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Failure Mechanism Analysis on Single Pulse Avalanche for SiC MOSFETs 1

Conference Proceedings of 2022 2nd International Joint Conference on Energy, Electrical and Power engineering

作者： Fei, Haoyang Liang, Lin Zhang, Ziyang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789819943340

ISBN: (纸本)9789819943333

The avalanche failure mechanism of 1200 V 40-mΩ planar silicon carbide (SiC) metal-oxide-semiconductor-field-effect transistor (MOSFET) is investigated in this article. Unclamped inductive switching (UIS) test is performed and the junction temperature is extracted by an accurate model to illustrate the relationship between failure temperature and avalanche current. The failure temperature shows little dependence on current and a critical temperature window around 980 K ~ 1100 K is found. The probability of the latch-up of parasitic bipolar junction transistor (BJT) and metal system damage is studied by an analytical model and the thermal diffusion equation. With further theoretical analysis and validation, the failure mechanism is demonstrated as the metal system damage because the high-temperature transition exceeds the sustainable time of SiC MOSFETs. TCAD simulation is also used to verify this mechanism and the temperature evolution suggests that aluminum is likely to melt during the avalanche. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Silicon carbide

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A Review on the Control Strategies for Differential Boost Inverter 26

A Review on the Control Strategies for Differential Boost In...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Li, Mengyuan Wang, Jin Wang, Hu Dai, Youlun Zhou, Libing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

The differential boost inverter (DBI) has gained a great deal of interest in academia due to its advantages. Compared with conventional cascaded topology composed of a DC-DC boost circuit and a voltage source inverter, DBI needs only one-level topology to achieve boost inverter, thus has higher efficiency and lower cost. The three-phase DBI can be applied to motor drives and grid connection. Based on analyzing the structure and operating principle of three-phase DBI, this paper presents an elaborate and in-depth review of typical control strategies for three-phase DBI, including their basic principles, key features, exiting issues, and relevant suggestions, and finally reports the development tendency of the control strategies. © 2023 IEEE.

关键词： Topology

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The state-of-the-art of atmospheric pressure plasma for transdermal drug delivery

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Plasma Science and technology 2024年第4期26卷 9-26页

作者：聂兰兰刘大伟程鹤赵峰卢新培 State key laboratory of advanced electromagnetic engineering and technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094People’s Republic of China Department of Thoracic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022People’s Republic of China

Plasma-enhanced transdermal drug delivery(TDD) presents advantages over traditional methods,including painless application, minimal skin damage, and rapid recovery of permeability. To harness its clinical potential, factors related to plasma’s unique properties, such as reactive species and electric fields, must be carefully *** review provides a concise summary of conventional TDD methods and subsequently offers a comprehensive examination of the current state-of-the-art in plasma-enhanced TDD. This includes an analysis of the impact of plasma on HaCaT human keratinocyte cells, ex vivo/in vivo studies, and clinical research on plasma-assisted TDD. Moreover, the review explores the effects of plasma on skin physical characteristics such as microhole formation, transepidermal water loss(TEWL), molecular structure of the stratum corneum(SC), and skin resistance. Additionally, it discusses the involvement of various reactive agents in plasma-enhanced TDD, encompassing electric fields,charged particles, UV/VUV radiation, heat, and reactive species. Lastly, the review briefly addresses the temporal behavior of the skin after plasma treatment, safety considerations, and potential risks associated with plasma-enhanced TDD.

关键词： plasma transdermal drug delivery skin physical characteristics reactive agents

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Comparative Stability Study of Grid-Following and Grid-Forming Converters in Current Control Timescale 5

Comparative Stability Study of Grid-Following and Grid-Formi...

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5th International Conference on Electrical engineering and Control Technologies, CEECT 2023

作者： Zhou, Yunpeng He, Wei Hu, Jiabing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350342253

Oscillations in current control (CC) timescale caused by the large-scale integration of voltage-source converters (VSCs) have gained more and more attention from both academy and industry. In view of this problem, a comparative study is conducted to investigate the stability difference between gridfollowing (GFL) and grid-forming (GFM) converters in CC timescale. Firstly, the unified linearized model of GFL and GFM converters is established. Secondly, the impact paths of other control loops on the current control loop are extracted based on the proposed model. Thirdly, the characteristics of the corresponding paths in GFL and GFM converter are studied. By comparing the impact of the corresponding paths on the current control loop, the root cause of the stability difference between GFL and GFM in CC timescale is revealed. All results are verified through time-domain simulations. © 2023 IEEE.

关键词： Stability

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Anion-Regulated Weakly Solvating Electrolytes for High-Voltage Lithium Metal Batteries

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Energy & Environmental Materials 2023年第6期6卷 259-265页

作者： Zhipeng Jiang Jisheng Mo Chen Li Haiwen Li Qingan Zhang Ziqi Zeng Jia Xie Yongtao Li School of Materials Science and Engineering&Low-Carbon New Materials Research Center Anhui University of TechnologyMaanshan 243002China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education Anhui University of TechnologyMaanshan 243002China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hefei General Machinery Research Institute Hefei 230031China

Development of advanced high-voltage electrolytes is key to achieving high-energy-density lithium metal batteries(LMBs).Weakly solvating electrolytes(WSE)can produce unique anion-driven interphasial chemistry via altering the solvating power of the solvent,but it is difficult to dissolve the majority of Li salts and fail to cycle at a cut-off voltage above 4.5 ***,we present a new-type WSE that is regulated by the anion rather than the solvent,and the first realize stable cycling of dimethoxyethane(DME)at 4.6 V without the use of the“solvent-in-salt”*** relationships between the degree of dissociation of salts,the solvation structure of electrolytes,and the electrochemical performance of LMBs were systematically *** found that LiBF_(4),which has the lowest degree of dissociation,can construct an anion-rich inner solvation shell,resulting in anion-derived anode/cathode *** to such unusual solvation structure and interphasial chemistry,the Li-LiCoO_(2)full cell with LiBF_(4)-based WSE could deliver excellent rate performance(115 mAh g^(-1)at 10 C)and outstanding cycling stability even under practical conditions,including high loading(10.7 mg cm^(-2)),thin Li(50μm),and limited electrolyte(1.2μL mg^(-1)).

关键词： high-voltage LiCoO_(2) lithium metal batteries solvation structure weakly solvating electrolyte

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Nonlinear Multiscale Modeling of Multi-Machine Power Systems Integrated with Photovoltaics

Nonlinear Multiscale Modeling of Multi-Machine Power Systems...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Wu, Jiaqi Han, Miao Zhan, Meng Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

Large-scale photovoltaics (PVs) connected to the power grid through power electronic equipment have greatly changed the dynamics of the traditional power systems dominated by synchronous generators (SGs), bringing significant challenges to modeling and analysis of modern power systems. In this paper, a nonlinear model of multi-machine power systems integrated with PVs is established to reveal the multi-timescale transient synchronization characteristics using the singular perturbation technique. The fast subsystem containing the dynamics of the DC voltage control, terminal voltage control, and phase-locked loop, and the slow subsystem containing the dynamics of the rotor swing can effectively reflect the dynamics of multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, respectively. The proposed model provides a clearer physical picture of dynamics in the multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, and serves as the foundational model for further stability analysis. Finally, simulation results verify the validity of the proposed model. © 2023 IEEE.

关键词： Dynamics

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A Novel Variable Impedance Design Concept of PM Fault Tolerant Machine 26

A Novel Variable Impedance Design Concept of PM Fault Tolera...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Wang, Runyu Li, Dawei Fan, Xinggang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

A novel variable impedance fault tolerant design concept is proposed in this paper for high reliable PM machines. The special fault tolerant ring structure realizes the automatic transformation of the machine from low impedance in healthy operation to ultra-high impedance in fault operation, which effectively suppresses the short-circuit current. First, the design guidelines for fault tolerant ring and the fault tolerance mechanism of variable impedance are introduced. Subsequently, two variable impedance machine topologies with separated and integrated fault tolerant rings are investigated. Finally, the prototypes are fabricated and the experimental results show that the proposed variable impedance topology has a turn-to-turn short-circuit current suppression capability that far exceeds that of the conventional fault tolerant topology. © 2023 IEEE.

关键词： Topology

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Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

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Plasma Science and technology 2023年第6期25卷 52-64页

作者：黄仕杰刘毅赵勇徐尤来林福昌李化张钦李柳霞 School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Key Laboratory of Pulsed Power Technology(Huazhong University of Science and Technology) Ministry of EducationWuhan 430074People's Republic of China

High-voltage pulse discharge(HVPD)rock fragmentation controls a plasma channel forming inside the rock by adjusting the electrical parameters,electrode type,*** this work,an HVPD rock fragmentation test platform was built and the test waveforms were *** the effects of temperature,channel expansion and electromagnetic radiation,the impedance model of the plasma channel in the rock was *** parameters and initial values of the model were determined by an iterative computational *** model calculation results can reasonably characterize the development of the plasma channel in the rock and estimate the shock wave *** on the plasma channel impedance model,the temporal and spatial distribution characteristics of the radial stress and tangential stress in the rock were calculated,and the rock fragmentation effect of the HVPD was analyzed.

关键词： stress wave shock wave plasma channel impedance model rock fragmentation high-voltage pulse discharge

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Efficiency Estimates of Integrated Two-Speed e-Powertrain System under WLTP Driving Cycle for Electric Vehicle 26

Efficiency Estimates of Integrated Two-Speed e-Powertrain Sy...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Feng, Shun Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

Efficiency is always one of key metrics for electric powertrain system to make the most of battery stored energy and boost electric vehicle's range. This paper presents a systematic method to estimate efficiency capability for an integrated two-speed e-Powertrain system. Overall system is modelled in MATLAB/Simulink. Inverter power, voltage and current requirements are defined from system specifications. Inverter losses, efficiencies and thermal conditions are investigated at switching frequencies of SkHz and 12kHz. With both traction motor and gearbox efficiency maps, 93.2% system peak efficiency and 90.2% Worldwide Harmonized Light Vehicle Test Procedure (WLTP) Class 3b driving cycle efficiency are obtained to verify that design targets are met in simulations. A prototype is built to validate system efficiency performance in the thermal chamber during tests. © 2023 IEEE.

关键词： Traction motors

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Manipulating Interfacial Stability via Preferential Absorption for Highly Stable and Safe 4.6 V LiCoO_(2) Cathode

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Nano-Micro Letters 2025年第8期17卷 95-110页

作者： Long Chen Xin He Yiqing Chen Youmin Hou Yujie Zhang Kangli Wang Xinping Ai Yuliang Cao Zhongxue Chen Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072People’s Republic of China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072People’s Republic of China

Elevating the upper cutoff voltage to 4.6 V could effec-tively increase the reversible capacity ofLiCoO_(2)(LCO)cathode,whereas the irreversible structural transition,unstable electrode/electrolyte interface and potentially induced safety hazards severely hinder its industrial *** a robust cathode/electrolyte interface film by electrolyte engineer-ing is one of the efficient approaches to boost the performance of high-voltage LCO(HV-LCO);however,the elusive interfacial chemistry poses substantial challenges to the rational design of highly compatible ***,we propose a novel electrolyte design strategy and screen proper solvents based on two factors:highest occupied molecular orbital energy level and LCO absorption ***(2,2,2-trifluoroethyl)phosphate is determined as the optimal solvent,whose low defluorination energy barrier significantly promotes the construction of LiF-rich cathode/electrolyte interface layer on the surface of LCO,thereby eventually suppresses the phase transition and enhancesLi+diffusion *** rationally designed electrolyte endows graphite||HV-LCO pouch cells with long cycle life(85.3%capacity retention after 700 cycles),wide-temperature adaptability(-60–80℃)and high safety(pass nail penetration).This work provides new insights into the electrolyte screening and rational design to constructing stable interface for high-energy lithium-ion batteries.

关键词： Electrolyte design LiF-rich interface Wide-temperature High-safe 4.6 V LCO

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