脈沖功率晶閘管反向恢復特性
[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.
【作者單位】: 華中科技大學強電磁工程與新技術(shù)國家重點實驗室;
【基金】:國家高技術(shù)發(fā)展計劃項目
【分類號】:TN34
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