基于PLC的静电放电试验系统的设计

设计了基于可编程控制器(PLC)的静电放电实验系统,对静电保护器件压敏电阻进行静电放电自动测试。首先根据IEC61000-4-2标准,设计静电放电发生源回路,选择可控放电频率的转盘式放电开关和具有纳秒级响应时间和集肤效应小的鼠笼式分流器。其次设计由工控机、示波器、PLC、触摸屏等组成的控制系统,开发相应的控制软件及数据处理系统,实现静电放电自动测试。最后选用不同等级的压敏电阻作为测试对象,对测试装置进行实验验证,结果表明,研究开发的静电放电自动测试装置可以满足压敏电阻静电放电测试的要求,对压敏电阻静电防护的研究具有重要意义。

Development of electrostatic discharge test system based on PLC

This paper designed an electrostatic discharge(ESD)test system based on PLC and automatically tested the electrostatic discharge of varistor which is the electrostatic protective device.First according to the request of standard IEC61000-4-2,the source circuit of ESD is designed,controlled discharge frequency dial style discharging switch and squirrel-cage shunt with nanosecond response characteristic and small skin effect are selected.Next the control system is composed of industrial control computer、oscilloscope、PLC and touch-screen,correspondent control software and data processing system is developed.Finally different voltage grade varistors are selected as test sample to verify the test system.The result shows the designed ESD automatic test system satisfies requirements of varistor ESD test,which is very significant in ESD protection research of varistor.