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传输线脉冲发生器研制及其对电路板抗静电放电干扰的测试

DOI: 10.13336/j.1003-6520.hve.2015.05.026, PP. 1610-1617

Keywords: 传输线脉冲发生器,静电放电,上升时间,印刷电路板,耦合,单片机

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Abstract:

为研究静电放电对电路板的干扰,利用传输线脉冲发生器提供激励脉冲,并配合测试探头,对电路板进行干扰测试,并以一单片机系统为测试对象进行干扰研究。首先,根据传输线脉冲生成原理,用同轴电缆、水银继电器及高压源设计和制作了1个传输线脉冲发生器,并将脉冲波的上升时间控制在1ns以内;然后,分别用电场探头、磁场探头和注入探头建立了激励信号与被干扰对象之间的电场、磁场和传导耦合,通过试验观察了其耦合干扰信号,并研究了测试单片机系统的抗干扰特点。通过研究及测试得出为保证传输线脉冲发生器的脉冲上升时间的要求,应选择快速继电器,控制好继电器与同轴电缆的连接以减少寄生参数的影响;用传输线脉冲发生器配合电场、磁场和注入探头进行测试,可以探查电路板的局部抗干扰薄弱环节;测试的单片机系统的抗干扰特点体现在其局部区域对磁场干扰较敏感,晶振引脚和复位引脚对直接注入干扰更敏感。

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