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压接式IGBT器件动态特性测试平台的杂散电感对于开关特性影响很大,准确提取测试回路中的杂散电感对于分析器件的开关特性非常关键。由于换流回路中存在二极管以及电阻,传统的杂散电感提取方法在提取杂散电感的过程中忽略了这些非线性电阻的影响,从而影响了计算结果的准确性。通过假设IGBT关断和下一个开通瞬态过程中,直流母线电压以及负载电流不变,提出同时采用关断和开通瞬态的电流、电压波形来提取杂散电感。这种方法消除了回路中非线性电阻的影响。为了验证这种方法的准确性,用Synopsis Saber软件进行了电路仿真分析;同时,搭建了压接式IGBT动态特性测试平台,在不同电压、电流等级条件下进行了开关特性测试以及杂散电感提取。仿真和实验结果验证了所提方法的正确性。
The stray inductance of the crimp-type IGBT device dynamic test platform has a great influence on the switching characteristics. Accurately extracting the stray inductance in the test circuit is crucial for analyzing the switching characteristics of the device. Due to the presence of diodes and resistors in the commutation loop, traditional stray inductance extraction methods neglect the influence of these nonlinear resistors in the extraction of stray inductances, thus affecting the accuracy of the calculation results. By assuming that IGBT turn-off and the next turn-on transient process, the DC bus voltage and load current remain the same, it is proposed to extract the stray inductance by using the current and voltage waveforms of turn-off and turn-on transient simultaneously. This method eliminates the effect of non-linear resistance in the loop. In order to verify the accuracy of this method, the circuit simulation was carried out by Synopsis Saber software. At the same time, a test platform for the dynamic characteristics of the crimp IGBT was built. The switching characteristics and stray inductance were tested under different voltage and current levels . Simulation and experimental results verify the correctness of the proposed method.