Wired and wireless charging of electric vehicles: A system approach

Lempidis, Georgios; Zhang, Yichuan; Jung, Marco; Marklein, Rene; Sotiriou, Sotirios; Ma, Yanqi

doi:10.1109/edpc.2014.6984421

Cited by 13 publications

(15 citation statements)

References 8 publications

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“…This section presents an ANSYS ® Maxwell 3D finite element modeling and design of the circular model, rectangular model and the proposed optimal flux-pipe resonant coil design. For modeling design and analysis proposed in this research work, appropriate initial and boundary conditions were selected, model designs from the authors of [4,19] were replicated and simulated, and the results obtained were compared against their experimental results. The resulting comparisons were accurate to within ±6% error, which was deemed to be within an acceptable tolerance for all the research models replicated.…”

Section: Optimal Finite Element Modeling Of Flux-pipe Resonant Coil Tmentioning

confidence: 99%

“…The application of this technology to the charging of electric vehicles (EVs) provides a viable alternative to the charging of EVs using cable connection between the EV and the electric grid [2,3]. The wireless mode of charging the EV offers the advantage of eliminating the hazards of open contacts and hanging cables while providing galvanic isolation and at the same time providing safe, automatic and reliable charging of EVs [4]. WPT technologies can be classified into three main groups: electromagnetic radiation based, inductive coupling-based and magnetic resonant coupling-based WPT [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Modeling and Analysis of High Power, Low-loss Flux-Pipe Resonant Coils for Static Bidirectional Wireless Power Transfer

2019

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This paper presents the optimal modeling and finite element analysis of strong-coupled, high-power and low-loss flux-pipe resonant coils for bidirectional wireless power transfer (WPT), applicable to electric vehicles (EVs) using series-series compensation topology. The initial design involves the modeling of strong-coupled flux-pipe coils with a fixed number of wire-turns. The ohmic and core loss reduction for the optimized coil model was implemented by creating two separate coils that are electrically parallel but magnetically coupled in order to achieve maximum flux linkage between the secondary and primary coils. Reduction in the magnitude of eddy current losses was realized by design modification of the ferrite core geometry and optimized selection of shielding material. The ferrite core geometry was modified to create a C-shape that enabled the boosting and linkage of useful magnetic flux. In addition, an alternative copper shielding methodology was selected with the advantage of having fewer eddy current power losses per unit mass when compared with aluminum of the same physical dimension. From the simulation results obtained, the proposed flux-pipe model offers higher coil-to-coil efficiency and a significant increase in power level when compared with equivalent circular, rectangular and traditional flux-pipe models over a range of load resistance. The proposed model design is capable of transferring over 11 kW of power across an airgap of 200 mm with a coil-to-coil efficiency of over 99% at a load resistance of 60 Ω.

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Section: Optimal Finite Element Modeling Of Flux-pipe Resonant Coil Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling and Analysis of High Power, Low-loss Flux-Pipe Resonant Coils for Static Bidirectional Wireless Power Transfer

2019

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“…With the coil diameter (D) greater than four times the length of the airgap, a PTE of close to 90% can be achieved. According to the work of [5], and with consideration to safety regulations, the range of airgap for most electric vehicles varies from 11cm to 20 cm. Using the maximum airgap of 20 cm, in order to achieve a PTE between 80% and 90%, a resonant coil of diameter ranging from 40 cm to 80 cm will be required.…”

Section: Proposed Coil Specification and Designmentioning

confidence: 99%

“…To verify the accuracy of the proposed model design, the design environment, physical modelling and boundary condition were modelled after the design template of [5], [6] within ±6% error.…”

Section: Introductionmentioning

confidence: 99%

Optimal Finite Element Modelling and 3-D Parametric Analysis of Strong Coupled Resonant Coils for Bidirectional Wireless Power Transfer

Olukotun

Partridge

Bucknall

2018

2018 53rd International Universities Power Engineering Conference (UPEC)

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Resonant coils can be utilised for the wireless transfer of power between a supply grid and an electric vehicle. In order to achieve an affordable and optimal resonant coil design, the coupling factor becomes a significant parameter. The coupling factor (k) indicates the percentage of the total magnetic flux responsible for the transfer of electrical power from the transmitter to the receiver. A higher value of k will increase the magnitude of real power transferred between coils as well as reduce in the proportion of reactive power circulating in the system. For optimal and efficient bidirectional Wireless Power Transfer (WPT) operation, the primary and secondary coils must be designed to achieve a high Quality factor (Q) and high coupling factor. Using the same length of copper wire and volume of ferrite core, three simple resonant coils using finite element modelling (FEM) designs are proposed: circular, rectangular and doublesided winding coils. The physical length (D) of the coils is restricted to be no more than 600 mm due to the physical diameter of most electric cars as well as regulations governing electromagnetic radiations. Magnetostatic performance analyses of the coil designs to confirm mutual inductances, coupling factors, the maximum magnetic flux density (B) distributions and maximum saturation current tolerances for the magnetic core over an airgap of 150 mm were carried out. Likewise, parametric performance evaluations of the different resonant coil designs in three-dimensional space comprising of airgap variation, longitudinal and lateral misalignment were undertaken. From the FEA and Parametric performance results, the model of an optimal design was evaluated through simulation and was found to achieve a strong magnetic coupling factor of more than 0.5 across an airgap of 170 mm.

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“…Wireless charging technology is attracting attention for charging the batteries of electric vehicles (EVs). Inductive power transfer (IPT) is one of the most commonly used technologies to perform wireless charging [1][2][3][4][5][6][7][8][9][10]. A typical IPT system is composed of a transmitter coil and receiver coil which enables electric power transfer by alternating magnetic field.…”

Section: Introductionmentioning

confidence: 99%

A Double Helix Flux Pipe-Based Inductive Link for Wireless Charging of Electric Vehicles

Hwang

Kim

2020

WEVJ

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This paper presents a novel inductive link for wireless power transfer (WPT) system of electric vehicles (EVs). The WPT technology uses an alternating magnetic field to transfer electric power through space. The use of the WPT technology for charging electric vehicle provides an excellent alternative to the existing plug-in charging technology. It has been reported that the inductive link using planar coils such as the circular and rectangular coil are capable of transferring a high power with high efficiency. However, they have a poor tolerance for lateral misalignment, thus their power transfer efficiency decreases significantly with the misalignment. Due to the poor misalignment performance of the planar coil topology, extensive studies have been carried out on the flux pipe topology due to their excellent misalignment tolerance. To address this, in this paper, a novel inductive link using double helix flux pipe topology is proposed. The performances of the inductive link using the proposed double helix flux pipe are analyzed and compared with inductive links using conventional flux pipe. The proposed model has excellent characteristics in terms of the power transfer efficiency and tolerance against misalignments. The proposed model is capable of transferring over 1.6 kW of power with a coil-to-coil efficiency of over 98.5% at a load resistance of 20 Ω.

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Wired and wireless charging of electric vehicles: A system approach

Cited by 13 publications

References 8 publications

Finite Element Modeling and Analysis of High Power, Low-loss Flux-Pipe Resonant Coils for Static Bidirectional Wireless Power Transfer

Finite Element Modeling and Analysis of High Power, Low-loss Flux-Pipe Resonant Coils for Static Bidirectional Wireless Power Transfer

Optimal Finite Element Modelling and 3-D Parametric Analysis of Strong Coupled Resonant Coils for Bidirectional Wireless Power Transfer

A Double Helix Flux Pipe-Based Inductive Link for Wireless Charging of Electric Vehicles

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