Article
Engineering, Electrical & Electronic
Yao Wang, Hua Zhang, Yue Cao, Fei Lu
Summary: Wireless power transfer (WPT) is an effective solution for electric vehicle charging. This article focuses on capacitive power transfer (CPT) and explores opportunities not yet reported in existing literature, based on duality with inductive power transfer (IPT). The article proposes a generic modeling method, compares power transfer mechanisms, demonstrates duality between IPT and CPT circuits, derives 14 CPT topologies based on duality with IPT circuits, and conducts a detailed comparison of these circuits.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Engineering, Electrical & Electronic
Masoud Ahmadi, Loic Markley, Thomas Johnson
Summary: In this study, we demonstrate how a coupled-resonator structure, which is equivalent to a filter structure, can be used to design a capacitive wireless power transfer (WPT) system. This approach provides access to a wide range of standard structures and impedance scaling methods to achieve matched links.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Li Fang, Hong Zhou, Wenshan Hu, Xingran Gao, Haitang Liu, Qijun Deng
Summary: This paper presents a novel flexible capacitive power transfer (CPT) system that maintains stable output capability even under deformation of the coupler. A flexible coupler structure is achieved by using copper foil that is light, thin, and cost-effective. The frequency hand selection method and frequency splitting characteristic are deduced to ensure stable output capability, showing that moderate deformation of the copper foil coupler has negligible effects on power and efficiency when the system operates at the optimized natural resonant frequency. Finite-element analysis (FEA) is used to simulate the variation of electric field distribution in the flexible coupler. A prototype is constructed and tested in the laboratory, achieving over 147 W power transfer with an efficiency over 86% for a 100 mm air gap using a copper foil coupler with 60 μm thickness and dimensions of 30 x 16 cm. The fluctuations of received power and efficiency are less than 3.6% and 3.1%, respectively, when the bending displacement is within 40 mm. The measured results validate the feasibility of the proposed CPT system for flexible scenarios.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2022)
Review
Engineering, Electrical & Electronic
Ahmed A. S. Mohamed, Ahmed A. Shaier, Hamid Metwally, Sameh I. Selem
Summary: This paper provides a comprehensive review of wireless charging technologies, focusing on inductive, capacitive, and magnetic gear technologies. The working principles, advantages, and challenges of these technologies are discussed, and the concept of mixed wireless power transfer and magnetic gear power transfer is introduced and analyzed. The paper also reviews the research and development efforts related to these technologies and presents a comparative analysis of key performance metrics.
IET POWER ELECTRONICS
(2023)
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, Electrical & Electronic
Morten Birkerod Lillholm, Yi Dou, Xu Chen, Zhe Zhang
Summary: This article proposes a multiple-output capacitive power transfer (CPT) system using the LCCL compensation network for low-power battery charging applications. The system achieves independent output among different receivers by utilizing the constant-voltage property of the LCCL network. A design method based on the first-harmonic approximation is also proposed to minimize current stress and enable zero-voltage switching.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Kalina Detka, Krzysztof Gorecki, Przemyslaw Ptak
Summary: This article presents a new model of a dedicated air transformer for computer analyses of wireless power transfer systems. It takes into account the electric, magnetic and thermal properties of the modeled device. The results of its experimental verification are shown, along with measurements and computations of an air transformer and a wireless power transfer system containing this transformer. The influence of load resistance on the properties of the considered system is also analyzed.
Article
Engineering, Electrical & Electronic
Reza Naghash, Seyed Mohammad Mahdi Alavi, Seyed Ebrahim Afjei
Summary: This article discusses the robust control of wireless power transfer (WPT) systems using quantitative feedback theory (QFT) to design a feedback compensator and prefilter for shaping the system's frequency responses. The effectiveness of the QFT-based robust control methodology is evaluated through simulations and practical experiments and compared with other design methods. The small-signal transfer function modeling of WPT systems is also elaborated in this model-based approach.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Lixiang Jackie Zou, Qi Zhu, Charles W. Van Neste, Aiguo Patrick Hu
Summary: This article presents the modeling of a single-wire capacitive power transfer system, reveals its power transfer mechanism with strong coupling to ground, and determines the system's maximum power transfer capacity. The theoretical model is validated through experiments, showing good agreement with simulation and practical results.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Jacopo Colussi, Roberto Re, Paolo Guglielmi
Summary: This paper presents the modeling, design, and verification of a three-phase coil structure for high-power wireless power transfer in automotive applications. The analytical model is simplified for numerical design to minimize cross-coupling effects and maximize power transfer. Finite element analysis is used to verify the model and a prototype is tested to demonstrate the system's capability of transferring 100 kW with high efficiency over a 50 mm air gap.
Article
Engineering, Electrical & Electronic
Shaoge Zang, Qi Zhu, Lei Zhao, Aiguo Patrick Hu
Summary: This paper proposes a novel method for compensation network design in capacitive power transfer systems to achieve simultaneous power and data delivery. The proposed method combines ladder filter and resonant circuit designs to exhibit different characteristics under different channels. The system reduces design complexity, increases data transfer bandwidth, and maintains resonance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Heshou Wang, Ka Wai Eric Cheng, Xiaofei Li, Jiefeng Hu
Summary: A special magnetic coupler for three-coil wireless power transfer is proposed in this article, aiming to eliminate mutual inductance and improve design freedom. By using unipolar and bipolar coils, the structure can decouple the receiver coil from the source coil and maintain high efficiency under misalignment conditions. A laboratory prototype has been constructed to demonstrate the feasibility and practicality of the proposed structure.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Energy & Fuels
Zbigniew Kaczmarczyk, Marcin Kasprzak, Adam Ruszczyk, Kacper Sowa, Piotr Zimoch, Krzysztof Przybyla, Kamil Kierepka
Summary: This paper presents an inductive power transfer subsystem for an integrated motor drive, which utilizes a magnetically coupled resonant circuit and two-stage energy conversion with an appropriate control method. The prototype based on gallium nitride field effect transistors (GaN FET) in the inductive power transfer subsystem is experimentally tested, confirming the feasibility of the concept.
Article
Computer Science, Information Systems
Eun S. Lee, Byeong G. Choi, Myung Y. Kim, Seung H. Han
Summary: The research focuses on the design of IPT coils for laptop wireless charging, determining optimal turns for maximum power transfer efficiency through simulation analysis.
Article
Engineering, Electrical & Electronic
Brian S. Gu, Tharindu Dharmakeerthi, Seho Kim, Michael J. O'Sullivan, Grant A. Covic
Summary: This article proposes a reduced ferrite inductive power transfer system for electric vehicle charging, which uses ferrite-based soft magnetic composites to reduce system cost and improve mechanical robustness. The optimized system reduces ferrite volume by 63% and exhibits minimal deterioration in terms of coupling reduction and magnetic field leakage.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)