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家用电器中功率板设计最困难的是需满足相关电磁兼容法规要求。本文介绍了基于单管高频感应加热准谐振逆变器的工作原理、开关管反并联二极管实现零电压低损耗开关过程以及对谐振过程产生的谐振电流进行了理论推导;并按照GB 4824-2013标准要求对某款电磁炉进行了电源端子骚扰电压测试、不合格原因分析;并结合工程实践实施了改进抑制;最后通过复测验证了整改对策的有效性,以图为家电企业提供电磁兼容设计参考。 相似文献
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《环境技术》2018,(6)
当前断路器监测相关研究成果监测覆盖性、故障诊断实时性和抗干扰性均较差,提出并设计基于DSP的高压断路器状态智能监测系统。将高压断路器状态智能监测系统整体分为信息数据采集层和管理层两部分,利用通信单元、时钟电源、电源单元、显示单元、接口单元和数据采集单元等模块构成监测系统硬件部分。主要分析并设计了信号数据采集单元和系统抗干扰关键技术,信号数据采集中包含分合闸线圈的电流采集、动触头行程数据采集、三相主回路数据采集和开关量输入信号数据采集几部分。监测系统软件部分,在系统上电后,断路器开始进行自检,如果自检未通过,将发出警报。系统对高压断路器各种信号数据进行实时采集,估计当前断路器运行状态,将正常信号实时传输至监测中心并显示;将开断信号及相关信息数据以优先级形式传输至监测中心并显示,管理人员利用监控显示单元对断路器状态进行智能监测。实验结果表明,该系统监测覆盖系数大、故障诊断延时短、抗干扰性能强。 相似文献
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元件或装置的热响应特性可通过暴露在温度箱中模拟的温度环境下来确定。受试试品大小和所需温度环境的变化,都需要具有一定能力范围的试验箱。大多数温度箱都备有两级蒸气压缩制冷装置和能模拟-65℃~177℃范围内任何温度环境的加热装置。要求保持所需温度级的制冷,是指用来降低箱内温度的一小部分制冷,因大多数试验时间用来保持箱内温度级,故制冷装置对操作来说效率低、费用大。为了增加制冷装置效率,研制出一个两级蒸气压缩制冷装置,用来同时支持九台温度试验箱操作。通过把试验箱组成管网状集中到中心制冷装置,可使制冷能 相似文献
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本文计算和分析了冲击实验装置运行对环境造成的振动干扰,所用数据为实测分析参数,计算结果表明,冲击实验装置在运行期间对周围环境造成的振动影响是可接受的。 相似文献
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Benjamin F. Hobbs Yongshou Luo M. E. Maciejowski Conrad V. Chester 《Journal of the American Water Resources Association》1989,25(1):1-13
ABSTRACT: “Nuclear winter,” more properly called “nuclear fall,” could be caused by injection of large amounts of dust into the atmosphere. Besides causing a decrease in temperature, it could be accompanied by “nuclear drought,” a catastrophic decrease in precipitation. Dry land agriculture would then be impossible, and municipal, industrial, and irrigation water supplies would be diminished. It has been argued that nuclear winter/fall poses a much greater threat to human survival than do fall out or the direct impacts of a conflict. However, this does not appear to be true, at least for the U.S. Even under the unprecedented drought that could result from nuclear fall, water supplies would be available for many essential activities. For the most part, ground water supplies would be relatively invulnerable to nuclear drought, and adequate surface supplies would be available for potable uses. This assumes that conveyance facilities and power supplies survive a conflict largely intact or can be repaired. 相似文献
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为了使酿酒废水中总磷有效去除并达标排放,通过对酿酒废水总磷的排放情况调查,有针对性的选用高压电化学絮凝技术,对酿酒废水中总磷的去除效果进行实验研究。从实验结果看,调节进水pH值为2.3、停留时间45分钟时总磷去除率可达到99%以上,在该条件下COD的去除率也能达到50%左右,废水总磷排放浓度能够达到1.0mg/L的排放要求。 相似文献
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本文介绍了一种基于系统辨识的高压衰减器的时域校准方法。依据系统辨识的基本原理,对高压衰减器建立输入、输出误差模型,通过测量衰减前后的时域波形,计算获得衰减器的传递函数,进而获得其修正系数。该方法可同时得到高压衰减器的幅频及相频特性,并可在高压校准条件下,准确反映衰减器的高压特性,为高压衰减器的时域校准提供了技术依据。 相似文献
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综述了我国袋式除尘高温滤料在燃煤发电、垃圾焚烧发电、水泥工业等工业领域的应用现状以及高温除尘滤料未来的发展趋势。 相似文献
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A. Kunwar 《International Journal of Green Energy》2016,13(4):335-343
High penetration level of wind power has significant impact on the dynamic performance of power system. Power system with existing high-voltage direct current (HVDC) link may influence the stability of power system at high penetration level of wind power. This article investigates the stability issues of power system with existing HVDC link for different penetration level of doubly fed induction generator (DFIG) and direct drive synchronous generator (DDSG) based wind farms. The small signal stability analysis shows that power system with HVDC link has improved the stability of the power system for increased penetration of DFIG- and DDSG-based wind farms. 相似文献
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Kenneth O. Kauffman 《Journal of the American Water Resources Association》1979,15(2):387-395
ABSTRACT: In many of the limited water resource areas of the western United States most water supplies have been put to beneficial uses. Energy, a fast expanding high-priority water use, is making challenging demands for these limited supplies. Can water supplies be stretched, supplemented, or redirected so that present uses can be maintained and energy water needs satisfied? The Bureau of Reclamation is investigating innovative methods of water management, reregulation, and use to meet these demands. Related programs under study include potentials for: development of additional hydroelectric power, installation of low-head turbines in western water courses, utilization of pumped storage and underground storage, use of geo-thermal heat, extension of water supplies through more efficient irrigation systems and practices, and weather modification. 相似文献