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晶闸管虽然通流能力强,但是耐压普遍不高,为了实现晶闸管的串联使用,利用MOSFET的快导通和通流能力强的特性,搭建了一套能够实现光纤控制多只晶闸管同步导通的强触发平台。以4只2.5 kV耐压晶闸管串联为例,在实验平台上研究了触发电流峰值和前沿对晶闸管导通特性的影响,提出了间接光触发系统的设计结构和晶闸管同步性实验的一般性方案。实验结果表明:在工作电压确定的情况下,晶闸管的触发时延与门极触发电流有关,触发电流的峰值越大,前沿越陡,导通越快,触发时延越小;触发时延是可控的,可以通过调整触发电流对串联的各晶闸管进行阶梯型串联实验,逐步调整时延参数并实现4只晶闸管串联的同步强触发导通(对于微秒级导通过程,触发的同步性控制在30 ns以内)。改进后的间接光触发系统和强触发技术,能有效地改善晶闸管的导通特性和同步性,对扩大晶闸管在脉冲功率中的应用具有重要意义。
Although thyristor flow through the strong, but the pressure is generally not high, in order to achieve the thyristor in series, the use of MOSFET fast turn-on and flow through the strong ability to set up a set of optical fiber can control more than synchronous thyristor conduction Strong trigger platform. Taking the 4 2.5 kV thyristors in series as an example, the effect of the peak and leading edge of the trigger current on the conduction characteristics of thyristors was studied on the experimental platform. The general scheme of the experimental design and thyristor synchronization of the indirect light triggered system was proposed. The experimental results show that the trigger delay of the thyristor is related to the gate trigger current under the condition of the operating voltage. The larger the peak value of the trigger current, the steeper the front, the faster the conduction, the smaller the delay. The trigger delay is Controllable, you can adjust the trigger current thyristor series connected in series ladder experiments, and gradually adjust the delay parameters and achieve thyristor series 4 strong synchronous trigger (for the microsecond conduction process, the trigger synchronization Control within 30 ns). The improved indirect light triggering system and strong triggering technology can effectively improve the conduction characteristics and synchrony of thyristors, which is of great significance for expanding the application of thyristor in pulse power.