Analysis of the Mutual Inductance of Planar-Lumped Inductive Power Transfer Systems

Acero, J.; Carretero, C.; Lope, Ignacio; Alonso, R.; Lucía, Óscar; Burdío, J.M.

doi:10.1109/tie.2011.2164772

Cited by 144 publications

(61 citation statements)

References 37 publications

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“…The inductively coupled area of square shaped coils is larger in comparing with circular shaped coils of the same size. However, the mutual inductance between the circular shaped coils is higher than between the square shaped coils [40].…”

Section: Description Of Coil Designmentioning

confidence: 92%

“…This is mainly required for safety reasons. Since the power is transferred at high frequencies (up to tens of kHz range) induction heating phenomena can occur [40]. In order to avoid this, ferrite bars or plates can be placed above the inductive coils.…”

Section: Description Of Coil Designmentioning

confidence: 99%

“…This approach eliminates power pulsations and results in higher power output. Thus, the distance between adjacent transmitters must be selected precisely and accurately [40]. Approaches to transfer power in an efficient manner in magnetic resonant coupling for different configurations of transmitter and receiver coils are shown in the study of [41,42].…”

Section: Introductionmentioning

confidence: 99%

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Precise Analysis on Mutual Inductance Variation in Dynamic Wireless Charging of Electric Vehicle

et al. 2018

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Abstract:Wireless power transfer provides an opportunity to charge electric vehicles (EVs) without electrical cables. Two categories of this technique are distinguished: Stationary Wireless Charging (SWC) and Dynamic Wireless Charging (DWC) systems. Implementation of DWC is more desirable than SWC as it can potentially eliminate challenges associated with heavy weight batteries and time-consuming charging processes. However, power transfer efficiency and range, lateral misalignment of coils as well as implementation cost are issues affecting DWC. These issues need to be addressed through developing coil architectures and topologies as well as operating novel semiconductor switches at higher frequencies. This study presents a small-scale dynamic wireless power transfer system for EV. It specifically concentrates on analyzing the dynamic mutual inductance between the coils due to the misalignment as it has significant influence on the EV charging process, particularly, over the output power and overall efficiency. A simulation study is carried out to explore dynamic mutual inductance profile between the transmitter and receiver coils. Mutual inductance simulation results are then verified through practical measurements on fabricated coils. Integrating the practical results into the model, an EV DWC power transfer simulation is conducted and the relation between dynamic mutual inductance and output power are discussed technically.

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Section: Description Of Coil Designmentioning

confidence: 92%

Section: Description Of Coil Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precise Analysis on Mutual Inductance Variation in Dynamic Wireless Charging of Electric Vehicle

et al. 2018

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“…It can be used for powering electric vehicles [1][2][3][4][5][6][7], monorail systems [8][9][10], mobile phones [11,12], and other low power mobile devices [13][14][15]. In general, inductive system [2,12] uses a transmitter and receiver coil where ferrite cores are often used to improve wireless power transfer [3,16]. When designing an inductive system, two important parameters, the coupling coefficient and value of magnetic flux density in terms of proper shielding should be thoroughly considered.…”

Section: Introductionmentioning

confidence: 99%

“…However, NiZn material has lower eddy current losses what is particularly important in high frequencies range over 100 kHz where losses are the main factor of interest [24]. Ferrite core geometry [1,9,16,25] has also a huge impact on the value of the coupling coefficient, therefore optimal geometry should be chosen. Most common ferrite core geometries used in inductive system are: plates [6,15,26], pot cores, [27,28], E-cores [8,11], and U-cores [9].…”

Section: Introductionmentioning

confidence: 99%

Optimization, design, and modeling of ferrite core geometry for inductive wireless power transfer

Strauch

Pavlin

Bregar

2015

International Journal of Applied Electromagnetics and Mechanics

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Abstract. This paper presents a new design of ferrite core made of ferrite bars positioned in radial geometry. New core design is used in inductive wireless power transfer where the optimal design of ferrite bars was analyzed. Numerical simulations of seven ferrite bars geometries were performed in 3D models using Comsol Multiphysics in terms of the coupling coefficient. Two optimal designs of three and nine ferrite bars geometries were used for parameterization of geometric parameters. Both simulations of three and nine ferrite bars geometries were verified by measurements. Optimal design of nine ferrite bars geometry is proposed for use in wireless power transfer because of low consumption of ferrite material.Ferrite bars geometry was also used as a magnetic shield to reduce magnetic fields which may interfere with the electronics nearby. Magnetic flux density in ferrite bars is low enough that prevents ferrite bars from the saturation. The angular alignment of optimal design of nine ferrite bars on the transmitter and receiver side was negligible as the difference in the coupling coefficient was 0.13%. Advantages of using optimal design of nine ferrite bars geometry are: high value of the coupling coefficient, low consumption of ferrite material, and reduced weight.

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Coupling coefficient calculation method of circular coil with bilateral finite magnetic shields at horizontal misalignment in wireless power transfer systems

Chen,

Li,

Lyu

et al. 2024

Circuit Theory & Apps

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The coupling coefficient determines the transfer efficiency of the wireless power transfer (WPT) system. The magnetic leakage can be reduced, and the coupling coefficient of the coil can be enhanced by adding a magnetic shield. Thus, the transfer efficiency of the WPT system can be improved. However, when the receiving coil is added with magnetic shield and occurs horizontally misaligned, the coupling coefficients between the coils with the magnetic shield can only be calculated by finite element simulation, and there is no calculation method for the coupling coefficient of two circular coils with bilateral finite magnetic shield at horizontal misalignment. Therefore, based on Maxwell's equations and Bessel's function, the formula of the coupling coefficient between circular coils at coaxial is derived by the subdomain hierarchical analysis (SHA) method. On this basis, the coupling coefficient calculation formula between circular coils at horizontal misalignment is further derived by using the boundary vector equivalence (BVE) method. The results show that the maximum experimental error is not more than 5.58%, and the longest average time of the algorithm is not more than 1.282 s, which verifies the effectiveness and rapidity of the proposed method.

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Analysis of the Mutual Inductance of Planar-Lumped Inductive Power Transfer Systems

Cited by 144 publications

References 37 publications

Precise Analysis on Mutual Inductance Variation in Dynamic Wireless Charging of Electric Vehicle

Precise Analysis on Mutual Inductance Variation in Dynamic Wireless Charging of Electric Vehicle

Optimization, design, and modeling of ferrite core geometry for inductive wireless power transfer

Coupling coefficient calculation method of circular coil with bilateral finite magnetic shields at horizontal misalignment in wireless power transfer systems

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