Active Shielding Applied to an Electrified Road in a Dynamic Wireless Power Transfer (WPT) System

Cruciani, Silvano; Campi, Tommaso; Maradei, F.; Feliziani, M.

doi:10.3390/en13102522

Cited by 18 publications

(14 citation statements)

References 20 publications

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“…The behavior of the mutual inductance M = M(x) obtained by interpolation is shown in Figure 8. The coupling factor k = k(x) between GA and VA coil, calculated by (10), is shown in Figure 9. As observed, the variation of k is slightly higher than M due to the increase in GA coil self-inductance for larger GA coils.…”

Section: Applicationsmentioning

confidence: 99%

“…Moreover, advanced techniques to reduce the magnetic field in the environment were investigated [7]. In perspective, the idea is to create an electric infrastructure (i.e., electrified roads) where EVs can wirelessly recharge while Energies 2021, 14, 7790 2 of 14 moving along the roads and, hence, increasing their range significantly [8][9][10]. This type of WPT technology is known as dynamic wireless power transfer (DWPT).…”

Section: Introductionmentioning

confidence: 99%

“…Investigations of the short pad architecture can be found in [8] where a demonstration system is presented and tested while showing good performance. Additional insight on several aspects such as efficiency, EMF emission, etc., are presented in [9,10]. In all the available literature, the problem of the power discontinuity is evident, and the oscillation of power is still an open problem.…”

Section: Introductionmentioning

confidence: 99%

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Two-Coil Receiver for Electrical Vehicles in Dynamic Wireless Power Transfer

et al. 2021

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Dynamic wireless power transfer (DWPT) of electric vehicles (EVs) is the future of urban mobility. The DWPT is often based on a series of short track pads embedded in road pavement that wirelessly transfers electrical energy to EVs equipped with a pickup coil for battery charging. An open problem with this technology is the variation of the coupling factor as a vehicle switches from one transmitting coil to another during its motion. This can cause a significant change in power with possible power spikes and holes. In order to overcome these issues, a new architecture is here proposed based on two pick-up coils mounted in the vehicle underneath. These identical receiver coils are placed in different positions under the vehicle (one in front and the other in the rear) and are activated one at a time so that inductive coupling is always good enough. This innovative configuration has two main advantages: (i) it maintains a nearly constant coupling factor, as well as efficiency and transferred power, as the vehicle moves along the electrified road; (ii) it significantly reduces the cost of road infrastructure. An application is presented to verify the proposed two-coil architecture in comparison with the traditional one-coil. The results of the investigation show the significant improvement achieved in terms of maximum power variation which is nearly stable with the proposed two-coil architecture (only 2.8% variation) while there are many power holes with the traditional single coil architecture. In addition, the number of the required transmitting coils is significantly reduced due to a larger separation between adjacent coils.

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Section: Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-Coil Receiver for Electrical Vehicles in Dynamic Wireless Power Transfer

et al. 2021

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“…However, the area of the active shielding coil is relatively large, and the control is complicated. Moreover, the installation position and the shielding effectiveness of the active shielding coil have been limited [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Matrix Metamaterial Shielding Design for Wireless Power Transfer to Control the Magnetic Field

et al. 2022

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A wireless power transfer (WPT) system can bring convenience to human life, while a leakage magnetic field around the system can be harmful to humans or the environment. Due to application limitations of aluminum and ferrite materials, it is urgent to find a new type of shielding material. This paper first proposes a detailed model and analysis method of the matrix shielding metamaterial (MSM), which is applied to the low-frequency WPT system in an electric vehicle (EV). The MSM is placed on the top and side of the EV system to shield the magnetic field from all positions. To explore its function, a theoretical analysis of the MSM is proposed to prove the shielding performance. The simulation modeling and the design procedure of the MSM are introduced. Moreover, the prototype model of the WPT system with the MSM is established. The experimental results indicate that the magnetic field is controlled when the MSM is applied on the top or side of the EV-WPT system. The proposed MSM has been successfully proven to effectively shield the leakage magnetic field in the WPT system, which is suitable for the kHz range frequency.

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“…e suppression coil with excitation source produces the offset MF opposite to the original MF to clear or weaken the leakage MF [6,[15][16][17]. e shielding effect is obvious in a dynamic wireless charging system, but this method is unfavorable to the overall efficiency of the system, so it is necessary to design a suitable shielding scheme [18,19].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Shielding Techniques in the Wireless Power Transfer System for Charging Inspection Robot Application

Jiao

Yu-cheng

et al. 2021

International Journal of Antennas and Propagation

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Aiming at eliminating the leakage of magnetic fields from the wireless power transfer (WPT) system, the structural and working characteristics of the WPT system for the inspection robot are analyzed and an electromagnetic shielding method combining passive shielding and active shielding is proposed in this paper. Firstly, we simulated the magnetic field distribution of the WPT system in Maxwell. Secondly, passive shielding is configured in the WPT system, and the material, size, and position of the passive shielding are studied. Then, we add active shielding to areas where passive shielding cannot achieve a good shielding effect. Based on the analysis and summary of the two methods, we shield the WPT system in the horizontal direction with the appropriate size and distance of aluminum plate, and in the vertical direction, we use the active shielding coils. Simulation and experimental results show that the scheme only slightly reduces the transmission efficiency of the system (from 80.2% to 77.6%), but the shielding ability is 34.06% higher than that of only aluminum plates. The excellent effect of the proposed shielding method is verified in our experiment.

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Active Shielding Applied to an Electrified Road in a Dynamic Wireless Power Transfer (WPT) System

Cited by 18 publications

References 20 publications

Two-Coil Receiver for Electrical Vehicles in Dynamic Wireless Power Transfer

Two-Coil Receiver for Electrical Vehicles in Dynamic Wireless Power Transfer

Matrix Metamaterial Shielding Design for Wireless Power Transfer to Control the Magnetic Field

Electromagnetic Shielding Techniques in the Wireless Power Transfer System for Charging Inspection Robot Application

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