Article
Engineering, Electrical & Electronic
Yuanchao Wu, Chao Liu, Mingzhou Zhou, Xingkui Mao, Yiming Zhang
Summary: This article presents a wireless power transfer (WPT) method for electric vehicle charging system with antioffset characteristic. The method is based on dual coupled transmitting coils with antiparallel windings, forming the inductor-capacitor-capacitor-series (LCC-S) topology. The T-shaped equivalent circuit is developed to obtain the decoupling circuit. By utilizing the misalignment tolerant characteristic of the antiparallel windings, the two transmitting coils are designed to have the same coil structure, resulting in stable output voltage within a certain misalignment range. An experimental prototype is built to verify the effectiveness of the proposed method, with the output voltage remaining stable within the specified range.
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
Samir Chowdhury, Md Tawhid Bin Tarek, Md Ehsanul Haque, Yilmaz Sozer
Summary: This article proposes a two-layer overlapping winding-based three-phase wireless vehicle charging system that offers higher coupling and balance inductance matrices compared to conventional systems, resulting in enhanced efficiency and coupling.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Energy & Fuels
Yiming Zhang, Zhongjin Huang, Hui Wang, Chao Liu, Xingkui Mao
Summary: A hybrid topology combining series-series and inductor-capacitor-capacitor-parallel is proposed to achieve misalignment tolerance. The magnetic couplers utilize unipolar and bipolar coils for power transfer. The theoretical analysis is verified through simulation in MATLAB/Simulink, demonstrating the success of achieving misalignment tolerance.
Article
Engineering, Electrical & Electronic
Yiming Zhang, Wenbin Pan, Hui Wang, Zhiwei Shen, Yuanchao Wu, Jiqing Dong, Xingkui Mao
Summary: This letter proposes a misalignment-tolerant dual-transmitter EV wireless charging system with a reconfigurable topology, which solves the misalignment issue along the door-to-door direction while maintaining high-efficiency stable output.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Kaibo Chen, Zhen Zhang
Summary: This article proposes a fast and real-time mutual inductance estimation method for drone in-flight wireless charging systems. The critical challenge for in-flight wireless charging systems is to track variations of mutual inductance caused by continuously changed misalignments between coupling coils, which is rarely explored in previous studies. The proposed rotating-coordinate-based estimation method effectively enhances the rapidity and simplicity of the estimation process, while eliminating wireless communication links. With the features of accuracy, rapidity, and real-time performance, it can be an ideal solution for drone in-flight wireless charging systems.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Vivek Kumar Srivastava, Ashwani Sharma
Summary: This study presents a planar switchable multicoil transmitter antenna to solve the problem of angular misalignment in near-field wireless power transfer. The antenna utilizes switching control to generate a switched polarized H-field, maximizing link efficiency through optimal alignment with the receiver coil.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Chi Dat Pham, Thanh Long Nguyen, Ha-Van Nam, Minh Thuy Le
Summary: This letter presents a novel transmitting coil structure consisting of tilted loops to enhance the stability of wireless power transfer systems in the presence of lateral misalignment. With an optimal tilted angle, the power transfer efficiency remains above 80% at lateral distances approximately equal to two-thirds of the transmitter size. This proposed coil structure significantly improves system stability without the need for additional circuits and control algorithms.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
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
Automation & Control Systems
Junming Zeng, Jiayang Wu, Kerui Li, Yun Yang, Shu Yuen Ron Hui
Summary: This article proposes a fast and accurate real-time estimation method for developing a dynamic battery circuit model on the primary side of a SS-compensated WPT system. By detecting the current of the transmitter resonator only, important parameters such as charging voltage, charging current, and state-of-charge can be accurately estimated in real time. The battery equivalent circuit can be transferred to the primary side for control.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhenjie Li, Jiafang He, Yusheng Huo, Mingfei Ban, Yiqi Liu, Jiuqing Liu
Summary: This article introduces a wireless charging system with two reconfigurable transmission channels, which achieves constant current/voltage charging, anti-misalignment ability, and zero voltage switching operation. The design and working principle of the orthogonal magnetic coupler are described, and the coupling performance is simulated using Ansys. The topology and principle of the designed wireless charging system are analyzed, and the relationship between charging controllability, misalignment performance, and system parameters is discussed. A magnetic flux controllable inductor is used for power adjustment and improvement of anti-misalignment ability. PLECS simulations confirm the feasibility of the design goals, and an experimental prototype is built to validate the method's feasibility.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Fan Zhang, Yong Xiao, Leke Wan, Bin Qian, Changsong Cai, Xiaoming Lin, Jianlin Tang
Summary: This paper proposes an input-parallel output-series wireless power transfer scheme with modular extension and misalignment tolerance to improve the energy pick-up capability of wireless charging during the movement of automatic vehicles. The scheme includes dual inductor-capacitor-capacitor (LCC) and series capacitor compensated WPT channels. Asymmetrical coupling coils based on the magnetic field distribution optimization are employed for tolerance performance under misalignment. An output voltage control method is implemented to regulate the output voltage without communication, improving efficiency and avoiding channel damage. Experimental results verify the performance of the proposed scheme.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Sang-Won Lee, Young-Kyun Cho
Summary: This paper proposes a single-stage wireless battery charging circuit that is capable of constant current and constant voltage charging modes without the need for complex control algorithms or additional components, showcasing excellent performance.
Article
Automation & Control Systems
Eun S. Lee
Summary: This article proposes a switching frequency-modulation-based inductive power transfer system that provides wireless charging for scooters through magnetic in-band communication. The proposed system allows for charging even when the transmitter and receiver coils are misaligned, without the need for additional power converters. The use of magnetic in-band communication enables the modulation of the switching frequency to control the load power for charging the battery in the receiver side. This magnetic communication protocol is optimally designed for scooter wireless charging applications, reducing coil misalignment sensitivity and communication complexity.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jun Ma, Zhenjie Li, Yiqi Liu, Mingfei Ban, Wenlong Song
Summary: The temperature rise in wireless charging systems (WCS) hinders their reliability and material lifespan. This article proposes a thermal design and optimization method to address this issue. The method uses electromagnetic-thermal simulation to predict the temperature of the magnetic coupler and employs multiobjective optimization to select suitable parameters. The proposed method's correctness is validated through experimental prototyping.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Hongliang Pang, K. T. Chau, Wei Han, Wei Liu, Zhen Zhang
Summary: In this article, a dual-resonating-frequency compensation topology is proposed for exciting the decoupled-double D transmitting coils in the dual-frequency wireless power transfer systems. The proposed scheme allows for dual-channel transmission and arbitrary power distribution.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Electrical & Electronic
Libing Cao, K. T. Chau, Christopher H. T. Lee, Tengbo Yang
Summary: This article comprehensively analyzes split-tooth stator-slot permanent-magnet (ST-SSPM) machines with different permanent magnet (PM) arrangements. Four types of ST-SSPM machines are introduced and classified based on PM positions and polarities. The operation principles are explained and slot-pole combinations are derived from the field modulation theory. Additionally, global optimization is conducted on four types of ST-SSPM machines with different slots and rotor poles to achieve maximum torque and minimum torque ripple. The electromagnetic performances of the optimal designs are thoroughly analyzed using finite-element analysis (FEA). Conclusions are drawn based on the analyzed results and optimal designs.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Energy & Fuels
Hang Zhao, K. T. Chau, Tengbo Yang, Zaixin Song, Chunhua Liu
Summary: A fast quasi-3D analytical model is proposed in this paper for predicting the magnetic field in axial flux motors (AFMs). By dividing the AFM into slices and using harmonic modeling method, the 3D problem is simplified into a 2D one. The saturation of soft-magnetic material is also considered. The effectiveness of the proposed model is validated by nonlinear finite element analysis.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2022)
Article
Automation & Control Systems
Wei Han, Kwok Tong Chau, Zhichao Hua, Hongliang Pang
Summary: This article introduces an integrated wireless motor system using laminated magnetic coupler (LMC) and commutative-resonant control (CRC). The system allows for flexible transfer distance, high efficiency, and maintenance-free operation.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Wei Han, Kwok Tong Chau, Wei Liu, Hui Wang, Zhichao Hua
Summary: This article proposes and implements a novel wireless power and drive transfer system using orthogonal bipolar couplers and separately excited modulation. The system can achieve concurrent wireless power transfer and wireless drive transfer via a shared transfer channel. The proposed system can effortlessly achieve wireless dc motor drive or wireless ac motor drive. Experimental results verify the feasibility and flexibility of the system.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Zhichao Hua, K. T. Chau, Wei Han, Wei Liu, T. W. Ching
Summary: This article proposes and implements an output-controllable efficiency-optimized wireless power transfer scheme using hybrid modulation. The scheme combines pulse frequency modulation (PFM) and ON-OFF keying (OOK) modulation and utilizes feedback control to maintain high system efficiency during the output voltage regulation process.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Tianlu Ma, Chaoqiang Jiang, Jingchun Xiang, Xiaosheng Wang, K. T. Chau, Teng Long
Summary: The article presents a unified full-load discrete-time (UFDT) model for the wireless power transfer (WPT) system, suitable for both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The model is derived based on the equivalent circuits and is used to analyze the characteristics of series-series (SS) compensated WPT systems in the full-load range. The study provides a theoretical reference for addressing WPT system issues, especially in DCM which has little theoretical basis. Simulations and experiments validate the UFDT model and show good agreement with the experimental results of the WPT system's full-load characteristics.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Hui Wang, K. T. Chau, Christopher H. T. Lee, Xiaoyang Tian
Summary: This article proposes and implements a wireless resolver for wireless switched reluctance motors. It can detect the rotor position and transfer the information without the need for battery storage or active components at the secondary side. By integrating wireless power transfer into a variable reluctance resolver, the proposed system offers better dynamic performance and robustness compared to previous solutions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Wei Liu, K. T. Chau, Hui Wang, Tengbo Yang
Summary: This article proposes and implements a long-range wireless power drive (WPD) system using a magnetic extender, which can be promisingly applied in underground pipeline transportations and in-pipe robots. The system uses pulse frequency modulation to enable a wireless pipeline network for flow rate regulation, with advantages of robust structure and reduced maintenance requirements. The addition of a magnetic extender provides fault tolerance capability for underground sensor-free WPD while maintaining high transmission efficiency.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Automation & Control Systems
Zhichao Hua, K. T. Chau, Wei Liu, Xiaoyang Tian, Hongliang Pang
Summary: This article presents an autonomous pulse frequency modulation (APFM) scheme for wireless battery charging using a self-excited oscillating (SEO) wireless power transfer (WPT) system with reliable zero-voltage switching (ZVS) for output power regulation. The system autonomously adjusts the operating frequency based on self-excited oscillation to deliver more power in strong coupling while maintaining high transmission efficiency. In weak coupling, it functions equivalently to a forced oscillating (FO) WPT system. Pulse frequency modulation adjusts the output power by changing the duty ratio, and reliable ZVS is achieved through current signal extraction and processing at the primary side. The feasibility of the proposed APFM for SEO-WPT system is supported by theoretical analysis and experimental verification.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Tianlu Ma, Chaoqiang Jiang, Xiaosheng Wang, Jingchun Xiang, Liping Mo, Kwok Tong Chau
Summary: A novel periodic energy control strategy for dc-dc converters is proposed in this letter. The strategy selects the port nearest to the load as the energy control target and uses a simplified energy calculation method to improve accuracy and efficiency. The method is also extended to other nonisolated dc-dc converters.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Green & Sustainable Science & Technology
Wei Liu, K. T. Chau, Xiaoyang Tian, Hui Wang, Zhichao Hua
Summary: Popularization of wireless power transfer (WPT) has led to the emergence of smart WPT that offers attractive solutions for various scenarios. The review investigates the opportunities and challenges in wireless energy modulation, conversion and intellectualization, aiming to reveal methodologies and approaches for emerging technologies in smart WPT.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Review
Physics, Applied
Calvin C. T. Chow, Francesco Grilli, K. T. Chau
Summary: This paper verifies the applicability of the integral method in situations where the external magnetic field is spatially non-uniform and applies it to calculate the ac loss in superconducting tapes.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Review
Energy & Fuels
Calvin C. T. Chow, Mark D. Ainslie, K. T. Chau
Summary: Superconducting rotating machines are more efficient, smaller and lighter than conventional ones, making them ideal for applications that require light-weight machines. This review provides an overview of the major high temperature superconducting (HTS) machines built worldwide in the 21st century, covering various types of machines and their classifications based on the form of superconductor used. The review also explains the working principles of unconventional HTS machine types and explores the practical applications of HTS machines, as well as the trends and challenges in HTS machine design.
Article
Automation & Control Systems
Hongliang Pang, Fei Xu, Wei Liu, Chi K. Tse, K. T. Chau
Summary: This article proposes an impedance buffer-based reactance cancellation method for a capacitor-inductor-capacitor-series (CLC-S) compensated wireless power transfer system with robust zero-voltage switching (ZVS). The method realizes full-range zero-phase-angle (ZPA) operation and can be regulated to ZVS switching conditions under various parameter variations. The proposed method is communication-free, feedback-free, and has simple control, making it suitable for high-order compensation systems.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)