Cascadable synchronous drive circuit for voltage controlled thyristor
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摘要: 针对压控晶闸管脉冲工作特性和串联使用需求,设计了一种可级联的驱动电路,实现了多级串联压控晶闸管的同步开通。首先,介绍了电路拓扑及工作原理,利用推挽结构的平面耦合电感器隔离初、次级信号并传递驱动能量,解决了串联驱动小型化和低压供电条件下快前沿输出的问题;其次,通过计算和仿真确定了电路参数和主要器件选型;最后,使用6级串联的MCT作为放电开关搭建了测试电路,在充电电压8.4 kV、工作重复频率20 Hz条件下,4 Ω电阻负载上获得了幅值为1.958 kA的准方波脉冲电流。Abstract: Aiming at the pulse operating characteristics of voltage-controlled thyristors, a cascadable driving circuit is designed to realize the synchronous opening of multi-stage series-connected voltage-controlled thyristors. Firstly, the circuit topology and working principle is analysed. in which the coupled inductor is used to isolate the driver signal and transfer power to open the switch. Based on Blumlein PFN, an experimental test circuit is built, in which a 6-stage MOS-controlled thyristor is series connected to be the discharge switch. A quasi-square-wave pulse current with an amplitude of 1.958 kA is obtained on a 4 Ω resistor.
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Key words:
- driver circuit /
- MOS-controlled thyristor /
- series connection /
- synchronization /
- quasi-square pulse
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表 1 耦合电感器参数
Table 1. Parameters of coupling inductor
L(P1)/nH L(P2)/nH L(S1, S2)/nH Lm(P1-S1, S2)/nH Lm(P2-S1, S2)/nH 173 139 639 233 203 -
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