层叠Blumlein线脉冲叠加特性

Voltage adding character of stacked Blumlein lines generator

利用传输线等效放电模型对层叠Blumlein线的脉冲叠加特性进行了分析。结果表明:外部短路阻抗是降低层叠Blumlein线脉冲叠加效率的主要因素,其中,短路电感产生输出波形平顶的衰减,相对衰减量取决于叠加级数以及短路等效电感与传输线电感之比,短路电容产生输出波形前沿的慢化,前沿慢化的相对值取决于叠加级数以及短路等效电容与传输线等效电容之比;由于各级开关导通时间分散性的存在,输出波形的前沿及后沿皆呈阶段状,相当于产生了时间量等于开关导通分散性时间的前沿及后沿慢化现象。增加传输线外部的短路阻抗、减小多开关的导通分散性是提高层叠Blumlein线的脉冲叠加效率、改善输出波形的有效途径。

The article analyzed the pulse voltage adding character of stacked Blumlein line generator.The parasitical shorted impedance is found to be the main factor affecting the adding efficiency.The parasitical inductance attenuates the flat top,and the attenuation extent depends on the stage number and the ratio between the shorted inductance and the transmission line inductance. The parasitical shorted capacitance slows the rise time,and the relative value depends on the stage number and the ratio between the shorted capacitance and the transmission line capacitance.The jitter of multiple switches leads to the slowing of the rise time and the fall time.Increasing the parasitical shorted impedance and decreasing the switch jitter are the best approaches to improve the adding efficiency and the output waveform.