薄膜介质层绕式Blumlein线理论与实验研究
Theoretical and experimental study on folded film dielectric parallel-plates Blumlein line
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摘要: 对薄膜介质层绕式Blumlein线的特性参数进行了理论分析。采用Pspice软件对电路模型进行了计算，分析了开关电感、寄生电阻对负载输出波形的影响。结果表明:开关电感的存在使得负载波形前沿变缓，后延波形扭曲变差，寄生电阻会影响负载的电压输出效率。采用模拟软件对传输线中的电磁场分布进行了计算，结果表明薄电极边缘场畸变以及折叠弯曲部分的场变化是绝缘介质耐压必须考虑的因素。基于此理论分析，设计制作了一种新型薄膜介质Blumlein线，绝缘材料为聚酯薄膜，单层薄膜厚100 μm，电极为厚50 μm的铜皮，单元模块设计耐压50 kV。进行了三级模块串联叠加实验,充电25 kV,匹配负载输出60 kV,脉冲上升沿80 ns,脉冲宽度200 ns。
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关键词:
- 折叠型平板Blumlein线 /
- 薄膜介质 /
- 电场分布 /
- 脉冲形成线 /
- 电路模型
Abstract: The characteristic parameters of a folded film dielectric parallel-plates Blumlein line were analyzed theoretically. The equivalent circuit model was simulated using Pspice software considering the effect of switch inductance and parasitic impedance on the output waveform. Simulating result shows that the increase in switch inductance slows the rise edge and distorts the fall edge of the pulses, introducing reflections as well. The parasitic impedance causes some power loss in the device so that the output pulse amplitude is lower than expected. The electromagnetic field distributions were simulated. The electric field distortion at the rim and bend part of the film electrode must be considered in the insulation design of the folded parallel-plates Blumlein line. Based on the theoretical a -
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