脉冲功率晶闸管反向恢复特性

发布时间：2019-07-31 14:10

【摘要】：为建立有效的晶闸管模型来仿真晶闸管关断时过电压,减小晶闸管过压损坏的概率,以最大通流150kA、耐压5.2kV的脉冲晶闸管为研究对象,将其前置于脉冲形成单元回路中作为大功率开关使用,记录放电过程中晶闸管两端电压及电流。实验数据表明:恢复过程中的电流下降率、反向恢复电荷、反向恢复电流峰值随通态电流峰值的增大而增大,晶闸管关断时间随通态电流峰值的增大而减小。此外,在关断过程中,当电流下降率在-50~1000A/μs时,电流下降率与电流峰值为线性关系。因此,在大脉冲电流条件下,推导反向恢复过程参数与通态电流参数的关系时电流下降率可用与电流峰值的线性关系代替。基于Matlab仿真平台,建立了具有反向恢复过程的脉冲晶闸管模型。该模型仿真得到的晶闸管反向恢复电流峰值与实测结果较为吻合,反向恢复电压尚待进一步修正。
[Abstract]:in order to establish an effective thyristor model to simulate the overvoltage of the thyristor when the thyristor is turned off, the probability of the overvoltage damage of the thyristor is reduced, a pulse thyristor with a maximum flow capacity of 150 kA and a voltage of 5.2 kV is used as a research object, and a front part thereof is arranged in a pulse forming unit loop for use as a high-power switch, The terminal voltage and current of the thyristor during the discharge process are recorded. The experimental data show that the current drop rate, the reverse recovery charge and the reverse recovery current peak in the recovery process are increased with the increase of the peak of the on-state current, and the turn-off time of the thyristor is reduced with the increase of the peak of the on-state current. In addition, in the off-process, when the current drop rate is between-50 and 1000 A/. m, the current drop rate is linearly related to the current peak. Therefore, under the condition of large pulse current, the relationship between the reverse recovery process parameter and the on-state current parameter is derived, and the current drop rate can be replaced with the linear relationship of the current peak value. Based on the Matlab simulation platform, a pulse thyristor model with reverse recovery process is established. The peak of the reverse recovery current of the thyristor is in agreement with the measured result, and the reverse recovery voltage has to be further corrected.
【作者单位】：华中科技大学强电磁工程与新技术国家重点实验室;
【基金】：国家高技术发展计划项目
【分类号】：TN34

【相似文献】