scholarly journals Examination of Reduction of Ferrite Core of Pickup Coil for Wireless Power Transfer for Railway Vehicles

2020 ◽  
Vol 28 (4) ◽  
pp. 276-281
Author(s):  
Keigo UKITA ◽  
Yasuaki SAKAMOTO ◽  
Takayuki KASHIWAGI ◽  
Keiichiro KONDO ◽  
Shinji WAKAO
Keyword(s):  
Wireless Power Transfer ◽  
Pickup Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Ferrite Core ◽  
Railway Vehicles

Pickup Coil Counter for Detecting the Presence of Trains Operated by Wireless Power Transfer

2017 ◽  
Vol 17 (22) ◽  
pp. 7526-7532 ◽  
Author(s):  
Karam Hwang ◽  
Dongwook Kim ◽  
Dongsoo Har ◽  
Seungyoung Ahn
Keyword(s):  
Wireless Power Transfer ◽  
Pickup Coil ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Central Bulge Ferrite Core for Efficient Wireless Power Transfer

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5111
Author(s):  
Huabo Xu ◽  
Huihui Song ◽  
Rui Hou
Keyword(s):  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Expansion Method ◽  
System Size ◽  
Mutual Inductance ◽  
Power Transfer ◽  
Wireless Power ◽  
Ferrite Core ◽  
Transmission Distance ◽  
Central Bulge

To improve the efficiency of the wireless power transfer (WPT) system without increasing the system size, a central bulge ferrite core with a novel configuration is proposed. The mutual inductance between magnetic coupling structures is able to increase obviously, which is approved by eigenfunction expansion method. In this paper, the mathematical models of the planar core and the central bulge core are established, respectively, as two types of the mutual inductance are calculated in same condition. The structure parameters of the central bulge ferrite core are further optimized by Maxwell magnetic field simulation. Experiments are conducted to compare the WPT efficiency of two types of ferrite cores in improving the efficiency of WPT system, in which the influence of transmission distance, lateral misalignment, and load variation are taken into account. The results show that central bulge ferrite core has better performance in WPT efficiency than the planar one, even in the case of long power transfer distance and lateral misalignment.

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

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7790
Author(s):  
Tommaso Campi ◽  
Silvano Cruciani ◽  
Francesca Maradei ◽  
Mauro Feliziani
Keyword(s):  
Wireless Power Transfer ◽  
Electrical Energy ◽  
Coupling Factor ◽  
Pickup Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Road Pavement ◽  
Single Coil ◽  
Electrical Vehicles ◽  
The Cost

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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