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With the continuous improvement of the switching frequency of power electronic devices, the stray inductance parameters in the converter circuit and the di/dt caused by the rapidly changing current cause large voltage spikes at both ends of the switch tube. Once the rated value is exceeded, the irreversible breakdown of the IGBT will be caused. At the same time, the high-frequency stray parameters also introduce large high-frequency noise, which is detrimental to the output performance. Therefore, it is necessary to extract the line stray parameters through the analysis of the IGBT switching process. The traditional extraction method regards the current change rate near the moment of the maximum peak voltage Ucemax as a fixed value, and calculates the stray inductance value using the voltage-current relationship, but its extraction accuracy is not high. This paper focuses on the overall stray parameters of the inverter system and considers that the di/dt is constantly changing during the switching process. The switching time period applicable to the extraction of stray parameters is analyzed and obtained. The stray inductance value of the converter circuit is obtained by the method of parameter fitting, and the accuracy of the parameter extraction method is verified by simulation.
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