Accurate Modeling of Coil Inductance for Near-Field Wireless Power Transfer

Khan, Sadeque Reza; Pavuluri, Sumanth Kumar; Desmulliez, Marc Phillipe Yves

doi:10.1109/tmtt.2018.2854190

Cited by 74 publications

(41 citation statements)

References 31 publications

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“…It is not necessary to search for the analytical form of Equation 18 12and (13), taking into account the uncertainties in Eqs. (17) and (18). For the coaxial direction, i.e., along the X(5, 0) → (35, 0) axis, a precise mapping of the theoretical course is visible.…”

Section: Mutual Inductance M and Coupling Factor Kmentioning

confidence: 99%

“…To determine the mutual inductance, the method presented by Soma et al [14] and used by [2,15,16] in the analysis of the efficiency of inductive energy transfer was applied. The works of [17,18] are its extension, introducing the possibility of a more precise analysis of multi-winding coils based on replacing the integral from Equation (6) with its development into the Taylor series. In accordance with [14], the mutual inductance M of two magnetically coupled coils that are separated from each other by (x, y, 0) can be determined as…”

Section: Mutual Inductance M and Coupling Factor Kmentioning

confidence: 99%

“…where K(r) and E(r) are complete elliptic integrals of the first and second type, respectively. The mutual inductance M is associated with the coupling factor k by formula (12) [16][17][18][19], which makes it possible to refer it to the inductance values of the Tx and Rx coils.…”

Section: Mutual Inductance M and Coupling Factor Kmentioning

confidence: 99%

See 2 more Smart Citations

2d Disturbance Map of Low-Power Front-End Circuits in Low Frequency Band

Oleszek¹

2019

PIER C

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This document presents an evaluation of a near-field contactless inductive link, examined from a radiated disturbance standpoint, whose sources are low-power Analog Front End (AFE) circuits. Two basic types of AFE rectifiers based on Shottky diodes and Mosfet transistors were tested. Due to selective interference measurement, a map of distortions regarding the position of the coil was created. The obtained results referred to the analytical model, providing sufficient convergence to quickly assess the optimum position of the receiving coil.

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Section: Mutual Inductance M and Coupling Factor Kmentioning

confidence: 99%

Section: Mutual Inductance M and Coupling Factor Kmentioning

confidence: 99%

See 1 more Smart Citation

2d Disturbance Map of Low-Power Front-End Circuits in Low Frequency Band

Oleszek¹

2019

PIER C

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“…In industrial application fields like wireless power transmission, air core planar spiral coils with constant screw pitches, namely Archimedean spiral coils, are commonly used as the magnetic coupling mechanism [13,14]. In the calculation of the mutual inductance of planar spiral coils, the circular coils approximation method is commonly used in the existing literature.…”

Section: Introductionmentioning

confidence: 99%

Accurate Expressions of Mutual Inductance and Their Calculation of Archimedean Spiral Coils

Liu

Lai

2019

Energies

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Considering the helicity of Archimedean spiral coils, this paper proposes accurate expressions of mutual inductance and their numerical calculation methods, which can be applied in the wireless power transmission field, etc. Accurate expressions of mutual inductance are deduced respectively for two coils that are coaxial, laterally misaligned, or non-parallel, and numerical calculations are performed using Gaussian integration as well. In the case of coaxial coils, the calculation results are verified by the 3D finite element method (3D FEM) and compared with the results gained by the traditional method that approximates two spiral coils to two clusters of series-connected circular coils ignoring helicity. The comparison of the three methods shows that results achieved by the proposed expression are close to that of 3D FEM, while there is increasing error with the screw pitches of the coils when using the traditional circular coil approximation method. The influence of relative position on the mutual inductance of the two coils is also studied and it is further explained through magnetic field distribution. Finally, the validity of the proposed expressions of mutual inductance is verified by experimental results.

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“…The alignment of the pickup coil, with respect to the primary coil, is the contingent course of action. The mutual inductance between the coils is affected by the misalignment, which, in turn, affects the resonance frequency of the system [23][24][25]. In other words, the exact resonance frequency of the system is decided by the misalignment between the coil.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Optimal Operating Frequency for Wireless EV Charging System under Misalignment

Varikkottil

2019

Electronics

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Wireless charging of electric vehicles is achieved by a resonance-enhanced inductive power transfer technique. In this paper, a new method is proposed for the estimation of the operating frequency under the contingency of misalignment of the pickup coil. Analytically, the mutual inductance between the primary and secondary coils is represented in terms of their vertical and horizontal displacements, using Neumann’s approximation formula. The operating frequency of the high-frequency inverter corresponds to the resonance condition, a function of the mutual inductance, which is decided by the coil misalignment. The obtained relations are corroborated with studies of simulations. The proposed method is validated by numerical simulation. A 1 kW experimental prototype is designed and tested. Experimental results corroborate the notion about the analytical expression.

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Accurate Modeling of Coil Inductance for Near-Field Wireless Power Transfer

Cited by 74 publications

References 31 publications

2d Disturbance Map of Low-Power Front-End Circuits in Low Frequency Band

2d Disturbance Map of Low-Power Front-End Circuits in Low Frequency Band

Accurate Expressions of Mutual Inductance and Their Calculation of Archimedean Spiral Coils

Estimation of Optimal Operating Frequency for Wireless EV Charging System under Misalignment

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