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Effect of power line filter on MOV clamping voltage 电力线滤波器对MOV箝位电压的影响
M. Sudheer, M. Gunasekaran
Metal oxide varistors (MOV) are popularly used to protect offline electronic equipment against power line transients. The offline switched mode power supplies (SMPS) use power line filters and MOVs in the front-end. The power line filter is used to reduce the conducted noise emission into the power line and the MOVs connected before this line filter and the MOVs connected before this line filter to clamp line transients to safer levels thereby protecting the SMPS. Because of the presence of 'X' capacitors at the input of line filter the MOV clamping voltage is increased. This paper presents one such case and gives theoretical and experimental results. An approximate method to predetermine the magnitude of such clamping voltages is also presented.
金属氧化物压敏电阻(MOV)广泛用于保护离线电子设备免受电力线瞬变的影响。SMPS (offline switched mode power supply)前端采用电源线滤波器和MOVs。电力线滤波器用于减少传导噪声发射到电力线和连接在该线路滤波器之前的MOVs,以及连接在该线路滤波器之前的MOVs,以将线路瞬态箝位到更安全的水平,从而保护SMPS。由于在线滤波器的输入端存在“X”电容,MOV箝位电压增加。本文给出了一个实例,并给出了理论和实验结果。还提出了一种近似的方法来预先确定这种箝位电压的大小。
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引用次数: 1
EMI reduction in a broadband LOS link at millimeterwave by spread spectrum technique 利用扩频技术降低毫米波宽带LOS链路中的电磁干扰
A. K. Sen, R. Bera
This paper is based on broadband direct sequence spread spectrum (DS-SS) technology. Such a system will be very useful for information technology and networking for establishing the 'Global Village' in the 21st century. The use of millimeter waves allows very broadband multimedia communication required for very high speed information transfer with high reliability; such a system will be an attractive solution for defence and police wireless communications, cellular phones, the Internet and satellite communications due to its inherent EMI rejection capability. The above features will be implemented in a millimeter wave line of sight (LOS) link at 30 GHz with a multimedia communication facility to be operated between the Centenary Building of Calcutta University and Sisisr Mitra Bhaban of the Institute of Radiophysics and Electronics, over a line of sight distance of 1 km. The distance may also be increased up to 10 km if necessary, with a higher transmitter power at 30 GHz.
本文基于宽带直接序列扩频(DS-SS)技术。这样的系统将对建立21世纪的“地球村”的信息技术和网络非常有用。使用毫米波可以实现非常宽带的多媒体通信,从而实现非常高速、高可靠性的信息传输;由于其固有的电磁干扰抑制能力,这种系统将成为国防和警察无线通信、蜂窝电话、互联网和卫星通信的一种有吸引力的解决方案。上述功能将在30 GHz的毫米波瞄准线(LOS)链路中实现,多媒体通信设施将在加尔各答大学百年纪念大楼和辐射物理与电子研究所的Sisisr Mitra Bhaban之间运行,瞄准线距离为1公里。如果有必要,距离也可以增加到10公里,使用更高的30 GHz发射机功率。
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引用次数: 0
Cost considerations in EMC design methodology EMC设计方法中的成本考虑
O. Hartal
EMC design methodology for electronic equipment is examined from the cost-effective aspect. Different engineering solutions are evaluated in light of their cost versus their efficiency in providing EMI suppression for emission and immunity. As cost is a critical factor in the consumer market, the dB per dollar (dB/$) value of an EMI control must be taken into consideration in the EMC design methodology. A number of practical examples are given as an illustration.
从成本效益的角度考察了电子设备的电磁兼容设计方法。不同的工程解决方案根据其成本与提供电磁干扰抑制发射和抗扰度的效率进行评估。由于成本是消费市场的一个关键因素,因此在EMC设计方法中必须考虑EMI控制器的每美元分贝(dB/$)值。给出了一些实际的例子作为说明。
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引用次数: 0
Nontraditional methods for solving EMI problems 解决电磁干扰问题的非传统方法
G. S. Mani
In this paper an attempt has been made on how some of the modern techniques of engineering design can be useful in modeling, prediction and analysis in EMI related aspects. The techniques covered in the paper include genetic algorithms, simulated annealing, artificial neural networks and fractal modeling. The paper is divided into two parts. The first part presents an outline of the methodologies of the techniques. The explanation has been kept brief. The second part discusses usage of the above techniques in certain specific areas related to EMI/EMC.
本文尝试了一些现代工程设计技术如何在电磁干扰相关方面的建模、预测和分析中发挥作用。本文涉及的技术包括遗传算法、模拟退火、人工神经网络和分形建模。本文分为两部分。第一部分概述了这些技术的方法。解释得很简短。第二部分讨论了上述技术在与EMI/EMC相关的某些特定领域中的使用。
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引用次数: 0
Ultra wide band (UWB) systems and their implications to electromagnetic environment 超宽带系统及其对电磁环境的影响
D. C. Pande
Ultra Wide Band (UWB) systems have received considerable interest in recent years as a system that might offer technical improvements in conventional electronic systems. Defence applications of UWB signals include communication radar, electronic intelligence and electronic warfare. Defence radio and radar systems will require signals free from interception exploitation and interference. The electronic warfare sequence of measures, countermeasures, counter-countermeasures leads to use of spread spectrum (SS), wide band (WB) and ultra wide band (UWB) signal waveforms. Availability of UWB systems with their subtle characteristics enhances the complexity of achieving electromagnetic compatibility (EMC). For efficient application, UWB systems require special EMC considerations to achieve intra and inter system EMC. In this paper an attempt has been made to highlight electromagnetic interference (EMI) and compatibility aspects pertaining to UWB systems. The electromagnetic environment and its impact in intra and inter system EMI problems, their control and required modifications of the existing standards are critically analyzed and discussed.
近年来,超宽带(UWB)系统作为一种可能对传统电子系统进行技术改进的系统,受到了相当大的关注。超宽带信号的国防应用包括通信雷达、电子情报和电子战。国防无线电和雷达系统将需要不受拦截、利用和干扰的信号。电子战的一系列措施、对抗、反对抗导致了扩频(SS)、宽带(WB)和超宽带(UWB)信号波形的使用。超宽带系统的可用性及其微妙的特性增加了实现电磁兼容(EMC)的复杂性。为了有效地应用,超宽带系统需要特殊的电磁兼容考虑,以实现系统内和系统间的电磁兼容。在本文中,一个尝试已经作出了突出的电磁干扰(EMI)和兼容性方面有关的超宽带系统。对电磁环境及其对系统内和系统间电磁干扰的影响、电磁干扰的控制和对现有标准的修改进行了批判性的分析和讨论。
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引用次数: 12
Properties of indium oxide thin films prepared by reactive electron beam evaporation technique for EMI control 反应电子束蒸发法制备用于电磁干扰控制的氧化铟薄膜的性能
J. Asbalter, S. Karunakaran, A. Subrahmmanyam
The phenomenon of electromagnetic interference (EMI) is well known. For the specific case of video displays the EMI control requires transparency in the visible spectrum. In the present paper, the EMI shielding properties of indium oxide (IO) thin films have been studied. These IO thin films of thickness ranging between 100-150 nm have been prepared on glass substrates by the reactive electron beam evaporation technique. The electrical and optical properties of these IO films have been studied by varying the substrate temperature. The films have a resistivity of the order of 1.0/spl times/10/sup -4/ ohm cm and an optical transparency of 85%. It is found that the EMI shielding efficiency (SE) of IO films (of 100 nm thickness) is very much comparable to that of the silver coated metal sheet in the measured frequency range 1 MHz to 800 MHz. In order to understand these results, preliminary analyses have been carried out by evaluating the conducting carrier density and the AC magnetic susceptibility measurements. The analyses clearly indicate the required properties of IO films for EMI applications.
电磁干扰(EMI)现象是众所周知的。对于视频显示的具体情况,电磁干扰控制要求在可见光谱中透明。本文研究了氧化铟薄膜的电磁干扰屏蔽性能。利用反应电子束蒸发技术在玻璃衬底上制备了厚度在100 ~ 150nm之间的IO薄膜。通过改变衬底温度,研究了这些IO薄膜的电学和光学性质。薄膜的电阻率为1.0/spl倍/10/sup -4/欧姆cm,光学透明度为85%。研究发现,在1 ~ 800 MHz的测量频率范围内,100 nm厚度的IO膜的电磁干扰屏蔽效率与镀银金属板的屏蔽效率相当。为了理解这些结果,我们通过评估导电载流子密度和交流磁化率进行了初步分析。分析清楚地指出了电磁干扰应用所需的IO薄膜的性能。
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引用次数: 1
Importance of EMC education EMC教育的重要性
G. Deb
This paper summarises the strategy of EMC education in India and abroad. A formal EMC educational course basically includes a broad comprehensive introduction to electromagnetic interference (EMI) problems and their hardening and analysis techniques, computational electromagnetics, methods of EMI measurement and various standards and specifications used in the international levels, as well as instrumentation and case histories of the EMC problems. This is also aimed at training the working engineers in industries, as engineers are keenly interested in EMC because of the competitive nature of today's market. The educational course is designed by the expert teaching staff to provide proper motivation and realism and practical aspects of the EMI situations. The course is divided into two parts. To begin with, the education course may consist of a lecture segment covering the essential topics like EMC aspects, EMC requirements for electronic systems, signal spectra, crosstalk, shielding, electromagnetics etc., and is followed by practical design of various live electromagnetic problems experienced in information technology products and processes, measurements, seminars both by students and by experts from the industries, R&D houses and visits to EMC design centres in the second part. The paper addresses the syllabus of this integrated EMC course which is taught in undergraduate level of the Universities/Institutions. The paper emphasises the importance of nonformal EMC education to produce skilled manpower to look after the EMC design and measurement techniques in electronic industries.
本文对印度和国外的EMC教育策略进行了总结。一门正式的电磁兼容教育课程主要包括电磁干扰(EMI)问题及其强化和分析技术、计算电磁学、电磁干扰测量方法和国际上使用的各种标准和规范,以及电磁兼容问题的仪器和案例历史。这也是为了培训在行业工作的工程师,因为工程师对EMC非常感兴趣,因为当今市场的竞争性质。教育课程由专业教学人员设计,以提供适当的动机和现实主义以及EMI情况的实际方面。课程分为两个部分。首先,教育课程可能包括讲座部分,涵盖基本主题,如EMC方面,电子系统的EMC要求,信号频谱,串扰,屏蔽,电磁学等,然后是在信息技术产品和过程中经历的各种现场电磁问题的实际设计,测量,学生和行业专家的研讨会,研发机构和参观EMC设计中心。本文论述了高等院校本科阶段电磁兼容综合课程的教学大纲。本文强调了非正规电磁兼容教育对培养电子工业电磁兼容设计和测量技术人才的重要性。
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引用次数: 6
EMI/EMC control methods during design and development of an airborne system. A case study 机载系统设计与开发中的电磁干扰/电磁兼容控制方法。案例研究
K. R. Rajeswara Rao, K. Suryanarayana, K. Nageshwara Rao
Filtering, grounding and shielding are the most important parameters through which EMC can be achieved against electrostatic discharge, conducted susceptibility and radiated susceptibility. In this technical paper, the authors narrated their practical approach in solving EMI problems in some of the important sub-systems. The authors stressed the need for stage by stage analysis in suppressing the conducted as well as radiated noise. This paper also contains the EMI hardening techniques adopted to achieve EMC and also precautionary measures taken during EMI/EMC performance evaluation.
滤波、接地和屏蔽是实现电磁兼容抵抗静电放电、传导磁化率和辐射磁化率的最重要参数。在这篇技术论文中,作者叙述了他们在一些重要子系统中解决电磁干扰问题的实际方法。作者强调了对传导噪声和辐射噪声进行逐级分析的必要性。本文还介绍了实现电磁兼容所采用的电磁干扰强化技术以及在电磁干扰/电磁兼容性能评估中采取的预防措施。
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引用次数: 0
Epidemiological and laboratory studies on the cancer risk from electromagnetic fields: an overview 电磁场致癌风险的流行病学和实验室研究综述
Y. Ahuja, P. Jahan, S. Bhargava
Electricity has played a significant role in modern developments and has become a part of our daily life. But electricity is invariably associated with electric and/or magnetic fields. Consequently, we are surrounded by electromagnetic fields (EMFs). In homes and workplaces we run our gadgets by electricity at power-line frequencies (50 Hz: low frequency). Whereas, wireless communications, including cellular phones, are operated at microwaves and shortwaves (high frequency). The question arises: is excessive exposure to EMFs harmful, more specifically carcinogenic? To answer this question a large number of epidemiological surveys and laboratory studies have been carried out largely during the 1980s and 1990s. The results are controversial and inconclusive. This paper presents a comprehensive overview of the possible detrimental effects of time-dependent EMFs, including some experimental work carried out in the authors' laboratory. The emphasis is focused on the rise of cancer in humans as a consequence of exposure to EMFs.
电在现代发展中发挥了重要作用,已经成为我们日常生活的一部分。但是电总是与电场和/或磁场联系在一起。因此,我们被电磁场包围着。在家庭和工作场所,我们使用电力线频率(50赫兹:低频)的电力来运行我们的小工具。然而,无线通信,包括蜂窝电话,是在微波和短波(高频)下操作的。问题来了:过度接触电磁场有害吗,更确切地说致癌吗?为了回答这个问题,主要在1980年代和1990年代进行了大量流行病学调查和实验室研究。结果是有争议的和不确定的。本文全面概述了时间依赖性电磁场可能产生的有害影响,包括在作者实验室进行的一些实验工作。重点是暴露于电磁场导致的人类癌症发病率的上升。
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引用次数: 3
Study of conducted susceptibility of power converters 电源变换器的传导磁化率研究
M. Sudheer, M. Gunasekaran
The most widely used offline switched mode power supplies (SMPS) are prone to conducted noise, despite line filters and other protection circuitry at their front-end. They are exposed to LV power line transients which are one of the most dangerous types of conducted noise. These transients can be either differential mode (DM) type or common mode (CM) type. The CM line transients can cause malfunctioning of SMPS during its normal working and hence cause disturbance in its output voltage. One of the types of malfunctioning of SMPS because of CM transient is studied here. Three types offline SMPS namely forward, flyback and half-bridge of same output ratings are considered. Simulation results, experimental results and a method to eliminate such malfunctioning are presented.
尽管在其前端有线路滤波器和其他保护电路,但最广泛使用的离线开关模式电源(SMPS)容易产生传导噪声。他们暴露在低压电力线瞬变中,这是最危险的传导噪声之一。这些瞬态可以是差模(DM)型或共模(CM)型。CM线瞬变会导致SMPS在正常工作时发生故障,从而引起SMPS输出电压的扰动。本文研究了一种由CM暂态引起的SMPS故障类型。考虑了具有相同输出等级的正向、反激和半桥三种离线SMPS。给出了仿真结果、实验结果和消除故障的方法。
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引用次数: 4
期刊
Proceedings of the International Conference on Electromagnetic Interference and Compatibility
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