New AC resistance calculation of printed spiral coils for wireless power transfer

Qian, Gaorong; Cheng, Yuhua; Chen, Guoxiong; Wang, Gaofeng

doi:10.1109/isqed.2018.8357302

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…Resistance due to the nearness of neighbouring conductors or current crowding impact is caused by the currents induced by the magnetic fields from other coil turns. The proximity-effect resistance (Rprox) can be expressed as 20,23 . n H represents the magnetic field perpendicular to the surface of the turn under the current excitation of 1A.…”

Section: Proximity-effect Resistance (Rprox)mentioning

confidence: 99%

“…Thus, increasing the spacing of between neighbouring coil turns stretches the coil over a longer length (l) which increases the resistance of the conductor as expressed in equation (15). Thus, widening the spacing between coil turns results in magnetic field leaking out of the coil and creating more opposition to magnetic field linking other neighbouring coil turns which increases resistance of the coil 12,20 .…”

Section: Parametric Analysis With Coil Pitch Variationmentioning

confidence: 99%

“…Skin-effect resistance (Rskin) and proximity-effect resistance (Rprox) makes up the total resistance (Rtotal) in the planar coil 12,22 . The former takes place when AC current supplied into the conductor gathers at its edges, increasing its resistance, whiles the latter happens when the magnetic fields from the current of nearby conductors generate eddy current in the nth turn of the conductor 20 as illustrated in Fig. 6(a).…”

Section: (B)mentioning

confidence: 99%

“…The mutual inductances (i.e., positive, and negative) between two parallel neighbouring coil turns with lengths li and lj can be calculated as given in 20 . The positive mutual inductance, Mu+ and the distance (Dmax) between the coil turns is given as…”

Section: Q-factor Modelling a Modelling Of Inductance (L)mentioning

confidence: 99%

See 3 more Smart Citations

Novel Coil Design and Analysis for High-Power Wireless Power Transfer with Enhanced Q-Factor

Awuah

Danuor

Moon

et al. 2023

Preprint

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The power transfer efficiency (PTE) is a crucial aspect for effective wireless power transfer (WPT) applications. The quality factor (Q) of the WPT coil plays a critical role in ensuring higher PTE. In this paper, a novel method of improving the Q of a WPT coil is proposed. Resistance reduction techniques are presented which involves variation of the trace pitch, width, and thickness. This approach targets the high AC losses centered in the inner turns, which subsequently results in an increased Q. Numerical analysis with respect to the inductance and resistance models are presented, analyzed, and compared to that of the EM simulation results. To verify the efficacy of the proposed coil structure, a prototype is fabricated where good agreement is achieved between the measured and simulated results. The proposed coil attained a quality factor increment of about 19.24% at 85 kHz in comparison to the conventional one. The proposed technique can be used to optimize planar spiral coils to attain higher Q.

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Section: Proximity-effect Resistance (Rprox)mentioning

confidence: 99%

Section: Parametric Analysis With Coil Pitch Variationmentioning

confidence: 99%

Section: (B)mentioning

confidence: 99%

Section: Q-factor Modelling a Modelling Of Inductance (L)mentioning

confidence: 99%

See 2 more Smart Citations

Novel Coil Design and Analysis for High-Power Wireless Power Transfer with Enhanced Q-Factor

Awuah

Danuor

Moon

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…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]. Due to geometric limitations, increasing Q is one approach to improving the overall PTE when the overall size of the coil is restricted.…”

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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500 MHz high resolution proximity sensors with fully integrated digital counter

Farsi

Solmaz

Khosropour³

et al. 2023

Measurement

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New AC resistance calculation of printed spiral coils for wireless power transfer

Cited by 9 publications

References 18 publications

Novel Coil Design and Analysis for High-Power Wireless Power Transfer with Enhanced Q-Factor

Novel Coil Design and Analysis for High-Power Wireless Power Transfer with Enhanced Q-Factor

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

500 MHz high resolution proximity sensors with fully integrated digital counter

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