Article
Engineering, Electrical & Electronic
Adrian Amler, Nikolai Weitz, Martin Marz
Summary: In recent years, research on wireless power transfer and switched-mode power supplies with a capacitive coupling link has increased. This article proposes a converter with a resonant single-ended push-pull inverter operating at radio frequencies to drive the non-resonant capacitive power transfer link. The converter improves power transfer characteristics and offers benefits such as simplified design process and predictable voltage stress.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Seung Beop Lee, Mingi Kim, In Gwun Jang
Summary: A novel optimization-based method is proposed to determine the optimal resonant condition for multireceiver wireless power transfer systems. By iteratively updating design variables, the method has been successfully applied to single-transmitter-to-multiple-receiver WPT systems, demonstrating its performance and potential in compensating for coupling changes.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Civil
Feng Li, Xuan Sun, Siqi Zhou, Yuhang Chen, Zhibin Hao, Zhanning Yang
Summary: This paper investigated the impact of pavement material magnetization on resonant inductive coupling in wireless power transfer systems. The experiment revealed that the magnetization properties of pavement materials altered the active power and efficiency of the system. Adjusting component parameters and waterproofing between pavement layers can help mitigate the effects of magnetization and environmental factors on power transfer efficiency.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Instruments & Instrumentation
Erik Andersen, Shad Roundy, Binh Duc Truong
Summary: The study investigates the frequency dependence of the maximum output power and efficiency of two wireless power transfer systems, resonant inductive coupling (RIC) and magnetoelectric (ME). The results show that in the weak-coupling regime, the power optimization and efficiency maximization problems are equivalent and yield the same optimal load and frequency, with both topologies exhibiting similar properties.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Biomedical
Yechan Park, Seok-Tae Koh, Jeongeun Lee, Hongkyun Kim, Jaesuk Choi, Sohmyung Ha, Chul Kim, Minkyu Je
Summary: This research introduces a wireless power and data transfer IC based on frequency splitting, which can achieve power transfer and data forwarding simultaneously. By utilizing FSK modulation scheme and frequency splitting characteristic, it can achieve large power delivery, high data rate, and high power transfer efficiency at the same time.
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Wenjing Xiong, Qihui Yu, Zixi Liu, Qi Zhu, Mei Su, Lei Zhao, Aiguo Patrick Hu
Summary: This letter proposes a dual-frequency-detuning method for wireless power transfer systems to achieve a smooth power profile in large coupling variation ranges. By exploring the application of this method in a dual-frequency resonant network, the equivalent impedance of each frequency channel can be adjusted at different coupling conditions, allowing for free regulation of voltage gain and output power curves, even under high-order harmonic components of square-wave voltage excitation. A 130 W prototype is developed, and experimental results show that the maximum power fluctuation is less than 6.8% against coupling coefficient variations from 0.35 to 0.74.
IEEE TRANSACTIONS ON 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
Ananth Bharadwaj, Ashwani Sharma, Chakradhar C. Reddy
Summary: Power transfer efficiency is a critical performance parameter in wireless power transfer system design. This article proposes a novel S-parameter efficiency measurement technique that accurately assesses the system's high-frequency performance using user-calibrated source and load factors.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Electrical & Electronic
Hui Wang, K. T. Chau, Christopher H. T. Lee, Chaoqiang Jiang
Summary: This article presents a single-phase shaded-pole induction motor system designed to work in isolated environments. Compared to previous wireless systems, it uses fewer controlled switches and can operate at full resonance. By utilizing a half-bridge inverter and a dual-frequency resonant network, only two controlled switches are needed on the motor side, resulting in improved efficiency and robustness. Simulation results and experimental verification with a 30-W prototype demonstrate flexible speed control with a transfer distance of 20 mm and a transmission efficiency of 77%.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Xin Liu, Tianfeng Wang, Fei Gao, Muhammad Mansoor Khan, Xijun Yang, Daniel J. Rogers
Summary: This article proposes a new resonant inductor integrated-transformer (RIIT)-based receiver that is compact, low cost, and can adapt to different battery pack voltages without significant changes in resonant parameters. The design approach, power losses, and power transfer capacity of the proposed system are presented. Additionally, methods of natural current sharing and voltage sharing among different RIITs are proposed. A prototype of LCC-LCC WPT compatible with both 400 and 800-V battery pack voltages is built and achieves a system efficiency of 94% at 9.5 kW, verifying the feasibility and performance of the proposed receiver.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xiaodong Qing, Yugang Su, Aiguo Patrick Hu, Xin Dai, Zhe Liu
Summary: This article proposes a dual-loop control CPT system to reduce the impact of coupling misalignment and load variation. The frequency tuning is achieved by tracking the input and output voltage, allowing for accurate tracking of the CV frequency and avoiding operation at other resonant frequencies. Experimental results show that the CPT system can operate in a load-independent CC/CV mode and control the output voltage/current within 2% error even with variations in load resistance and coupling misalignment.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
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
Energy & Fuels
Xing Guo, Yongsheng Qi, Liqiang Liu, Shunyu Jia, Lijun Mi
Summary: This paper proposes a hybrid self-switching resonant topology based on LCL-LCL/S to achieve constant current and constant voltage switching in a wireless charging system. The parameter optimization design method avoids the uncertainty of parameter selection. Experimental results demonstrate the system's excellent constant current and constant voltage output characteristics.
Article
Energy & Fuels
Xing Guo, Yongsheng Qi, Liqiang Liu, Shunyu Jia, Lijun Mi
Summary: A hybrid self-switching resonant topology based on LCL-LCL/S is proposed to reduce switching devices and passive components in the charging system, simplify the control strategy, and achieve constant current and constant voltage switching. The parameter optimization design method for the hybrid resonant topology network is proposed to avoid parameter uncertainty and provide theoretical basis for parameter selection. The experimental results show improved output characteristics in constant current and constant voltage mode.
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)
