Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
2020, International Journal of Power Electronics and Drive Systems (IJPEDS)
Considering the massive development that took place in the past two decades, wireless power transfer has yet to show the applicability to be used due to several factors. This work focuses on determining the main parameters like, mutual inductance, and coupling coefficient for a pair of helical coils for wireless power transfer applications. These parameters are important in designing and analyzing a wireless power transfer system based on the phenomenon of inductive/ resonant inductive coupling. Here presents a simple approach based on fundamental laws of physics for determining the coupled coil parameters for single layered helical coils. The results conducted by computer simulation which is MATLAB. Furthermore, this analysis is used to study the effect of change in coil diameter, mutual inductance coefficient and change in distance between coils on parameters like self and mutual inductance of coupled coils which is of great importance in Wireless Power Transfer applications. The r...
Journal of Electrical Systems and Information Technology, 2024
Wireless power transfer (WPT) has garnered significant interest as a potentially transformative technology in the energy sector, as it presents a novel approach to powering and charging devices. The functionality of this technology is predicated upon the utilization of electromagnetic coupling to facilitate the wireless transmission of energy between two entities. Despite the considerable potential, wireless power transfer (WPT) faces significant obstacles that restrict its practical feasibility. One notable challenge that arises is the decrease in power transfer efficiency as the distance between the transmitter and receiver increases. Moreover, the wireless power transfer (WPT) technology is further limited by its reliance on accurate alignment between the transmitting source and the receiving device, thereby posing challenges for its practical implementation. The issues present substantial obstacles to the widespread commercialization of wireless power transfer (WPT). This study seeks to improve the efficacy of power transfer by optimizing the resonance frequency of the power transfer in response to the challenges. By systematically manipulating various parameters including coil dimensions, input voltage levels, and operational frequency, a novel approach is proposed to enhance the efficiency of power transfer. The study additionally offers valuable insights regarding the correlation between the distance separating the coils and the efficiency of power transfer. The findings of this study offer a thorough empirical analysis and are supported by a strong theoretical framework, resulting in a substantial coefficient of determination (R 2 = 0.937118). This finding suggests that the linear regression model under consideration could account for approximately 93.7118 percent of the variability observed in the distance. The findings of this study establish a pathway toward enhanced and feasible wireless power technology, thereby establishing a robust basis for the prospective commercial implementation of wireless power transfer (WPT) systems.
— Access to power is a fundamental requirement for the effective functioning of any electrical/electronic circuit. The conduit of transfer of power can be either physical (wires, cables etc.) of non-physical (i.e. wireless). Wireless power transfer is a broad term used to describe any means used to transmit power to electricity dependent systems and devices. In this paper, a wireless power transfer system is developed to provide an alternative to using power cords for electrical/electronic devices. With this technology, challenges like damaged or tangled power cords, sparking hazards and the extensive use of plastic and copper used in cord production are resolved and also the need for batteries in non-mobile devices is eliminated. In this system, electromagnetic energy is transmitted from a power source (transmitter) to an electrical load (receiver) via resonant inductive coupling. The performance achieved is a good indication that power can still be transmitted over a medium range. In addition, possible ways of improving the efficiency of the system are discussed.
Journal of Electromagnetic Engineering and Science
Self- and mutual inductances are major design parameters for wireless power transfer (WPT) systems. To optimize a WPT system and estimate its performance in terms of received power and efficiency, it is essential to obtain a simple, fast, and accurate calculation of these two parameters. The polarized double-D (DD) coils were selected due to their simplicity of structure, high efficiency, and low sensitivity to misalignment conditions. This paper presents analytical calculations of self- and mutual inductance using the Biot-Savart law for DD coils. The results of the analytical calculations of mutual inductance in different distances between coils were investigated, and the results of the calculations were verified using experimental and finite element method (FEM) simulation results. This paper also presents analytical and FEM-based optimization guidelines for the coupling coefficient of the transmitter coil.
2017
Access to power is a fundamental requirement for the effective functioning of any electrical/electronic circuit. The conduit of transfer of power can be either physical (wires, cables etc.) of non-physical (i.e. wireless). Wireless power transfer is a broad term used to describe any means used to transmit power to electricity dependent systems and devices. In this paper, a wireless power transfer system is developed to provide an alternative to using power cords for electrical/electronic devices. With this technology, challenges like damaged or tangled power cords, sparking hazards and the extensive use of plastic and copper used in cord production are resolved and also the need for batteries in non-mobile devices is eliminated. In this system, electromagnetic energy is transmitted from a power source (transmitter) to an electrical load (receiver) via resonant inductive coupling. The performance achieved is a good indication that power can still be transmitted over a medium range. I...
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.
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...
Wireless Power Transfer (WPT) has been drawing a lot of attention in the last ten years parallel with the market increase in electric vehicles. Although conductive charging methods are still the preferred ones, WPT-based charging systems are used as clean and flexible alternatives. At the center of these systems are the transmitting and receiving coils, and different coil types have been proposed in the literature. This study proposes a square-hexagonal hybrid coil structure to increase magnetic coupling by shaping the magnetic field. In addition, this design aims to minimize the coupling coefficient variation for misaligned coils which is one of the most significant problems in WPT systems. A 3D model of the coils was created and analyzed using ANSYS, Maxwell software. Compared to the conventional square coil structure the coupling coefficient of the proposed structure is less affected by misalignment on the x and y axes, and as a result, it has a better efficiency. In addition, a WPT system operating at 50 W, 85-kHz is designed and tested in a laboratory environment. The FEA analyses and experimental application results largely overlap, and accordingly, the coil-to-coil efficiency of our WPT system was 93.5% and the overall efficiency of the system was 87%.
2018
This paper proposes an inductive coupled wireless power transfer system that analyses the relationship between induced voltage and distance of resonating inductance in a printed circuit spiral coils. The resonant frequency produced by the circuit model of the proposed receiving and transmitting coils are analyzed by simulation and laboratory experiment. The outcome of the two results is compared to verify the validity of the proposed inductive coupling system. Experimental measurements are consistent with simulations over a range of frequencies spanning the resonance.
Today we live in a fast changing world. In present modern era power is very important role in our live system. The purpose of this paper practically implement concept of power transmission without wire. Using inductive coupling concept an alternating current in transmitter coil generates a magnetic field which induces a voltage in the receiver coil. This voltage can we used to power a mobile device or charge a battery etc. We have also discussed the emerging technical developments in wireless power transmission. This paper briefly represents the practical results on different applications basically wireless mobile charger, LED Lighting and DC fan.
3C Tecnología_Glosas de innovación aplicadas a la pyme, 2020
The concept of transferring electrical power to a load wirelessly is an intimidating and a challenging idea. The genius of powering systems wirelessly has pulled the curtains to a new world. In the 19 th century, Nikola developed 'Tesla Tower' in hope to transfer power wirelessly. Since then, the world is trying hard to say goodbye to wires. WPT using Inductive Coupling which falls under the domain of NFWPT, uses a transmitter coil to transmit power 109
— Recent research in wireless power transfer (WPT) using resonant inductive coupling has demonstrated very high efficiencies (above 40%) at large distances compared to the antenna dimensions, which has exponentially increased the number of potential applications of WPT. Since resonant inductive coupling is a very multidisciplinary field, different approaches have been proposed to predict the behaviour of these systems from physical theory of resonators, reflected load theory and the circuit point of view. However, the relation between these methods is still obscure. In this article, we compare the results of these models to find the efficiency of a Resonant Inductive Coupling WPT system under Steady-State sonditions and to analyze the relation between the optimal load values obtained from this perspectives and the ones obtained using impedance matching techniques.
2021
Wireless power transfer system has a major concern for several decades since various benefits have been included against wired counterpart. In this context, coupling structure has been investigated for various coils having different shapes of both magnetic cores and windings. This investigation is implemented based on a mathematical and modeling analysis to calculate inductive values of charging setups. This paper provides an accurate evaluation of inductive characteristics for the proposed coreless helical and spiral coils. The evaluation considers the dependence of inductive parameters on distance, geometry, and misalignment of coupling coils. In addition, the evaluation method is verified by the COMSOL software. Moreover, an accurate approximation of required inductive parameters is provided for the design of wireless charging system. Furthermore, four ferrite cores are provided for both winding types; and their coupling coefficients are examined to show the best configuration. R...
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.
TELKOMNIKA Telecommunication Computing Electronics and Control, 2018
Wireless electrical energy transfer has many advantages over the same through conducting cables. This research focusses on developing wireless power transfer circuit using inductive coupling. The experiment has been done by changing the numb er of turns and the diameter of the wire of a coil with the aim of finding the maximum power and the longest distance that the energy can be transferred through wireless means. The power source is connected to a series of electronics components and a copper coil which form the primary source for the transmitter the power receiver consists of a copper coil, a rectifier and the load. In a system with the diameter of the wires of the two coils is0.5 mm, and the number of turns is 26 at the frequency of 470KHz the efficiency of power transfer about 1.51% at a distance of 1 cm. The transferred energy by wireless means could operate a 1 Watt LED at 1 cm.
Tehnicki vjesnik - Technical Gazette, 2018
In this paper, parameter analysis of the inductive coils is evaluated for low power Wireless Power Transfer (WPT) applications. Inductive coils are the major element used in the WPT systems, in which different shaped coils are employed. The selection of coils is very critical, depends purely on the fundamental characteristics (shape and geometry) of the coils. In order to design a better system, three different shapes of coils, namely, circular, square and rectangular are designed and analysed. The vital parameters such as self-inductance, mutual inductance, quality factor, magnetic field and efficiency are evaluated for all three coils. It is observed that these parameters are maximal for circular as compared to the other two shapes. The circular coils produce higher voltage efficiency of 29% as compared to rectangular (25%) and square (23%) shaped coils. Thus, this paves a way to other researchers to suitably select circular inductive coils for wireless electricity applications.
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.
Telephone +46 (0)31 772 1000 Cover: Magnetic field lines between the primary and secondary coil in a wireless energy transfer system simulated in COMSOL.
Tremendous progress has been achieved in the field of wireless power transfer in last few years. Several methodologies have been adopted to transfer power across large air gaps with high efficiency. We demonstrated here nonradiative magnetic coupling to improve the transfer distance for wireless power transfer system where grid connection is inconvenient and hazardous. How much energy is being transferred is determined by the coupling coefficient and mutual inductance between the coils. Our purpose is to transfer maximum power at midrange distance based on magnetic resonant coupling technique. Here maximum efficiency found only at the point where source frequency and resonance frequency matched, is proposed by adaptive tuning method. In our analysis we observed that double peak appears in the output power as coupling coefficient increases. In our proposed system, we get 63% efficiency for 50 cm transfer distance, and then efficiency decreases gradually as the distance is increased.
2018
The main aim of this paper is to give a overview of recent researches and development in the field of wireless power transmission. The methods applied for wireless power transmission like Induction, Electromagnetic transmission, Electrodynamic induction, Radio, Microwave and Electrostatic Induction. This paper focuses on the latest technologies, merits and demerits in this field. Day by day new technologies are making our life simpler. Wireless power transmission could be one of the next technologies that bring the future nearer. In this paper, it has been discussed that it is possible to charge low power devices wirelessly via inductive coupling. It minimizes the complexity that arises for the use of conventional wire system. In addition, the paper also opens up new possibilities of wireless systems in our other daily life uses.
2015
The main objective of this paper is to develop a concept of transferring power without use of any wires. The concept is based on low frequency to high frequency conversion. High frequency power is transmitted between inductor through air core. By using two self resonating coils, non-radiative power is transmitted over distances upto three times the radius of the inductor coils.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.