一种基于磁饱和变压器的DSRD脉冲电源设计

Design of drift step recovery diode pulse power generator based on magnetic saturation transformer

漂移阶跃恢复二极管(DSRD)具有开关速度快、重频高、工作电流大等优点,在脉冲功率技术中很有应用前景。研究了一种基于磁饱和变压器的DSRD泵浦电路拓扑结构,具有体积小、重量轻、可靠性高等特点。根据DSRD的工作要求,采用功率MOSFET作为初级开关,结合磁饱和变压器的升压和磁开关特性,设计了DSRD的泵浦电路。利用Pspice软件对电路进行了仿真分析,验证了电路原理的正确性。在仿真分析的基础上,完成了一台原理样机的设计和电路实验。实验结果表明,该电源样机在前级充电电压800 V条件下,50Ω负载上产生的脉冲幅值大于7 kV,前沿小于4.2 ns(10%~90%),半高宽约10 ns。

Drift step recovery diode(DSRD)has a great application prospect in pulse power technology for its notably short switching-off time,high repetition rate and large working current.In this paper,a DSRD pump circuit topology based on magnetic saturation transformer is studied.The topology is small,light and reliable.According to the operating requirements of DSRD,a pump circuit was designed.It consists of a power MOSFET primary switch and a magnetic saturation transformer with boost and saturation characteristics.The circuit was simulated by Pspice software,which confirmed the principles of the circuit.Based on the simulation analysis,a prototype was designed and its circuit experiment was implemented.The experiment indicates that when the charging voltage is 800 V,the pulse amplitude on resistor load of 50Ωis larger than 7 kV,the rise time is less than 4.2 ns(10%90%)and the FWHM is about 10 ns.