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
Zhimeng Liu, Lifang Wang, Yanjie Guo, Shufan Li
Summary: This article proposes a primary-side linear control strategy for wireless power transfer system to achieve constant current (CC)/voltage (CV) charging. The strategy combines magnetic integration on the primary side and non-compensation topology on the secondary side to reduce the size of the compensation inductor and make the system more compact. The improved load parameters identification method is used to accurately identify the current, voltage, and equivalent resistance of the load. The experiments show that the proposed control strategy achieves high accuracy in CC and CV charging.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Xiaoqiang Wang, Minrui Leng, Xin Zhang, Hao Ma, Bin Guo, Jianping Xu, Chi-Kwan Lee
Summary: This article explores the systematic synthesis of primary high-order compensation topology (PHCT) for wireless charging system and its applicability to subharmonic control (SHC). It reveals that four types of PHCTs are superior in performance when applied with SHC. Furthermore, experimental results on a prototype with jointly applying SHC and PHCT are examined.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Changsong Cai, Maryam Saeedifard, Junhua Wang, Pengcheng Zhang, Jiansong Zhao, Yunshan Hong
Summary: This article presents a cost-effective dynamic wireless power transfer (DWPT) system that efficiently charges autonomous moving equipment. The proposed system utilizes a low-cost segmented configuration and a flexible operating strategy. The configuration combines a dynamic T-series/series topology and extended transmitter (Tx) coils to eliminate cross-coupling impact and achieve resonance. The extended Tx coil is designed to improve misalignment tolerance and reduce the number of Tx segments. With an operating principle consisting of three modes, the system maximizes the efficient coupling area of individual Tx segments and improves efficiency during the transition region. Position detection and power regulation methods are developed to coordinate the segmented coils and mitigate power fluctuation. The system's performance and effectiveness are evaluated through experimental results on a scaled-down prototype.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yiming Zhang, Yuanchao Wu, Chao Liu, Mingzhu Zhou, Yizhan Zhuang
Summary: This letter proposes a hybrid topology of the inductor-capacitor-capacitor-series (LCC-S) and three-coil structures with load-independent output to achieve misalignment tolerance. From the central to the boundary positions, the output power of the three-coil structure decreases while that of the LCC-S topology increases. In this way, the output power can be stabilized against misalignment. Besides, the system can achieve constant voltage output characteristic.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Automation & Control Systems
Hao Feng, Alireza Dayerizadeh, Srdjan M. Lukic
Summary: The article introduces a primary-side X-type compensation topology for inductive power transfer systems to achieve stable power transfer against various magnetic coupling variations without the need for strict control and coil design. The X-type compensation provides stable output characteristics and enhanced tolerance to position shifts, suitable for low power IPT systems with high mobility demands.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Automation & Control Systems
Xin Gao, Shuai Dong, Shumei Cui, Chunbo Zhu
Summary: A three-phase dynamic wireless charging system with balanced primary currents can result in a constant induced voltage. However, a three-phase primary and single-phase secondary (TS) system may have unbalanced and varying reflected impedances, requiring the study of suitable three-phase inverters and compensation topologies. This article accurately describes the unbalanced reflected impedances of the TS system and proposes a three-phase LCC topology to address these issues.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Zixi Liu, Mei Su, Qi Zhu, Lei Zhao, Aiguo Patrick Hu
Summary: This study presents a dual-frequency tuning method for improved coupling tolerance of an inductively coupled wireless power transfer system, and a dual-frequency hybrid compensation topology is designed to achieve suppression of output power variations against coupling changes.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Mostak Mohammad, Omer C. Onar, Gui-Jia Su, Jason Pries, Veda Prakash Galigekere, Saeed Anwar, Erdem Asa, Jonathan Wilkins, Randy Wiles, Cliff P. White, Larry E. Seiber
Summary: This article introduces the design and demonstration of a bidirectional 20-kW wireless charging system with a significantly large air gap and asymmetrical input-output voltage levels. Analytical and experimental sensitivity analyses were conducted to verify the optimal operating region, while a variety of technologies were utilized in the design to improve efficiency and power density.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2021)
Article
Engineering, Electrical & Electronic
Chi Shing Wong, Man-Chung Wong, Lingling Cao, K. H. Loo
Summary: Maintaining constant-current and constant-voltage outputs for lithium-ion batteries poses challenges due to leakage and magnetizing inductances of loosely coupled transformers. Designing a compensation network with load-independent output characteristics can help mitigate these challenges, but once the designed compensation deviates from the nominal coupling condition, the desired characteristics may be lost. This article investigates a dynamic series/series-parallel compensation network as an alternative topology for CC-CV battery chargers, providing a new design criterion for effective parallel compensation capacitance to maintain desirable charging currents in the CC stage and maximize efficiency in the CV stage under varying coupling conditions.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Review
Energy & Fuels
Kai Song, Yu Lan, Xian Zhang, Jinhai Jiang, Chuanyu Sun, Guang Yang, Fengshuo Yang, Hao Lan
Summary: Wireless charging technology is an important trend in future EV power supply due to its safety, flexibility, and convenience. This study reviews the research status of the interoperability of EV wireless charging technology, including its definition, composition, standards, evaluation methods, and existing problems and challenges.
Article
Computer Science, Information Systems
Shaocong Zhou, Chunbo Zhu, Leran Zheng, Shumei Cui, C. C. Chan
Summary: This paper investigates the LCC primary topology utilizing switches for two transmitters with strong inter-coupling. The drawbacks of the current LCC topology utilizing switches are analyzed, and a modified LCC topology with a different switch location is proposed to address the issues of over-voltage, power loss, and reactive power. Two connection modes of the modified topology are investigated to reduce over-voltage on switches. A two-coil LCC compensated charging system is built to confirm the feasibility of the modified topology and verify the theoretical analysis of performance in the two connection modes.
Article
Engineering, Electrical & Electronic
Sevilay Cetin, Yunus Emre Demirci
Summary: This paper focuses on wireless power transfer (WPT) based on magnetic coupling resonance for delivering power to a cardiac pacemaker externally. The key aspects explored are high-efficiency power delivery, implantation, and safety, with the LC-S compensation topology used for wireless charging and validated through a prototype operating at 300 kHz. The prototype achieved an efficiency of 82.39% at 4.2V output voltage and 0.45A output current, and safety evaluation based on literature reference values was also discussed.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2022)
Article
Computer Science, Information Systems
Chien-Lung Chen, Chung-Wen Hung
Summary: Adding a core to the coupling coil improves transmission efficiency, but the self-inductance increases at high temperatures due to the temperature-sensitive core material permeability. To prevent excessive output power decrease at high temperatures, a minor resistance is added to lower the cutoff frequency and compensation capacitances on the resonant circuit are adjusted to increase output power. This approach ensures that the output power remains high even at elevated temperatures.
Article
Engineering, Electrical & Electronic
Kai Song, Yu Lan, Ruizhi Wei, Guang Yang, Fengshuo Yang, Weihan Li, Jinhai Jiang, Chunbo Zhu, Yunwei Li
Summary: This article proposes a control method based on the variable inductor and capacitor to improve power output in wireless charging systems with weak coupling. The study demonstrates that by regulating the variable inductor and capacitor, zero phase angle input and full output power can be achieved under certain misalignment. Experimental results confirm the effectiveness of the proposed method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhaoyang Yuan, Maryam Saeedifard, Changsong Cai, Qingxin Yang, Pengcheng Zhang, Hongjian Lin
Summary: This article presents an optimized design for a wireless power transfer (WPT) system with dual-coupled inductor-capacitor-capacitor-series (LCC-S) compensation. The system achieves zero-phase angle (ZPA) input condition and load-independent constant current (CC) output.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Chemical
Ming Xue, Hu Hou, Longnv Li, Jianwu Guo, Pengcheng Zhang, Gaojia Zhu
Summary: This paper studies the characteristics of four dual-load systems based on near-field resonance wireless power transmission and analyzes the influence of different coupling methods on system performance. The experimental results show that the efficiency and received power of the system vary with different coupling methods, suitable for different power transmission requirements.
Article
Energy & Fuels
Zhaoyang Yuan, Qingxin Yang, Xian Zhang, Xianjie Ma, Zhixin Chen, Ming Xue, Pengcheng Zhang
Summary: Wireless power transfer (WPT) enables power transmission wirelessly over certain distances through the magnetic coupling of transmitter and receiver coils. However, load variation and misalignment between magnetic couplers affect stability and efficiency. High-order compensation topologies are essential to suppress these effects, but high-power-level and high-frequency inductor design poses challenges for WPT systems. This paper reviews existing high-order compensation topologies and their integration principles for high misalignment tolerance in WPT, discusses design objectives and challenges, and investigates control systems to cope with coil misalignment and load variations.
Article
Engineering, Electrical & Electronic
Pengcheng Zhang, Xinjie Yu, Qingxin Yang, Xian Zhang, Zhaoyang Yuan, Zhen Li, Yongjian Li, Ming Xue
Summary: Core saturation is a critical issue in high-power-level wireless charging. A coil-based desaturation strategy is proposed to address this problem without altering the original coil design. The strategy involves connecting a planar coil and solenoids in series with a capacitor to achieve a capacitive quasi-resonating status. The effectiveness of the proposed strategy is verified through finite element analysis and experimental results.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Engineering, Electrical & Electronic
Junhua Wang, Chenlu Wang, Changsong Cai, Ruixuan Chen
Summary: This paper presents a combinable wireless power transfer (WPT) system for unmanned aerial vehicles (UAVs) with autonomous and adaptive charging of extensible capacity. By combining multiple transmission modules in parallel to power the UAV, the charging capacity of the system is dramatically enhanced and is adaptive to multiple power ratings with more flexibility. An active current ripple mitigation scheme is proposed to regulate the Rx currents and mitigate the synthetic current ripple without onboard sensors, achieving current ripple cancellation.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Energy & Fuels
Zhaoyang Yuan, Qingxin Yang, Xian Zhang, Xianjie Ma, Ran Wang, Ming Xue, Pengcheng Zhang
Summary: This paper proposes a cooperative (Cx) coil design for the series-series-series (S-S-S)-compensated wireless power transfer (WPT) system to improve the horizontal misalignment tolerance and the system efficiency. The Cx coil is formed by four series-connected rectangular coils and integrated into the transmitter (Tx) coil to provide a coupling variation opposite to that of the Tx coil, obtaining the constant equivalent mutual inductance (MI). The proposed design can maintain over 82% efficiency and offer the zero-phase-angle (ZPA) input and load-independent constant current (CC) output within a misalignment tolerant range of 50% of the length of the receiver coil.
Article
Engineering, Electrical & Electronic
Lizhou Liu, Zhaotian Yan, Bin Xu, Pengcheng Zhang, Changsong Cai, Huazhong Yang, Lu Zhang, Shunli Wang
Summary: A single-magnetic bidirectional integrated equalizer for hybrid energy storage systems is proposed in this paper. It utilizes a multi-winding transformer and voltage multiplier to balance the voltages of battery and supercapacitor strings. The proposed equalizer simplifies the balance circuit by using fewer components compared to previous circuits, while still achieving voltage balance. Experimental results validate the effectiveness of the proposed circuit in balancing the hybrid energy storage system during the operation of the DC-DC converter.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(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
Engineering, Electrical & Electronic
Lin Yang, Shuai Jiang, Can Wang, Changsong Cai, Li Zhang
Summary: In this manuscript, a compact dual-channel wireless power transfer system with a power-boosting function based on dual-sided decoupling coils is proposed. The system solves the problems of low semiconductor power rating, insufficient system compactness, and difficulty in system design in traditional high-power WPT systems. The proposed magnetic coupler allows the superposition of two independent WPT systems without cross-coupling interference, enabling power boosting while ensuring compactness. The theoretical analysis, output power comparison, and experimental results confirm the feasibility and magnetic decoupling characteristic of the proposed system.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Junhua Wang, Yang Luo, Changsong Cai, Ming Xue, Fan Zhang, Leke Wan
Summary: This paper presents a composite decoupling method for the 2D wireless power supply array based on compensation topology and orthogonal coupling. The proposed method can eliminate cross coupling between Tx coils in multiple directions and significantly reduce costs.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Qiye Zhang, Changsong Cai, Yanpu Zhao, Junhua Wang, Fan Zhang, Yang Luo, Xi Wu
Summary: This article proposes an adaptive feedback regulation method to solve the problem of input voltage drop caused by emergency power supply in wireless power transfer systems. The method achieves constant voltage output by adjusting the duty cycle of the DC/DC converter, and the output characteristics under different load conditions are analyzed using finite element simulation. The performance and effectiveness of the design are verified through experimentation.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Construction & Building Technology
Chunguang Li, Hubin Yan, Minhao Zou, Yan Han, C. S. Cai, Long Wang
Summary: The influence of maintenance track on the vortex-induced vibration (VIV) performance of a main girder in a large-span steel box girder suspension bridge was studied. Experimental results showed that moving the maintenance track inward significantly improved the VIV performance of the main girder and reduced pressure fluctuation. This finding is of great importance for the stability and safety of suspension bridges.
FRONTIERS IN BUILT ENVIRONMENT
(2023)
Article
Engineering, Civil
Wen Xiong, Ibrahima Diaw, Yanjie Zhu, Hongwei Zhang, C. S. Cai
Summary: Terrestrial laser scanning technology is widely used in bridge maintenance, but there are challenges when it comes to long-span bridges. To overcome the issue of scan geometry affecting the accuracy of point cloud data, researchers have developed a portable auxiliary reflector. In-field tests conducted on the Ma'anshan Yangtze River Bridge have shown that this method can obtain high-precision point cloud data for long-span bridges and enable further deformation analysis.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2023)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Chenlu Wang, Junhua Wang, Changsong Cai, Ruixuan Chen
Summary: This digest introduces a compound magnetic position detection method for wide-area dynamic wireless charging that enables dynamic positioning in two dimensions. By arranging electromagnetic sensors on the transmitter coils and installing a permanent magnet on the receiver, the horizontal distance between the sensors and the receiver can be accurately measured. Additionally, the coupling law is investigated to recognize the approximate position of the receiver, enhancing the overall accuracy. The designed detection method coordinates the switching between transmitter coils and optimizes the performance of the wide-area DWPT system in a cost-effective manner.
TWENTIETH BIENNIAL IEEE CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION (IEEE CEFC 2022)
(2022)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Changsong Cai, Junhua Wang, Yang Luo, Ming Xue, Yunshan Hong, Chenlu Wang
Summary: The digest introduces a self-decoupling and active-shielding coil design to extend the wireless charging area and reduce leakage flux. The design utilizes inside SD coils to neutralize cross mutual inductance and outside AS coils to actively suppress leakage flux.
TWENTIETH BIENNIAL IEEE CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION (IEEE CEFC 2022)
(2022)
