基于电快速脉冲群发生器主电路的建模和设计

Modeling and design of main circuit for electrical fast transient pulse / burst generator

为了提高电快速瞬变脉冲群发生器输出波形的质量,分析了脉冲群发生器主电路的工作原理,建立了发生器波形形成电路的等效模型,研究了等效电路储能电容充放电过程,利用电网络分析法推导了高压脉冲波形的数学解析式。基于脉冲波形的时间特性,确定主电路结构参数;采用单一变量法和Pspice仿真研究脉冲峰值的幅值特性,选取合适的陡化电容。考虑寄生参数对输出波形的影响,采用方波控制开关的方法建立脉冲群主电路的模型,实现脉冲群波形的输出仿真。在此基础上,设计了电快速瞬变脉冲群发生器的主回路,并搭建了脉冲波形测试平台。测试结果表明,单个高压脉冲上升沿、半宽和脉冲幅值均符合IEC61000-4-4标准中的要求,验证了主电路参数的合理性。

In order to improve the output waveform quality of electrical fast transient pulse/burst generator, the working principle of its main circuit is analyzed,the equivalent circuit of pulse train generator is established,the charge/discharge process of energy-storage capacitor in equivalent circuit is studied,and the electric network analytical method is applied to deduce the mathematical analytical formula for high voltage pulse waveform. The parameters of main circuit are determined based on the time characteristics of pulse waveform and the simple variable method and Pspice simulation are applied to study the amplitude characteristics of pulse peak for the appropriate selection of sharpening capacitance. The effect of parasitic parameters on the output waveform is considered and the square-wave controlled switching is used in the main circuit model of pulse train to simulate the output waveforms of pulse train,based on which,the main circuit of electrical fast transient pulse/burst generator is designed and the test platform is built. Test results show that,the rising edge,half width and amplitude of single high-voltage pulse all meet the requirements of IEC61000-4-4,verifying the rationality of main circuit parameters.