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为了提高静电除尘效率及改变传统的工频变压器体积大成本高等缺点,针对高频电源在静电除尘中得应用问题,设计一款高性能高频高压大功率除尘电源;并介绍了基于印制电路板变压器的设计理念,通过现场测试证明了方案的可行性,为大功率高频高压开关电源的开发提供了新的实践基础。 相似文献
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本电源是基于高频高压交流母线具有多组输出的直流电源,它具有高达200kHz的开关频率,后级的整流电路由于高频交流母线的存在,使得变压器和电感的设计变得简单,滤波电容的选择也更容易。本电源由PFC电路提供400V的高压直流输入,再由MOSFET组成全桥逆变电路,在固定额率的PWM发生电路和IR2110 MOSFET驱动电路作用下,只加—个谐振电感就可实现开关管的零电压开通,可在大大降低开关损耗和噪声的同时实现直流交流的变换。整流部分采用倍流整流电路以提高原边电压的利用率,可输出低压大电流。由于采用肖特基管,—方面可使得二板管的损耗可以接受,另外—方面还避免了采用同步整流电路所面临的电路结构复杂和驱动困难。 相似文献
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箔条和箔片的性能特性及其应用和趋势 总被引:6,自引:0,他引:6
从箔条和箔片用于干扰雷达测和扰乱、迷惑、转移或者引诱进攻出发,详细论述箔条、箔条云及箔片、箔片云的雷达散射截面、带度、平移速度、下降速度及转动等情况,空间和时间我、水平和垂直极化性能、多普勒频移效应以及频谱展宽特性等,通过箔条和箔片有效成火控雷达实例,提出对抗火控雷达的三个重要因素及其采取的对策。 相似文献
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The author observes that the social fabric of engineering, the support infrastructure of the profession, and the political and economic systems of the world are undergoing shifts that affect what engineering is, how it is accomplished, and what it should do. He asks what these changes mean in terms of the educational system and explores a few of these issues that lie between academia and the industrial environment beyond. He discusses the engineering curriculum as seen from industry, the role of continuing education, research in academia 相似文献
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"电路原理"与"信号与系统"课程的整合与优化 总被引:2,自引:2,他引:2
科学技术迅速发展,新兴学料不断增加,知识总量不断增长,迫使本科教育不断向着基础化方向发展,基础课程教学在本科教育中的地位愈来愈高。计算机技术的广泛应用,离散信号与系统的基础知识已是电气类各专业的必要的教学内容。因此基础课程要从根本上整体优化课程结构。本文提出了电气类专业“电路原理”与“信号与系统”课程教学改革方案,将两门课程教学内容进行整合与优化,并在实际教学过程中进行了教学试验,缩短了教学时间,提高了教学质量。 相似文献
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Davis R.F. Kelner G. Shur M. Palmour J.W. Edmond J.A. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1991,79(5):677-701
The deposition of silicon carbide thin films and the associated technologies of impurity incorporation, etching, surface chemistry, and electrical contacts for fabrication of solid-state devices capable of operation at temperatures to 925 K are addressed. The results of several research programs in the United States, Japan and the Soviet Union, and the remaining challenges related to the development of silicon carbide for microelectronics are presented and discussed. It is concluded that the combination of α-SiC on α-SiC appears especially viable for device fabrication. In addition, considerable progress in the understanding of the surface science, ohmic and Schottky contacts, and dry etching have recently been made. The combination of these advances has allowed continual improvement in Schottky diode p-n junction, MESFET, MOSFET, HBT, and LED devices 相似文献
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文章介绍了针对特定电压变化特性的被测设备的、简单的、低成本的电压波动和闪烁的解析测量法,并将实际解析法测量计算结果与直接测量法结果进行了比较、验证,证明该方法切实可行,且符合标准规定的容差要求。 相似文献
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信号与系统课程是高等院校电类专业一门重要的专业基础课程,本文以西安明德理工学院智能制造与控制技术学院的信号与系统课程建设与教学改革为例,介绍了我院在信号与系统课程资源建设和教学改革中的探索和实践。实践证明,本文提出的五维一体化线上线下课程资源建设和混合式教学改革能够有效推动教与学两个方面的变革,有效提高课程教学质量,为同类兄弟院校的同类课程建设和教学改革起到一定的借鉴作用。 相似文献
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《Communications Magazine, IEEE》2008,46(9):52-56
Over the last 40 years in the semiconductor industry, one of the most reliable truths has been that "thepath forward is through integration." Moore's law and its various derivatives and cousins have illustrated how greater integration has provided tremendous benefits in cost, power, size, and performance. While shrinking process lithography has been a critical enabler of this trend, we should remember that tremendous innovation in device technology, circuits, system architecture, computer aided design (CAD), packaging, and many other areas have been necessary as well. The exponential integration phenomenon has not been limited to memory and microprocessors: mixed signal and radio functions have also seen striking advances in integration over the last 20 years, from cell phones to wireless LANs, integrated "systemon-a-chip" (SOC) transceivers have become prevalent in the circuits conferences, journals, and - in some applications - have even made it into commercial mainstream products. 相似文献