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Applied Sciences
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Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies
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Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 11590

Special Issue Editors

Dr. Changsong Cai

E-Mail Website
Guest Editor
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
Interests: electromagnetic coupling; wireless power transfer; power electronics; renewable energy
Dr. Lei Zhao

E-Mail Website
Guest Editor
School of Automation, Chongqing University, Chongqing 400044, China
Interests: wireless power transfer; dynamic wireless charging; megahertz frequency wireless power transfer
Dr. Pengcheng Zhang

E-Mail Website
Guest Editor
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Interests: wireless power transfer; electromagnetic shielding; battery management
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Adrian Ioinovici

E-Mail Website
Guest Editor
1. “One Thousand Experts Plan”, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2. Faculty of Electric and Electronics Engineering, Holon Institute of Technology, Holon 5810201, Israel
Interests: energy conversion; power electronics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electromagnetic energy conversion and transfer have significantly improved the flexibility of electricity usage. Advanced electromagnetic energy conversion and wireless power transfer have become one of the focuses and interests in both research and industry. Despite the advantages and benefits, new challenges arise regarding its efficiency, parameter tolerance, transmission distance, costs, etc. We would like to invite you to submit original research and review articles to the Special Issue of Applied Science on the topics of "Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies". This Special Issue will include, but is not limited to, the following topics: 1. Electromagnetic energy harvesting; 2. Electromagnetic-based converters and circuits; 3. Signal detection; 4. Inductive/Capacitive power transfer; 5. Dynamic/Over-the-air wireless charging; 6. Multi-transmitter/Multi-receiver wireless power transfer system; 7. Simultaneous wireless power and data transfer; 8. Electromagnetic compatibility and biological effects; 9. Advanced electromagnetic materials; 10. Designs and applications of electromagnetic energy conversion and wireless power transfer.

Dr. Changsong Cai
Dr. Lei Zhao
Dr. Pengcheng Zhang
Prof. Dr. Adrian Ioinovici
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. Applied Sciences 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 2400 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

  • electromagnetic energy harvesting
  • electromagnetic-based converters and circuits
  • signal detection
  • inductive/capacitive power transfer
  • dynamic/over-the-air wireless charging
  • multi-transmitter/multi-receiver wireless power transfer system
  • simultaneous wireless power and data transfer
  • electromagnetic compatibility and biological effects
  • advanced electromagnetic materials
  • designs and applications of electromagnetic energy conversion and wireless power transfer

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Published Papers (5 papers)

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Research

24 pages, 9650 KiB  
Article
Implementation of an Accurate Measurement Method for the Spatial Distribution of the Electromagnetic Field in a WPT System
by Calin Petrascu, Adrian Tulbure and Vasile Topa
Appl. Sci. 2023, 13(9), 5773; https://doi.org/10.3390/app13095773 - 7 May 2023
Cited by 1 | Viewed by 1937
Abstract
In an inductive wireless power transfer (WPT) system, the transferred power depends on the coupling between the transmitter coil and the receiver coil and, consequently, on their spatial positioning with respect to each other. Since this positioning needs to be as flexible as [...] Read more.
In an inductive wireless power transfer (WPT) system, the transferred power depends on the coupling between the transmitter coil and the receiver coil and, consequently, on their spatial positioning with respect to each other. Since this positioning needs to be as flexible as possible, one can design various construction shapes for the coils, in terms of both winding geometry and core geometry. The system efficiency for different positionings and configurations can be assessed if the structure and distribution of the electromagnetic field (EMF) in the space close to the system are determined. In this context, this paper proposes an investigation method based on measuring the intensity of the electromagnetic field generated by the emitting coil in the WPT space in terms of both modulus and direction. The measurements needed to be performed at a sufficient number of points, so that the entire field was determined. The EMF value was estimated by linear spatial interpolation between the measured points. Moreover, this paper presents the method and the results of investigations carried out only in the presence of the emitting coil. Calibration or correction solutions were also proposed to obtain sufficient accuracy, and the viability of the method was therefore demonstrated. Full article
(This article belongs to the Special Issue Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies)
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13 pages, 6717 KiB  
Article
Design and Implementation of an IPT Charger with Minimum Number of Elements for Battery Charging Applications
by Xuebin Zhou, Shuai Shao, Yonghong Tan, Aiwu Chen, Zhitang Wang and Lin Yang
Appl. Sci. 2023, 13(6), 3580; https://doi.org/10.3390/app13063580 - 10 Mar 2023
Viewed by 1391
Abstract
Inductive power transfer (IPT) systems have been extensively studied and incorporated into various industrial applications. An IPT system with the capability to provide constant current output (CCO) and constant voltage output (CVO) is necessary to ensure optimal battery performance. However, the resistance of [...] Read more.
Inductive power transfer (IPT) systems have been extensively studied and incorporated into various industrial applications. An IPT system with the capability to provide constant current output (CCO) and constant voltage output (CVO) is necessary to ensure optimal battery performance. However, the resistance of the battery will continue to increase during the charging process, making it difficult for the system to realize load-independent CCO and CVO with zero phase angle (ZPA) operation. Therefore, this paper proposes an LC/S compensated IPT system, which can provide CCO and CVO at fixed frequencies. ZPA operation can be maintained in both CC and CV modes for low reactive power loss. Moreover, the total number of compensation elements of the system is minimized, with only one compensation capacitor on the receiving side, which ensures not only the low cost of the system but also a compact receiver. Finally, the correctness and feasibility of the proposed system are verified with simulations and experiments. Full article
(This article belongs to the Special Issue Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies)
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16 pages, 8887 KiB  
Article
FPGA-Based Frequency Tracking Strategy with High-Accuracy for Wireless Power Transmission Systems
by Xin Zhang, Zhiqi Chu, Yuehua Geng, Xuetong Pan, Rongmei Han and Ming Xue
Appl. Sci. 2023, 13(4), 2316; https://doi.org/10.3390/app13042316 - 10 Feb 2023
Cited by 1 | Viewed by 1741
Abstract
Aiming at the problem of the unavoidable phase-tracking error of the wireless power transfer (WPT) system caused by dead time, MOSFET drive and other factors, this paper proposes a frequency-tracking method with high accuracy based on a Field-Programmable Gate Array (FPGA) to track [...] Read more.
Aiming at the problem of the unavoidable phase-tracking error of the wireless power transfer (WPT) system caused by dead time, MOSFET drive and other factors, this paper proposes a frequency-tracking method with high accuracy based on a Field-Programmable Gate Array (FPGA) to track the current and voltage phase differences on the transmitting side. Compared with fixed-phase systems, the proposed method accurately controls the phase difference between voltage and current. It detects the phase difference in real time and adjusts the phase compensation angle dynamically to ensure that the system always operates under the optimal zero-voltage switching (ZVS) state, which reduces system loss. Experiments under operating conditions of varying transmission distances and load resistance values are carried out on a prototype. The experimental results show that the proposed method achieves a desired phase difference of 11.5° under the conditions of varying transmission distances and load resistance values, which meets the expectation of a phase difference between 10.5° and 13° to achieve ZVS. Within the range of over-coupling conditions, the output power and transmission efficiency of the WPT system are more significantly improved than those of the fixed-frequency system, which verifies the feasibility of the proposed method. Full article
(This article belongs to the Special Issue Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies)
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13 pages, 4875 KiB  
Article
M-ary Amplitude Shift Keying Power and Information Synchronous Transmission Based on Phase-Shifted Full-Bridge
by Xin Zhang, Xuetong Pan, Yuehua Geng, Zhiqi Chu, Rongmei Han and Ming Xue
Appl. Sci. 2023, 13(1), 475; https://doi.org/10.3390/app13010475 - 29 Dec 2022
Viewed by 2495
Abstract
This paper proposes an M-ary amplitude shift keying (MASK) power and information synchronous transmission system based on phase-shifted full-bridge (PSFB) for applications in wireless power transmission (WPT). The Pulse Width Modulation (PWM) waveform uses different phases to control the MOSFET in the [...] Read more.
This paper proposes an M-ary amplitude shift keying (MASK) power and information synchronous transmission system based on phase-shifted full-bridge (PSFB) for applications in wireless power transmission (WPT). The Pulse Width Modulation (PWM) waveform uses different phases to control the MOSFET in the full-bridge inverter for MASK modulation. The inverter voltage generates M amplitude transformation, forming a comprehensive power information flow. The demodulation circuit processes the information transmitted to the secondary side, following the power supply with a differential amplifier, to realize synchronous transmission of power supply and information. Compared with conventional amplitude modulation, the system’s volume is significantly reduced, and the DC-DC modulation circuit has no filtering effect. It transmits comprehensive high-level data and improves the information transmission rate from the perspective of bit width. In the experiment, 16-bit width data are transmitted, and the bit rate is increased by four times compared to conventional amplitude modulation. Combined with DSP, the designed demodulation circuit reduces the voltage amplitude fluctuation at the receiving end to 5% and minimizes the impact of amplitude modulation voltage fluctuation on the system. Full article
(This article belongs to the Special Issue Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies)
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19 pages, 5043 KiB  
Article
Helmholtz Coils Based WPT Coupling Analysis of Temporal Interference Electrical Stimulation System
by Chenyu Jiang, Panlong Gao, Xinsheng Yang, Dezheng Ji, Jialun Sun and Zhenghao Yang
Appl. Sci. 2022, 12(19), 9832; https://doi.org/10.3390/app12199832 - 29 Sep 2022
Cited by 1 | Viewed by 2931
Abstract
Electrical nerve stimulation (ENS) is clinically important in treating neurological diseases. This paper proposes a novel temporally interfering wireless power transfer (WPT) system, based on Helmholtz coils, to address energy depletion and the miniaturization of wireless power transfer systems for implantable devices. Compared [...] Read more.
Electrical nerve stimulation (ENS) is clinically important in treating neurological diseases. This paper proposes a novel temporally interfering wireless power transfer (WPT) system, based on Helmholtz coils, to address energy depletion and the miniaturization of wireless power transfer systems for implantable devices. Compared to conventional WPT systems, this paper uses Helmholtz coils with a centrosymmetric structure as the transmitting coils. A more uniform and stable magnetic field was obtained through structural improvements. It also improves the problem that changes in the receiving coil’s position affect the transmission power’s stability. Based on the principle of temporal interference (TI), two transmitting coils with a slight frequency difference generate a superposition of magnetic fields on the receiving coil and then induce a low-frequency electrical signal on it. The electrical stimulation system applies stimulation parameters of a specific intensity and frequency directly to the target nerve with electrodes connected to it. This eliminates the need for the conventional high-frequency signal to low-frequency signal processing circuitry and reduces the device’s size. In this paper, numerical calculations and an experimental verification of the proposed system are carried out. The magnetic field distribution and the receiving coil current waveform of the system were tested to verify the effectiveness and stability of the proposed design. The experimental results showed that the proposed wireless power transfer system can generate electrical signals of the desired waveform in the receiving coil. Its frequency of 10 Hz and amplitude of 42.4 mA meet the requirements for the electrical stimulation of the sciatic nerve. Full article
(This article belongs to the Special Issue Advanced Electromagnetic Energy Conversion and Wireless Power Transfer Technologies)
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