信号电涌保护器对信号传输影响的分析

发布时间：2018-10-30 11:55

【摘要】：信号电涌保护器(surge protective device,SPD)对信号传输的影响,主要表现在暂态抑制二极管(transient voltage suppressor,TVS)的分布电容上,通过对平衡信号SPD和非平衡信号SPD电路的原理分析,将信号SPD等效为两端口网络,利用两端口网络的T参数模型,采用理论与试验相结合的方法,试验结果得出:当TVS的分布电容值一定时,退耦电阻的阻值对幅频特性曲线-3 d B和-6 d B处的频率影响较小;退耦电阻的阻值一定时,随TVS分布电容值的增加,-3 d B和-6 d B处的频率均呈下降趋势。从信号传输的角度分析,频率越高,衰减越大,TVS的分布电容值在500~3 500 p F范围内,平衡传输时的幅频特性曲线-3 d B的频率范围为2~20 MHz,-6 d B的频率范围为5~25 MHz,非平衡传输时的幅频特性曲线-3 d B的频率范围为5~17 MHz,-6 d B的频率范围为6~20 MHz。这在防雷应用中有一定的参考价值。
[Abstract]:The effect of signal surge protector (surge protective device,SPD) on signal transmission is mainly reflected in the distributed capacitance of transient suppression diode (transient voltage suppressor,TVS). The principle of balanced signal SPD and unbalanced signal SPD circuit is analyzed. The signal SPD is equivalent to a two-port network. By using the T-parameter model of the two-port network and the method of combining theory with experiment, the experimental results show that when the value of distributed capacitance of TVS is constant, The resistance of decoupling resistance has little effect on the frequency at -3 dB and -6 dB of amplitude-frequency characteristic curve. When the decoupling resistance is constant, the frequencies at -3 dB and -6 dB decrease with the increase of the capacitance value of the TVS distribution. From the point of view of signal transmission, the higher the frequency is, the greater the attenuation is. The distributed capacitance of TVS is in the range of 500,500pF, and the amplitude-frequency characteristic curve of -3dB in balanced transmission is within the frequency range of 2 ~ 20 MHz,-6 dB, which is 5 ~ 25 MHz,. In unbalanced transmission, the amplitude-frequency characteristic curve -3 dB has a frequency range of 5 ~ 17 MHz,-6 dB and a frequency range of 6 ~ 20 MHz.. It has certain reference value in the application of lightning protection.
【作者单位】：南京信息工程大学气象灾害预报预警与评估协同创新中心;
【基金】：国家自然科学基金(编号:2081031201065)
【分类号】：TM862

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