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
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
Veli Yenil, Sevilay Cetin
Summary: This article proposes an improved pulse density modulation control for secondary side controlled wireless power transfer system. By changing the pulse density of the rectifier switches, the output voltage can be regulated and the current and voltage ripples are reduced.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Wei Han, K. T. Chau, Libing Cao, Zhichao Hua, Tengbo Yang
Summary: This article introduces a wireless power transfer system with S-CLC compensation and PFM control for dimmable LPS lamps. The technology addresses the risks associated with high-voltage operation of LPS lamps in humid environments, while also providing maintenance-free lighting under all weather conditions. The proposed system achieves effective dimming control, reduced operating frequency, and ZVS for LPS lamps.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Automation & Control Systems
Xu Liu, Chenyang Xia, Xiaozuo Han, Zhen Wu, Zhijuan Liao
Summary: This article proposes a novel method for simultaneous wireless power and information transmission (SWPIT), addressing the issues of interference and complex circuit design in wireless power transfer systems. By establishing a stroboscopic mapping model and optimizing parameter design, the simultaneous transmission of power and information is achieved, and the correctness and effectiveness of the method are verified through experiments.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhichao Hua, K. T. Chau, Wei Liu, Xiaoyang Tian
Summary: This article proposes and implements an advanced pulse frequency modulation scheme to adjust the output power of the wireless power transfer system. The scheme improves the efficiency of energy transfer and reduces switching loss.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Computer Science, Information Systems
Bing Cheng, Liangzong He
Summary: This paper proposes a WPT system based on the simplest S/S compensation network, which achieves load-independent constant output by using an L-C branch to replace the secondary compensation capacitor, resulting in fewer components and a simpler control strategy compared to existing research.
Article
Engineering, Electrical & Electronic
Jingxiang Gao, Junhong Zhang, Qingguo Song, Zhongni Zhu, Liang Qian
Summary: This article proposes a single-stage inverter with the LLC topology, utilizing a hybrid control strategy and topology-morphing to achieve narrow frequency range and full soft-switching. The operating principles and characteristics are analyzed in detail, and key parameters are designed. Experimental results demonstrate that the proposed inverter, with an input of 480 V and output of 220 V/50 Hz, achieves a maximum efficiency of 97.6%.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jianqiang Liu, Yu Ai, Shaoyong Chen, Zehui Zhang, Yunming Shi
Summary: This article studies the traditional control strategy for the L-LLC resonant converter and its limitations, proposes a novel constant width PFM method, and achieves better control performance through hybrid modulation.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Peichao Xu, Huiqing Wen, Wanjun Hao, Yong Yang, Jieming Ma, Yiwang Wang, Jiafeng Zhou
Summary: Efficiency and power density of power converters for interfacing photovoltaic panels, energy storage components, and loads in photovoltaic systems are becoming increasingly important. The nonisolated switching capacitor-integrated three-port converter has been proposed to achieve single-stage direct power conversion among three ports, with pulse-width modulation and pulse-frequency modulation for flexible power regulation and power balance among the ports.
Article
Engineering, Biomedical
Woojin Park, Gyeongho Namgoong, Eunho Choi, Franklin Bien
Summary: This paper presents a triple mode buck converter for implantable medical devices that utilizes an on-/off-time sensing-based load-adaptive mode control. The converter can achieve low power consumption and high power conversion efficiency by adjusting the control mode. The experimental results show seamless mode transition and a peak power conversion efficiency of approximately 94.3% at 80 mA.
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Jinde Wu, Xin Dai, Yue Sun, Yanling Li
Summary: This article proposes a flexible repeater power transmission mode for multinode WPT system, allowing for flexible switching of node roles to meet dynamic power transmission requirements, utilizing reusing topology. Experimental results confirm the effectiveness of the method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Wei Liu, Chao Hu, Lijuan Xiang
Summary: This study proposes a multimodal modulation scheme to consider various output characteristics and working conditions in wireless charging of electric vehicles. By controlling the impedance working conditions, optimal performance can be achieved and verified in experiments.
Article
Engineering, Electrical & Electronic
Yuying Wu, Ning He, Min Chen, Dehong Xu
Summary: A general ZVS-SVM method for three-phase inverters with arbitrary output is proposed in this article, with detailed discussions on vector selection and vector sequence arrangement principles to achieve operation within wide power factor angle range and ZVS. The effectiveness of the method is verified through experiments.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Yiming Zhang, Xin Li, Shuxin Chen, Yi Tang
Summary: This article investigates the soft switching operations of the inverter and rectifier in a strongly coupled series-series wireless power transfer system. Through time-domain analysis, it is found that a dual-side 90 degrees phase shift can avoid the hard switching of the inverter, enhance power level, and eliminate noise.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Shengdao Zhu, Jinghua Ji, Wenxiang Zhao, Guohai Liu, Christopher H. T. Lee
Summary: This article focuses on electromagnetic vibration and its reduction design in the consequent pole permanent magnet (CPM) machines. Two new designs are proposed to reduce the vibration caused by unbalanced radial force, and the prototypes are manufactured and tested to validate the theoretical analysis and proposed vibration reduction design.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Libing Cao, Guanghui Yang, Yuefei Zuo, Yaojie He, Chenhao Zhao, Shuangchun Xie, Christopher H. T. Lee
Summary: This article introduces a CR-BIFM machine with an open-slot structure for wind power generation. The machine utilizes two CR rotors coupled with two sets of wind turbine blades, capturing more wind energy compared to single-rotor turbines. Due to its dual-flux-modulation effect, the CR-BIFM machine exhibits high torque/power density, making it suitable for direct-drive wind power generation. The advantages of the machine, such as higher efficiency and permanent magnet utilization, are comprehensively evaluated and validated with a prototype.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Hao Chen, Ayman M. EL-Refaie, Yuefei Zuo, Shun Cai, Junfei Tang, Yujing Liu, Christopher H. T. Lee
Summary: This article presents the design and analysis of a permanent magnet wind generator that is designed for variable-speed constant-amplitude voltage operation in dc power applications. A comparative study is carried out, showing that the proposed generator exhibits advantages such as high induced voltage, high torque/power density, and high efficiency compared to conventional generators. The validity of the proposed generator's operation is verified through experimental results.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Meiling Zhao, Guohai Liu, Qian Chen, Zhengmeng Liu, Xuhui Zhu, Christopher H. T. Lee
Summary: In this article, an improved sliding-mode observer algorithm with disturbance observer compensation is proposed for medium- and high-speed sensorless control of permanent magnet synchronous motors. The algorithm unifies the mathematical models of surface PMSM and interior PMSM, and uses a bandpass filter to effectively suppress dc bias and high-frequency noise. It also incorporates a disturbance observer with low-pass filter characteristics to compensate for real-time position errors caused by the digital filter. An adaptive extended state observer is added to mitigate the influence of parameter mismatch on the performance and improve estimation accuracy. The feasibility and effectiveness of the proposed observer are verified using a triple redundant permanent magnet-assisted synchronous reluctance motor as an example.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Article
Engineering, Electrical & Electronic
Yuefei Zuo, Jingwei Zhu, Wenhao Jiang, Shuangchun Xie, Xiaoyong Zhu, Wen-Hua Chen, Christopher H. T. Lee
Summary: In this article, an active disturbance rejection (ADR) controller based on the generalized integrator (GI) extended state observer (ESO) (GIESO) is proposed to suppress torque ripple and achieve smooth speed control of electric drives. A deadbeat ADR controller is used to simplify the current control algorithm. An adaptive GIESO is developed to address the instability issue caused by the two-step delay in the current control loop. By analyzing the system stability, the design guideline for the adaptive resonant gain is determined. The proposed adaptive GIESO ensures system stability across the entire speed range while suppressing speed ripple within 1 r/min.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xu Wang, Ying Fan, Can Yang, Zhanchuan Wu, Christopher H. T. Lee
Summary: This paper proposes a multi-objective optimization framework for a radial-axial hybrid excitation machine (RAHEM) in electric vehicles (EVs), aiming to improve average torque, flux regulation ability, and torque ripple. The design variables related to multiple objectives are analyzed using sensitivity stratification. Non-dominated sorting genetic algorithm II (NSGA-II) based on response surface model (RSM) is adopted for optimizing the high sensitivity layer variables, while the low sensitivity layer variables are optimized through sensitivity ranking. The proposed framework is verified through three-dimensional finite element analysis (3-D FEA) and prototype manufacturing.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Zhiqiang Zeng, Yiming Shen, Wenxiang Zhao, Xin Yuan, Shun Cai, Christopher H. T. Lee
Summary: Two brushless doubly-fed dual-stator machines (BDFDSMs) with different inner-stator field windings, namely ac and dc field windings, are proposed and investigated. The proposed machine with ac field windings exhibits higher torque density and wider flux-regulation range compared to its dc field winding counterpart. The flexibility of field current control is enhanced due to the use of ac field windings, leading to improved space utilization. The electromagnetic performances of the proposed machines are evaluated using finite element method, showing improved flux-regulation range, higher torque, and output power under the proposed sectored flux-weakening method.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Automation & Control Systems
Hao Chen, Ayman M. El-Refaie, Yuefei Zuo, Shun Cai, Junfei Tang, Yujing Liu, Christopher H. T. Lee
Summary: This article presents a permanent magnet brushless doubly fed electric machine designed for variable-speed constant-frequency wind energy generation. Unlike conventional doubly fed electric machines based on induction machines, this machine utilizes a permanent magnet rotor to provide magnetic field excitations for both the control winding and power winding. The working principle for VSCF operation is explained in detail. The machine exhibits significantly improved performance compared to a counterpart machine in terms of back-electromotive force, torque/power density, torque per magnet volume, and efficiency. A proof-of-concept prototype is fabricated and experimental results validate its VSCF function.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Shuangchun Xie, Shun Cai, Yuefei Zuo, Libing Cao, Jingwei Zhu, An Li, Yuming Yan, Christopher H. T. Lee
Summary: This article investigates a high power-factor permanent magnet vernier machine (PMVM) equipped with low-coupling hybrid concentrated-winding (CW). The proposed hybrid-CW exhibits a good filtering property and leads to a great improvement in power factor by reducing the inductance while retaining the magnet flux linkage. Finite element results show that the proposed hybrid-CW PMVM exhibits a significantly improved power factor compared to counterpart PMVMs. A prototype is fabricated and tested to validate the features of the proposed hybrid-CW PMVM.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(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
Automation & Control Systems
Shuangchun Xie, Yuefei Zuo, Hao Chen, Libing Cao, Xin Yuan, Boon Siew Han, Chi Cuong Hoang, Christopher H. T. Lee
Summary: This article examines the stator shifting technique (SST) in permanent magnet Vernier (PMV) machines with two-slot pitch winding (TSPW). The effects of various shift angles on armature magnetomotive force harmonic contents are investigated. Results show that the proper shift angles can preserve the working component and eliminate loss-producing harmonics. The implementation of different shift angles affects the stator teeth structure, which in turn affects various performance metrics.
IEEE TRANSACTIONS ON INDUSTRIAL 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)
Article
Engineering, Electrical & Electronic
Guanghui Yang, Haseeb Hussain, Sheng Li, Xiaojun Zhang, Jiaqiang Yang, Christopher H. T. Lee
Summary: Conventional space vector pulsewidth modulation (SVPWM) degrades performance of multiphase motor drives under open-phase fault. Existing solutions require reconfiguration of transformation matrices, making industrial implementation difficult. This study proposes a fault-tolerant SVPWM strategy that offers natural fault tolerance, simplified fault detection, minimum reconfiguration, torque ripple-free operation, and applicability to various open-phase faults using a single-transformation matrix. The proposed approach eliminates redundant controllers and reduces difficulty of fault diagnosis. Experimental evaluation demonstrates that torque ripple can be reduced by approximately 40% compared to conventional SVPWM strategy in the presence of multiple faults.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Meiling Zhao, Zhengmeng Liu, Qian Chen, Guohai Liu, Xuhui Zhu, Christopher H. T. Lee
Summary: A new frequency adaptive disturbance observer with band-pass filter characteristics is proposed in this article to improve the estimation accuracy of motor drives. The observer is insensitive to dc bias and high-frequency noise, and it can amplify the amplitude of the estimated active flux, improving the robustness and operating range of the system.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
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)
