脉冲大电流工况下晶闸管反向恢复过程建模研究  

Research on Modeling of Thyristors Reverse Recovery Process under Pulsed High Current Conditions

作　　者：沙新乐 张桂林 李蕊 彭定康 Sha Xinle;Zhang Guilin;Li Rui;Peng Dingkang(Wuhan Institute of Marine Electric Propulsion,Wuhan 430064)

机构地区：[1]武汉船用电力推进装置研究所,武汉430064

出　　处：《船电技术》2021年第3期43-45,48,共4页Marine Electric & Electronic Engineering

摘　　要：为了探究脉冲大电流工况下,晶闸管的反向恢复特性并建立能够准确反映晶闸管反向恢复过程的数学模型,首先搭建试验回路,依次探究了正向电流峰值IF、关断电流变化率di/dt对晶闸管反向恢复过程中电流变化的影响。结果表明,当正向导通电流峰值IF达到一定值后,载流子的存储趋于饱和,对反向恢复过程中电流的变化无明显影响,关断电流变化率di/dt才是影响晶闸管反向恢复过程中各参数变化的主要因素。在此基础上采用曲线拟合的方法建立了基于双曲正割函数的晶闸管反向恢复模型。通过四种不同条件下仿真和试验电流、电压波形的对比,验证了仿真模型的准确性。In order to investigate the reverse recovery characteristics of the thyristor under pulsed high current conditions and establish a mathematical model that can accurately reflect the reverse recovery process of the thyristor,a test loop is established to study the influence of the forward current peak value IF and the turn-off current change rate di/dt on the current change during the reverse recovery process of the thyristor.The results show that the storage of carriers tends to be saturated and there is no obvious influence on the current change during the reverse recovery process when the peak forward current IF reaches a certain value.It is also observed that turn-off current change rate di/dt is the main factor affecting the change of thyristor parameters during the reverse recovery process.According to the above analyses a thyristor reverse recovery model based on the hyperbolic secant function is established using the curve fitting method.Finally,The comparisons of current and voltage waveforms under four different conditions by PSCAD simulation and experiments are introduced,which proves the accuracy of the simulation model.

关 键 词：晶闸管 脉冲 反向恢复 双曲正割函数 

分 类 号：TN34[电子电信—物理电子学]