【摘要】 设计了一种紧凑型同轴结构快前沿Marx发生器,该发生器采用3.3 nF陶瓷电容器作为储能电容,用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产生电压脉冲。为使整个Marx发生器结构紧凑,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,并放置在一个密封的金属圆筒内,通过充氮气和六氟化硫的混合气体来绝缘。采用理论及电路模拟的方法,分析了开关导通状态、分布电容、回路电感等因素对输出波形的影响。Marx发生器的基本运行参数为:十二级Marx发生器在负载50Ω时输出电压150 kV,开路电压达240 kV,负载输出波形脉冲宽度25 ns,上升时间约10 ns,脉冲功率源能量为7.9 J。更多还原

【Abstract】 A compact, coaxial configuration and fast-rising time Marx generator is designed, which uses a 3.3 nF ceramic capacitor as energy storage capacitor, a spiral-shaped air core inductor as a charging inductor, and generates voltage pulses by a quick gas discharge on the loads. The Marx is fitted into a tube with 14.5 cm diameter and a total length of 47.7 cm. The capacitors, charging inductors and spark gas switches are insulated with mixed gas of Sulfur hexafluoride(SF6) and Nitrogen(N2). By theoretical and circuit simulation, the influences of switch conduction states, distributed capacitance, loop inductance and stray capacitance on the output waveforms are discussed. The voltage output waveform on the load(50 Ω)of Marx generator is analyzed using the PSPICE, which shows that the output voltage is 150 kV, the open circuit voltage is up to 240 kV, the pulse width of load output waveform is about 25 ns with 10 ns rise-time, and energy of pulsed power source is 7.9 J. A lumped circuit description of the Marx that well matches the experimental results is also given.更多还原