BNC型信号电涌保护器退耦元件选择及波形分析

BNC Type Signal Surge Protector Decoupling Component Selection and Waveform Analysis

针对多级信号电涌保护电路配合问题,研究了由气体放电管、电阻或电感、瞬态抑制二极管组成的BNC型信号电涌保护器的保护电路,使用Haefely PSURGE 6.1浪涌发生器,取不同退耦电阻和退耦电感值,对保护电路进行冲击放电实验,并且使用两个罗氏线圈分别测量气体放电管和瞬态抑制二极管中流过的电流,借以分析气体放电管、瞬态抑制二极管从开始到结束的工作过程。实验结果表明退耦电阻、电感的取值会影响残压,但是随着电阻或电感值的变化,对残压的影响会逐渐减小,并从理论上提出在退耦电阻旁串联一个电感值为μH量级的退耦电感以进一步降低残压的方法;研究结果还指出,电阻电感效应和线路中电感效应是产生负向尖峰的原因,并对冲击实验产生的残压波形进行分析。

For multi-level signal surge protection circuit with the problem of fitting,researching on BNC type protection circuit consisting of gas discharge tubes, resistive or inductive, Transient Voltage Suppressor.The protection circuit which takes different deeoupling resistor and decoupling inductor values is used to impulse discharge experiments by using Haefely PSURGE 6.1 surge generator. Current flowing via GDT and TVS tested by two respective Rogowski coils to analyze working process from beginning to end. Experimental results show that the deeoupling resistor, inductor values will affect the residual voltage, but as resistance or inductance changes, the impact of residual voltage will gradually decrease. Furthermore,theoretically proposed to further reduce the residual voltage by way of the deeoupling resistor in series with an inductance value in order of magnitudeμH. The results also indicate that inductance effects of resistance and electric circuit are causes to generate negative spikes, and to analyze the impact of residual voltage waveform generated by experiments.