Research on the Principle and Implementation Method of Parasitic Parameter Extraction Based on Switching Transient High-frequency Oscillation Characteristics
Parasitic parameter extraction is of great significance for enhancing the operational safety and optimizing the efficiency of power electronics equipment.This paper proposes a parasitic parameter extraction method based on high-frequency oscillation characteristics during switching transient.Compared with the existing method using the voltage and current change slope during switching transients,parameter extraction based on oscillation characteristics has lower requirements on the waveform amplitude measurement and channel sampling synchronization,so it is more robust to issues such as the signal attenuation and latency.In this paper,the oscillation excited by turn-off transient is firstly deduced mathematically in detail,and the frequency-based analysis method is formed.Next,the oscillation behavior for both second-order and fourth-order circuit are discussed.Then,the hardware design,the algorithm evaluation scheme and the error analysis of the extraction kit based on high-speed power devices are given.Finally,the proposed method is carried out with the typical components in the power electronics commutation loop,such as copper busbar,laminated busbar,DC-link capacitor,and semiconductor power module.The test result shows that the proposed method can extract parasitic parameters on the order of 10 nH,and it possess the advantages in high test consistency,simple operation and low extraction error.
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