Circuit simulation of double-exponent pulse current generator
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摘要: 双指数脉冲电流发生器可用于电子系统端口传导耦合实验，主要用于研究电磁敏感器件的电磁脉冲效应的损伤规律。根据实验要求，该发生器能够输出前沿10 ns、脉宽100 ns、电流幅值3 kA的双指数脉冲电流。建立了该发生器的电路模型，并对杂散电容和电感对输出电流波形的影响进行了分析。模拟计算表明，电流信号的过冲现象和后沿叠加干扰信号的原因可能是电阻负载自身存在的杂散电容和测量电流的线圈附近的杂散电容和电感的共同作用导致的。经过理论计算，如果在测量线圈附近添加适当的滤波设备或者用无损同轴电缆引出电流，能够明显地抑制过冲和干扰。Abstract: Double-exponent pulse current generator can be used in conducted coupling experiment of electronic system ports. The generator can produce a double-exponent pulse current of rise-time 10 ns, pulse width 100 ns and current amplitude 3 kA. In this article, a circuit model of generator is established. Influence of stray capacitor and inductance on pulse current is analyzed and a possible optimizing scheme is also mentioned. Results of simulation show that stray capacitor at load can cause overshoot on the current waveform. At the same time, stray capacitor and inductance at current measurement zone can also cause oscillating interferential wave on the falling edge of current waveform. There are two possible methods to restrain the overshoot and interference. One is that a filter should be fitted at the current measurement zone. The other is that a lossless coaxial cable with proper impedance should be used to transmit the current.
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Key words:
- double-exponent /
- generator /
- stray capacitor /
- stray inductance
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