Abstract
In EMU emergency supply converters, the rapid current change rate interacts with the stray inductance of the commutator loop, creating non-ideal electrical stresses and worsening system EMI. In order to analyze and improve the system performance, it is necessary to accurately extract the stray inductance of the commutation circuit. Traditional measurement methods have some problems, such as high measurement cost and sensitivity to current waveform, etc. Taking SiC devices as an example, based on analyzing the mechanism of SiC MOSFET cut-off voltage overshoot, this paper proposes an inductance extraction method of converter loop based on voltage overshoot. This method only needs to measure the voltage of the power device and the external inductance to solve the equations to get the loop inductance. Finally, a double-pulse test platform is built to compare the extraction method of stray inductance with other existing methods, which verifies the accuracy and effectiveness of the proposed method.
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Acknowledgements
The authors gratefully acknowledge the financial support from Technical Research Projects 1950ZH2101 and 20ZHWF0147 of Beijing Zongheng Electromechanical Technology Co., Ltd.
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Song, S., Zhu, Y., Liu, B., Qiu, T., Chen, Y., Diao, L. (2021). An Inductance Extraction Method for SiC Converter Loop of EMU Emergency Self-Running Supply. In: Ma, W., Rong, M., Yang, F., Liu, W., Wang, S., Li, G. (eds) The Proceedings of the 9th Frontier Academic Forum of Electrical Engineering. Lecture Notes in Electrical Engineering, vol 742. Springer, Singapore. https://doi.org/10.1007/978-981-33-6606-0_27
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DOI: https://doi.org/10.1007/978-981-33-6606-0_27
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