Study and analysis the effect of the Circular Flat Spiral Coil Structure on the performance of the Wireless Power Transfer System (original) (raw)
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An Efficient Design of Inductive Transmitter and Receiver Coils for Wireless Power Transmission
Electronics
Wireless power transmission (WPT) is commonly used today in many important daily applications, such as electric vehicles, mobile phones, and implanted medical devices. The transmitter and receiver coils are essential elements in the WPT system, and the coupling coefficient between these coils plays an important role in increasing the power transfer efficiency. In this work, we introduce a new approach to optimizing the coupling coefficient between the transmitter and the receiver coils by changing the geometries and locations of the coil turns. In the optimization process, the geometry of the turns varies from a rhombus to a circular and then a rectangular shape according to a quasi-elliptical parameter value. The Neuman formula is used to calculate the self-inductance, mutual inductance, and coupling coefficient for each specific geometry and turn location. The configuration with the highest coupling coefficient is then selected at the end of the optimization process. The final WPT...
Improved Transfer Efficiency of Wireless Power Transmission System featuring Coil-Size Disparity
Wireless power transmission (WPT) is a hot topic today. However, researches on magnetic coupling resonant WPT system are mostly conducted on the system with equal coil size of the transmitter and receiver. Practically, coil size different condition will certainly exist due to the space constraint on the target receiving device. Researches being done on different coil size system were often reported with degraded performance. This work uses an impedance based quality factor tuning technique to design the WPT system to work with the system with coil size disparity. A prototype has proven to transfer the power wirelessly over a distance up 15cm with a near constant efficiency of 73%. The introduced method shows improved efficiency and it is comparable to those equal coil size systems.
Analysis of Symmetric Two and Four-coil Magnetic Resonant Coupling Wireless Power Transfer
The Applied Computational Electromagnetics Society Journal (ACES)
This study examined the efficiency of power transfer for two-coil and four-coil spiral magnetic resonant coupling wireless power transfer (WPT) using distance to coil diameter (D/dm) ratio and reflection coefficient, S21 value. Adding resonators reduced the total resistance in the two-coil WPT system while increasing the S21 values of the whole system. A same-size spiral coil was proposed for the system and simulated using computer simulation technology (CST). A prototype with similar specifications for a four-coil design was implemented for verification. The proposed method yielded an optimal efficiency of 76.3% in the four-coil system, while the two-coil WPT yielded a 23.2% efficiency with a 1.33 D/dm ratio.
Investigation of correlation of design parameters in wireless power transfer system
IET Science, Measurement & Technology
Achieving higher power transfer efficiency with permissible output load power is a formidable challenge in designing a magnetically coupled resonant wireless power transfer system. Consequently, to instigate the power transfer characteristics, the theoretical models based on reflected load theory as well as lumped circuit models have been employed, which have been substantiated with the experimental measurements. It has been apprehended that maximum efficiency as well as the power delivered to the load can be enriched from the depreciated value through appropriate deliberation of coil's quality factor (coil design dependent) and coupling coefficient with acceptable operating frequency under different electric load conditions. The obtained results illuminate the correlation between the maximum power transfer ability and the quality factor of the coils, as well as the coupling coefficient, under different electric load conditions. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
In this paper, an analytical formula for the coupling coefficient (k) was introduced for two inductively coupled coils of ring configuration. The response surface methodology (RSM) was used as a tool to develop this formula. The k was tested as a function of the geometrical parameters which include the followings parameters: an air-gap (d) between inductively coupled coils; coils dimensions which include the inner (r1) and outer (r2) radii of the transmitter coil, inner (R1) and outer (R2) radii of the receiver coil; and misalignment parameters. Therefore, the introduced k formula is facilitating of a ring coil design, performance optimization of an IPT system, and prediction of system behaviour at normal or misalignment cases. The percentage effect of each parameter on the k was calculated. It was found that the d has the most considerable impact on the k among other geometrical parameters.
Analysis and optimisation of three‐coil wireless power transfer systems
IET Power Electronics, 2017
In this study, the analysis of a three-coil wireless power transfer (WPT) system, which can be divided into source, communication and load circuits, is discussed in details. Among the three-coil WPT systems features, it is demonstrated, for instance, that maximum efficiency (η MAX) and maximum power transferred to the load (P 3MAX) do not depend on the load resistance, neither on the mutual inductance between communication and load coils. In fact, it is shown that η MAX and P 3MAX depend only on source and communication circuits parameters. Practical results are also presented, showing good agreement with the developed theory and validating the proposed analysis.
In the inductive contactless battery charging, the power transfer capability and efficiency are mainly depending on the coupling coefficient (k) between the inductively coupled coils. In this work, the spiral and square coil configurations were experimentally made from litz wire as well as another spiral copper coil. This study investigates the frequency characteristics of these coil configurations in order to analyze the frequency characteristics of the self-inductance and equivalent series resistance of each coil; as well as we measured coefficient k under different conditions based on the air-gap variation between the inductively coupled coils and the misalignment between them. Furthermore, we examined the interoperability between the spiral and square coils configurations. It has been found that the litz spiral coil achieved slightly higher selfinductance with compare to litz square coil and spiral copper coil. Likewise, the square litz coil has slightly high equivalent series resistance with compare to other coils. On the other hand, the copper spiral coil has achieved better k than the other coupling interfaces of the litz wire coils.
U.P.B. Sci. Bull., Series C, 2019
In this paper, using response surface methodology, the analytical relationships as functional dependencies on the 7 specified geometrical parameters are established for self-inductances of an inductive power transfer (IPT) device. Using the variance analysis, the sensitivity of the self-inductance values to variations in the geometric parameters of the IPT device was studied. The established analytical relationships allow for easy determination of the selfinductance values specific to the IPT devices for their different geometric configurations, including for different misalignments. They are also particularly useful in optimal design of the IPT devices.
MATEC Web of Conferences, 2018
The objective of this paper is to investigate the impact of the spiral coil shape of inductive coupled power transfer on its performance. The coil shapes evaluated are: circular, square and pentagon spiral shapes. The coils are modelled in Ansoft Maxwell software. Simulations are carried out to determine the mutual inductance, coupling coefficient and magnetic flux density. The performance in term of magnetic flux density, mutual inductance and coupling coefficient of the three coils shapes are compared. Of the three shapes, the pentagon is shown to have the best performance in term of its mutual inductance, coupling coefficient and magnetic flux density.
500W Circular Coil Parameters Mathematical Design for Wireless Power Transfer with Ferrite Core
International Journal of Interactive Mobile Technologies (iJIM)
The efficiency of wireless pad designs with ferrite cores has been established in several investigations. However, they seldom offered a viable solution to the problem of modifying the ferrite form's geometric shape. The use of a ferrite core in the primary and secondary coils has been suggested by several researchers. The ferrite core design, on the other hand, is still in the works. Using the wrong ferrite core design might result in unnecessary extra weight and higher production costs. The circular coil design in the primary and secondary for wireless power transfer (WPT) in electric vehicles is studied in this research. The suggested coil design is used to develop mathematical design utilizing numerical solutions. Later, using Multisims software, this coil design is produced in simulation. The suggested coil design's power efficiency is examined and contrasted between computed and simulated results. Finally, based on the results of the power efficiency, a definitive disc...