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Applied Sciences
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Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications
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Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications

A special issue of Applied Sciences (ISSN 2076-3417).

Deadline for manuscript submissions: closed (1 February 2019) | Viewed by 16669

Special Issue Editors

Prof. Dr. Aiguo Patrick Hu

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Guest Editor
Electrical and Computer Engineering, The University of Auckland, Auckland 1023, New Zealand
Interests: wireless power transfer; power electronics; renewable energy
Special Issues, Collections and Topics in MDPI journals
Dr. Charles Van Neste

E-Mail Website
Guest Editor
Electrical and Computer Engineering Department, Tennessee Tech University, Cookeville, TN 38505, USA
Interests: wireless and quasi-wireless power transmission and communication; multi-level inverter control and design; renewable power generation; instrumentation; sensing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your research findings to a Special Issue of Applied Sciences on the subject area of wireless power transfer technologies. This Special Issue will reflect the most recent theoretical and practical developments of wireless power research for smart industrial, biomedical, and home applications. Topics to be covered in this Special Issue include, but are not limited to, the following:

  • Wireless power supply to distributed sensors and IoTs
  • Wireless power supply to robotics and automation systems
  • Wireless charging of AGVs (Automatic Guided Vehicles), materials handling and logistic systems
  • Wireless power supply of biomedical sensors and actuators, heart pumps
  • Wireless power supply in smart homes
  • Wireless charging of mobile phones, pads, smart watches
  • Static and dynamic EVs charging
  • Wireless power transfer mechanism
  • System modelling and power flow control
  • Soft switching converter topologies
  • Magnetic coupling design
  • Capacitive coupling design
  • New ferrites and dielectric materials
  • Ultrasonic transducers for wireless power transfer
  • Energy harvesting technologies
  • Wireless power for smart grids
  • Wireless energy network
  • Bi-directional wireless interface for PV and wind energy integration.

Prof. Dr. Aiguo Patrick Hu
Dr. Charles Van Neste
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

  • Wireless power transfer (WPT)
  • Contactless power transfer
  • Inductive power transfer (IPT)
  • Capacitive power transfer (CPT)
  • Ultrasonic power transfer (UPT)
  • Batteries
  • Supercapacitors
  • Wireless charging
  • Transcutaneous energy transfer (TET)
  • Energy harvesting
  • Wireless integration of renewable energy
  • Smart home
  • Smart grid

Published Papers (5 papers)

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Research

15 pages, 2780 KiB  
Article
Analytical Solution and Experimental Validation of the Electromagnetic Field in an IPT System
by Kehan Zhang, Xin Ren, Yuan Liu, Shuting Hui and Baowei Song
Appl. Sci. 2019, 9(7), 1323; https://doi.org/10.3390/app9071323 - 29 Mar 2019
Cited by 3 | Viewed by 2291
Abstract
This paper introduces the working principle of the inductive power transfer (IPT) system from the perspective of the electromagnetic field. Using Maxwell’s equations, the analytical solution for the electromagnetic field, synthesized by the primary and secondary circular coils in an IPT system, is [...] Read more.
This paper introduces the working principle of the inductive power transfer (IPT) system from the perspective of the electromagnetic field. Using Maxwell’s equations, the analytical solution for the electromagnetic field, synthesized by the primary and secondary circular coils in an IPT system, is deduced in detail to obtain the electric field in the IPT system, and the derivation process is easy to understand for researchers engaged in IPT. The final solutions are obtained by combining analytical derivation and the numerical integration method to find the induced voltage in the secondary coil. Finally, by comparison, the simulation results from the finite element software are in a good agreement with those from the analytical analysis. Moreover, an IPT system is set up to validate the analytical and simulation results, and the maximal relative error is under 6% in different working conditions, which shows that it is feasible to understand the working principle of IPT systems from the viewpoint of the electromagnetic field. Full article
(This article belongs to the Special Issue Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications)
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13 pages, 1630 KiB  
Article
Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants
by Krithikaa Mohanarangam, Yellappa Palagani and Jun Rim Choi
Appl. Sci. 2019, 9(6), 1125; https://doi.org/10.3390/app9061125 - 17 Mar 2019
Cited by 8 | Viewed by 3351
Abstract
This paper presents an optimized 3-coil inductive wireless power transfer (WPT) system at 13.56 MHz and 40.68 MHz to show and compare the specific absorption rate (SAR) effects on human tissue. This work also substantiates the effects of perfect alignment, lateral and/or angular [...] Read more.
This paper presents an optimized 3-coil inductive wireless power transfer (WPT) system at 13.56 MHz and 40.68 MHz to show and compare the specific absorption rate (SAR) effects on human tissue. This work also substantiates the effects of perfect alignment, lateral and/or angular misalignments on the power transfer efficiency (PTE) of the proposed WPT system. Additionally, the impacts of different tissue composition, input power and coil shape on the SAR are analyzed. The distance between the external and implantable coils is 10 mm. The results have been verified through simulations and measurements. The simulated results show that the SAR of the system at 40.68 MHz had crossed the limit designated by the Federal Communications Commission and hence, it is unsafe and causes tissue damage. Measurement results of the system in air medium show that the optimized printed circuit board coils at 13.56 MHz achieved a PTE of 41.7% whereas PTE waned to 18.2% and 15.4% at 10 mm of lateral misalignment and 60° of angular misalignment respectively. The PTE of a combination of 10 mm lateral misalignment and 60° angular misalignment is 21%. To analyze in a real-environment, a boneless pork sample with 10 mm of thickness is placed as a medium between the external and implantable coils. At perfect alignment, the PTE through pork sample is 30.8%. A RF power generator operating at 13.56 MHz provides 1 W input power to the external coil and the power delivered to load through the air and tissue mediums are 347 mW and 266 mW respectively. Full article
(This article belongs to the Special Issue Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications)
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13 pages, 4671 KiB  
Article
A Novel Approach to Reach Impedance Matching in Wireless Power Transfer Systems
by Xiong Tao, Cancan Rong, Conghui Lu, Xiutao Huang, Yingqin Zeng, Zhaoyang Hu and Minghai Liu
Appl. Sci. 2019, 9(5), 976; https://doi.org/10.3390/app9050976 - 07 Mar 2019
Cited by 3 | Viewed by 2695
Abstract
Wireless power transfer (WPT) using magnetic resonant coupling technology, came into focus promptly by virtue of its long transfer distance, and its non-radiative and high-efficiency power transfer. The impedance matching has been studied in the literature in recent years. However, there is no [...] Read more.
Wireless power transfer (WPT) using magnetic resonant coupling technology, came into focus promptly by virtue of its long transfer distance, and its non-radiative and high-efficiency power transfer. The impedance matching has been studied in the literature in recent years. However, there is no suitable way to reach the optimum load in reality. In this paper, a new method is proposed to maximize the power transfer ability of a given pair of coupled coils. An analytical calculation of the mutual inductance is presented accurately with respect to the angled concentric multiple-turn printed spiral coils (PSC). In addition, the experimental results were in good agreement with the circuit simulation. Finally, a WPT experiment setup working at 3MHz resonance was established. The experiment results verified that the maximum transfer efficiency at fixed distances can be easily achieved by adjusting the angle to reach impedance matching. Compared to prior to optimization, the maximum improved efficiency was improved by 11%. Full article
(This article belongs to the Special Issue Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications)
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14 pages, 4280 KiB  
Article
Analysis and Optimized Design of Metamaterials for Mid-Range Wireless Power Transfer Using a Class-E RF Power Amplifier
by Cancan Rong, Xiong Tao, Conghui Lu, Zhaoyang Hu, Xiutao Huang, Yingqin Zeng and Minghai Liu
Appl. Sci. 2019, 9(1), 26; https://doi.org/10.3390/app9010026 - 21 Dec 2018
Cited by 12 | Viewed by 3654
Abstract
In this paper, a mid-range wireless power transfer (WPT) system based on metamaterials (MMs) has been presented. It has been shown that the MMs are positioned in the WPT system to focalize the electromagnetic field for distance enhancement and efficiency improvement theoretically and [...] Read more.
In this paper, a mid-range wireless power transfer (WPT) system based on metamaterials (MMs) has been presented. It has been shown that the MMs are positioned in the WPT system to focalize the electromagnetic field for distance enhancement and efficiency improvement theoretically and experimentally. The MMs were fabricated by using a single layer printed-circuit board (PCB) with the negative magnetic permeability, μr. An applicable impedancetuning technology was implemented by changing the operating distance between the drive (load) resonator and the internal resonator, which can achieve the optimal load of the system. In addition, the Class-E RF (radio frequency) power amplifier is firstly proposed as the high frequency excitation source of the WPT system based on the MMs due to its simple design and high efficiency. The proposed technology can achieve efficiency improvements of 4.26% and 9.13% at distances of 100 cm and 200 cm around the 2.80 MHz WPT system with the MMs, respectively. Specially, it is worth mentioning that the system efficiency is enhanced by 18.58% at 160 cm. The measured results indicate the WPT system based on the MMs can assure a stable output power of 5W at a transfer distance of 200 cm. Full article
(This article belongs to the Special Issue Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications)
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16 pages, 10793 KiB  
Article
Capacitive Power Transfer System with Reduced Voltage Stress and Sensitivity
by Tarek M. Mostafa, Dai Bui, Aam Muharam, Reiji Hattori and Aiguo Patrick Hu
Appl. Sci. 2018, 8(7), 1131; https://doi.org/10.3390/app8071131 - 12 Jul 2018
Cited by 11 | Viewed by 3922
Abstract
This paper introduces a DC–DC buck converter on the secondary side of the capacitive power transfer system to reduce the voltage and electric field across the interface, and to reduce the circuit Q, and thus the system sensitivity. The system is mathematically [...] Read more.
This paper introduces a DC–DC buck converter on the secondary side of the capacitive power transfer system to reduce the voltage and electric field across the interface, and to reduce the circuit Q, and thus the system sensitivity. The system is mathematically analyzed to study the improvement in sensitivity and voltage stress. The leakage electric field emissions around the plates are investigated by simulation. The analytical and simulation results show that by reducing the duty cycle of the buck converter at a constant output power, the voltage across the plates can be significantly reduced and the circuit becomes less sensitive to the variations in parameters. Experimental results demonstrated that Q and the voltage stress over the capacitive interface are reduced by changing the duty cycle of the buck converter. For delivering 10 W of power, the maximum voltage stress across one pair of the coupling plates is reduced from 211 V in the conventional system without using a DC–DC converter, to 65 V and 44 V at duty cycles of 30% and 20%, respectively. The system achieves an end-to-end power efficiency of 80% at an output power of 10 W and a duty cycle of 30%. Full article
(This article belongs to the Special Issue Wireless Power Transfer for Smart Industrial, Biomedical and Home Applications)
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