Open AccessAnalysis of time‐frequency characteristic parameters of electromagnetic interference sources in the basic commutation unit
Author(s) -
Hao Bin,
Peng Cheng,
Tang Xinling,
Zhao Zhibin
Publication year - 2022
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/pel2.12403
Subject(s) - emi , electromagnetic interference , waveform , commutation , insulated gate bipolar transistor , electronic engineering , common mode signal , conducted electromagnetic interference , transient (computer programming) , engineering , control theory (sociology) , electrical engineering , computer science , voltage , control (management) , digital signal processing , artificial intelligence , analog signal , operating system
Establishing accurate electromagnetic interference (EMI) sources of the basic commutation unit is the key to accurately predicting the EMI of the converter equipment. To compensate for the insufficiency of the reported works, that is to use asymmetric trapezoidal waveforms (ATW) as common mode (CM) and differential mode (DM) EMI sources, this paper analyzed the switching transient process of insulated gate bipolar transistor (IGBT) device in the basic commutation unit, and then proposed the equivalent waveform of EMI sources with multi‐polylines‐damped oscillation waveform (MP‐DOW). The spectrum envelop characteristic parameters of MP‐DOW were obtained by the frequency domain analysis method, and its correctness was experimentally verified. Comparison with the reported works shows that the proposed spectrum envelope of MP‐DOW can take into account the voltage and current overshoot during the switching transients of IGBT devices, and the spectrum characteristic parameters are more accurate. This paper is beneficial to the prediction of EMI for the converter already in operation, and can also provide theoretical guidance for the converter to be designed in conjunction with the analytical formula of the EMI source.