A compact repetitive Marx generator with fast risetime
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摘要: 设计一种紧凑型重复频率快前沿Marx发生器,采用3.3 nF陶瓷电容器作为储能电容,螺旋形空芯电感作为充电电感,通过各级气体火花开关迅速放电在负载上建立了陡化前沿的输出电压波形。将电容器、气体开关、充电及隔离电感设计为同轴一体化结构,整个Marx发生器放置在一个密封的金属圆筒内,通过充氮气或者六氟化硫气体来绝缘。在考虑开关电极分散电容、回路电感等因素基础上,利用自击穿火花开关模型建立了等效放电电路模型,并利用PSpice电路模拟软件进行了数值模拟。在理论分析的基础上,通过优化电路结构,完成了12级Marx发生器的设计与研制。在50 电阻负载上获得了电压150 kV、脉宽30 ns、上升时间10 ns的脉冲波形,Marx发生器可60 Hz重复频率运行,与模拟结果基本一致。Abstract: The Marx generator especially makes use of inductive charging technology to ensure high-repetitive operation. Low-inductance capacitors of 3.3 nF are chosen as energy storage capacitors. And helix inductors are utilized as charging and grounding elements. By means of rapid discharge of each short gas spark gap, wave erection can be realized on the output load. The Marx is fitted into a tube with a diameter of 145 mm and a total length of 477 mm. The generator is pressurized with an N2/SF6 mixture. This system stores 7.9 J and is capable of delivering a current about 3.0 kA at 150 kV to a 50 load. The full width half maximum of output voltage is about 30 ns, and the rise time of the current is less than 10 ns. The repetitive frequency is 60 Hz.
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Key words:
- pulsed power /
- Marx generator /
- inductive isolators /
- repetitive frequency
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