Design of a coaxial Marx generator and field-circuit co-simulation
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摘要: 针对Marx发生器小型化的应用需求和快前沿脉冲下Marx发生器内部存在波过程的实际情况，开展了全同轴结构Marx发生器的研制和场路协同仿真。Marx发生器采用基于环形电容器、环形开关、锥形隔离电感、轴心单边充电的全同轴结构方案，避免结构偏心带来的局部场增强效应。在CST软件中建立了Marx发生器实际结构模型，利用时变材料和场路协同仿真功能实现了充放电过程的动态仿真，仿真结果显示出快前沿脉冲下Marx发生器内部存在波过程。据此可以对绝缘设计进行优化，并分析结构参数对输出脉冲的影响。研制的5级Marx发生器体积小于0.015 m3，可在10 μs内充电至88 kV，对40 Ω传输线输出峰值电压210 kV的高压脉冲，峰值功率约1.1 GW，脉冲前沿5.3 ns，半高宽11.2 ns。Abstract: To meet the requirements of miniaturization of Marx generator and analyze the discharging process in field aspect, this paper introduces a new model of coaxial Marx generator and field-circuit co-simulation method. The coaxial configuration is based on ring component, avoiding field enhancement caused by structural eccentricity. Using field-circuit co-simulation function, charging and discharging process simulation is achieved by building structure and circuit model in CST software. Simulation results show the wave process in Marx generator. This method can offer help to insulation design and pulse analysis of Marx generator. The 5-stage Marx generator's volume is less than 0.015 m3, can be charged to 88 kV in 10 μs, the output pulse's peak voltage on 40 Ω load is 235 kV, peaking power is 1.4 GW, with 5.3 ns rise time, 11.2 ns pulse width.
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Key words:
- Marx generator /
- miniaturization /
- coaxial structure /
- wave process /
- field-circuit co-simulation
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图 3 CST中的Marx发生器场路协同仿真模型
Figure 3. Field-circuit co-simulation model of Marx generator in CST
图 4 开关导通前后Marx发生器内部的电场仿真结果
Figure 4. E-field distribution in Marx generator before and after the switch closing
图 5 充电杆末端和末级电容外边缘的电场仿真结果
Figure 5. E-field at the ending of charging rod and outer edge of last capacitor
图 6 不同开关状态下，Marx发生器输出脉冲电压仿真结果
Figure 6. Voltage discharging curves under different switch conditions
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