Optimization of PFN-Marx generator
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摘要: 为了改善脉冲形成网络(PFN)-Marx发生器的输出波形，得到前沿较短、纹波因数尽可能小的输出波形，对单级PFN的特性进了仿真研究，包括PFN中末端电容、末端电感、PFN的阻抗等因素对单级PFN的输出波形的影响；建立了PFN-Marx发生器的整体仿真模型，并对采用耦合电感作为隔离电感和采用分立电感作为隔离电感进行了仿真研究。研究表明：采用耦合电感作为隔离电感可以使各级PFN的充电波形更加一致，效果更好。搭建了一个小型的PFN-Marx发生器，并研究了PFN-Marx发生器中气体开关在不同气压下导通时输出波形的差异，结果表明，升高气压有利于减小PFN-Marx发生器输出波形的前沿持续时间。
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关键词:
- 脉冲发生器 /
- PFN-Marx发生器 /
- 仿真 /
- 方波
Abstract: This paper aims to improve the output waveform of pulse forming network (PFN) -Marx generator and get output waveform of short rise time and small ripple factor. Firstly, characteristics of the single stage PFN are studied by simulation, including the impact of single stage PFN terminal capacitance, inductance and PFN terminal impedance on output waveform. The complete simulation model of PFN-Marx generator is established. Using coupled inductor as isolating inductor and using discrete inductor as isolation inductor are studied. The simulation result shows that using coupled inductor as isolating inductor can make charging waveform of PFN more consistent. A small PFN-Marx generator is built. The difference of output waveform of gas switch in PFN-Marx generator under different atmospheric pressure is studied. The result shows that increasing air pressure is beneficial to decrease the rise time of output waveform of PFN-Marx generator.-
Key words:
- pulse transformer /
- PFN-Marx generator /
- simulation /
- square wave
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图 9 不同气压下的输出电压峰值及前沿变化
Figure 9. Change of rise time and maximum voltage at different pressure of gas switch
表 1 人工传输线阻抗变化对脉冲前沿的影响
Table 1. Simulated influence of PFN impedance on pulse front
C/pF Z/Ω tf/ns 1000 8 11.07 2000 5.7 15.06 4000 4 22.04 6000 3.3 26.08 
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表 2 PFN阻抗变化对脉冲前沿的影响
Table 2. Measured influence of PFN impedance PFN on pulse front
C/pF R/Ω tf/ns 400 10 13.8 2000 4.2 26.4 6000 2.8 40.8
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