共查询到19条相似文献,搜索用时 351 毫秒
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<正>2010年4月13日,专业设计和制造固态高功率宽带放大器的MILMEGA公司于2010年亚太区电磁兼容(APEMC)国际学术大会及展览会期间宣布推出一款新的放大器产品。该款产品主要针对商用EMC测试IEC61000-4-3标准(覆盖频率 相似文献
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广州致远电子有限公司 《单片机与嵌入式系统应用》2008,(12)
EPCS-8200是广州致远电子有限公司开发的基于XS-cale处理器,支持高分辨率显示的工控机主板。该主板具有高分辨率的显示、较强的多媒体功能、低功耗、高可靠性等特点,预装正版Microsoft Windows CE5.0或MontaVistaLinux嵌入式操作系统,并提供所有板载外设驱动库。EPCS-8200带有专用的显卡芯片,支持的分辨率可达1024×768,在多媒体处理能力方面比较有优势;另外,还带有Video视频接口(支持PAL制式视频输入)和5个串口。可以在工业温度范围内稳定工作,特别适合工业控制、视频监视、远程监控、现场通信等领域的应用。产品可靠性◆工业级环境温度:-40~+85℃;◆ESD(静电放电)保护:IEC61000-4-2Level4(接触放电8kV,空气放电15kV);◆Electrical fast transient/burst i mmunity(EFT快速群脉冲)保护:IEC61000-4-4Level4;◆电源端口:4kV、5/100kHz群脉冲保护;◆Vibration Amplitudes(振动)保护:IEC60068-2-6(4.5mm、30Hz、10min)集成可... 相似文献
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为了使AC/DC电源在满足IEC61000-3-2谐波标准的同时能够实现低成本、高性能,对单级功率因数校正技术(PFC)的需求越来越紧迫,特别是小功率场合。本文按照不同划分原则对PFC技术分类讨论,指出单级PFC技术适用于小功率场合,是PFC技术在小功率应用中发展的必然趋势,同时也是目前PFC技术研究热点。选择临界导电模式(CRM),利用意法半导体(SGS-THOMSON)公司推出的功率因数控制芯片L6562设计一款性价比高的PFC线路,结果表明该电源系统的功率因数提高到0.98以上,总谐波含量低于2.5%,符合IEC61000-3-2谐波电流限制标准. 相似文献
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针对基于低功率PIC16F887单片机控制系统的电磁干扰问题,设计了一种稳定的电容降压电源电路.通过电快速瞬变脉冲群(EFT/B)试验,测试了PIC16F887单片机在不同电源等级中的抗电磁干扰能力,提出了采用两级稳压电路增强电源端抗干扰能力的方法并设计了电路.实验结果表明,低功率PIC16F887单片机控制系统在电容降压电路中能稳定工作,5V系统中的EFT/B抗干扰能力要强于3.3V系统,电源端抗EFT干扰能力达到IEC61000-4-4严酷等级第4级的要求. 相似文献
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IEC 60870系列标准在我国已广泛应用,为了满足对一致性测试的要求,IEC 60870-5-6和IEC 61850第10部分:一致性测试两个关于变电站通信协议一致性标准正式颁布。本系统就是基于一致性测试标准,设计并实现了用于一致性测试的系统工具,介绍了它的动态模型、软件结构和测试环境。该系统可以进行自动协议判断、自动译码和最大限度的自动完成一致性测试。 相似文献
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《Simulation Modelling Practice and Theory》2007,15(9):1089-1102
An artificial neural network (ANN) model and more specifically a feedforward multilayer network, which uses the powerful backpropagation learning rule, is addressed in order to estimate the electric and magnetic field radiating by electrostatic discharges (ESDs). Plenty of actual measurements, carried out in the High Voltage Laboratory of the National Technical University of Athens are used in training, validation and testing processes. The developed ANN can be a necessary tool for laboratories involved in ESD tests, either facing a lack of suitable measuring equipment or for laboratories which want to compare their own measurements. This is extremely useful for the laboratories involved in the ESD tests according to the current IEC Standard [International Standard IEC 61000-4-2: Electromagnetic Compatibility (EMC), Part 4: Testing and measurement techniques, Section 2: Electrostatic discharge immunity test, Basic EMC Publication, 1995.], since the forthcoming revised version of this Standard will almost certainly include measurements of the radiating electromagnetic field during the verification of the ESD generators. The authors believe that the proposed ANN will be extensively used, since the produced electromagnetic field radiating by electrostatic discharges, can be calculated very easily and accurately by simply measuring the discharge current. 相似文献
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基于ESD保护的原理及TVS二极管的特性,设计了一种计算机串行接口的专用保护电路,并对电路板的PCB布线及器件的布置提出了一些原则要求,最后对此接口电路进行静电放电抗扰度试验。结果表明该保护电路具有一定的抗接触放电及空间放电能力,满足IEC61000-4-2标准的要求,此串行接口具有热插拔功能。 相似文献
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介绍了嵌入式TCP/IP协议LwIP、IEC 61131-3国际标准,设计了基于AT91M55800A微处理器和IEC 61131-3标准的嵌入式实时控制系统,并实现了对三溶液位的控制。 相似文献
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首先介绍ARM控制系统的组成,并简略介绍控制器所用到的MODBUS通信协议、IEC61131-3标准和ARM微处理器,然后结合实际工程,对过程映像进行介绍,详细描述在ADS编程环境下实现设备地址、功能代码、数据以及CRC校验的分配过程,并利用MODBUS通信协议实现组态软件对基于IEC 61131-3标准的ARM控制器的监测和控制. 相似文献
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依据CNAS-CL01:2006《检测和校准实验室能力认可准则》(IS0/IEC17025:2005),实验室仪器设备是准则所要求的重要内容之一,是实验室检测/校准活动最直接的手段和工具,是实验室至关重要的资源,是实验室技术能力的重要组成部分,是实验室实现质量方针和质量目标的最基本条件之一. 相似文献
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For 5-axis ball-end machining, it is desired to maintain the expected cutting performance of tool orientation when adjusting tool orientation for improving the motions of rotary axes of 5-axis machine. For this purpose, a cutting performance maintained (CPM) method is proposed to adjust the tool orientations, the objective of which is to minimize the sum of the absolute deviations between the initial and adjusted coordinates of the rotary axes while improving the kinematics performance of the rotary axes and ensuring no machining interferences. In order to speed up the solving of the optimization objective, the analytical linear representations for the drive limits of rotary axes and especially irregular geometry feasible domains (GFDs) of tool orientations are first discussed in detail. The nonlinearity of the objective function is then eliminated by introducing two new auxiliary variables for further simplifying the computation of optimal tool orientation. After rewriting the drive limits and GFD constraints with the two auxiliary variables, the linear objective function can be efficiently solved by the simple linear programming method. The tool orientations adjusted by the proposed CPM method can not only improve the interference-free motions of the rotary axes, but also can maintain the expected cutting performance. Finally, the computer simulation and real milling were conducted to validate the proposed method. 相似文献
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The Software Engineering Glossary department was started in 2003 to replace the outdated IEEE Standard 610.12-1990. Since then, the ISO/IEC JTC1/SC7 Working Group on Vocabulary has assumed the role of developing and distributing software engineering vocabulary standards. In the final installment of the department, Annette D. Reilly describes the new standards effort as a bridge between the past and the future in software engineering glossaries. 相似文献