A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of...A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of LTDs. In the model, each brick in each cavity is capable of operating with jitter in its switch. Additionally, the manner of triggering cables entering into cavities was considered. The performances of the LTD module operating with three typical cavity-triggering sequences were simulated and the simulation results indicate that switching jitter affects slightly the peak and starting time of the output current pulse. However, the enhancement in switching jitter would significantly lengthen the rise time of the output current pulse. Without considering other factors, a jitter lower than 10 ns may be necessary for the switches in the LTD module to provide output current parameters with an acceptable deviation.展开更多
Output-pulse shaping capability of a linear transformer driver （LTD） module under different conditions is studied, by conducting the whole circuit model simulation by using the PSPICE code. Results indicate that a h...Output-pulse shaping capability of a linear transformer driver （LTD） module under different conditions is studied, by conducting the whole circuit model simulation by using the PSPICE code. Results indicate that a higher impedance profile of the internal transmission line would lead to a wider adjustment range for the output current rise time and a narrower adjustment range for the current peak. The number of cavities in series has a positive effect on the output- pulse shaping capability of LTD. Such an improvement in the output-pulse shaping capability can primarily be ascribed to the increment in the axial electric length of LTD. For a triggering time interval longer than the time taken by a pulse to propagate through the length of one cavity, the output parameters of LTD could be improved significantly. The present insulating capability of gas switches and other elements in the LTD cavities may only tolerate a slightly longer deviation in the triggering time interval. It is feasible for the LTD module to reduce the output current rise time, though it is not useful to improve the peak power effectively.展开更多
根据已有的实验数据和理论,给出了抖动和延时的数值表示,利用Matlab软件生成随机数组模拟开关延时和抖动。在Simulink环境下建立简化模型仿真多子块并联直线型变压器驱动源(LTD)模块的工作特性。通过M文件控制模块内多个开关的击穿时序...根据已有的实验数据和理论,给出了抖动和延时的数值表示,利用Matlab软件生成随机数组模拟开关延时和抖动。在Simulink环境下建立简化模型仿真多子块并联直线型变压器驱动源(LTD)模块的工作特性。通过M文件控制模块内多个开关的击穿时序仿真开关抖动,分析开关抖动对40个支路并联输出电流1MA、上升时间100ns的LTD模块输出功率峰值及前沿的影响。模拟结果表明,在一定范围内,随着抖动增大,LTD模块输出功率峰值减小,脉冲前沿显著增加,系统的稳定性随抖动增加而降低。随着开关抖动增大,输出到负载的峰值功率减小的速率增大,而脉冲前沿近似于线性增加。由于开关抖动将影响负载输出,为满足一定的系统可靠性要求,存在一个抖动阈值,对于40个子块并联的1 MA LTD模块,在系统可靠性要求±5%时,其抖动阈值约为17ns。展开更多
基金supported partly by National Natural Science Foundation of China(Nos.50637010,51077111)partly by the State Key Laboratory of Electrical Insulation and Power Equipment of Xi'an Jiaotong University of China(EIPE09207)
文摘A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of LTDs. In the model, each brick in each cavity is capable of operating with jitter in its switch. Additionally, the manner of triggering cables entering into cavities was considered. The performances of the LTD module operating with three typical cavity-triggering sequences were simulated and the simulation results indicate that switching jitter affects slightly the peak and starting time of the output current pulse. However, the enhancement in switching jitter would significantly lengthen the rise time of the output current pulse. Without considering other factors, a jitter lower than 10 ns may be necessary for the switches in the LTD module to provide output current parameters with an acceptable deviation.
基金supported by National Natural Science Foundation of China (Nos. 50637010, 51077111)the State Key Laboratory of Electrical Insulation and Power Equipment of Xi'an Jiaotong University of China (EIPE 09207)
文摘Output-pulse shaping capability of a linear transformer driver （LTD） module under different conditions is studied, by conducting the whole circuit model simulation by using the PSPICE code. Results indicate that a higher impedance profile of the internal transmission line would lead to a wider adjustment range for the output current rise time and a narrower adjustment range for the current peak. The number of cavities in series has a positive effect on the output- pulse shaping capability of LTD. Such an improvement in the output-pulse shaping capability can primarily be ascribed to the increment in the axial electric length of LTD. For a triggering time interval longer than the time taken by a pulse to propagate through the length of one cavity, the output parameters of LTD could be improved significantly. The present insulating capability of gas switches and other elements in the LTD cavities may only tolerate a slightly longer deviation in the triggering time interval. It is feasible for the LTD module to reduce the output current rise time, though it is not useful to improve the peak power effectively.
文摘根据已有的实验数据和理论,给出了抖动和延时的数值表示,利用Matlab软件生成随机数组模拟开关延时和抖动。在Simulink环境下建立简化模型仿真多子块并联直线型变压器驱动源(LTD)模块的工作特性。通过M文件控制模块内多个开关的击穿时序仿真开关抖动,分析开关抖动对40个支路并联输出电流1MA、上升时间100ns的LTD模块输出功率峰值及前沿的影响。模拟结果表明,在一定范围内,随着抖动增大,LTD模块输出功率峰值减小,脉冲前沿显著增加,系统的稳定性随抖动增加而降低。随着开关抖动增大,输出到负载的峰值功率减小的速率增大,而脉冲前沿近似于线性增加。由于开关抖动将影响负载输出,为满足一定的系统可靠性要求,存在一个抖动阈值,对于40个子块并联的1 MA LTD模块,在系统可靠性要求±5%时,其抖动阈值约为17ns。
