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A Dual-Band Coil Array With Novel High-Order Circuit Compensation for Shielding Design in EV Wireless Charging System

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2024年第3期71卷 2545-2555页

作者： He, Xiangrui Zeng, Yingqin Liu, Renzhe Lu, Conghui Rong, Cancan Liu, Minghai Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan 430074 Peoples R China China North Vehicle Res Inst Beijing 100072 Peoples R China China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Jiangsu Peoples R China

For the wireless power transfer (WPT) system in electric vehicle (EV) applications, a serious concern lies in the leakage electromagnetic field (EMF) emission. In order to address this issue, this article presents a dual-band coil array (DB-CA) with novel high-order circuit (HOC) compensation. The most attractive feature of DB-CA is that both the first and third harmonics of leakage EMF can be reduced simultaneously, while the system still resonates at the same frequency. A detailed mathematical model is established to intuitively reveal the relevance between impedance design and shielding performance, as well as the constraints to achieve resonance. In addition, the novel HOC compensation is employed to decouple the shielding design at each harmonic. Both simulated and experimental results verify the effectiveness of DB-CA, and a 1-kW WPT prototype operating at 85 kHz is established. By applying DB-CA, the leakage EMF can be reduced by 3.88 dB at 85 kHz and 1.84 dB at 255 kHz, respectively. Meanwhile, the system resonant frequency still locates at 85 kHz, and the achieved zero-phase angle condition is independent with load condition. It can provide significant guidance to the design of shielding configurations in EV wireless charging system.

关键词： electromagnetic field (EMF) harmonic shielding system resonance wireless power transfer (WPT)

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Design and Optimization of Vertically Integrated Four-Leg Matrix Transformer for Bidirectional LLC Converter

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2025年第4期72卷 3840-3850页

作者： Li, Yong Bao, Junyang Liu, Bangyin Duan, Shanxu Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan 430074 Peoples R China

Due to the advantages of high efficiency and compact size, a bidirectional inductor-inductor-capacitor (LLC) converter is suitable for a 48 V residential photovoltaic and energy storage system (PV-ESS). A vertically integrated four-leg matrix transformer structure is proposed to integrate four inductor cells and four transformer cells into one magnetic component to allow the inductor and transformer to be optimized independently and reduce the core loss. To adapt to residential PV-ESS applications, the resonant tank parameters, resonant frequency, and winding turns are carefully optimized to target California Energy Commission weighted efficiency (CEC efficiency). In addition, a modified "8" type winding with current sharing is proposed to improve the layout of the power stage. Furthermore, a geometry optimal design guideline of the proposed matrix transformer based on finite element analysis (FEA) is given. Finally, a 300 kHz 400 V/52 V 3.5 kW bidirectional LLC converter is demonstrated. The 3-D-stacked assembly prototype achieves a peak efficiency of 98.6%, a CEC efficiency of 98.3%, and a power density of 550 W/in(3).

关键词： Transformers Inductors Magnetic resonance Legged locomotion Windings Batteries Transmission line matrix methods LLC converter magnetic integration matrix transformer vertically integrated transformer

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Three-Phase Interleaved Bidirectional LLC Resonant Converter With Vertically Integrated Magnetics for Energy Storage System Applications

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2025年第4期40卷 5371-5383页

作者： Bao, Junyang Li, Yong Liu, Bangyin Duan, Shanxu Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan 430074 Peoples R China

The bidirectional LLC resonant converter is increasingly adopted in energy storage systems due to its notable attributes such as high efficiency, high power density, and low electromagnetic interference (EMI). To extend output power and minimize current ripple, a common strategy is paralleling multiple-phase interleaved converters, which has been proved to offer superior efficiency and power density. This article introduces a three-phase interleaved bidirectional LLC resonant converter with vertically integrated magnetics. By integrating transformers and inductors through a shared magnetic plate, the volume of magnetics is reduced. This configuration enables flux cancellation in both forward and backward operation modes, leading to reduced core loss and enhanced converter efficiency. The proposed reluctance model is employed to analyze the impact of zero-sequence magnetic flux and magnetizing current. Through an optimal design procedure, a 400 V/48 V 3.5 kW prototype is implemented, achieving a peak efficiency of 98.6% and California Energy Commission (CEC) efficiencies of 98.32% and 98.25% for forward and backward operation modes, respectively. The prototype also reaches a power density of 500 W/in(3).

关键词： Interleaving magnetic integration bidirectional dc/dc converter bidirectional dc/dc converter LLC resonant converter LLC resonant converter

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Using 2-D Core and Origami Winding to Push the First Resonant Frequency of Nanocrystalline Common-Mode Inductors Beyond 10 MHz With Improved Performance

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2024年第10期39卷 11997-12002页

作者： Zhang, Rongrong Iqbal, Atif Wang, Shuo Jiang, Chaoqiang Long, Teng Qiu, Jian Wu, Deliang Liu, Kefu Zhao, Hui Fudan Univ Sch Informat Sci & Technol Shanghai 200433 Peoples R China Qatar Univ Elect Engn Doha 2713 Qatar Univ Florida Elect & Comp Engn Gainesville FL 32611 USA City Univ Hong Kong Dept Elect Engn Hong Kong Peoples R China Univ Cambridge Dept Engn Elect Engn Div Cambridge CB2 1TN England Shanghai Univ Sch Mechatron Engn & Automat Shanghai 200444 Peoples R China

The first resonant frequency (f(R)) is usually believed to be mainly determined by material properties. Therefore, nanocrystalline common-mode inductors are typically used at frequencies below several tens of kilohertz. This letter proposes an inductor with a 2-D core and origami winding to increase the first f(R) without changing the material. Especially, for nanocrystalline, the proposed 2-D structure increases the first f(R) to over 10 MHz and preserves the high permeability of nanocrystalline. Furthermore, this proposed 2-D structure also sharply reduces near-field radiation and enhances heat dissipation. Applying the proposed inductor in an electromagnetic interference filter with a boost converter verifies the effectiveness of our proposed inductor.

关键词： Common-mode inductor electromagnetic interference (EMI) nanocrystalline 2-D Common-mode inductor electromagnetic interference (EMI) resonant frequency (f(R)) resonant frequency (f(R)) 2-D

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Electron beam irradiation in collaboration with Bi-Fe MOFs for oxidation of bisphenol A and reduction of Cr(VI): Kinetics, DFT calculation and mechanism

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JOURNAL OF ENVIRONMENTAL CHEMICAL engineering 2024年第6期12卷

作者： Liu, Dan He, Junhui Wang, Ruirui Zhao, Zhen Dong, Zhen Bao, Qiburi Zhao, Long Yang, Miao Wuhan Univ Technol Sch Chem Chem Engn & Life Sci Wuhan 430072 Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Chem & Chem Engn Wuhan 430074 Peoples R China

In this study, a novel three-dimensional bimetallic-organic framework (Bi-Fe MOFs) was successfully synthesized and evaluated for the synergy with electron beam irradiation on oxidation of Bisphenol A (BPA) and reduction of hexavalent chromium (Cr(VI)). The results demonstrated that the electron beam irradiation, in collaboration with the Bi-Fe MOFs, not only facilitated the oxidative degradation of BPA but also promoted the reduction of Cr (VI). At 5 kGy irradiation, the removal rate of BPA increased from 64.52 % to 87.96 % in the presence of Bi-Fe MOFs and Cr(VI), the mineralization ratio increased from 10.14 % to 27.32 % while Bi-Fe MOFs was added. Regeneration experiments indicated that the Bi-Fe MOFs possessed good reusability. The effect of various water matrices in EBI&Bi-Fe MOFs systems revealed that the degradation of BPA and the reduction of Cr(VI) were less effective in lake water and tap water. In addition, the coexistence of inorganic anions also has an effect. Moreover, the studies in the presence of different radical scavengers suggested that oxidative free radicals(center dot OH) was the primary reactive species for BPA oxidation degradation, while eaq- was the main reactive species for Cr (VI) reduction. Finally, through liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) calculations, three possible pathways for BPA transformation were proposed: single electron transfer, C-C bond cleavage, and hydroxylation.

关键词： Electron beam Metal organic frameworks Bisphenol-A degradation Cr(VI) reduction Synergistic effects

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Poloidal magnetic field reconstruction by laser-driven ion-beam trace probe in spherical tokamak

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Plasma Science and technology 2024年第11期26卷 58-64页

作者： Zuyu ZHANG Tianchao XU Chijie XIAO Xianli HUANG Renchuan HE Ruixin YUAN Xiaoyi YANG State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China Harbin Institute of Technology Harbin 150001People’s Republic of China

The poloidal magnetic field( B_(p)) plays a critical role in plasma equilibrium, confinement and transport of magnetic confinement devices. Multiple diagnostic methods are needed to complement each other to obtain a more accurate B_(p) profile. Recently, the laser-driven ion-beam trace probe(LITP) has been proposed as a promising tool for diagnosing B_(p) and radial electric field( E_(r)) profiles in tokamaks [Yang X Y et al 2014 Rev. Sci. Instrum. 85 11E429]. The spherical tokamak(ST) is a promising compact device with high plasma beta and naturally large elongation. However, when applying LITP to diagnosing B_(p) in STs, the larger B_(p) invalidates the linear reconstruction relationship for conventional tokamaks, necessitating the development of a nonlinear reconstruction principle tailored to STs. This novel approach employs an iterative reconstruction method based on Newton's method to solve the nonlinear equation. Subsequently,a simulation model to reconstruct the B_(p) profile of STs is developed and the experimental setup of LITP is designed for EXL-50, a middle-sized ST. Simulation results of the reconstruction show that the relative errors of B_(p) reconstruction are mostly below 5%. Moreover, even with 5 mm measurement error on beam traces or 1 cm flux surface shape error, the average relative error of reconstruction remains below 15%, initially demonstrating the robustness of LITP in diagnosing B_(p) profiles in STs.

关键词： laser-driven ion-beam trace probe poloidal magnetic field diagnostic iterative reconstruction

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Advances in In Situ Characterization Techniques for Failure Mechanisms of Zinc Anode Interfaces

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ENERGY MATERIAL ADVANCES 2025年 6卷

作者： Zhang, Di Lu, Hongfei Duan, Chenxu Yuan, Xinyao Zhu, Zhenjie Qin, Yi Song, Yuhang Jin, Yang Zhengzhou Univ Res Ctr Grid Energy Storage & Battery Applicat Sch Elect & Informat Engn Zhengzhou 450001 Henan Peoples R China

Aqueous zinc-ion batteries are considered an ideal choice for energy storage technology in new power systems due to their high theoretical capacity, high safety, and environmental friendliness. However, in practical applications, Zn anodes face a series of problems and challenges, such as Zn dendrite irregular growth, electrode cross-section corrosion, and hydrogen reduction side reactions. This has importantly impeded the large-scale utilization of zinc-ion batteries. Therefore, it is necessary to characterize the failure mechanism of zinc-metal anodes, but the current failure mechanism of Zn anodes is not well characterized, leading to different mechanism elaborations. Although many studies have been conducted to improve the interfacial stability of Zn-metal anode interfaces, there are few systematic summaries of the key role played by in situ characterization in revealing the interfacial mechanisms of Zn-metal anodes. In this paper, the main problems and failure mechanism of zinc anode interface are discussed. Then, the application of in situ characterization technology in zinc anode interfaces and the latest research progress are summarized from different aspects. The purpose of this review is to better understand the development of zinc-ion batteries and the improvement of the stability of the Zn anode interface, thus accelerating the large-scale production of zinc batteries. Finally, the research direction of the in situ characterization of zinc anodes is summarized and suggested.

关键词： Anodes

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Wireless Power and Data Transfer System Using Multidirectional Magnetic Coupler for Swarm AUVs

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2023年第2期38卷 1440-1444页

作者： Zeng, Yingqin Lu, Conghui Liu, Renzhe He, Xiangrui Rong, Cancan Liu, Minghai Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan 430074 Peoples R China China North Vehicle Res Inst Beijing 100072 Peoples R China China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Jiangsu Peoples R China

In this letter, a simultaneous wireless power and data transfer system based on a novel multidirectional magnetic coupler is presented for the application of swarm AUVs. The transmitting coil consisting of two reversely wound helix loops can generate a multidirectional magnetic field in space, which supplies power to multiple arc-shaped receiving coils placed in different directions. Aiming at high coupling strength and low core volume, a multiobjective genetic algorithm is used to optimize coil parameters. In addition, a hybrid injection communication method based on LCC-S compensation topology is proposed and analyzed. An experiment platform is built and the results show that the system can achieve 92.25% efficiency at a power level of 200 W when four AUVs are powered. Meanwhile, the transferred data are successfully recovered at the data rate of 30 kbps.

关键词： Couplers Magnetic cores Inductance Data transfer Ferrites Magnetic fields Capacitors Autonomous underwater vehicles (AUVs) data transfer magnetic coupler multiple loads wireless power transfer (WPT)

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Criteria and Enhancement of Fast Inertial Response for DFIG-Based Wind Turbines

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2025年第5期40卷 6429-6435页

作者： Guo, Xiang Tang, Qingbo Zhu, Donghai Zhou, Yini Zou, Xudong Hu, Jiabing Kang, Yong China Univ Min & Technol Sch Elect Engn Xuzhou 221116 Peoples R China Hubei Key Lab Marine Electromagnet Detect & Contro Wuhan 430064 Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Technol Wuhan 430074 Peoples R China

Inertia control has been a mandatory requirement for wind turbines (WTs). However, existing research pays more attention to the inertia control methods, especially the power boost during the inertial response. The response speed of the inertial response is hardly discussed. Therefore, the letter makes efforts to explore the methods to evaluate and enhance the response speed for the inertial response. First, the phase motion model for doubly fed induction generator-based WTs is illustrated as the foundation of inertia analysis. On this basis, the reason for the phase diagram of the inertia transfer function can evaluate the response speed is explained, and the response speed of the inertia control in the power loop and phase-locked loop is compared. Furthermore, the underlying mechanism for enhancing the response speed is revealed and an optimized inertia control method is proposed. The proposed method significantly improves the response speed while maintaining the power boost by proper parameter design. Finally, the analysis and proposed method are validated by the experiments.

关键词： Phase locked loops Doubly fed induction generators Transfer functions Bandwidth Frequency control Dynamics Indexes electromagnetics Wind turbines Rotors Doubly fed induction generator (DFIG) fast inertial response inertia control response speed wind turbine (WT)

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Range extended SP-iToF LiDAR with time-gated and spatially fused imaging

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OPTICS EXPRESS 2024年第19期32卷 32597-32611页

作者： Zeng, Yinong Li, Chong Yi, Zihan Wang, Ziyang Hao, Huiz Qiu, Jian Liu, Kefu Chang-Hasnain, Connie J. Fudan Univ Sch Informat Sci & Engn 2005 Songhu Rd Shanghai 200433 Peoples R China Fudan Univ Acad Engn & Technol 220 Handan Rd Shanghai 200433 Peoples R China Berxel Photon Co Ltd Shenzhen 518071 Peoples R China Chinese Univ Hong Kong Shenzhen 518172 Peoples R China

Light detection and ranging (LiDAR) systems based on indirect time-of-flight (iToF)sensors have garnered considerable interest due to their all-solid-state design, high resolution,high reliability, and cost-effective nature. However, the challenge of extending the operationalrange of iToF LiDAR systems without compromising the range precision is a significant barrierto their broader application. This paper introduces what we believe to be a novel method toovercome these hurdles, which involves pre-setting the delay between the light pulse emissionand the sensor's transfer gates to extend the operational range and utilizing spatial overlapfusion techniques to enhance the range precision. In hardware, a pulsed current driver forthe light source with adjustable peak power has been developed to accommodate the varyingpower budget demands across a longer range. Experimental results demonstrate that, under thesame signal-to-noise (SNR), the proposed method exhibits enhanced performance in range errorand range precision compared to the conventional method. Furthermore, the designed LiDARachieves 3D imaging at a distance of up to 120 meters with centimeter-level precision.

关键词： Imaging techniques Lidar Phase shift Remote sensing Three dimensional imaging Vertical cavity surface emitting lasers

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