Analysis of a planar S-type folded pulse forming line for compact high-power pulsed source
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摘要: 以FR-4环氧玻璃纤维布为介质材料，研制了一种S型平板折叠式固态脉冲形成线。从理论上和实验上分析了脉冲形成线的放电过程。重点研究了边缘特性对其特性阻抗的影响，给出了改进的特征阻抗表达式; 分析了相邻效应和集肤效应对脉冲形成的影响，给出了脉冲波形中出现高频噪声的原因; 实验上验证了使用寿命与外加电场的关系。采用多级折叠线串并联模块化技术，提高了模块电压，降低了特性阻抗，研制了一种基于串并联技术的Blumlein线模块。该模块的耐压大于120 kV，特性阻抗约为7 Ω，脉冲宽度为138 ns。Abstract: A kind of planar S-type folded solid-state pulse forming line is designed using FR-4 epoxy glass fiber cloth as the dielectric material. The discharge process of the pulse forming line is analyzed theoretically and experimentally. The margin effect on its characteristic impedance is studied, and the modified characteristic impedance expression is given. The neighboring and skin effects on the pulse formation are also analyzed, which induce a super-imposition of high frequency noise on the original signal. The dependence of lifetime on the applied electric field is verified. Series-parallel and modular technology of multistage folded line is used to increase the withstanding voltage and reduce its characteristic impedance. A Blumlein line module based on series-parallel technology is designed, whose withstanding voltage of the module is greater than 120 kV, the characteristic impedance is about 7 Ω, and the pulse width is 138 ns.
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Figure 3. Simulation output waveform of S-type folded planar pulse forming line at the condition of the impedance of folded line matches the impedance of load
Figure 5. Discharge waveforms of S-type folded planar pulse forming line with bend inner diameters of 1 mm, 2 mm, 3 mm and 4 mm, respectively
Figure 6. Discharge waveforms of S-type folded planar pulse forming line at different charging voltage
Figure 8. The dependence of lifetime of S-type folded planar pulse forming line on the ratio Ebr/Ep
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