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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Xu, Mosai Liang, Lin Yan, Xiaoxue School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Engineering Research Center of Power Safety and Efficiency Ministry of Education Wuhan China

ISBN: (纸本)9798350313765

To meet the increasing demand for high switch speed of avalanche bipolar junction transistors (ABJT) and to solve the heat dissipation problem of the commonly used SOT23 packaging, an optimized packaging design for ABJT using the clip bonding is proposed. In this paper, a series of analysis is conducted based on finite element simulation to study the thermomechanical performance of the novel clip bonding packaging. A comparison of the parasitic parameters, thermal and mechanical properties between clip bonding and wire bonding packaging demonstrates that the bigger bonding area leads to lower inductances and thermal resistance, as well as better heat dissipation performance and reliability. The thickness of the copper sheet is also optimized and the reliability analysis is conducted using the Hallberg-Peck model, demonstrating that the reliability of the clip bonding packaging is superior to the conventional SOT23 packaging using wire bonding. © 2023 IEEE.

关键词： avalanche bipolar junction transistors clip bonding finite element analysis thermal resistance

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Reversible aqueous aluminum metal batteries enabled by a water-in-salt electrolyte

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Green Energy & Environment 2024年第7期9卷 1183-1191页

作者： Wenjing Tang Lijun Deng Longyuan Guo Shoubin Zhou Qinhai Jiang Jiayan Luo Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming State School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Science Harbin Institute of TechnologyShenzhenGuangdong518055China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China HuaFu High Technology Energy Storage CO. LTDYangzhou225600China Shanghai Jiao Tong University Shaoxing Research Institute of Renewable Energy and Molecular Engineering Shaoxing312000China

Aluminum(Al),the most abundant metallic element on the earth crust,has been reckoned as a promising battery material for its the highest theoretical volume capacity(8046 mAh cm^(-3)).Being rechargeable in ionic liquid electrolytes,however,the Al anode and battery case suffer from *** the other hand,Al is irreversible in aqueous electrolyte with severe hydrogen evolution ***,we demonstrate a water-in-salt aluminum ion electrolyte(WISE)based on Al and lithium salts to tackle the above *** the WISE system,water molecules can be confined within the Li^(+)solvation *** diminished Al^(3+)-H_(2)O interaction essentially eliminates the hydrolysis effect,effectively protecting Al anode from ***,long-term Al plating/stripping can be ***,two types of high-performance full batteries have been demonstrated using copper hexacyanoferrate(CuHCF,a Prussian Blue Analogues)and LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM)as *** reversibility of Al anode laid the foundation for low cost rechargeable batteries suffering for large-scale energy *** context:Al batteries are expected to become a safe and sustainable alternative to lithium *** decades,chase for a feasible Al secondary battery has not been *** key challenge is to find suitable cathode and electrolyte materials,together with which Al anode battery can function ***,fatal drawbacks have impeded the practical application of Al metal batteries(AMBs),such as sustained corrosion of Al anode and battery case in ionic liquid electrolytes,irreversibility issues as well as severe hydrogen evolution reaction during cycling in aqueous ***,electrolyte and their electrochemical kinetics play a vital role in the performance and environmental operating limitations of high-energy Al metal *** this work,we demonstrate a nearly neutral Al ion water-in-salt electrolyte(WISE)to tackle the above chal

关键词： Water-in-salt electrolyte Rechargeable aluminum anode Solvation sheath Hybrid battery Abundance

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Electronic Structure of a Co-Doped ZnO 12 30)Σ=7 Grain Boundary 3

Electronic Structure of a Co-Doped ZnO 12 30)Σ=7 Grain Bou...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Zhang, Xiaoxuan He, Junjia Song, Li Zhou, Benzheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781665477321

The electronic properties of Co-doped Σ=7[0001] grain boundaries in ZnO were investigated using first-principles calculations due to the important role of Co in ZnO varistor ceramics. Grain boundary segregation calculations show that for Σ=7 grain boundaries, the driving force of Co segregation at grain boundaries is strong, and the segregation energy of interstitial filling is lower than that of grain boundary substitution. We obtain negative segregation energies at the two grain boundary sites, indicating that Co aggregates at the grain boundaries. The analysis of the band structure, electronic density of states and plane-averaged charge density shows that the pure Σ=7 grain boundary will lead to the generation of shallow-level acceptor states due to the breaking of bonds at the grain boundary, but it will not cause nonlinear I-V characteristics. Calculations for doping Σ=7 grain boundaries show that Co produces local impurity states at the grain boundaries and acts as a donor dopant, the conduction band intersects with the Feimi level, enhancing the grain boundary conductivity. © 2022 IEEE.

关键词： Grain boundaries

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Superior stable high-voltage LiCoO_(2) enabled by modification with a layer of lithiated polyvinylidene fluoride-derived LiF

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Carbon Energy 2024年第10期6卷 28-38页

作者： Qihang Ding Zewen Jiang Kean Chen Hui Li Jingzhe Shi Xinping Ai Dingguo Xia Hubei Key Lab of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhanChina Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials College of EngineeringPeking UniversityBeijingChina State Key Laboratory of New Textile Materials&Advanced Processing Technologies Wuhan Textile UniversityWuhanChina Wuhan Britain-China School WuhanChina

High-voltage LiCoO_(2) (LCO) can deliver a high capacity and therefore significantly boost the energy density of Li-ion batteries (LIBs). However, its cyclability is still a major problem in terms of commercial applications. Herein, we propose a simple but effective method to greatly improve the high-voltage cyclability of an LCO cathode by constructing a surface LiF modification layer via pyrolysis of the lithiated polyvinylidene fluoride (Li-PVDF) coating under air atmosphere. Benefitting from the good film-forming and strong adhesion ability of Li-PVDF, the thus-obtained LiF layer is uniform, dense, and conformal;therefore, it is capable of acting as a barrier layer to effectively protect the LCO surface from direct exposure to the electrolyte, thus suppressing the interfacial side reactions and surface structure deterioration. Consequently, the high-voltage stability of the LCO electrode is significantly enhanced. Under a high charge cutoff voltage of 4.6 V, the LiF-modified LCO (LiF@LCO) cathode demonstrates a high capacity of 201 mA h g^(−1) at 0.1 C and a stable cycling performance at 0.5 C with 80.5% capacity retention after 700 cycles, outperforming the vast majority of high-voltage LCO cathodes reported so far.

关键词： cycling stability high-voltage LiCoO_(2) LiF layer lithiated polyvinylidene fluoride surface modification

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Investigation of the J-TEXT plasma events by k-means clustering algorithm

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Plasma Science and technology 2023年第8期25卷 38-43页

作者：李建超张晓卿张昱 Abba Alhaji BALA 柳惠平周帼红王能超李达陈忠勇杨州军陈志鹏董蛟龙丁永华 the J-TEXT Team Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Department of Physics Federal University DutseJigawa 720101Nigeria 不详

Various types of plasma events emerge in specific parameter ranges and exhibit similar characteristics in diagnostic signals,which can be applied to identify these events.A semisupervised machine learning algorithm,the k-means clustering algorithm,is utilized to investigate and identify plasma events in the J-TEXT *** method can cluster diverse plasma events with homogeneous features,and then these events can be identified if given few manually labeled examples based on physical understanding.A survey of clustered events reveals that the k-means algorithm can make plasma events(rotating tearing mode,sawtooth oscillations,and locked mode)gathering in Euclidean space composed of multi-dimensional diagnostic data,like soft x-ray emission intensity,edge toroidal rotation velocity,the Mirnov signal amplitude and so *** on the cluster analysis results,an approximate analytical model is proposed to rapidly identify plasma events in the J-TEXT *** cluster analysis method is conducive to data markers of massive diagnostic data.

关键词： k-means cluster analysis plasma event machine learning

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Active electronic skin:an interface towards ambient haptic feedback on physical surfaces

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npj Flexible Electronics 2024年第1期8卷 684-710页

作者： Yuan Guo Yun Wang Qianqian Tong Boxue Shan Liwen He Yuru Zhang Dangxiao Wang State Key Lab of Virtual Reality Technology and Systems BeijingChina School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Department of Strategic and Advanced Interdisciplinary Research Peng Cheng LaboratoryShenzhenChina

In the era of ubiquitous computing with flourished visual displays in our surroundings,the application of haptic feedback technology still remains in its *** the gap between haptic technology and the real world to enableambient haptic feedback on various physical surfaces is a grand challenge in the field of human-computer *** paper presents the concept of an active electronic skin,characterized by three features:richness(multi-modal haptic stimuli),interactivity(bi-directional sensing and actuation capabilities),and invisibility(transparent,ultra-thin,flexible,and stretchable).By deploying this skin on physical surfaces,dynamic and versatile multi-modal haptic display,as well as tactile sensing,can be *** potential applications of this skin include two categories:skin for the physical world(such as intelligent home,intelligent car,and intelligent museum),and skin for the digital world(such as haptic screen,wearable device,and bare-hand device).Furthermore,existing skin-based haptic display technologies including texture,thermal,and vibrotactile feedback are surveyed,as well as multidimensional tactile sensing *** analyzing the gaps between current technologies and the goal of ambient haptics,future research topics are proposed,encompassing fundamental theoretical research on the physiological and psychological perception mechanisms of human skin,spatial-temporal registration among multimodal haptic stimuli,integration between sensing and actuation,and spatial-temporal registration between visual and haptic *** concept of active electronic skin is promising for advancing the field of ambient haptics,enabling seamless integration of touch into our digital and physical surroundings.

关键词： Active ambient electronic

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Pulse Alternation Modulation for Four-Level Buck/Boost Converter with Full Voltage ZVS Range

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IEEE Transactions on Power Electronics 2025年第9期40卷 11928-11933页

作者： Zhang, Tianyi Liu, Caifeng Zou, Jiaao Zou, Xudong Kang, Yong State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

In this letter, a pulse alternation modulation (PAM) for four-level buck/boost (FLBB) converter is proposed. The inherent flaws of the existing modulations are analyzed. The low slope of the inductor current near the mode boundary and the frequency constraint result in a narrow zero-voltage switching (ZVS) range. PAM redesigns the modulation timing with fixed switching frequency to overcome the inherent flaws, therefore extending the ZVS range. An optimization method is introduced correspondingly to minimum the RMS of inductor current by optimizing phase-shift ratio. The performance of PAM is verified by experimental results. © 1986-2012 IEEE.

关键词： Switching frequency

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Dielectric–magnetic manipulation of reduced graphene oxide permittivity for enhanced electromagnetic wave absorption

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Journal of advanced Ceramics 2024年第12期13卷 1974-1984页

作者： Kaili Zhang Zhen Wang Yuefeng Yan Guansheng Ma Renchao Che Dechang Jia Xiaoxiao Huang Yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China

Graphene is a promising electromagnetic wave absorption(EMWA)material because of its structural designability,controllable electromagnetic properties,and excellent ***,the impedance mismatch caused by high conductivity and dielectric properties has seriously hindered the application of graphene in the EMWA *** this work,based on the dielectric dispersion behavior of ideal broadband absorption as a guide,a Fe microsheet/reduced graphene oxide(Fe/RGO)composite was prepared by simple hydrothermal and thermal reduction *** permittivity of RGO is optimized by adjusting the content of anisotropic Fe microsheets,and a balance between attenuation ability and impedance matching is *** calculations and off-axis electron holography results reveal that the abundant polar sites and heterogeneous interfaces of Fe and RGO enhance the dipole and interface *** threedimensional(3D)conductive network structure contributes to multiple reflections of incident electromagnetic waves and conduction *** natural and exchange resonances and eddy current loss caused by anisotropic Fe microsheets further increase magnetic *** on the dielectric-magnetic loss mechanism and good impedance matching,Fe/RGO achieves a minimum reflection loss(RL_(min))of−67.95 dB at 8.48 GHz and a maximum effective absorption bandwidth(EAB_(max))of 6.91 GHz(11.09–18 GHz)with a low filling content of 10 wt%.In addition,Fe/RGO has excellent radar stealth performance,with a radar cross section(RCS)of−31.21 dBm^(2) at 0°.Therefore,the proposed strategy and theoretical analysis provide a reference for the microstructure design,composition,and mechanism analysis of EMWA materials.

关键词： electromagnetic wave absorption(EMWA) Fe microsheets reduced graphene oxide(RGO) dielectric-magnetic loss impedance matching

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Optimization design of three-phase common box GIS double-break disconnector based on NSGA-II algorithm and improved BP neural network 9

Optimization design of three-phase common box GIS double-bre...

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9th International Conference on Energy System, Electricity, and Power, ESEP 2024

作者： Li, Jinbin Ren, Jieshuai Zhang, Hongrui Yuan, Zhao Chen, Jun Wen, Yaqin Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Elec-tronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781510691728

The GIS double-break isolator switch features design characteristics such as miniaturization and compactness. Compared to traditional isolators, it faces more stringent challenges in terms of electrical insulation, structural strength under pressure, and temperature rise performance. Therefore, optimizing core dimension parameters within limited space to enhance its insulation, pressure resistance, and temperature rise performance is of great significance. To this end, finite element methods were employed to establish simulation models for the GIS electrostatic field, stress field, and temperature field, which were subsequently analyzed to identify key optimization locations and dimensional parameters. In order to handle the large computational load involved in the optimization of the field models, while balancing both solution accuracy and computational efficiency, a Box-Behnken experimental design strategy was used for data sample collection, and a GA-BP neural network model was developed. By integrating the neural network model with the NSGA-II algorithm, a global optimal solution set and the corresponding optimal values were identified under multi-objective conditions. After optimization of the core dimension parameters of the isolator switch, the field distributions at critical locations were significantly improved, resulting in a notable enhancement in the overall performance of the double-break isolator switch. © 2025 SPIE.

关键词： Electric insulation

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On the chronological understanding of the homogeneous dielectric barrier discharge

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High Voltage 2023年第6期8卷 1132-1150页

作者： Xinpei Lu Zhi Fang Dong Dai Tao Shao Feng Liu Cheng Zhang Dawei Liu Lanlan Nie Chunqi Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina College of Electrical Engineering and Control Science Nanjing Tech TechnologyNanjingChina School of Electric Power South China University of TechnologyGuangzhouChina Institute of Electrical Engineering Chinese Academy of SciencesBeijingChina Frank Reidy Research Center for Bioelectrics Old Dominion UniversityNorfolkVirginiaUSA Department of Electrical and Computer Engineering Old Dominion UniversityNorfolkVirginiaUSA

Dielectric barrier discharges(DBD)are widely utilised non‐equilibrium atmospheric pressure plasmas with a diverse range of applications,such as material processing,surface treatment,light sources,pollution control,and *** the course of several decades,extensive research has been dedicated to the generation of homogeneous DBD(H‐DBD),focussing on understanding the transition from H‐DBD to filamentary DBD and exploring strategies to create and sustain H‐*** paper first discusses the in-fluence of various parameters on DBD,including gas flow,dielectric material,surface conductivity,and mesh ***,a chronological literature review is presented,highlighting the development of H‐DBD and the associated understanding of its un-derlying *** encompasses the generation of H‐DBD in helium,nitrogen,and ***,the paper provides a brief overview of multiple‐current‐pulse(MCP)behaviours in H‐*** objective of this article is to provide a chronological un-derstanding of homogeneous dielectric barrier discharge(DBD).This understanding will aid in the design of new experiments aimed at better comprehending the mechanisms behind H‐DBD generation and ultimately assist in achieving large‐volume H‐DBD in an air environment.

关键词： dielectric barrier pollution

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