静电放电抗扰度试验中放电电压对放电参数的影响

Effect of Discharge Voltage on Discharge Parameters in Electrostatic Discharge Immunity Test

针对静电放电(electrostatic discharge,ESD)抗扰度测试中存在的重复性问题,利用建立的ESD模拟测试系统,试验研究了接触式静电放电和非接触式静电放电(又称空气式静电放电)这2种放电模式下的放电参数,比如放电电流、上升时间、半圆环天线上的耦合电压等随放电电压的变化关系。结果表明:接触式静电放电模式下,放电参数与放电电压呈现很好的线性关系,放电参数随着放电电压的增大而呈现增大趋势,基于这种线性关系建立了ESD模拟器的严酷度模型;非接触式静电放电模式下,放电参数与放电电压关系复杂,当放电电压较低时,放电电流和耦合电压随着放电电压的增大而呈现增大趋势,上升时间最初基本保持不变,随后也呈现增大趋势,当放电电压增大到一定值时,随着放电电压的进一步增大,放电参数呈现下降趋势。上述结果说明,放电电压在静电放电抗扰度试验中起着重要作用,在进行电子设备的静电放电抗扰度试验时,既要注重放电模式的选择,又要注重所选放电模式下放电电压的使用范围。

To solve the problem of reproducibility in the electrostatic discharge （ESD） immunity test, using the ESD simulating testing system, we studied the influences of charged voltage on ESD parameters such as discharge current, rise time, and induced voltage in a semicircular loop antenna under two discharge modes, namely, contact discharge method and air discharge method. The results show that, under contact discharge mode, ESD parameters are linearly proportional to the charge voltage, and the ESD parameters increase with the increasing charge voltage. Based on this linear relation- ship, a severity model for ESD generator is established. When the discharge mode is air discharge method, the relationship between ESD parameters and charge voltage is rather complex, under lower charge voltage, the discharge current and induced voltage increase with increasing voltage, rise time changes few firstly, and then increase with in- creasing voltage. As the charge voltage increases to a certain value, the ESD parameters decrease with increasing voltage. The above results show that the discharge voltage plays an important role in ESD immunity test, when doing the electronic device ESD immunity test, choice of discharge mode, as well as the using scope of discharge voltage, should be paid attention to.