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Intelligent Wireless Power Transfer System and Its Application
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Intelligent Wireless Power Transfer System and Its Application

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A1: Smart Grids and Microgrids".

Deadline for manuscript submissions: closed (31 January 2020) | Viewed by 57855

Special Issue Editors

Prof. Dr. Mauro Feliziani

E-Mail Website
Guest Editor
Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Interests: wireless power transfer (WPT); electromagnetic compatibility (EMC); electromagnetic field (EMF) safety; computational electromagnetics
Special Issues, Collections and Topics in MDPI journals
Dr. Tommaso Campi

E-Mail Website
Guest Editor
Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Interests: wireless power transfer; bioelectromagnetics; electromagnetic compatibility
Special Issues, Collections and Topics in MDPI journals
Dr. Silvano Cruciani

E-Mail
Guest Editor
Department of Industrial and Information Engineering and Economics, University of L’Aquila, L’Aquila, Italy
Interests: wireless power transfer; numerical methods; bioelectromagnetics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Wireless power transfer (WPT) technology will be widely used in the near future because it permits the transmission of electrical energy from a power source to an electrical load across an air gap without the use of any galvanic connection.  For this reason, it is safer, cheaper and more comfortable than traditional wired connections. The vision for the future of power supply is the gradual replacement of wire links with wireless connections, as was the case in communications a few years ago. WPT technology based on inductively coupled (resonant or non-resonant) coils is under investigation and development for a very wide range of applications in electric vehicles, drones, medical devices, consumer electronics, portable and mobile devices, sensors, IoT, etc. This Special Issue is focused on algorithms, models, methods, technologies and applications that permit an improvement on the reliability and performance of intelligent WPT systems for fixed and mobile applications.  Potential topics include, but are not limited to, software and hardware intelligent techniques for automatic alignment of coils and re-tuning, smart compensation, range adaptation, multicoil design and selection, soft switching, frequency selection, load matching, mitigation of Electromagnetic compatibility (EMC) and electromagnetic safety issues.

Prof. Mauro Feliziani
Dr. Tommaso Campi
Dr. Silvano Cruciani
Guest Editors

Manuscript Submission Information

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Keywords

  • wireless power transfer (WPT)
  • inductive power transfer
  • magnetic resonance
  • power electronics
  • battery charging
  • electric vehicle (EV)
  • static and dynamic EVs charging
  • electrified road
  • railway systems
  • aircraft, UAV and drones
  • transcutaneous energy transfer (TET)
  • biomedical devices
  • electromagnetic compatibility (EMC)
  • electromagnetic (EMF) safety
  • wireless charging of mobile phones, pads, smart watches
  • soft switching converter topologies
  • advanced and new materials
  • energy harvesting
  • smart home
  • smart city
  • smart grids
  • IoT

Published Papers (16 papers)

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Research

13 pages, 4656 KiB  
Article
Folded Spiral Resonator with Double-Layered Structure for Near-Field Wireless Power Transfer
by Takaya Arai and Hiroshi Hirayama
Energies 2020, 13(7), 1581; https://doi.org/10.3390/en13071581 - 01 Apr 2020
Cited by 7 | Viewed by 2401
Abstract
In this paper, a folded spiral resonator with a double-layered structure for near-field wireless power transfer is proposed. In near-field wireless power transfer, conjugate impedance matching is important to achieve high transfer efficiency. To achieve maximum available efficiency, it is common to connect [...] Read more.
In this paper, a folded spiral resonator with a double-layered structure for near-field wireless power transfer is proposed. In near-field wireless power transfer, conjugate impedance matching is important to achieve high transfer efficiency. To achieve maximum available efficiency, it is common to connect a matching circuit to the antenna. However, the loss increases if a matching circuit is used. A coupling inductor with a resonant capacitor has the capability to adjust an imaginary part of the input impedance, whereas the folded spiral resonator has the capability to adjust both the imaginary and real parts of the input impedance. This resonator can achieve the maximum available efficiency without a matching circuit. This paper shows that the folded spiral resonator with a double-layered structure realizes high transfer efficiency compared to conventional models. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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23 pages, 10585 KiB  
Article
Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors
by Ghada Bouattour, Mohamed Elhawy, Slim Naifar, Christian Viehweger, Houda Ben Jmaa Derbel and Olfa Kanoun
Energies 2020, 13(5), 1244; https://doi.org/10.3390/en13051244 - 07 Mar 2020
Cited by 18 | Viewed by 4255
Abstract
Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In this [...] Read more.
Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In this paper, a compact multiplexed primary side electronic circuit is proposed, which includes only one signal generator, a passive peak detector, a communication module, and a compensation capacitor. The novel approach has been studied and evaluated for a MISO-WPT system having a 16 coils on primary side and one coil on secondary side having the double diameter. Results show that a standard microcontroller, in this case an STM32, is sufficient for the control of the whole system, so that the costs and the energy consumption are significantly reduced. An activation strategy has been proposed, which allows to determine the optimal transmitting coil for each position of the receiving coil and to switch it on. The time-to-start-charging at different positions of the receiving coil and different number of neighbors has been determined. It remains in all cases under 2.5 s. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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22 pages, 14563 KiB  
Article
Magnetic Positioning Technique Integrated with Near-Field Communication for Wireless EV Charging
by Zhongnan Qian, Rui Yan, Zeqian Cheng, Jiande Wu and Xiangning He
Energies 2020, 13(5), 1081; https://doi.org/10.3390/en13051081 - 01 Mar 2020
Cited by 2 | Viewed by 2992
Abstract
For wireless electric vehicle charging, the relative position of the primary and secondary coils has significant impacts on the transferred power, efficiency and leakage magnetic flux. In this paper, a magnetic positioning method using simultaneous power and data transmission (SWPDT) is proposed for [...] Read more.
For wireless electric vehicle charging, the relative position of the primary and secondary coils has significant impacts on the transferred power, efficiency and leakage magnetic flux. In this paper, a magnetic positioning method using simultaneous power and data transmission (SWPDT) is proposed for power coil alignment. Four signal coils are installed on the primary coil to detect the secondary coil position. By measuring the positioning signal amplitudes from the four signal coils, the power coil relative position can be obtained. Moreover, all the communication needed in the positioning process can be satisfied well by SWPDT technology, and no extra radio frequency (RF) communication hardware is needed. The proposed positioning method can work properly both in power transfer online condition and in power transfer offline condition. Thus, a highly integrated wireless charging system is achieved, which features simultaneous power transfer, data transmission and position detection. A positioning experimental setup is built to verify the proposed method. The experimental results demonstrate that the positioning resolution can be maintained no lower than 1 cm in a 1060 mm × 900 mm elliptical region for a pair of 510 mm × 410 mm rectangular power coils. The three-dimensional positioning accuracy achieves up to 1 cm. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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17 pages, 9711 KiB  
Article
Design and Implementation of a Wireless Charging-Based Cardiac Monitoring System Focused on Temperature Reduction and Robust Power Transfer Efficiency
by Dongwook Kim, Dawon Jeong, Jongwook Kim, Haerim Kim, Junho Kim, Sung-Min Park and Seungyoung Ahn
Energies 2020, 13(4), 1008; https://doi.org/10.3390/en13041008 - 24 Feb 2020
Cited by 19 | Viewed by 4388
Abstract
Wireless power transfer systems are increasingly used as a means of charging implantable medical devices. However, the heat or thermal radiation from the wireless power transfer system can be harmful to biological tissue. In this research, we designed and implemented a wireless power [...] Read more.
Wireless power transfer systems are increasingly used as a means of charging implantable medical devices. However, the heat or thermal radiation from the wireless power transfer system can be harmful to biological tissue. In this research, we designed and implemented a wireless power transfer system-based implantable medical device with low thermal radiation, achieving 44.5% coil-to-coil efficiency. To suppress thermal radiation from the transmitting coil during charging, we minimized the ESR value of the transmitting coil. To increase power transfer efficiency, a ferrite film was applied on the receiving part. Based on analyses, we fabricated a cardiac monitoring system with dimensions of 17 × 24 × 8 mm3 and implanted it in a rat. We confirmed that the temperature of the wireless charging device increased by only 2 °C during the 70 min charging, which makes it safe enough to use as an implantable medical device charging system. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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10 pages, 2078 KiB  
Article
Sensitivity Analysis of an Implanted Antenna within Surrounding Biological Environment
by Shuoliang Ding and Lionel Pichon
Energies 2020, 13(4), 996; https://doi.org/10.3390/en13040996 - 23 Feb 2020
Cited by 6 | Viewed by 2758
Abstract
The paper describes the sensitivity analysis of a wireless power transfer link involving an implanted antenna within the surrounding biological environment. The approach combines a 3D electromagnetic modeling and a surrogate model (based polynomial chaos expansion). The analysis takes into account geometrical parameters [...] Read more.
The paper describes the sensitivity analysis of a wireless power transfer link involving an implanted antenna within the surrounding biological environment. The approach combines a 3D electromagnetic modeling and a surrogate model (based polynomial chaos expansion). The analysis takes into account geometrical parameters of the implanted antenna and physical properties of the biological tissue. It allows researchers to identify at low cost the main parameters affecting the efficiency of the transmission link. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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16 pages, 7277 KiB  
Article
A Wireless Power Transfer Based Implantable ECG Monitoring Device
by Junho Kim, Hyeok Kim, Dongwook Kim, Hun-Jun Park, Kiwon Ban, Seungyoung Ahn and Sung-Min Park
Energies 2020, 13(4), 905; https://doi.org/10.3390/en13040905 - 18 Feb 2020
Cited by 23 | Viewed by 5364
Abstract
Implantable medical devices (IMDs) enable patients to monitor their health anytime and receive treatment anywhere. However, due to the limited capacity of a battery, their functionalities are restricted, and the devices may not achieve their intended potential fully. The most promising way to [...] Read more.
Implantable medical devices (IMDs) enable patients to monitor their health anytime and receive treatment anywhere. However, due to the limited capacity of a battery, their functionalities are restricted, and the devices may not achieve their intended potential fully. The most promising way to solve this limited capacity problem is wireless power transfer (WPT) technology. In this study, a WPT based implantable electrocardiogram (ECG) monitoring device that continuously records ECG data has been proposed, and its effectiveness is verified through an animal experiment using a rat model. Our proposed device is designed to be of size 24 × 27 × 8 mm, and it is small enough to be implanted in the rat. The device transmits data continuously using a low power Bluetooth Low Energy (BLE) communication technology. To charge the battery wirelessly, transmitting (Tx) and receiving (Rx) antennas were designed and fabricated. The animal experiment results clearly showed that our WPT system enables the device to monitor the ECG of a heart in various conditions continuously, while transmitting all ECG data in real-time. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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18 pages, 12373 KiB  
Article
Wireless Power Hanger Pad for Portable Wireless Audio Device Power Charger Application
by Win-Jet Luo, C. Bambang Dwi Kuncoro and Yean-Der Kuan
Energies 2020, 13(2), 419; https://doi.org/10.3390/en13020419 - 15 Jan 2020
Cited by 3 | Viewed by 2547
Abstract
Since the portability feature has been introduced in headphone development, this device now uses a battery as the main built-in power. However, the battery has limited power capacity and a short lifetime. Battery substitution and a conventional battery charger method is an ineffective, [...] Read more.
Since the portability feature has been introduced in headphone development, this device now uses a battery as the main built-in power. However, the battery has limited power capacity and a short lifetime. Battery substitution and a conventional battery charger method is an ineffective, inflexible inconvenience for enhancing the user experience. This paper presents an innovative portable audio device battery built-in charger method based on wireless power technology. The developed charging device is composed of a headphone hanger pad for the wireless headphone and a charging pad for the portable wireless audio device battery charging. Circular flat spiral air-core coil was designed and evaluated using a numerical method to obtain optimal vertical magnetic field distribution based on the proposed evaluation criteria. A coil has inner coil diameter of 25 mm, outer coil diameter of 47.8 mm, wire diameter of 0.643 mm, the pitch of 0.03 mm and a number of turns of 17 was chosen to be implemented on the transmitter coil. A magnetic induction technique was adopted in the proposed wireless power transmission module which was implemented using commercial off-the-shelf components. For experimental and validation purposes, a developed receiver module applied to the commercial wireless headphone and portable audio speaker have a built-in battery capacity at 3.7 V 300 mAh. The experimental results show that the wireless power hanger pad prototype can transfer a 5 V induction voltage at a maximum current of 1000 mA, and the power transfer efficiency is around 70%. It works at 110 kHz of operation frequency with a maximum transmission distance of about 10 mm and takes 1 h to charge fully one 3.7 V 300 mAh polymer lithium battery. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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17 pages, 5796 KiB  
Article
Wireless Battery Charging Circuit Using Load Estimation without Wireless Communication
by Sang-Won Lee, Yoon-Geol Choi, Jung-Ha Kim and Bongkoo Kang
Energies 2019, 12(23), 4489; https://doi.org/10.3390/en12234489 - 25 Nov 2019
Cited by 4 | Viewed by 3081
Abstract
A wireless battery charging circuit is proposed, along with a new load estimation method. The proposed estimation method can predict the load resistance, mutual inductance, output voltage, and output current without any wireless communication between the transmitter and receiver sides. Unlike other estimation [...] Read more.
A wireless battery charging circuit is proposed, along with a new load estimation method. The proposed estimation method can predict the load resistance, mutual inductance, output voltage, and output current without any wireless communication between the transmitter and receiver sides. Unlike other estimation methods that sense the high-frequency AC voltage and current of the transmitter coil, the proposed method only requires the DC output value of the peak current detection circuit at the transmitter coil. The proposed wireless power transfer (WPT) circuit uses the estimated parameters, and accurately controls the output current and voltage by adjusting the switching phase difference of the transmitter side. The WPT prototype circuit using a new load estimation method was tested under various coil alignment and load conditions. Finally, the circuit was operated in a constant current and constant voltage modes to charge a 48-V battery pack. These results show that the proposed WPT circuit that uses the new load estimation method is well suited for charging a battery pack. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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20 pages, 22919 KiB  
Article
Single-Layer Transmitter Array Coil Pattern Evaluation toward a Uniform Vertical Magnetic Field Distribution
by Win-Jet Luo, C. Bambang Dwi Kuncoro, Pratikto and Yean-Der Kuan
Energies 2019, 12(21), 4157; https://doi.org/10.3390/en12214157 - 31 Oct 2019
Cited by 5 | Viewed by 4366
Abstract
A uniform magnetic field distribution is a critical aspect in the transmitter array coil design process for achieving a homogenous vertical magnetic field distribution. The free position and orientation features can thus be implemented in the wireless power charging system. This paper presents [...] Read more.
A uniform magnetic field distribution is a critical aspect in the transmitter array coil design process for achieving a homogenous vertical magnetic field distribution. The free position and orientation features can thus be implemented in the wireless power charging system. This paper presents vertical magnetic field distribution generated by a single-layer circular flat spiral air core transmitter array coil model analysis and evaluation using a numerical analysis method. This method is developed based on the off-symmetry axis magnetic field distribution due to a circular current loop derived from the Biot-Savart law. The proposed evaluation criteria are used to obtain the vertical magnetic field distribution characteristic of the evaluated array coil model. The vertical magnetic field distribution of several circular flat spiral air core coils, in both single and array coil models with different coil geometries were investigated to obtain the relation between the coil parameters and the distance between the adjoining coil centers to generate uniform vertical magnetic field distribution. A case study was also conducted to analyze and evaluate several array coil model patterns (1 × 2 array coil, 1 × 3 array coil, 2 × 2 array coil, 2 × 3 array coil) to meet uniform vertical magnetic field distribution. The array coil model is composed of an identical single circular flat spiral air-core coil. Every single coil has inner coil diameter (Di), outer coil diameter (Do), wire diameter (W), pitch (P) and a number of turns (N) at 25 mm, 47.8 mm, 0.643 mm, 0.03 mm, 17 respectively. The study and evaluation of several array coil pattern models show that the distance between the adjoining coil centers should be defined close to the half of coil outer diameter (1/2Do) to generate close to uniform vertical magnetic field distribution. The vertical magnetic field distribution average and magnetic field effective transmitting areas array coil model with the given coil parameters changing as the effect in variation in distances between the adjoining coil centers. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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22 pages, 8555 KiB  
Article
Design and Performance Analysis of Pads for Dynamic Wireless Charging of EVs using the Finite Element Method
by Davide De Marco, Alberto Dolara, Michela Longo and Wahiba Yaïci
Energies 2019, 12(21), 4139; https://doi.org/10.3390/en12214139 - 30 Oct 2019
Cited by 23 | Viewed by 3702
Abstract
Increasing problems of air pollution caused by petrol-fueled vehicles had a positive impact on the expanded use and acceptance of the electric vehicles (EVs). Currently, both academic and institutional researchers are conducting studies to explore alternative methods of charging vehicles in a fast, [...] Read more.
Increasing problems of air pollution caused by petrol-fueled vehicles had a positive impact on the expanded use and acceptance of the electric vehicles (EVs). Currently, both academic and institutional researchers are conducting studies to explore alternative methods of charging vehicles in a fast, reliable, and safe way that would compensate for the drawbacks of the otherwise beneficial and sustainable EVs. The wireless power transfer (WPT) systems are now offered as a possible option. Another option is the dynamic wireless charging (DWC) system, which is considered the best application of a WPT system by many practitioners and researchers because it enables vehicles to increase their driving ranges and decrease their battery sizes, which are the main problems of the EVs. A DWC system is composed of many sub-systems that require different approaches for their design and optimization. The aim of this work is to find the most functional and optimal configuration of magnetic couplers for a DWC system. This was done by performing an investigation of the main magnetic couplers adopted by the system using Ansys® Maxwell as a finite element method software. The results were analyzed in detail to identify the best option. The values of the coupling coefficients have been obtained for every configuration examined. The results disclosed that the best trade-off between performance and economic feasibility is the DD–DDQ pad, which is characterized by the best values of coupling coefficient and misalignment tolerance, without the need for two power converters for each side, as in the DDQ–DDQ configuration. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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20 pages, 6008 KiB  
Article
Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application
by Tommaso Campi, Silvano Cruciani, Francesca Maradei and Mauro Feliziani
Energies 2019, 12(18), 3483; https://doi.org/10.3390/en12183483 - 10 Sep 2019
Cited by 26 | Viewed by 5679
Abstract
A near-field wireless power transfer (WPT) technology is applied to recharge the battery of a small size drone. The WPT technology is an extremely attractive solution to build an autonomous base station where the drone can land to wirelessly charge the battery without [...] Read more.
A near-field wireless power transfer (WPT) technology is applied to recharge the battery of a small size drone. The WPT technology is an extremely attractive solution to build an autonomous base station where the drone can land to wirelessly charge the battery without any human intervention. The innovative WPT design is based on the use of a mechanical part of the drone, i.e., landing gear, as a portion of the electrical circuit, i.e., onboard secondary coil. To this aim, the landing gear is made with an adequately shaped aluminum pipe that, after suitable modifications, performs both structural and electrical functions. The proposed innovative solution has a very small impact on the drone aerodynamics and the additional weight onboard the drone is very limited. Once the design of the secondary coil has been defined, the configuration of the WPT primary coil mounted in a ground base station is optimized to get a good electrical performance, i.e., high values of transferred power and efficiency. The WPT design guidelines of primary and secondary coils are given. Finally, a demonstrator of the WPT system for a lightweight drone is designed, built, and tested. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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24 pages, 4188 KiB  
Article
Analysis of Battery Reduction for an Improved Opportunistic Wireless-Charged Electric Bus
by Andong Yin, Shenchun Wu, Weihan Li and Jinfang Hu
Energies 2019, 12(15), 2866; https://doi.org/10.3390/en12152866 - 25 Jul 2019
Cited by 9 | Viewed by 2829
Abstract
As an attractive alternative to the traditional plug-in charged electric vehicles (EVs), wireless-charged EVs have recently been in the spotlight. Opportunistically charged utilizing the wireless-charging infrastructure installed under the road at bus stops, an electric bus can have a smaller and lighter battery [...] Read more.
As an attractive alternative to the traditional plug-in charged electric vehicles (EVs), wireless-charged EVs have recently been in the spotlight. Opportunistically charged utilizing the wireless-charging infrastructure installed under the road at bus stops, an electric bus can have a smaller and lighter battery pack. In this paper, an improved opportunistic wireless-charging system (OWCS) for electric bus is introduced, which includes the opportunistic stationary wireless-charging system (OSWCS) and opportunistic hybrid wireless-charging system (OHWCS) consisting of stationary wireless-charging and dynamic wireless-charging. A general battery reduction model is established for the opportunistic wireless-charged electric bus (OWCEB). Two different battery-reduction models are built separately for OWCEB on account of the characteristics of OSWCS and OHWCS. Additionally, the cost saving models including the production cost saving, the operation cost saving and total cost saving are established. Then, the mathematical models are demonstrated with a numerical example intuitively. Furthermore, we analyze several parameters that influence the effectiveness of battery reduction due to the application of an opportunistic wireless-charging system on an electric bus. Finally, some points worth discussing in this work are performed. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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18 pages, 8175 KiB  
Article
Near Field Wireless Powering of Deep Medical Implants
by Tommaso Campi, Silvano Cruciani, Valerio De Santis, Francesca Maradei and Mauro Feliziani
Energies 2019, 12(14), 2720; https://doi.org/10.3390/en12142720 - 16 Jul 2019
Cited by 31 | Viewed by 3310
Abstract
This study deals with the inductive-based wireless power transfer (WPT) technology applied to power a deep implant with no fixed position. The usage of a large primary coil is here proposed in order to obtain a nearly uniform magnetic field inside the human [...] Read more.
This study deals with the inductive-based wireless power transfer (WPT) technology applied to power a deep implant with no fixed position. The usage of a large primary coil is here proposed in order to obtain a nearly uniform magnetic field inside the human body at intermediate frequencies (IFs). A simple configuration of the primary coil, derived by the Helmholtz theory, is proposed. Then, a detailed analysis is carried out to assess the compliance with electromagnetic field (EMF) safety standards. General guidelines on the design of primary and secondary coils are provided for powering or charging a deep implant of cylindrical shape with or without metal housing. Finally, three different WPT coil demonstrators have been fabricated and tested. The obtained results have demonstrated the validity of the proposed technology. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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22 pages, 15705 KiB  
Article
Challenges in the Electromagnetic Modeling of Road Embedded Wireless Power Transfer
by Vincenzo Cirimele, Riccardo Torchio, Antonio Virgillito, Fabio Freschi and Piergiorgio Alotto
Energies 2019, 12(14), 2677; https://doi.org/10.3390/en12142677 - 12 Jul 2019
Cited by 32 | Viewed by 3466
Abstract
In this paper, starting from the experimental experience of the road embedment of a transmitting coil for wireless power transfer, a numerical model of such device is constructed. The model is then used to perform several parametric analyses which aim at investigating the [...] Read more.
In this paper, starting from the experimental experience of the road embedment of a transmitting coil for wireless power transfer, a numerical model of such device is constructed. The model is then used to perform several parametric analyses which aim at investigating the influence of the main electromagnetic parameters of the concrete and the geometrical parameters of the wireless power transfer on the overall behavior of the device. The results of such study allow for providing guidelines for the design of the coil and the choice of the materials for the embedment. Moreover, as a secondary result of the adopted methodology, the electromagnetic characterization of the concrete adopted for the road embedment is obtained. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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11 pages, 4404 KiB  
Article
A Frequency Locking Method for ICPT System Based on LCC/S Compensation Topology
by Yansong Li, Minhao Wang, Weiwei Zhang, Mengmeng Zhao and Jun Liu
Energies 2019, 12(13), 2626; https://doi.org/10.3390/en12132626 - 08 Jul 2019
Cited by 5 | Viewed by 2387
Abstract
Aiming to maximize the transmission efficiency of inductively coupled power transmission (ICPT) system with the designed output power, a frequency locking method for an ICPT system based on LCC/S compensation topology is proposed in this paper. Firstly, the relationship between compensation component L [...] Read more.
Aiming to maximize the transmission efficiency of inductively coupled power transmission (ICPT) system with the designed output power, a frequency locking method for an ICPT system based on LCC/S compensation topology is proposed in this paper. Firstly, the relationship between compensation component Lf1 and output power was deduced by the lossless model, and the initial value of Lf1 was obtained. Then, considering the system loss, the designed output power and frequency were input into the frequency locking program, and Lf1 and other compensation parameters were dynamically tracked. At the same time, the transmission efficiency of the system was calculated, and the frequency that achieved maximum efficiency was automatically locked when the system met the requirements of the designed output power. Finally, based on the method, the output characteristics of the system were verified by experiments. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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19 pages, 3450 KiB  
Article
Design and Realization of a Multiple Access Wireless Power Transfer System for Optimal Power Line Communication Data Transfer
by Sami Barmada, Mauro Tucci, Nunzia Fontana, Wael Dghais and Marco Raugi
Energies 2019, 12(6), 988; https://doi.org/10.3390/en12060988 - 14 Mar 2019
Cited by 14 | Viewed by 2428
Abstract
In this contribution, the authors evaluate the possibility of using separated access points for power and data transfer in a coupled Wireless Power Transfer-Powerline Communication system. Such a system has been previously proposed by the authors for specific applications, in which Wireless Power [...] Read more.
In this contribution, the authors evaluate the possibility of using separated access points for power and data transfer in a coupled Wireless Power Transfer-Powerline Communication system. Such a system has been previously proposed by the authors for specific applications, in which Wireless Power Transfer (WPT) should take place in a system where data are transmitted over the power grid. In previous works the authors have performed lab tests on a two coils WPT system equipped with a set of filters to also allow an efficient data transfer. When a multiple coil WPT system is chosen, additional possibilities arise: the access point for power and data can be differentiated, with the aim of maintaining the designed power efficiency and increase data transfer capacity. In this study a four coils WPT system is thoroughly analyzed, modelled, implemented and measured, and a set of guidelines for the correct design (in terms of performance optimization) of the data transfer is given. Full article
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
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