Analysis and control of EMI events in automotive DC DC buck converter by considering parasitic effects

Abstract

The ever-increasing deployment of electronic components in newlinemodern automobiles has raised concerns regarding electromagnetic newlineinterference (EMI), a disruptive phenomenon that can significantly impact the newlineoperation of power electronic circuits (PECs) and potentially cause system newlineinstabilities. Common mode (CM) currents, frequently generated by switching newlinebuck converters, are a major contributor to EMI in automotive environments. newlineTo effectively address this issue, this research work is divided into three newlinemethods. The first method presents a novel conducted emission mitigation newlinetechnique specifically designed for DC-DC buck converters. newlineThe proposed technique employs a comprehensive approach that newlinecombines two distinct filtering techniques: an input EMI filter (EMI-F) and newlineRF inductors (RF-I) along with Fuzzy Logic Control (FLC) to minimize newlineelectrical stresses during switching events. The EMI-F is strategically newlinepositioned at the input of the buck converter to attenuate high-frequency noise newlinecomponents, effectively suppressing EMI at higher frequencies. Additionally, newlineRF-I are strategically placed to effectively suppress lower-frequency noise newlinedisturbances, ensuring comprehensive EMI mitigation across a wide newlinefrequency range. Furthermore, FLC is implemented to dynamically regulate newlinethe switching process, thereby minimizing the generation of EMI-causing newlinetransients. This intelligent control mechanism ensures that the buck converter newlineoperates under optimal conditions, reducing EMI generation while newlinemaintaining high efficiency. newline