Analysis of folded pulse forming line operation.
Analysis of folded pulse forming line operation.
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DOI：
10.1063/1.4895768
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
M. Domonkos;J. Watrous;J. Parker;T. Cavazos;Kirk Slenes;Susan Heidger;D. Brown;D. Wilson
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文献类型：
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作者：
M. Domonkos;J. Watrous;J. Parker;T. Cavazos;Kirk Slenes;Susan Heidger;D. Brown;D. Wilson
基于折叠传输线和高击穿强度电介质的紧凑型脉冲形成线（CPFL）的概念，探索通过努力相结合的原理验证实验与电磁建模。采用表面贴装陶瓷多层电容器制作了小型折叠式CPFL。该线路由150个紧密并联的电容器组成，并提供300 ns的平顶脉冲。使用介电常数为37.6的聚合物-陶瓷纳米复合电介质将该概念应用于10 kV级器件。该线路被设计用于161 ns FWHM长度的脉冲进入匹配负载。该线路提供了110 ns的半高宽脉冲，并且脉冲峰值幅度超过了匹配负载的理想值。瞬态电磁分析，使用粒子在细胞的代码ICEPIC进行检查的性质，意想不到的脉冲缩短和失真。二维分析未能捕捉到异常行为。三维分析复制了脉冲形状，并揭示了弯曲是脉冲缩短的主要原因。弯曲不仅产生入射TEM波的预期反射，而且还产生垂直于主导电磁波的传播方向的坡印亭矢量的非零分量，导致功率流主要在PFL外部。该分析解释了脉冲缩短和脉冲幅度。
A compact pulse forming line (CPFL) concept based on a folded transmission line and high-breakdown strength dielectric was explored through an effort combining proof-of-principle experiments with electromagnetic modeling. A small-scale folded CPFL was fabricated using surface-mount ceramic multilayer capacitors. The line consisted of 150 capacitors close-packed in parallel and delivered a 300 ns flat-top pulse. The concept was carried to a 10 kV class device using a polymer-ceramic nanocomposite dielectric with a permittivity of 37.6. The line was designed for a 161 ns FWHM length pulse into a matched load. The line delivered a 110 ns FWHM pulse, and the pulse peak amplitude exceeded the matched load ideal. Transient electromagnetic analysis using the particle-in-cell code ICEPIC was conducted to examine the nature of the unexpected pulse shortening and distortion. Two-dimensional analysis failed to capture the anomalous behavior. Three-dimensional analysis replicated the pulse shape and revealed that the bends were largely responsible for the pulse shortening. The bends not only create the expected reflection of the incident TEM wave but also produce a non-zero component of the Poynting vector perpendicular to the propagation direction of the dominant electromagnetic wave, resulting in power flow largely external to the PFL. This analysis explains both the pulse shortening and the amplitude of the pulse.