Coil design guidelines for high efficiency of wireless power transfer (WPT)

Sampath, J.P.K.; Alphones, A.; Shimasaki, Hitoshi

doi:10.1109/tencon.2016.7848098

Cited by 53 publications

(29 citation statements)

References 15 publications

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“…The upper limit for N p-rp is determined by the physical size of the torus. There should be a sufficient gap between the turns close to the wire diameter to avoid unwanted high proximityeffect losses [22]. Therefore, based on the above analysis, we chose N p-rp = 20 and N t-rp = 3.…”

Section: B Design Example and Simulation Resultsmentioning

confidence: 99%

Self-Tuning Omnidirectional Wireless Power Transfer Using Double-Toroidal Helix Coils

Jayathurathnage

Dang

Simovski

et al. 2022

IEEE Trans. Ind. Electron.

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We suggest and study a novel omnidirectional wireless power transfer (WPT) system based on unusual double toroidal helix coils. The suggested antenna is a double-helix coil wounded around a torus. It creates two mutually orthogonal magnetic fields. One is toroidal and confined inside the torus, another one is poloidal and is distributed outside it. The intensities of these two fields can be independently tuned via the geometry of the turns. The coupling coefficients are tailored to ensure high efficiency regardless of the receiver position and orientation, without active circuitry for tuning or control. This topology provides self-tuning functionality which is achieved when the coupling between the transmitter and receiver is minimized while the coupling in the pairs transmitterrepeater and repeater-receiver is strong. The system consists of three transmitter-repeater pairs orthogonal to each other, ensuring omnidirectional functionality. Experimental results confirm self-tunability and high efficiency for any position and orientation of receivers. The proposed doublehelix antenna is applicable to different WPT applications where the coupling/decoupling between coils can be freely controlled.

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Section: B Design Example and Simulation Resultsmentioning

confidence: 99%

Self-Tuning Omnidirectional Wireless Power Transfer Using Double-Toroidal Helix Coils

Jayathurathnage

Dang

Simovski

et al. 2022

IEEE Trans. Ind. Electron.

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“…Their coupling is sensitive to the relative orientation of the coils, and the efficiency can drop to nearly zero when the coils are orthogonal to each other. These systems can support transmission of large amounts of power (up to 10 W) under safety limits [104,105]. However, their performance rapidly degrades when the dimensions of the receiver become much smaller than the operating depth.…”

Section: (B) Near-fieldmentioning

confidence: 99%

Wireless interfaces for brain neurotechnologies

Kim

2022

Phil. Trans. R. Soc. A.

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Wireless interfaces enable brain-implanted devices to remotely interact with the external world. They are critical components in modern research and clinical neurotechnologies and play a central role in determining their overall size, lifetime and functionality. Wireless interfaces use a wide range of modalities—including radio-frequency fields, acoustic waves and light—to transfer energy and data to and from an implanted device. These forms of energy interact with living tissue through distinct mechanisms and therefore lead to systems with vastly different form factors, operating characteristics, and safety considerations. This paper reviews recent advances in the development of wireless interfaces for brain neurotechnologies. We summarize the requirements that state-of-the-art brain-implanted devices impose on the wireless interface, and discuss the working principles and applications of wireless interfaces based on each modality. We also investigate challenges associated with wireless brain neurotechnologies and discuss emerging solutions permitted by recent developments in electrical engineering and materials science. This article is part of the theme issue 'Advanced neurotechnologies: translating innovation for health and well-being'.

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“…Therefore, we first determined the parameters of the receiver coil and then determined those of the transmitter coil to achieve the appropriate transmission efficiency. The coil pitch was determined to be two times the wire diameter; this was optimal considering the quality factor of the coil [24]. We also used the calculation model for the inductance and coupling coefficient of the coil by the filament method [25] and the calculation model for the parasitic resistance of the coil [26].…”

Section: Coil Designmentioning

confidence: 99%

Wireless Power Transfer System for Mobile Robots via Magnetic Resonant Coupling with Impedance Matching

Hijikata

OHORI

et al. 2022

Preprint

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Wireless power transfer via magnetic resonant coupling can be used to supply power to a mobile robot within a few meters of a transmitter coil. However, when the robot moves or its power consumption fluctuates, its input impedance varies and causes power reflection. Therefore, we propose the use of a driver coil on the transmitter side to match the input impedance. The input impedance is matched and power reflection is eliminated by regulating the coupling coefficient between the driver and the transmitter. During experiments, the transmitting efficiency showed good agreement with the calculated value, and the input impedance was matched under varying distances and load resistances. Therefore, the proposed system was demonstrated to solve the power reflection problem in mobile robots.

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Coil design guidelines for high efficiency of wireless power transfer (WPT)

Cited by 53 publications

References 15 publications

Self-Tuning Omnidirectional Wireless Power Transfer Using Double-Toroidal Helix Coils

Self-Tuning Omnidirectional Wireless Power Transfer Using Double-Toroidal Helix Coils

Wireless interfaces for brain neurotechnologies

Wireless Power Transfer System for Mobile Robots via Magnetic Resonant Coupling with Impedance Matching

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