Core Design and Optimization for Better Misalignment Tolerance and Higher Range of Wireless Charging of PHEV

Mohammad, Mostak; Choi, Seungdeog; Islam, Zahirul; Kwak, Sangshin; Baek, Jeihoon

doi:10.1109/tte.2017.2663662

Cited by 78 publications

(25 citation statements)

References 24 publications

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“…Currently, one has to connect an electric cable to the EV body for battery charging. Because such operation would include accidental risks and needs some physical labour, it is expected to be replaced with wireless power transfer (WPT) [1]- [9]. The WPT systems have following advantages: 1) power can be supplied without physical connection, 2) it is safe even in dirty and wet environments, 3) maintenance is easy.…”

Section: Introductionmentioning

confidence: 99%

“…In the present optimization, the core shape is optimized so that the coupling coefficient of the WPT device is maximized. Moreover, we have to design the robust WPT device against the misalignment between the transmitting and receiving coils because it is difficult to perfectly align the position of EVs to the transmitting coil [7]- [9]. Thus, we propose the robust optimization method for the WPT device considering misalignment between the transmitting and receiving coils.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

3-D topology optimization of magnetic cores for wireless power transfer with double-sided winding coils

Otomo

Igarashi

2019

JAE

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This paper presents three-dimensional topology optimization of magnetic cores for wireless power transfer with double-sided winding coils. In this optimization, the magnetic core shape is represented by the linear combination of the normalized Gaussian functions. The core shape is optimized so that the coupling coefficient between the transmitting and receiving coils is maximized. Moreover, robustness against misalignment between the coils is taken into account in the optimization. It is found that the optimized core shape effectively increases the net magnetic flux interlinked with the receiving coil, and outperforms the conventional core shapes.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3-D topology optimization of magnetic cores for wireless power transfer with double-sided winding coils

Otomo

Igarashi

2019

JAE

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show abstract

“…Recently, various studies have concentrated on coils and core geometries to increase the coupling coefficient (k) and the quality factor (Q) and to reduce the leakage magnetic flux in WPT systems regardless of core loss and core weight [7,8]. However, there are some studies describing the use of the optimal core thickness with core and coil shape to enhance system performance and misalignment tolerance [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Core Structure and Electromagnetic Field Evaluation in WPT Systems for Charging Electric Vehicles

Elnail

Huang

Xiao³

et al. 2018

Energies

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The electromagnetic field (EMF) in a wireless power transfer (WPT) system needs to couple inductively between the primary and the secondary coils through a large air gap, thus giving the system a loosely coupled characteristic. Therefore, magnetically permeable material must be employed to improve the coupling and reduce leakage magnetic flux. However, adding an iron core increases the weight and introduces core loss as a new factor. In this paper, a WPT system model using a lumped circuit model is introduced. Moreover, the relationship between the relative permeability and the coupling coefficient in addition to the core amount (core thickness) and core loss are discussed. Three cores structure named: pot, slotted, and shaped bars cores are investigated using finite element method (FEM) software. Inspired by the investigation results, a new core structure using optimum shaped bars is proposed, the EMF level for reducing core loss in high-power transfer systems and in order to mitigate the EMF exposure to humans is intensively evaluated. The proposed core succeeded in reducing EMF and core loss by about 44% and 30%, respectively. The FEM software and physical prototype were used to validate the proposed optimum core structure. Results showed that 3.5 kW power transferred through a 20 cm air gap with 96% system efficiency(coil-coil).

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“…High permeability materials, such as ferrite cores, can be used to enhance the magnetic coupling between coils, and hence the transmission efficiency is increased in long distance [17][18][19][20][21][22]. In [17], a novel configuration of a magnetic resonant structure is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the traditional system using air core, the transfer efficiency is increased by 42% with the proposed system. To improve the misalignment tolerance of the WPT system with ferrite core and minimize the core loss, the configuration of the ferrite cores is optimized in [21]. The flux density maintains uniform, and the core loss is reduced by 39% in the optimized ferrite core compared with the uniform thickness core.…”

Section: Introductionmentioning

confidence: 99%

Study of Load Characteristics in Wireless Power Transfer System With Ferrite Core

Wang¹,

Feng²,

Shen³

et al. 2018

PIER M

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For wireless power transfer via magnetic resonant coupling (MRC-WPT), magnetic coupling between resonant coils can be greatly enhanced when a ferrite core is introduced inside the coils. Based on the equivalent circuit model of wireless power transfer system, transfer characteristics of the MRC-WPT system with air resonant coils and with a ferrite core are respectively analyzed in this paper. The influence mechanism of the load on the power transfer efficiency is investigated. Also, the requirement of load for improving transfer efficiency is derived when adding the ferrite core to the system. The numerical simulation and experiment result indicate that the transmission efficiency in the MRC-WPT system with ferrite core is higher than that in the counterpart with air resonant coils in the whole transfer region when the load is larger than the maximal critical load. In addition, for different transfer distances, the system efficiency for the system using the ferrite core tends to become lower than that in the air coil system when the load is smaller than the critical load.

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Core Design and Optimization for Better Misalignment Tolerance and Higher Range of Wireless Charging of PHEV

Cited by 78 publications

References 24 publications

3-D topology optimization of magnetic cores for wireless power transfer with double-sided winding coils

3-D topology optimization of magnetic cores for wireless power transfer with double-sided winding coils

Core Structure and Electromagnetic Field Evaluation in WPT Systems for Charging Electric Vehicles

Study of Load Characteristics in Wireless Power Transfer System With Ferrite Core

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