Relay effects in multiple-node Resonant Inductive Coupling Wireless Power Transfer systems

Bou, Elisenda; Sedwick, Raymond J.; Alarcón, Eduard

doi:10.1109/iscas.2015.7168727

Cited by 3 publications

(5 citation statements)

References 2 publications

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“…Although an approximation, it is suitable for providing an accurate description of resonant, near-field WPT systems and is particularly useful for providing a general, theoretical framework [16]. It is noted that under steady-state, resonant conditions, it is equivalent to Circuit Theory (CT) [17]. Indeed, CT is needed to provide the physical context that is necessary for a CMT formulation of near-field WPT.…”

Section: Theorymentioning

confidence: 99%

“…This was performed using the MATLAB imped function found in [22] (p. 1011), which uses 16-point Gauss-Legendre numerical integration to calculate the mutual impedance between two dipoles by specifying their length and separation distance, with both quantities normalised with respect to the operating wavelength. In [17], it was shown that CMT is equivalent to CT under steady-state, resonant conditions and that it is possible to express the CMT equations in terms of CT variables. Using the analysis presented by both Bou [17] and Awai et al [23], it is possible to express the figure of merit of an arbitrarily-coupled system in terms of a mutual impedance Z m existing between a coupled transmitter and receiver and their equivalent loss resistances, R T and R R , respectively, as:…”

Section: Dipolesmentioning

confidence: 99%

“…In [17], it was shown that CMT is equivalent to CT under steady-state, resonant conditions and that it is possible to express the CMT equations in terms of CT variables. Using the analysis presented by both Bou [17] and Awai et al [23], it is possible to express the figure of merit of an arbitrarily-coupled system in terms of a mutual impedance Z m existing between a coupled transmitter and receiver and their equivalent loss resistances, R T and R R , respectively, as:…”

Section: Dipolesmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

2015

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The efficiency of a Wireless Power Transfer (WPT) system is greatly dependent on both the geometry and operating frequency of the transmitting and receiving structures. By using Coupled Mode Theory (CMT), the figure of merit is calculated for resonantly-coupled loop and dipole systems. An in-depth analysis of the figure of merit is performed with respect to the key geometric parameters of the loops and dipoles, along with the resonant frequency, in order to identify the key relationships leading to high-efficiency WPT. For systems consisting of two identical single-turn loops, it is shown that the choice of both the loop radius and resonant frequency are essential in achieving high-efficiency WPT. For the dipole geometries studied, it is shown that the choice of length is largely irrelevant and that as a result of their capacitive nature, low-MHz frequency dipoles are able to produce significantly higher figures of merit than those of the loops considered. The results of the figure of merit analysis are used to propose and subsequently compare two mid-range loop and dipole WPT systems of equal size and operating frequency, where it is shown that the dipole system is able to achieve higher efficiencies than the loop system of the distance range examined.

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Section: Theorymentioning

confidence: 99%

Section: Dipolesmentioning

confidence: 99%

Section: Dipolesmentioning

confidence: 99%

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Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

2015

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“…In this article, we propose a setup composed of two magnetically coupled coils that work in resonance, which are modeled and simulated using lumped circuit theory [7] and implemented in the Python language. The circuit, which was also physically built, resembles an AC transformer powered by a symmetric quadradic voltage source deployed out of a half-bridge circuit [8].…”

Section: Introductionmentioning

confidence: 99%

Complete cycle of modeling and simulation for wireless power transfer using circuit theory, simple electronics, and open-source software

Hage

2022

Eng. Res. Express

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This article presents a complete modeling and simulation framework for a simple resonant inductive coupling circuit, composed of a pair of inductive resonators that can wirelessly transfer about 60 W of power at a distance of approximately 15 cm. The circuit was physically implemented, and the transmitting coil was powered by a simple half-bridge electronic circuit that generated a square voltage signal. Measurements were compared to simulation results, and it was found that the proposed model could accurately explain and predict the behavior of the circuit. Our results show that optimum transfer of power varies according to the load values, the frequency and the distance between the transmitter and receiver, which can vary considerably depending on the application. Simulations using AC circuit analysis helped in depicting the behavior of the circuit under this kind of variability, and in characterizing the presence of the optimum points for power transfer, although these were attained at lower efficiency. The present analysis paves the way for further investigations using control theory to track the frequencies at which maximum power is delivered for each set of variables, i.e., the distance between the resonators and the load value.

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“…Transfer systems [100] • Unveiling nonlinear dynamics in resonant inductively coupled wireless power transfer [101] 8.5 Patents…”

Section: Publicationsmentioning

confidence: 99%

Wireless power transfer : fueling the dots

Bou Balust

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Resonant Inductive Coupling Wireless Power Transfer (RIC-WPT) has been proven to provide very high power transfer efficiencies (above 80%) for moderate distances, and is hence foreseen as a key technology to enable wireless power transfer to a myriad of different devices and related applications. Due to the multidisciplinary nature of the WPT underlying principles, several approaches have been provided to analyze RIC-WPT systems from different perspectives (encompassing Electromagnetic fields, Circuit models and Optics), but they have failed to provide a unified model to understand and ultimately to design the behaviour of such systems. This thesis is therefore aimed to, first, provide a multi-modal RIC-WPT complete model oriented to the design and in turn optimisation of RIC-WPT systems and, secondly, to explore and characterize the fundamental challenges precluding the widespread deployment of RIC-WPT and thereby accordingly to yield a set of design guidelines to overcome them. Finally, and due to the fact that multi-node RIC-WPT systems are key to the adoption of this technology, this thesis models, characterizes and analyzes Multiple-Input Multiple-Output RIC WPT Systems, making special emphasis on their scalability. La transferencia inalámbrica de potencia basada en acoplamiento resonante inductivo (RIC-WPT) ha demostrado ser capaz de proporcionar eficiencias muy altas en la transferencia de potencia (hasta 80%) a distancias moderadas, de modo que ésta se anticipa por tanto como una tecnología clave para posibilitar la transferencia inalámbrica de energía a una miríada de diferentes dispositivos y sus aplicaciones asociadas. Debido a la naturaleza multisciplinar de los principios que rigen los sistemas RICWPT, se han propuesto varias aproximaciones para analizar los sistemas RIC-WPT desde diferentes perspectivas (bien sean campos electromagnéticos, modelos circuitales, u óptica), pero no se ha conseguido proporcionar un modelo unificado que permita la comprensión y, en última instancia, el diseño del comportamiento y las prestaciones de estos sistemas. Esta tesis tiene por tanto como objeto, primero, proporcionar un modelo completo multi-modo de la tecnología RIC-WPT, orientado al diseño y a su vez la optimización de estos sistemas, y, como segundo foco, el explorar y caracterizar los retos fundamentales que todavía evitan un amplio despliegue de los sistemas RIC-WPT, ofreciendo en consonancia un conjunto de pautas de diseño para sobreponerlos. Finalmente, y debido al hecho de que los sistemas RIC-WPT con múltiples nodos son cruciales para la adopción de esta tecnología, en esta tesis doctoral se modelan, caracterizan y analizan los sistemas RIC-WPT de entrada y salida múltiple, con un especial énfasis en sus tendencias de escalabilidad.

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Relay effects in multiple-node Resonant Inductive Coupling Wireless Power Transfer systems

Cited by 3 publications

References 2 publications

Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

Complete cycle of modeling and simulation for wireless power transfer using circuit theory, simple electronics, and open-source software

Wireless power transfer : fueling the dots

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