大功率RSD开关多单元并联技术

Multi-cell Parallel Connection Technology for Great Power Switch RSD

为通过研究多单元并联技术来增大脉冲功率开关RSD(reversely switched dynistor)的功率容量,基于RSD的等离子体双极漂移模型,建立主回路和预充回路的RLC方程,采用四阶龙格-库塔方法迭代计算,得到两支路并联的RSD电流曲线。在一定的仿真条件下,RSD器件参数不同和支路电阻不同引起的电流不平衡率分别为3.56%和19.82%。在RSD并联实验中,内阻1.642mΩ的分流器和非对称连接引起的电流不平衡率分别为12.82%和20.71%。在3000μF主电容、2kV主电压下对并联的两个直径45mm的RSD堆体进行了大电流开通实验,得到了330μs脉宽下32.7kA的峰值电流。仿真和实验结果均表明,在高功率电流的快速开通机制中并联支路分流大小主要由回路参数决定,受RSD动态电阻影响很小。

In order to enlarge the power capability of pulsed power switch RSD（reversely switched dynistor）, we researched the multi-cell parallel technology,and established RLC equations of the main circuit and the triggering circuit with the plasma bipolar drift model of RSD . The RSD current waveforms of two parallel branches were acquired by iterative calculation with the fourth order Runge-Kutta method. On certain simulation conditions, the current unbalance rates caused by different RSD device parameters and different branch resistance were 3.56% and 19. 82 %, respectively, in the parallel experiments of RSD, the current unbalance rates＇ caused by the shunt with the resistance of 1. 642 mΩ and the asymmetric connection were 12.82% and 20.71%. The great current turn-on experiment was carried out on the two RSD stacks in parallel of 45mm diameter at the main capacitance of 3000 μF and the main voltage of 2 kV. The peak current of 32. 700 kA was obtained at the pulse width of 330μs. Both the simulation and experimental results show that the current distribution between parallel branches is mainly decided by the circuit parameters in high power and high speed turn-on process. The influence of the dynamic resistance of RSD is not remarbale.