Article
Engineering, Electrical & Electronic
Taejun Lim, Yongshik Lee
Summary: This study develops a reconfigurable coil array to address the misalignment issue in magnetic resonance coupled wireless power transfer systems. Experimental results show that this technology can successfully increase transfer efficiency and overcome the limitations of traditional coils.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Zhifan Li, Qijun Deng, Fengwei Chen, Pan Sun, Jiangtao Liu, Wenshan Hu, Hong Zhou
Summary: This article proposes a method of input design for wireless power transfer (WPT) systems based on receding horizon D-optimization. The system's dynamic behavior is characterized by a discrete-time, single-input, single-output (SISO) model, and the model parameters are estimated using a recursive least-squares (RLS) method. The excitation signal of the system is designed based on receding horizon D-optimization to improve the quality of parameter estimates. The sequential quadratic programming (SQP) method is employed to solve the receding horizon D-optimization for improving convergence and efficiency of the input design process. Numerical and experimental results demonstrate the effectiveness of the proposed method.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Nguyen Minh Tran, Muhammad Miftahul Amri, Je Hyeon Park, Dong In Kim, Kae Won Choi
Summary: This paper investigates the application of multifocus techniques in RIS-assisted WPT systems, proposes three methods to achieve multifocus charging for multiple IoT devices, and validates the effectiveness of these methods through experiments.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Automation & Control Systems
Kai Li, M. Yousof Naderi, Ufuk Muncuk, Kaushik Roy Chowdhury
Summary: This article presents the design and implementation of a wireless power transfer system based on magnetic resonance with a novel metasurface layer. The system utilizes MetaResonance to shape the magnetic field, allowing for reconfigurable energy shaping and beamforming to charge multiple devices. The advantages of MetaResonance include high-power delivery with safety guarantees, high efficiency, and customizable power distribution profile. The system consists of a power distribution layer and a MetaResonance cell array layer. Experimental results demonstrate the reconfigurability of power and energy fields, with high efficiency and the ability to block the magnetic field within 2 cm. Various real-world charging applications have been demonstrated.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Kai Li, Yousof Naderi, Ufuk Muncuk, Kaushik R. Chowdhury
Summary: This article introduces iSurface, the first-of-its-kind self-powered reconfigurable intelligent surface that can engineer ambient wireless propagations and charge multiple devices close to the surface. The authors develop a resonance coupling power distribution framework that allows flexible and on-demand power spots on 2D and 3D surfaces.
IEEE COMMUNICATIONS MAGAZINE
(2021)
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
Shurui Liu, Tianqi Lu, Zhong Tang, Zhiyuan Chen, Junmin Jiang, Bo Zhao, Sijun Du
Summary: In this article, a reconfigurable regulating rectifier with a wide operational range for wireless power transfer is proposed. The rectifier achieves a broad range voltage regulation without global loop control and extends the voltage regulation range by adding more working modes and greater voltage gain. A local loop control scheme is proposed for voltage rectification with three modes, which adaptively senses the duty cycle of the mode signal to determine the working mode of the rectifier. The proposed system demonstrates a peak power conversion efficiency of 87.4% and a voltage conversion ratio between 0.95X and 2.68X.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Mingyang Chang, Jiaqi Han, Yicen Li, Xiangjin Ma, Haixia Liu, Long Li
Summary: This article proposes a novel self-powered polarization-reconfigurable rectenna for wireless power transfer (WPT) systems. The rectenna utilizes a three-state-reconfigurable network and a high-efficiency rectifier network to achieve efficient wireless power transmission. The measured results show that the proposed rectenna has a maximum conversion efficiency of 66% at 5.8 GHz and a conversion efficiency higher than 50% in the incident power range from 21 to 30 dBm. It can flexibly adjust the polarization state without an extra dc power source, making it suitable for various applications in WPT systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Wenxing Zhong, Fei Xiang, Changsheng Hu
Summary: In this letter, a method for metal object detection (MOD) is proposed, using detection coils perpendicular to power coils. The theoretical voltage in the detection coils is zero when no metal object is present. However, when a metal object is placed on the Tx pad, it induces an eddy current, resulting in a voltage in the detection coils. This method is able to function well even with misalignments between the Tx and Rx pads, and does not require adjustments for different winding positions. The concept has been successfully validated through experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhongyu Dai, Wenxi Peng, Zhenfa Wang, Musong Li, Yitong Zhou, Ran Wang, Ting Chen, Xian Zhang, Junhua Wang
Summary: A reconfigurable receiver is proposed in this paper to adaptively adjust the mutual inductance and meet the power requirements of different loads and stages.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Kisong Lee, Sung Ho Chae
Summary: This study compares the achievable transmission efficiency between three-coil and four-coil systems in magnetic resonant wireless power transfer, finding optimal control parameters for performance improvement. Experiments conducted in various environments confirm the validity of observations and accuracy of theoretical analysis.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
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, Industrial
Halldor Arnarson, Hussein Mahdi, Bjorn Solvang, Bernt Arild Bremdal
Summary: Reconfigurable Manufacturing Systems (RMS) can adjust their productivity quickly to meet market changes and demand for high-variety products through a rearrangeable structure. Wireless Power Transfer (WPT), as an Industry 4.0 technology, can enhance RMS flexibility by providing safe, reliable, and maintenance-free autonomous charging. This paper examines wireless electrification of RMS by investigating different WPT configurations, proposing a battery charging platform for increased flexibility. Capacitive charging systems are tested as a low-cost WPT solution with 135 W power transfer capability at a 5 cm distance and 84% efficiency.
JOURNAL OF MANUFACTURING SYSTEMS
(2023)
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
Computer Science, Information Systems
Min Li, Hao Li, Pengfei Ma, Heng Wang
Summary: This article focuses on the charging process in UAV-enabled wireless power transfer systems and proposes V-shaped and Inverted Trapezoidal WPT schemes to maximize the energy received by ground nodes. Two algorithms are developed to solve the optimization problems. Simulation results show improved performance in terms of energy consumption, efficiency, and fairness compared to other schemes.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Neha Beniwal, Glen Ghias Farivar, Hin Sang Lam, Salvador Ceballos, Naga Brahmendra Yadav Gorla, Josep Pou, Shu Yuen Ron Hui, Frede Blaabjerg
Summary: This article proposes a dual-layer modulation technique for controlling the average neutral-point current in NPC converters. The technique uses two modulation layers to independently synthesize the voltage reference and ANC reference, and offers faster dynamics and reduced mathematical computations compared to conventional approaches.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Huawei Yuan, Hin Sang Lam, Neha Beniwal, Josep Pou, Shu-Yuen Ron Hui
Summary: A new modulation method called good-switching (GS) PWM is proposed in this article for balancing capacitor voltages. It is simple to design and can be used for any level of topology, and potentially applicable to other multilevel converters.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jiayang Wu, Sinan Li, Siew-Chong Tan, Shu Yuen Ron Hui
Summary: In order to achieve a wide voltage variation of EV battery packs, the traditional LLC converter needs to operate over a wide frequency range, which complicates the magnetics design and decreases efficiency. To solve this problem, a frequency folding technique is proposed and explained using a new LLC converter. The proposed converter utilizes both the inductive region and the capacitive region of the LLC converter during the charging process, effectively reducing the operating frequency and maintaining zero-voltage switching for higher overall efficiency. A detailed description of the design procedure for the proposed converter is provided. A scaled-down 400-W prototype with 200 V input and 120 V-210 V output range verified the advantages of the proposed concept and achieved a measured efficiency of 98% at maximum output power.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Shu-Yuen Ron Hui, Yun Yang, Cheng Zhang
Summary: The first generation of wireless power transfer (WPT) standard Qi, launched in 2010, aimed to maximize compatibility and attract manufacturers. This compatibility feature led to the growth of a wireless power market for a decade. The authors argue for a paradigm shift from compatibility to optimal performance in terms of energy efficiency and charging time, considering the increasing power of WPT applications. They also discuss several enabling technologies for this paradigm shift.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Jiali Zhou, Zilin Li, Chi-Kwan Lee, Ka Wing Chan, Shu Yuen Ron Hui
Summary: The integration of power and information infrastructures in the smart grid requires more sensors and online monitoring systems on high-voltage transmission towers. These systems are typically powered by solar panels or wind turbines that are weather-dependent. This study proposes a weather-independent power supply solution that utilizes PCB resonators embedded in a 35-kV composite insulator to evaluate the complete system of energy harvesting, wireless power transfer, and output power stages. A coordinated control scheme of transmitter-side and receiver-side converters is proposed to regulate the constant current or constant voltage throughout the charging process, allowing the system to adjust output based on different battery charging profiles without wireless communication between the transmitter and receiver.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Zhihong Yan, Ying Huang, Siew-Chong Tan, Chuyang Y. Tang, Shu Yuen Hui
Summary: In this article, a self-adaptive-step-size incremental-resistance MPPT technique is proposed to extract maximum power from RED stacks. It is simple and easy to implement, and realizes a balance between fast dynamic responses and small oscillations at a steady state. Various tests are conducted to validate the effectiveness of the proposed MPPT technique.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chen Zhu, Wenxing Zhong
Summary: Modularization is an effective method for high-power wireless power transfer (WPT) by modifying the number of modules. However, the cross couplings among modules complicate power transfer paths, making it difficult to achieve stable output regulation. This article proposes a decoupling control method to compensate for the adverse effects of cross couplings, allowing individual output control for each module. A 7-kW two-module WPT prototype is built for experimental verification.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Hui Wen Rebecca Liang, Yun Yang, Liangxi He, Jialong Qu, Chi Kwan Lee, Shu Yuen Ron Hui
Summary: This article proposes a multi-hysteresis temperature-regulated current control (MTRCC) technique that can improve battery charging speed without additional hardware costs. By dividing the hysteresis band of the conventional JEITA-compliant control into multiple segments, the number of charging current levels is increased, resulting in faster charging according to the analysis. This approach has the potential to be an alternative to the state-of-the-art TRCC in JEITA guidelines for single-cell charging applications. Empirical results demonstrate that the proposed MTRCC achieves faster charging than the conventional control at different ambient temperatures, with a more significant improvement at higher temperatures.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Huawei Yuan, Hin Sang Lam, Neha Beniwal, Siew-Chong Tan, Josep Pou, Shu-Yuen Ron Hui
Summary: Capacitor voltage imbalance in NPC converters is a well-known problem, and existing solutions are either costly in terms of hardware or involve complex algorithms. This article proposes a new control method called direct-switch duty-cycle control (DSDCC) that addresses the issue and achieves near-optimal performance with simple implementation. By directly considering the duty cycles of switches, DSDCC can generate gating signals with only one carrier and derive near-optimal duty cycles, simplifying the controller design. Experimental results validate the effectiveness of DSDCC with a 5L-NPC converter.
IEEE TRANSACTIONS ON INDUSTRIAL 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
Engineering, Electrical & Electronic
Wenxing Zhong, Fei Xiang, Changsheng Hu
Summary: In this letter, a method for metal object detection (MOD) is proposed, using detection coils perpendicular to power coils. The theoretical voltage in the detection coils is zero when no metal object is present. However, when a metal object is placed on the Tx pad, it induces an eddy current, resulting in a voltage in the detection coils. This method is able to function well even with misalignments between the Tx and Rx pads, and does not require adjustments for different winding positions. The concept has been successfully validated through experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Huawei Yuan, Hin Sang Lam, Neha Beniwal, Siew-Chong Tan, Josep Pou, Shu Yuen Ron Hui
Summary: This article proposes a voltage-balancing control solution for the MV-ES system through the cooperation of diode-clamped converters (DCCs) and dual active bridges (DABs). By taking advantage of the DABs in voltage balancing, the DCCs can adopt simple modulation to ensure grid-friendly voltage and current injection into the power grid.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Wenxing Zhong, Sijia Bai, Changsheng Hu
Summary: This paper introduces a PFC modulated WPT method which can achieve PFC function through phase-shift modulation of the primary-side inverter in a series-series (SS) WPT system. A closed-loop control method is proposed for practical implementation. The idea is verified through theoretical analysis and experimental results.
Article
Automation & Control Systems
Shu-Yuen Ron Hui, Albert T. L. Lee, Jiayang Wu, Siew Chong Tan
Summary: This article presents a novel dimmable technology for passive LED drivers by adding a switchable parallel capacitor to reduce power. The practical results confirm the effectiveness of this technology in real applications.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(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)
