Article
Chemistry, Analytical
Hyungjun Chang, Taejun Lim, Yongshik Lee
Summary: The study demonstrated that multilayer coil technology can effectively compensate for a decrease in transfer efficiency due to lateral misalignment in practical scenarios, achieving a maximum compensation efficiency of 46.1%. Even when the multilayer structure was applied only to the Tx coil, transfer efficiency could still be compensated by 37.6%.
Article
Engineering, Electrical & Electronic
Xin Wang, Junqi Pang, Nan Zhao, Longfei Liu, Helei Dong, Qiulin Tan, Jijun Xiong
Summary: This study theoretically investigates the transmission efficiency of coils with lateral and angular misalignments. Modeling and experiments show that using a magnetic isolation material on the coil can effectively improve the electromagnetic field intensity of the system, resulting in a more efficient wireless charging system.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Hurng-Liahng Jou, Jinn-Chang Wu, Kuen-Der Wu, Chao-Yu Kuo
Summary: The proposed bidirectional dc-dc wireless power transfer system using LCC-C resonance compensation allows for bidirectional power flow, prevents coil burn out, and outputs a constant current or voltage.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Feng Wen, Chen Han, Wenhan Zhao, Kesong Ji, Zhoujian Chu
Summary: This paper presents a GIS switch state detection platform based on image recognition technology and wireless power transfer (WPT) technology, effectively addressing the difficulty of judging the switch state or defect type through manual observation. Through the analysis of the stability and anti-offset ability of the WPT system, the effectiveness of the proposed method is demonstrated.
Article
Engineering, Electrical & Electronic
Meng Wang, Guangcheng Song, Renliang Yin, Yanyan Shi
Summary: Wireless power transfer (WPT) has gained attention for its potential applications. The alignment of the transmitting and receiving coils is essential for efficient charging, as misalignment decreases the transfer efficiency. To address this, a nonlinear Duffing resonance-based anti-misalignment WPT system is proposed in this study. The system is theoretically analyzed, and the power transfer efficiency is computed. Simulations and experiments confirm the superior performance of the proposed system, with higher power transfer efficiency compared to linear systems even under axial and radial misalignments.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Review
Chemistry, Physical
Cancan Rong, Lihui Yan, Long Li, Yunhui Li, Minghai Liu
Summary: Wireless power transfer (WPT) is a technology that enables energy transmission without physical contact, utilizing magnetic and electric fields as soft media. Metamaterials offer a promising way for improving efficiency and reducing the flux density in WPT systems. This paper provides an overview of the current status and technical challenges of metamaterial-based WPT systems, including the basic principles of magnetic coupling resonant wireless power transfer (MCR-WPT), metamaterial design theory, and its application in WPT. The paper also reviews the metamaterial-based wireless energy transmission system from the perspectives of transmission efficiency, misalignment tolerance, and electromagnetic shielding, and summarizes the development trends and technical challenges of metamaterial-based WPT systems.
Article
Engineering, Electrical & Electronic
Maryam Heidarian, Samuel J. Burgess
Summary: Power transfer efficiency (PTE) is a key performance parameter in the development of resonant inductive power transfer (IPT) systems. A new figure-of-merit (FoM), called the strong coupling factor (P-scf), is proposed to find an optimum coil geometry for maximizing PTE.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Marine
Peizhou Liu, Tiande Gao, Ruixuan Zhao, Zhaoyong Mao
Summary: In this study, a coil structure compatible with the structure of autonomous underwater vehicles (AUVs) and preventing rotational misalignment has been proposed for stabilizing the output power of a wireless power transfer (WPT) system. The performance of the proposed coil structure has been experimentally evaluated and found to stably deliver 2 kW power with a dc-dc efficiency of 92.7%.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
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
Rehab S. Hassan, Taejun Lim, Hyungjun Chang, Yongshik Lee
Summary: In this study, a coil array technology is proposed to address the misalignment issue in a wireless power transfer system at 6.78 MHz. The technology allows for compensation of misalignment in any direction by switching to the coil pair with the best alignment. Experimental results demonstrate high efficiency and null-free operation with various levels of misalignment. The feasibility of the proposed method for practical applications is also confirmed.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Qingsong Yu, Wenhao Xiong, Zhaotian Yan, Ruikun Mai, Zhengyou He, Yuan Shao, Xifeng Liang
Summary: A partial power processing structure is proposed for wireless power transfer system in this article. By dividing the receiver into main receiver and auxiliary receiver, the losses and stress of the cascaded dc-dc converter are reduced, and the output ripple is minimized by controlling the switching phase.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chen Xu, Yuan Zhuang, Chaoyun Song, Yi Huang, Jiafeng Zhou
Summary: This article presents an extensible wireless power transfer system based on magnetic resonance coupling. The proposed structure ensures high power transfer efficiency by confining magnetic flux lines near the receiver. Experimental results show high efficiency under different misalignment distances, and a single-feed Tx array is constructed to increase the charging area. These designs effectively mitigate heating concerns due to magnetic field leakage and are suitable candidates for dynamic WPT applications.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Seoyeon Yoon, Taejun Lim, Yongshik Lee
Summary: In this article, a coil array technique for wireless power transfer (WPT) systems that provides maximum tolerance to misalignment in any direction is presented. The approach integrates assistant coils, consisting of a 2 x 2 array of corner coils and a center coil, with the primary coil, allowing for optimum magnetic field generation to maintain high efficiency regardless of misalignment. Experimental results demonstrate the efficacy of the system, achieving an efficiency above 70% even at misalignments of up to 116% in the lateral direction and 103% in the diagonal direction.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Energy & Fuels
Rui He, Jian Gao, Aixi Yang, Jing Zhou
Summary: A modular wireless charging system for electric buses is proposed in this study, which achieves decoupling and independent control between modules through coil layout design and bipolar-solenoid coupling structure. The system has high efficiency and high misalignment tolerance, meeting the high power requirements of electric buses.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Computer Science, Information Systems
Kisong Lee, Woongsup Lee
Summary: This study analyzes the impact of misaligned relays on output power and efficiency in magnetic resonance-based wireless power transfer systems, proposing a method to determine relay activation based on the degree of misalignment. Through simulation and experimental verification, it was found that output power is more vulnerable to relay misalignment.
