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Energies
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Modelling of Wireless Power Transfer II
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Modelling of Wireless Power Transfer II

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 9214

Special Issue Editors

Prof. Dr. Mauro Mongiardo

E-Mail Website
Guest Editor
Department of Electronic and Information, University of Perugia, EngineeringVia G. Duranti, 93Perugia 06125, Italy
Interests: microwave; antennas; guided waves; CAD; wireless power transfer
Special Issues, Collections and Topics in MDPI journals
Dr. Ben Minnaert

E-Mail Website
Guest Editor
Applied Sciences, Odisee University College, KU Leuven Association, Gebroeders De Smetstraat 1, 9000 Gent, Belgium
Interests: wireless power transfer; energy harvesting; energy efficiency; embedded systems; wireless sensor networks and IoT-applications
Special Issues, Collections and Topics in MDPI journals
Dr. Giuseppina Monti

E-Mail Website
Guest Editor
Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy
Interests: focuses on the design of devices for wireless power transfer and energy harvesting
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Different methods exist to transfer energy wirelessly. One could use electromagnetic waves such as light or microwave radiation, quasi-static (magnetic and/or electric) fields, or even pressure or sound waves to transfer energy from a source to a load. Sometimes, multiple frequencies are applied to enhance the efficiency, or the wireless energy link is also used as information carrier.

Technically, any device that needs power can become an application for wireless power transfer (WPT). The current list of applications in which WPT is applied is therefore very diverse, from low-power portable electronics and household devices to high-power industrial automation and electric vehicles. With the rise of IoT sensor networks and industry 4.0, the presence of WPT will only increase.

In order to improve the current state of the art, models are being developed and tested experimentally. Such models represent either part of the WPT technology (e.g., the drivers, compensation schemes, the wireless link itself) or are focused on a certain application (e.g., transcutaneous energy transfer or electric vehicles). They allow simulating, quantifying, predicting, or visualizing certain aspects of the power transfer from transmitter(s) to receiver(s). Moreover, they often result in a better understanding of the fundamentals of the wireless link.

This Special Issue, entitled “Modelling of Wireless Power Transfer II” mainly covers original research related to the modelling of WPT, including academic and theoretical studies, as well as experimental work. It covers a broad range of models, from conceptual and graphical models to mathematical and numerical models. Potential topics include, but are not limited to, the following:

  • Near-field WPT;
  • Inductive coupling;
  • Capacitive coupling;
  • Far-field WPT;
  • Microwave/RF WPT;
  • Optical WPT
  • Multi-frequency wireless power transfer
  • Simultaneously wireless information and energy transfer (SWIFT)
  • Multiple transmitters and/or receivers;
  • Optimizing working conditions;
  • Energy-encrypted WPT systems
  • Frequency control;
  • Optimizing power transfer/efficiency/gains;
  • Components design;
  • Electronics design.
Prof. Dr. Mauro Mongiardo
Dr. Ben Minnaert
Dr. Giuseppina Monti
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • wireless power transfer
  • inductive power transfer
  • capacitive power transfer
  • microwave/RF wireless power transfer
  • optical wireless power transfer
  • SWIFT
  • magnetic resonance
  • modelling
  • simulations
  • electric vehicles
  • IoT
  • wireless sensor networks
  • electronics design
  • components design
  • energy harvesting
  • multi-frequency

Published Papers (5 papers)

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Research

18 pages, 10267 KiB  
Article
Performance Estimation: CCL WPT Topologies with Helical Coils
by Chien-Lung Chen and Chung-Wen Hung
Energies 2022, 15(14), 4944; https://doi.org/10.3390/en15144944 - 06 Jul 2022
Viewed by 1270
Abstract
The radius of the coil, the number of turns of the windings, and the parasitic resistances of energy-storing elements affect the performances of wireless power transfer systems. We aimed to study the effects of coil parameters on a wireless power transfer system with [...] Read more.
The radius of the coil, the number of turns of the windings, and the parasitic resistances of energy-storing elements affect the performances of wireless power transfer systems. We aimed to study the effects of coil parameters on a wireless power transfer system with the capacitor–capacitor–coupling coil (CCL)-based circuit using numerical simulations. The power transfer system topologies, including series–CCL (S–CCL), CCL–S, and CCL–CCL, were studied vis-à-vis coil parameters. The helical coil and the system topologies were modeled using MATLAB, and the performances of the topologies were examined in comparison to the series–series (S–S) topology. The variables used in the simulations included the radius and number of turns, the parasitic resistance that was merged in the impedance, and the reactance of energy-storing elements. Subsequently, the performances of the topologies were estimated by numerical simulations under several circumstances. The simulation results showed that the parasitic resistance of the coupling coil affects the performances of the topologies directly. The coupling coils with smaller geometries are beneficial to power transfer in the wireless power transfer system and may further contribute to miniaturization. Full article
(This article belongs to the Special Issue Modelling of Wireless Power Transfer II)
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30 pages, 4807 KiB  
Article
Spectral Element-Based Multi-Physical Modeling Framework for Axisymmetric Wireless Power Transfer Systems
by Koen Bastiaens, Dave C. J. Krop and Elena A. Lomonova
Energies 2022, 15(9), 3145; https://doi.org/10.3390/en15093145 - 25 Apr 2022
Viewed by 1263
Abstract
This paper concerns a multi-physical modeling framework based on the spectral element method (SEM) for axisymmetric wireless power transfer systems. The modeling framework consists of an electromagnetic and a thermal model. The electromagnetic model allows for eddy currents in source- and non-source regions [...] Read more.
This paper concerns a multi-physical modeling framework based on the spectral element method (SEM) for axisymmetric wireless power transfer systems. The modeling framework consists of an electromagnetic and a thermal model. The electromagnetic model allows for eddy currents in source- and non-source regions to be included in the analysis. The SEM is a numerical method, which is particularly advantageous in 2D problems for which the skin-depth is several orders of magnitude smaller compared to the object dimensions and complex geometrical shapes are absent. The SEM applies high-order trial functions to obtain the approximate solution to a boundary-value problem. To that end, the approximation is expressed as an interpolation at a set of nodal points, i.e., the nodal representation. The trial functions are Legendre polynomials, which reduces the complexity of the formulation. Furthermore, numerical integration is performed through Gaussian quadratures. In order to verify the SEM, a benchmark system is modeled using both the SEM and a finite element-based commercial software. The differences in the SEM solutions, i.e., magnetic vector potential and temperature distribution, and the discrepancies in essential post-processing quantities are assessed with respect to the finite element solutions. Additionally, the computational efforts of both methods are evaluated in terms of the sparsity, number of degrees of freedom, and non-zero elements. Full article
(This article belongs to the Special Issue Modelling of Wireless Power Transfer II)
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19 pages, 6418 KiB  
Article
Generalized Circuit Model of Shielded Capacitive Power Transfer
by Suziana Ahmad, Reiji Hattori and Aam Muharam
Energies 2021, 14(10), 2826; https://doi.org/10.3390/en14102826 - 14 May 2021
Cited by 7 | Viewed by 1819
Abstract
A capacitive power transfer (CPT) system wirelessly transfers energy between coupling plates and performance issues related to CPT systems are resonance conditions, matching impedance, voltage stress, and power loss. A generalized circuit model is proposed for shielded capacitive power transfer (S-CPT) using an [...] Read more.
A capacitive power transfer (CPT) system wirelessly transfers energy between coupling plates and performance issues related to CPT systems are resonance conditions, matching impedance, voltage stress, and power loss. A generalized circuit model is proposed for shielded capacitive power transfer (S-CPT) using an algebraic method. The proposed generalized S-CPT model is analyzed based on the symmetric and asymmetric configurations, and the relationship between the parameters of S-CPT is obtained with respect to the resonance condition, matching impedance, voltage stress, and efficiency. The best configuration of a symmetric S-CPT is recommended, and an asymmetric S-CPT is proposed based on the analysis results. Asymmetric-S-CPT hardware was constructed and demonstrated an operating frequency of 13.56 MHz. The hardware experimental result shows the validity and effectiveness of the proposed generalized model for designing S-CPT. Full article
(This article belongs to the Special Issue Modelling of Wireless Power Transfer II)
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16 pages, 5080 KiB  
Article
Minimum Power Input Control for Class-E Amplifier Using Depletion-Mode Gallium Nitride High Electron Mobility Transistor
by You-Chen Weng, Chih-Chiang Wu, Edward Yi Chang and Wei-Hua Chieng
Energies 2021, 14(8), 2302; https://doi.org/10.3390/en14082302 - 19 Apr 2021
Cited by 12 | Viewed by 2107
Abstract
In this study, we implemented a depletion (D)-mode gallium nitride high electron mobility transistor (GaN HEMT, which has the advantage of having no body diode) in a class-E amplifier. Instead of applying a zero voltage switching control, which requires high frequency sampling at [...] Read more.
In this study, we implemented a depletion (D)-mode gallium nitride high electron mobility transistor (GaN HEMT, which has the advantage of having no body diode) in a class-E amplifier. Instead of applying a zero voltage switching control, which requires high frequency sampling at a high voltage (>600 V), we developed an innovative control method called the minimum power input control. The output of this minimum power input control can be presented in simple empirical equations allowing the optimal power transfer efficiency for 6.78 MHz resonant wireless power transfer (WPT). In order to reduce the switching loss, a gate drive design for the D-mode GaN HEMT, which is highly influential for the reliability of the resonant WPT, was also produced and described here for circuit designers. Full article
(This article belongs to the Special Issue Modelling of Wireless Power Transfer II)
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25 pages, 852 KiB  
Article
Multiple Input Multiple Output Resonant Inductive WPT Link: Optimal Terminations for Efficiency Maximization
by Giuseppina Monti, Mauro Mongiardo, Ben Minnaert, Alessandra Costanzo and Luciano Tarricone
Energies 2021, 14(8), 2194; https://doi.org/10.3390/en14082194 - 14 Apr 2021
Cited by 5 | Viewed by 1792
Abstract
In this paper a general-purpose procedure for optimizing a resonant inductive wireless power transfer link adopting a multiple-input-multiple-output (MIMO) configuration is presented. The wireless link is described in a general–purpose way as a multi-port electrical network that can be the result of either [...] Read more.
In this paper a general-purpose procedure for optimizing a resonant inductive wireless power transfer link adopting a multiple-input-multiple-output (MIMO) configuration is presented. The wireless link is described in a general–purpose way as a multi-port electrical network that can be the result of either analytical calculations, full–wave simulations, or measurements. An eigenvalue problem is then derived to determine the link optimal impedance terminations for efficiency maximization. A step-by-step procedure is proposed to solve the eigenvalue problem using a computer algebra system, it provides the configuration of the link, optimal sources, and loads for maximizing the efficiency. The main advantage of the proposed approach is that it is general: it is valid for any strictly–passive multi–port network and is therefore applicable to any wireless power transfer (WPT) link. To validate the presented theory, an example of application is illustrated for a link using three transmitters and two receivers whose impedance matrix was derived from full-wave simulations. Full article
(This article belongs to the Special Issue Modelling of Wireless Power Transfer II)
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