Optimized helix with ferrite core for wireless power transfer via resonance magnetic

2013 ◽  
Author(s):  
Olutola Jonah ◽  
Stavros V. Georgakopoulos
Keyword(s):  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Ferrite Core

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 Design and Analysis of Magnetic Coils for Optimizing the Coupling Coefficient in an Electric Vehicle Wireless Power Transfer System

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4143 ◽  
Author(s):  
Yang Yang ◽  
Jinlong Cui ◽  
Xin Cui
Keyword(s):  
Electric Vehicles ◽  
Coupling Coefficient ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Secondary Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Ferrite Core ◽  
Internal Parameters

Although the wireless power transfer (WPT) system for electric vehicles (EVs) provides numerous advantages, there is still a low coupling coefficient and the misalignment between the primary coil and the secondary coil needs to be solved. In this paper, the transmission efficiency and transmitted power were calculated based on Series-Series (SS) compensation topology. The coupling coefficient is related to the coil parameters and misalignments. A simulation study was carried out to explore the variation in the coupling coefficient for different coil configurations under different air gaps and coil misalignments. Moreover, the influence of the internal parameters of the square coil on the coupling coefficient was further studied. Finally, this paper discusses the influence of ferrite cores with a square coil on the coupling coefficient. The results of this paper show that designing the optimal internal parameters of the square coil and the ferrite core can increase the coupling coefficient between the coils, which can also provide guidelines for the design and optimization of the magnetic coupling coils for a wireless charging system for electric vehicles.

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

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3534 ◽  
Author(s):  
Babatunde Olukotun ◽  
Julius Partridge ◽  
Richard Bucknall
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
High Power ◽  
Wireless Power Transfer ◽  
Load Resistance ◽  
Power Transfer ◽  
Wireless Power ◽  
Ferrite Core ◽  
Low Loss ◽  
Pipe Model

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.

scholarly journals Wireless Power Transfer between Two Self-Resonant Coils over Medium Distance Supporting Optimal Impedance Matching Using Ferrite Core Transformers

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8540
Author(s):  
Jinwook Kim ◽  
Do-Hyeon Kim ◽  
Jieun Kim ◽  
Young-Jin Park
Keyword(s):  
Equivalent Circuit ◽  
Impedance Matching ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Q Factor ◽  
Power Transfer ◽  
Wireless Power ◽  
Ferrite Core ◽  
Matching Conditions ◽  
Power Transfer Efficiency

An efficient wireless power transfer (WPT) system is proposed using two self-resonant coils with a high-quality factor (Q-factor) over medium distance via an adaptive impedance matching network using ferrite core transformers. An equivalent circuit of the proposed WPT system is presented, and the system is analyzed based on circuit theory. The design and characterization methods for the transformer are also provided. Using the equivalent circuit, the appropriate relation between turn ratio and optimal impedance matching conditions for maximum power transfer efficiency is derived. The optimal impedance matching conditions for maximum power transfer efficiency according to distance are satisfied simply by changing the turn ratio of the transformers. The proposed WPT system maintains effective power transfer efficiency with little Q-factor degradation because of the ferrite core transformer. The proposed system is verified through experiments at 257 kHz. Two WPT systems with coupling efficiencies higher than 50% at 1 m are made. One uses transformers at both Tx and Rx; the other uses a transformer at Tx only while a low-loss coupling coil is applied at Rx. Using the system with transformers at both Tx and Rx, a wireless power transfer of 100 watts (100-watt light bulb) is achieved.

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