Optimal coil size ratios for wireless power transfer applications

Waters, Benjamin H.; Mahoney, Brody J.; Lee, Gunbok; Smith, Joshua R.

doi:10.1109/iscas.2014.6865567

Cited by 72 publications

(48 citation statements)

References 7 publications

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“…Moreover, the resistance is also affected by the operational frequency whereas the inductance and the capacitance are assumed to be constant in a wide range of frequencies. Specifically, the self-inductance of a coil may be approximated by Wheeler's model or Waters' model [29].…”

Section: Coil Design In Scmr Systemsmentioning

confidence: 99%

A Review on the Fundamentals and Practical Implementation Details of Strongly Coupled Magnetic Resonant Technology for Wireless Power Transfer

Triviño-Cabrera

Aguado

2018

Energies

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Users are increasing their demands on the home appliances they utilize by requiring them to be powered anywhere and anytime. In order to satisfy this need, wireless power transfer helps transfer energy between objects without conductors. For domestic scenarios, strongly magnetic resonant technology offers a method to enable wireless power transfer, even when there exist intermediate non-metallic objects between the wireless power source and the load. This paper reviews this technology with a comprehensive explanation about its fundamentals and physical principles. Some practical issues are also analyzed in this work. Particularly, how the control can be designed and how the coils are built. Finally, this paper also addresses the study about the features of other technologies to power home appliances without conductors. They can be foreseen as the technological competitors of strongly coupled magnetic resonant systems.

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Section: Coil Design In Scmr Systemsmentioning

confidence: 99%

A Review on the Fundamentals and Practical Implementation Details of Strongly Coupled Magnetic Resonant Technology for Wireless Power Transfer

Triviño-Cabrera

Aguado

2018

Energies

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“…Self-inductance of a circular spiral coil can be calculated using (2.a) when N is large and p>>r o [10]. For the inductance calculation of single loop spiral (N=1) (2.b) is used [11].…”

Section: ) Inductancementioning

confidence: 99%

Analysis on normalized distance and scalability in designing wireless power transfer

Sampath

Alphones

Kenneth

et al. 2015

2015 IEEE PELS Workshop on Emerging Technologies: Wireless Power (2015 WoW)

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Wireless power transfer (WPT) technology has been applied in a wide range of applications. However, directly comparing dissimilar designs with respect to PTE and transfer distance is misleading due to the differences in the design parameters. The term normalized distance has been proposed to compare diverse designs with different coil sizes and transfer distances. This paper presents an analysis on normalized distance and scalability of WPT systems considering maximum power transfer efficiency, transmitter (Tx) and receiver (Rx) coil radii and transfer distance. Merits of normalized distance and its limitations are investigated. Results in this paper propose to define more generalize term for normalized distance incorporating transfer distance, Tx and Rx coil radii, ratio between Tx, Rx coil radii and number of turns in each coil.

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“…To design coils and enhance the PTE, many techniques have been proposed, such as changing the coil topologies [7][8][9] and increasing coil sizes [10,11]. Therefore, different shapes and calculation methods of planar spirals are proposed [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Losses in Printed Rectangular Coils for Compact Wireless Power Transfer Systems

Chaimool¹,

Rakluea²,

Akkaraekthalin³

et al. 2019

PIER C

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Development and optimization of printed spiral coils have significant impacts on the power transfer efficiency (PTE) and operating range for magnetic resonant wireless power transfer (WPT) applications. In this paper, the effects of different material losses (substrate and conducting coating) of printed coils are considered and experimentally studied. For the purposes of comparison and finding the dominating losses, lossy loaded capacitors with equivalent series resistances have also been investigated. A four-coil system with an external capacitor-loaded (ECL) magnetic resonant WPT system is considered, and a self-resonant coil is designed and compared. Results show that the ECL resonant coil has higher PTE than the self-resonant coil with the same size and distance between the transmitting and receiving coils. Through observing the simulated results and analyzing experimental data, it can be concluded that the dominant cause of the decrease in PTE of this ECL-WPT system is the strip resistive loss of coil of 57% (0.891 dB) and the ohmic loss in ECL of 37% (0.568 dB). Meanwhile, the substrate loss significantly impacts on the PTE of the self resonant coil. The overall measured PTE is about 66% of the ECL coil at a distance of 50 mm when the above loss factors are considered. The measured results are in good agreement with the analysis and simulations.

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Optimal coil size ratios for wireless power transfer applications

Cited by 72 publications

References 7 publications

A Review on the Fundamentals and Practical Implementation Details of Strongly Coupled Magnetic Resonant Technology for Wireless Power Transfer

A Review on the Fundamentals and Practical Implementation Details of Strongly Coupled Magnetic Resonant Technology for Wireless Power Transfer

Analysis on normalized distance and scalability in designing wireless power transfer

Effect of Losses in Printed Rectangular Coils for Compact Wireless Power Transfer Systems

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