Framework and Research Methodology of Short-Timescale Pulsed Power Phenomena in High-Voltage and High-Power Converters

Various short-timescale transients exist in power electronic converters, particularly in high-voltage and high-power systems. The timescales of these transients are from nanoseconds to microseconds, including a switching transition of power semiconductor devices, commutating processes, and drive signal transmissions. These transient processes directly affect the performance and reliability of power electronic systems. Therefore, it is necessary to study these short-timescale processes. Based on two high-power prototype power converters, a 6000-V/1250-kW three-level adjustable-speed drive and a 10-kW/600-V dc–dc converter, this paper studies the various abnormal behaviors of the converters that occurred during the operation of these converters. Dead bands and accumulated switching errors are also investigated. A combined microscopic pulsed power and macroscopic control strategy was proposed for the design of power electronic converters. Three new concepts for power electronic converters are introduced and validated in this paper: 1) sneak pulse; 2) energy dead band; and 3) transient commutating topology.      

电力电子的应用领域与系统集成

本文阐述电力电子的应用领域和未来电力电子系统的预研课题：Ⅰ.工业系统集成 Ⅱ.汽车的机械电子集成和 Ⅲ.高频电力电子。     

浅析煤矿井下便携式电子设备设计要点

随着我国工业水平的发展,煤矿是我国主要能源需求量也在逐年上升,因此煤矿产业对于各类便携电子产品的需求量也在增多,这类电子产品的唯一充电源为于便携式电源,所以,这类便携式电源的设计应该要考虑多方面的因素,比如怎样才能减少电子产品充电时间,提高电源的利用,怎样利用最新的技术将电源的体积缩得更小,使其更加便于携带等.本文主要针对煤矿产业中,便携式电子电源的设计的主要的技术要点进行探究,以便使该电源在矿井中应用更广.     

Improved Millimeter Wave Noise Source on BWO

The operation peculiarities and performance of new millimetric noise source on BWO are described. To increase the interaction efficiency and to extend the operation frequency band the modified vane-type slow-wave structure is proposed to use. Packaged K _a-band source provides noise with power spectrum width controlled within 10 - 300 MHz, electronic tunability of the frequency of 10-12% and has the output power up to 18W and electronic efficiency of 5.5%. Electronic tuning of noise frequency has a discontinuities, but the operation frequency band is almost fully covered. To have a possibility to tune the noise power spectrum maximum to the desired frequency both the electronic tuning and mechanical one can be used. Application of the magnet system with focusing magnetic field magnitude up to 4300 G allows to increase output power level and electronic efficiency up to 32 W and 7% respectively.     

矿用直流电源纹波测量问题探讨

所有电子产品都需要电源提供能量,而电源纹波是电源的一项重要指标。纹波电压会对电子电路产生影响,尤其是通信产品。文中主要介绍纹波电压的产生及测量纹波电压的方法。     

基于Multisim技术的电力电子电路的优化设计研究

科学技术水平的提高,使诸多电力电子设备被应用于各个领域当中,极大推动了各个领域的发展.由于电力电子电路的设计非常复杂,设计周期往往较长,对电力电子电路的参数修改较为麻烦等缺陷,致使电力电子电路的设计产品在精度与可靠性方面受到很大影响.对电力电子电路的I波形与V波形进行波形分析,能够为电力电子电路的优化设计提供科学的指导,但由于其I波形与V波形较为复杂,这使波形分析面临着很大的困难.因此必须采取相应的措施来予以改进,而Multisim技术的出现为电力电子电路的优化设计提供了全新的方向.为此,本文便基于Multisim技术对电力电子电路的相关优化设计方法进行深入的研究与探讨.     

电力变换和控制技术导论

电力的开发和应用是现代社会经济发展和人类高质量生活条件的基础,经过变换处理后再供用户使用的电能占全国总发电量的百分比值的高低是衡量一个国家技术进步的主要标志之一。文章阐述了开关型电力电子变换和控制基本原理,介绍了实用的半导体电力开关器件、电力电子开关型电源及电力电子补偿控制器的应用,最后,总结了电力电子技术的发展历史和今年十年电力电子技术变革。     

电子控制中电力电子技术的应用

电力电子技术的合理使用,不仅能提升相关设备的运行质量,而且对于提升设备的运行效率也有着十分积极的现实意义,可最大限度地提升企业经济效益。因此,针对电子控制中电力电子技术应用的现实意义和范围进行具体研究,以期有效地提升电子控制中电力电子技术的应用质量。     

新型功率MOS器件的结构与性能特点

电力电子器件的结构决定其性能,而器件的性能又决定电路的性能。根据此原理,分析比较了近十年来10种实用的具有新结构的功率MOS器件的结构与性能特点。     

单相电子式预付费电度表的实验研究

基于单片机AT89C52对单相电子式预付费电度表系统进行了系统的设计,AT89C52单片机为控制核心,预付费电度表的硬件电路包括电能计量电路、控制电路、显示电路、IC卡接口、电能存储器、掉电检测和电源几大模块等组成。电能计量系统是完成电能测量、电能值显示、超负荷断电等功能;预付费系统主要是利用IC卡实现先付费,再用电。前者主要追求可靠性,后者要求安全性高。该系统经过实验,安全可靠,功耗小,成本低,符合设计要求。     

浅谈现代电力电子器件的发展

本文简单回顾了电力电子技术及电力电子器件的发展过程，介绍了IGBT、IGCT等主流现代电力电子器件的工作原理、现状和发展动态。最后，探讨了现代电力电子器件的发展展望。     

SiC电力电子器件对电力系统的影响

宽禁带SiC材料被认为是高性能电力电子器件的理想材料,比较了Si和SiC材料的电力电子器件在击穿电场强度、稳定性和开关速度等方面的区别,着重分析了以SiC器件为功率开关的电力电子装置对电力系统中柔性交流输电系统(FACTS)、高压直流输电(HVDC)装置、新能源技术和微电网技术领域的影响。分析表明,SiC电力电子器件具有耐高压、耐高温、开关频率高、损耗小、动态性能优良等特点,在较高电压等级(高于3 kV)或对电力电子装置性能有更高要求的场合,具有良好的应用前景。     

Electronic prognostics for switched mode power supplies

Switching power supplies have become ubiquitous in electronic modules and systems. From converting power types, power levels, or driving actuators, these power converters embody varying topologies but usually have high switching rates of up to 500 KHz, power devices such as MOSFETs, microelectronic components and a mix of passive components that store and release energy. They are complex modules that have an unfortunate history of observed high failure rates, yet they may be required to support critical systems.Electronic prognostics/health management, or ePHM, provides the ability to predict the failure of the electronic before it actually occurs. This paper will examine the considerations associated with key system- and device level prognostics that designers need to evaluate when “PHM-enabling” their power system.     

电子信息技术在电力自动化系统中的应用

电子信息技术的迅速发展为电力自动化系统的应用提供了广阔的空间，电子信息技术是电力自动化的关键，可以帮助电力系统实现智能化的运作。若想提升电力自动化系统的性能，就需要引进先进的电子信息技术，提高电力系统的安全性和稳定性，并利用电子信息技术对电力系统进行监管，通过实时监测和数据分析，监管部门可以更好地掌握电力系统的运行情况，及时发现问题，并采取措施对其进行调整和优化。文中简要介绍了电子信息技术在电力系统中的应用，对电力行业的进一步发展具有一定的参考价值。     

电子信息技术在电力自动化的应用分析

本文围绕着电子信息技术在电力自动化的应用展开了讨论,首先阐述了电子信息技术在电力自动化中的应用,随后分析了电力自动化系统中电子信息技术的应用前景.随着科学技术的发展,电子信息技术也在不断发展,其被应用到许多领域之中,其中就包括电子自动化领域.电子信息技术在今后不断发展的过程中,其应用范围和前景也会越来越广.     

电磁仿真技术在电源设计中的应用

基于增强电子设备的电源设计能力,拓展电源设计手段及方法,提高电子设备电磁兼容性能的目的,在电子设备的电源设计及系统供电设计过程中采用电磁仿真技术,搭建虚拟设计验证平台,按照GJB151A-1997的标准要求,通过了国军标电磁兼容试验室测试验证,证明在电源设计中引入电磁仿真技术,采用规范法和系统法,能有效降低电子设备后期电磁兼容性能试验成本,增强整机电源设计能力,提高电子设备电磁兼容性能,并对电源设计存在的弊端进行了分析,同时阐述了电磁仿真技术的功能和作用。     

A Review of the State of the Art of Power Electronics for Wind Turbines

This paper reviews the power electronic applications for wind energy systems. Various wind turbine systems with different generators and power electronic converters are described, and different technical features are compared. The electrical topologies of wind farms with different wind turbines are summarized and the possible uses of power electronic converters with wind farms are shown. Finally, the possible methods of using the power electronic technology for improving wind turbine performance in power systems to meet the main grid connection requirements are discussed.      

探究电力电子器件及其应用的现状和发展

电力电子器件随着我国经济的发展与社会的进步已经在众多领域中进行了应用.本文主要就电力电子器件应用的现状、应用中存在的问题、未来发展的趋势三个方面的内容进行论述.     

Design of multiple-input power converter for hybrid vehicles

This paper deals with designing and sizing of a multiple-input power electronic converter (MIPEC) to be used in an electric vehicle propulsion system that includes a fuel cell (FC) generator and a combined storage unit. The combined storage unit is composed by an ultracapacitors tank (UC) and a battery unit (BU). MIPEC is responsible for power-flow management on-board the vehicle for each mode of operation. Specifications for MIPEC designing come out from many considerations concerning traction drive and reference driving cycle, on-board power source and storage unit characteristics. However, to date sizing and configuration of both storage units and on-board generators are directly related to traction drive and driving profile (i.e., vehicle performances and characteristics) and no relation with power electronic interface is considered during preliminary design. Then, power electronic interface is selected in order to fit traction drive requirements with power source and storage unit characteristics; as a consequence converter mode of operation lacks of optimization, as well dynamic behavior and efficiency cannot be maximized. In this paper, MIPEC design and power source and storage unit selection are achieved at the same project stage according to traction drive requirements. Experimental results on 60-kW power electronic interface are presented.     

A Low Power Analog CMOS Vision Chip for Edge Detection Using Electronic Switches

An analog CMOS vision chip for edge detection with power consumption below 20 mW was designed by adopting electronic switches. An electronic switch separates the edge detection circuit into two parts: one is a logarithmic compression photocircuit, and the other is a signal processing circuit for edge detection. The electronic switch controls the connection between the two circuits. When the electronic switch is off, it can intercept the current flow through the signal processing circuit and restrict the magnitude of the current flow below several hundred nA. The estimated power consumption of the chip, with 128 × 128 pixels, was below 20 mW. The vision chip was designed using 0.25 µm 1‐poly 5‐metal standard full custom CMOS process technology.