压接式IGBT动态测试平台杂散电感的提取（英文）

Extraction of Stray Inductance in Press Pack IGBTs' Dynamic Testing Platform

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。

Stray inductance of press pack IGBTs＇（PPIs） dynamic testing platform has great influence on dynamic test results. Thus, the stray inductance needs to be measured and calculated accurately. Conventional method cannot extract stray inductance accurately due to existence of nonlinear resistance in current path. Hence, a new method was proposed in this paper to extract stray inductance based on turn-off transient waveform and the following turn-on transient waveform. In this method, it was assumed that capacitor voltage and load current were constant during turn-off transient and the following turn-on transient, and then the stray inductance was extracted accurately by using gradients of both turn-off current and turn-on current at a given current value. This method eliminates the influence of nonlinear resistance in current path. To verify the proposed method, circuit simulation was carried out by using Synopsys Saber; furthermore, a dynamic testing platform was developed, and stray inductance of the testing platform was extracted under different voltage level. Simulation and measurement results prove the effectiveness of the new method.