一种新型信号电涌保护器的设计

信号电涌保护器(信号SPD)是广泛应用于信号系统终端设备的一种雷电防护装置。为了提高其自身元器件安全性和实现故障指示功能,同时考虑到电路的复杂程度和内部结构空间的有限性,本文设计研究了一种新型的信号SPD,该产品使用了高分子正温度系数电阻(PTC)来保护其他的元器件,并增加了集成故障指示器。将该产品进行瞬态抑制二极管(TVS)、串联电阻的过热保护模拟试验以及信号SPD测试标准中的冲击电流、传输特性和过载失效模式3项试验,试验结果表明:新产品具有热保护功能,且参数指标完全满足信号SPD测试标准的要求。同时,产品具有无源的故障指示器,适用于信号可以短时中断的系统。

Design of a New Type Signal Surge Protective Device

The signal surge protective device is a lightning protection device which is widely used in the terminal equipment of signal systems. In order to improve the safety and realize the fault indication function of its components, taking the complexity of the circuit and the limitation of the internal structure space into account, a new signal SPD is designed and studied, using a polymer Positive Temperature Coefficient resistance (PTC) to protect other components, and an integrated fault indicator is added. The simulation tests of overheating protection on TVS (Transient Voltage Suppression) and series resistance, as well as three tests on the impact current, transmission characteristics and overload failure modes in the SPD test standards, are conducted, and the results show that: the new product has the function of thermal protection and all the parameters meet the requirements of the SPD test standards. At the same time, the product has a passive fault indicator, which is suitable for a system that can be interrupted in a short time.