共查询到19条相似文献,搜索用时 515 毫秒
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《电子科技文摘》2006,(11)
0625771传导EMI的测试〔刊,中〕/陈锋//电子质量.—2006,(8).—70-72(D)在传导EMI(电磁干扰)中既存在共模电流也存在差模电流,要很好的分析传导EMI系统,就很有必要对共模干扰信号和差模干扰信号分离开来单独进行测试。这样,共模和差模噪声的分离就显得很重要了。参30625772液晶显示器辐射干扰对策〔刊,中〕/杨茂昌//电子质量.—2006,(8).—57-58,77(D)0625773基于不确定度分析对电阻法测量温升的研究〔刊,中〕/王贵虎//电子质量.—2006,(7).—26-28(D)0210可靠性基础、质量管理与控制0625774关于ISO/TS16949的产品特性〔刊,中〕/敖景… 相似文献
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《中国无线电电子学文摘》2007,(3)
TN03,TP2742007030001一种新的传导型共模/差模EMI分离测试网络/罗萍,李肇基,陈光[礻禹](电子科技大学微固学院)//电子测量与仪器学报.―2006,20(1).―64~67.传统的传导型电磁干扰(EMI)噪声的测试多为混合测试或分时分离测试,由于共模和差模EMI噪声没有完全分离或不为同一时刻 相似文献
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本文介绍了与EMI传导相关的共模及差模电流产生的原理以及静点和动点的概念,然后详细地说明了在变压器结构中使用补偿设计以及静点和动点的调整方法,以提高EMI的传导性能。最后给出了相应的实验波形和测试结果。 相似文献
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一、传导干扰的特点1.传导干扰的组成 传导干扰主要由两部分组成,即:差摸干扰和共模干扰,因此在设计电源EMI滤波器时应分清干扰的特性,识别哪些是差模干扰,哪些是共模干扰,从而有针对性地对传导干扰进行抑制。 相似文献
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传导发射是电磁兼容设计中的重要问题之一。为了满足标准中对传导发射限制的要求,通常使用EMI滤波器来抑制电子产品产生的传导噪声。快速选择或者设计一个满足需要的滤波器是解决问题的关键。传导噪声分析技术包括共模噪声、差模噪声分析,共模阻抗、差模阻抗分析,这是滤波器设计的基础。 相似文献
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开关电源电磁干扰滤波器插入损耗的研究 总被引:1,自引:0,他引:1
研究了电磁干扰(EMI)滤波器的共模和差模插入损耗(IL),并进行理论分析和测量;分析了影响IL的各种原因及改进方法。最后,测量了EMI滤波器插入损耗,为了检验EMI滤波器对开关电源的电流(电压)谐波的抑制效果,测量了开关电源的电流(电压)谐波分量,列出了测量数据,并对测量结果进行分析,总结出开关电源传导干扰的特点。测量结果验证了理论计算和分析的正确性。 相似文献
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Meng J. Ma W. Pan Q. Zhao Z. Zhang L. 《Industrial Electronics, IEEE Transactions on》2006,53(6):1853-1861
In this paper, a general lumped circuit modeling method is proposed to describe the conducted electromagnetic interference (EMI) coupling mechanism for the switching power converters. The EMI characteristics of the converters can be analytically deduced from a circuit theoretical viewpoint. The shunt and series impedance insertion method is introduced to identify the differential-mode (DM) and common-mode (CM) noise impedances and voltage sources. The procedure of parameters estimation for the noise models comprises several simple measurements and is convenient to be implemented. Experimental illustrations are also included to verify the validity of the proposed method. Comparison between the measured and predicted results shows that the EMI modeling method can provide adequate prediction of the EMI feature for power-switching converters 相似文献
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A time-domain technique for the design of passive power line conducted electromagnetic interference (EMI) filters in the frequency range 150 kHz-30 MHz is described. A digital storage oscilloscope (DSO) with adequate sampling, storing and processing features is sufficient for the design using the proposed technique. Accordingly, Agilent's Infiniium Oscilloscope (Model 54810A) has been used. The signals from LISN are directly fed into the two channels of the DSO where they are added and subtracted to separate the CM and DM components, thereby eliminating the need for common-mode-differential mode (CM-DM) separator. These components are stored in the DSO. A specially designed filter design software (FDS), residing in the DSO, estimates the noise spectrum by computing the Bartlett and Welch periodograms. It also computes the filter component values. Thus, the sampling of the conducted noise, separation of CM and DM components, signal processing, and filter value computations are all done using one DSO. A spectrum analyzer is not required. Bartlett periodograms have been preferred over Welch periodograms due to low memory storage requirements of the former. The proposed technique has been applied to the design of power line filter for a switched mode power supply (SMPS), and satisfactory results have been obtained. The proposed measurement scheme is compact, economical, and convenient. All the details of this work are presented. 相似文献
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对于传导性干扰的CM和DM的分离可以采用硬分离和软分离的方法,详细介绍了使用算法的软分离方法,并将软分离的单模态信号与测量信号比较,结果证明软分离的方法是成功的. 相似文献
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共模噪声是高速数字电路产生电磁干扰的主要原因,而共模电感又是共模噪声大小的决定因素。以多层板的微带线为模型,推导出在偏离地平面中心以及跨越不连续地平面的情况下,PCB上差分对共模电感的定量表达式,并对其共模噪声的特性进行了详细讨论。其结论可以帮助设计人员理解共模噪声产生机制,并针对具体电路走线定量分析,提前准确发现设计中潜在的问题。 相似文献
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It is well known that common-mode (CM) conducted electromagnetic interference (EMI) is caused by the common-mode current flowing through the parasitic capacitance of transistors, diodes, and transformers to ground in the power circuit. Because of the potential for interference with other systems it is necessary to attenuate this noise. Ordinarily this is accomplished by using a magnetic choke across the input power lines, resulting in penalties to the overall size and cost of the completed system. In order to lessen the requirement for this magnetic choke, there has been a desire to introduce noise cancellation techniques to the area of EMI. This text introduces a method of canceling the common-mode EMI by using a compensating transformer winding and a capacitor. Compared with other cancellation techniques, it is much simpler and requires no additional transistors and gate-drive circuitry since it merely adds a small copper winding and a small capacitor. By using this technique the size of the EMI filter can be reduced, especially for applications requiring high currents. In this paper, the new method for passive noise cancellation is applied to many popular converter and inverter topologies. The method, results, and ramifications of this technique are presented in order of appearance. 相似文献
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提出近场辐射电磁干扰模态测试方法,设计近场模态检验测试系统,采用近场电磁场头对待测设备进行扫描式测量,获得待测设备的近场电磁场分布情况,并根据测得电磁场强度大小可分析得到待测设备的辐射EMI模态。实验结果表明,该方法可对电子电路的近场辐射EMI模态进行有效识别和检验,分别得到近场辐射共模噪声和差模噪声EMI模态,为辐射电磁干扰噪声的抑制提供有益参考。 相似文献
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Tarateeraseth V. Hu B. See K. Y. Canavero F. G. 《Power Electronics, IEEE Transactions on》2010,25(1):111-117