Article
Engineering, Electrical & Electronic
Jinde Wu, Xin Dai, Yue Sun, Yanling Li
Summary: This article proposes a flexible repeater power transmission mode for multinode WPT system, allowing for flexible switching of node roles to meet dynamic power transmission requirements, utilizing reusing topology. Experimental results confirm the effectiveness of the method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Zhen Zhang, Hongliang Pang, Stephan H. K. Eder, Ralph Kennel
Summary: This article proposes an autonomous current compensation scheme, the self-balancing virtual impedance, to enhance the transmission performance of multiple-pickup wireless power transfer system. Experimental results demonstrate that the method effectively increases the primary exciting current and transmission power.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yixiang Yao, Abubakar Uba Ibrahim, Wenxing Zhong
Summary: The article proposes a design methodology for three-resonator WPT systems to achieve a constant output power in a wide coupling range. It reviews the basic characteristics of the three-resonator WPT system and presents the proposed design methodology in detail.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Zhenghao Zhu, Aijun Yang, Huan Yuan, Cheng Zhao, Fuguo Chen, Xiaohua Wang, Mingzhe Rong
Summary: This article studied the effects of currents of transmitting coils on transmission efficiency mathematically. A method of maximum efficiency tracking and power allocation for omnidirectional wireless power transfer to multiple receivers was proposed, and a mutual inductance identification method based on primary feedback is presented. The above methods are experimentally verified, and two receivers can be charged with 58.8% efficiency and the power ratio can be precisely controlled from 0 to 100%, which is difficult for conventional methods.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Zhen Yue, Qiaoli Zhang, Zhouming Yang, Rui Bian, Deshuang Zhao, Bing-Zhong Wang
Summary: In this paper, a wall-meshed cavity resonator is proposed to address the issue of wireless communication signal blocking in traditional cavity resonance wireless power transfer (CR WPT). The proposed system can achieve simultaneous wireless power transfer in the cavity and wireless communications with outside, with a high power transfer efficiency.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Shuo Liu, Jianhui Su, Jidong Lai, Jian Zhang, Haibo Xu
Summary: This article establishes an accurate model for mutual inductance of planar spiral coils and proposes an expression for mutual inductance of planar spiral coils under arbitrary relative positions using Euler Angles. The influence of precession and spin angle on mutual inductance is studied, as well as the differences in calculation results between the accurate model and traditional approximation models.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Hwa-Rang Cha, Kwang-Rock Park, Tae-Jin Kim, Rae-Young Kim
Summary: An optimal magnetic structure was proposed to improve the efficiency of omnidirectional wireless power transfer without increasing the size of the transmitter. Through finite element analysis and multiobjective optimization design, the optimal magnetic structure was selected and a prototype was built for performance verification. Experimental results demonstrated that the optimal magnetic structure improved system efficiency in three-dimensional space.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
Ata Ollah Mirzaei, Mahdi Asadi, Hamed Ghanbarpour, Amir Musa Abazari, Hadi Tavakkoli
Summary: This paper proposes a new method for calculating the mutual inductance between two arbitrarily positioned, non-identical n-sided planar spiral coils, and verifies the accuracy of the calculation results. The method is not only applicable to coils of different shapes, but also capable of handling errors such as lateral displacement and angular rotation. Experimental results show that the method has a significant advantage in terms of computational time.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Engineering, Electrical & Electronic
Hyungchul Kim, Seon-Jae Jeon, Dong-Wook Seo
Summary: This paper investigates the influence of mutual inductance ratio on the efficiency of multi-transmitter wireless power transfer systems. It is found that when the ratio of the minimum to maximum mutual inductances is 0.5 or more, systems with identical transmitter currents can achieve near-optimal efficiency without the need for current fine-tuning. Additionally, a stacked multi-transmitter system is proposed, which achieves high mutual inductance ratios and satisfies the condition, leading to a significant improvement in the transmission distance.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Ruiying Chai, Amir Mortazawi
Summary: This article proposes a new wireless power transfer circuit that utilizes two passive nonlinear resonators to adapt to varying coupling factors, providing constant output power without the need for complex control circuitry, frequency tuning, or coil configurations. A 60-W nonlinear wireless power transfer prototype circuit operating at 1.5 MHz demonstrates significant performance improvement in maintaining near-constant output power while the distance between coils varies.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Hui Wen Rebecca Liang, Hanwei Wang, Chi-Kwan Lee, S. Y. Ron Hui
Summary: This article presents a methodology for analyzing the effects of intended metallic object on a wireless power transfer system, quantifying how the metallic object could change the magnetic coupling and alter the resonant tank parameters. Recompensation of the resonant tank can improve power transfer capability but not energy efficiency. A new performance-enhancement method based on recompensating the resonant tanks and maximizing the mutual inductance of the transmitter and receiver coils is proposed.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Lin Yang, Shuai Jiang, Can Wang, Changsong Cai, Li Zhang
Summary: In this manuscript, a compact dual-channel wireless power transfer system with a power-boosting function based on dual-sided decoupling coils is proposed. The system solves the problems of low semiconductor power rating, insufficient system compactness, and difficulty in system design in traditional high-power WPT systems. The proposed magnetic coupler allows the superposition of two independent WPT systems without cross-coupling interference, enabling power boosting while ensuring compactness. The theoretical analysis, output power comparison, and experimental results confirm the feasibility and magnetic decoupling characteristic of the proposed system.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Kerui Li, Jiayang Wu, Abdulkadir C. Yucel, Shu-Yuen Ron Hui
Summary: This study proposes a new printed-circuit-board (PCB) resonator structure for mega-hertz wireless power transfer. The novel design improves the resonant frequency, transmission efficiency, and resistance quality factor of the resonator, leading to significant performance enhancements compared to conventional designs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Taejun Lim, Yongshik Lee
Summary: A stacked-coil technology has been demonstrated to address lateral misalignment in nonradiative wireless power transfer systems. The system consists of multiple layers of coils with various sizes, allowing for the best transfer efficiency coil pair to be switched on depending on the misalignment. Experimental results show that the transfer efficiency can be maintained at high levels under different misalignment conditions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Conghui Lu, Xiutao Huang, Xiong Tao, Xiaobo Liu, Cancan Rong, Yingqin Zeng, Minghai Liu
Summary: Wireless power transfer system is crucial for smart home automation, and this study introduces a dual-band omnidirectional 3-D WPT system to efficiently charge wireless sensors. The system achieves high efficiency in transmitting power to sensors operating at different frequencies.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Huangyan Li, Shi Chen, Filippo Costa, Yi Wang, Qunsheng Cao, Wen Wu, Agostino Monorchio
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Tao Liang, Sami Barmada, Nunzia Fontana, Yan-zhao Xie, Danilo Brizi, Agostino Monorchio
Summary: The use of magnetic metasurfaces in Wireless Power Transfer systems is a popular research topic that has been proven to increase power transfer performance and improve EMC properties. In this study, the susceptibility of these systems to Electromagnetic Interference (EMI) is investigated, and different parameters for selected system components are evaluated. The worst-case scenarios for voltage peak, energy, and sharpness at transmitting and receiving ports and each capacitor of the metasurface are calculated. The results show that the metasurface may not necessarily reduce susceptibility to EMI and can be the most critical component itself. Identification of key parameters provides insights into the proper design of metamaterials used as shielding devices.
INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS
(2023)
Article
Chemistry, Analytical
Mauro Tucci
Summary: This study presents a new approach for hydroelectric basin modelling, which was applied to the Pontecosi basin in Italy. The model utilizes various data sources, including weather stations, satellite observations, reanalysis dataset, and basin data. It consists of three cascade modules aimed at predicting the water level in the basin. The model incorporates different spatial interpolation methods, a neural network, and a non-linear auto regressive exogenous input (NARX) model to achieve accurate predictions within specific time horizons.
Article
Engineering, Electrical & Electronic
Angelica Masi, Danilo Brizi, Agostino Monorchio
Summary: This article presents the design and fabrication of a microwave contactless sensor for detecting millimetric inclusions in a biological medium. The sensor configuration consists of a self-resonant planar spiral resonator (SR) inductively coupled to an external concentric single-loop probe, operating at 648 MHz. The detection is achieved by measuring both the amplitude variation and frequency shift of the input impedance of the reading probe. Full-wave simulations and experimental verification demonstrate the effectiveness of the sensor in detecting air bubbles in hemodialysis procedures and highlight its potential use in biomedical applications.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Danilo Brizi, Maria Conte, Agostino Monorchio
Summary: In this article, a new antenna utilizing specially designed metasurfaces is introduced to improve radiating performance near the human body in microwave biomedical applications. Design guidelines are presented to realize a thin metasurface acting as an impedance matching layer between the radiating element and biological tissue. Additionally, an artificial magnetic conductor (AMC) is combined as the backing element of the antenna for the first time to improve gain and reduce undesired back radiation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Analytical
Alessandro Betti, Mauro Tucci
Summary: In this work, a simple, fast, and efficient network called YOLO-S is proposed for small target detection task. It utilizes a small feature extractor and skip connection, along with a reshape-passthrough layer, to promote feature reuse and combine low-level positional information with high-level information. The performance of YOLO-S is evaluated on AIRES and VEDAI datasets, and it outperforms four baselines in terms of accuracy. The experiments demonstrate that transitional learning on a combined dataset can enhance overall accuracy. YOLO-S is faster than YOLOv3 and only slightly slower than Tiny-YOLOv3, while achieving higher accuracy on VEDAI dataset. It is also suitable for search and rescue operations according to simulations on SARD dataset. Additionally, YOLO-S has a smaller model size and lower computational complexity, making it deployable for low-power industrial applications.
Article
Chemistry, Analytical
Sami Barmada, Paolo Di Barba, Alessandro Formisano, Maria Evelina Mognaschi, Mauro Tucci
Summary: Direct measurement of electric currents can be difficult, so magnetic sensors are used to estimate the currents based on the measured magnetic fields nearby. However, this approach is classified as an Electromagnetic Inverse Problem (EIP), and careful treatment of the sensor data is required to obtain accurate current measurements. This paper proposes a systematic study of different learning parameters and regularization techniques for accurately reconstructing EIP models. Both traditional methodologies and neural approaches are described and compared in the study.
Article
Environmental Sciences
Matteo Oliva, Lucia De Marchi, Alessia Cuccaro, Giorgia Fumagalli, Rosa Freitas, Nunzia Fontana, Marco Raugi, Sami Barmada, Carlo Pretti
Summary: Non-chemical anthropogenic stressors, such as artificial lights, noise, and magnetic fields, underestimated their effects on wildlife, especially in marine environments near urbanized coastal areas. This study evaluated the effects of static magnetic fields from submerged electric cables on the gametes and early life stages of Ficopomatus enigmaticus, a serpulid polychaete. Magnetic fields of 1 mT, commonly found near submerged cables, showed significant impacts on sperm cells' membranes, DNA integrity, kinetic parameters, and mitochondrial activity. Fertilization rate was also reduced after 3 hours of exposure to this magnetic induction level. Our findings provide a starting point for future research on magnetic field effects on early life stages of aquatic invertebrates and their role as ecological indicators of sediment quality.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Electrical & Electronic
Eliana Canicatti, Danilo Brizi, Angelica Masi, Nunzia Fontana, Agostino Monorchio
Summary: This study compares the electromagnetic exposure of representative human models with different body features and genders when exposed to near-field, high-power, and broadband devices. The results show that the WBA-SAR is mainly related to the total body weight, while the 10-g SAR varies along with the frequency range. Guidelines for exposure reduction and physical considerations are also presented.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Energy & Fuels
Alessandra Ghilardi, Guido Francesco Frate, Mauro Tucci, Mirko Bravi, Roberto Leo, Lorenzo Ferrari
Summary: This paper investigates the ability of a Thermal Storage (TS) to balance thermal load fluctuations and forecast errors using a Machine Learning (ML) thermal load forecast model for short-term predictions up to 48 hours. A case study of a large greenhouse powered by a CHP plant in Tuscany is conducted to validate the TS performance at different volumes. The results show that Support Vector Machine (SVM) algorithm performs the best, utilizing the TS capacity more effectively and leading to a more stable trend in State of Charge (SOC) for the system to operate within the expected conditions for up to 80% of the year.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Electrical & Electronic
Sami Barmada, Paolo Di Barba, Nunzia Fontana, Maria Evelina Mognaschi, Mauro Tucci
Summary: In this work, a Deep Learning approach based on a Conditional Variational Autoencoder (CVAE) and a Convolutional Neural Network (CNN) is used to solve inverse problems and electromagnetic field reconstruction. The method is applied to the TEAM 35 benchmark magnetostatic problem. The proposed method aims to determine the magnetic field distribution in the whole domain based on the known magnetic field distribution in a subdomain (field reconstruction problem), and identify the geometrical characteristics of the source based on the known magnetic field distribution in the whole domain (source identification problem), using a CVAE and a CNN regression model respectively.
IEEE JOURNAL ON MULTISCALE AND MULTIPHYSICS COMPUTATIONAL TECHNIQUES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Eliana Canicatti, Navid Ghavami, Gianluigi Tiberi, Agostino Monorchio
Summary: Microwave imaging is recognized as a promising alternative for medical applications like breast cancer screening. This paper discusses a new fitting approach for evaluating Green's function and its application to microwave imaging. The approach accurately reconstructs dielectric maps and reduces image noise and artifacts.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Article
Computer Science, Information Systems
Pierpaolo Usai, Danilo Brizi, Agostino Monorchio
Summary: In this paper, the operative limits and conditions of low frequency magnetic metasurfaces in practical Wireless Power Transfer applications are analyzed. The theoretical modeling of similar structures has been demonstrated in the literature, but practical aspects and differences from real scenarios are highlighted and discussed. Numerical simulations are used to analyze the effect of resistive losses on metasurface performance and the deviations caused by interactions with additional radiofrequency coils. Detailed conditions and solutions to mitigate these detrimental effects are derived. This work guides the design process of low frequency magnetic metasurfaces for optimal performance in Wireless Power Transfer applications.
Article
Engineering, Electrical & Electronic
Alessandro Corucci, Eliana Canicatti, Roberto Flamini, Pierpaolo Usai, Christian Mazzucco, Agostino Monorchio
Summary: This article presents an effective methodology for evaluating the isolation between co-located antennas in a rapid computational time. The proposed method is based on the near-field equivalent representation of antennas combined with the ray tracing method. It is suitable for any type of antenna with any configuration and considers the presence of support structures and surrounding obstacles. Validated through simulations and measurements, the method shows consistent and accurate results with a high level of accuracy and reliability.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2023)