Analysis of impacts of component tolerance and parasitic effects on high frequency power converter performance and its electromagnetic emission

Abstract

The High Frequency Switched Mode Power Supplies (SMPS) newlineprovide high-efficient and high-power density solutions in which the high newlinefrequency devices such as MOSFETs are used as primary power switching newlinecomponent. The parasitic elements associated with power converter newlinecomponents and tolerance of the components used for associated measurement newlinecircuits produce undesirable effect on Electromagnetic Emission and newlineMeasurement accuracy. This research works aims to analyze and control the newlineeffects of Component parasitic elements in Electromagnetic Emission and newlineeffects of gain resistor tolerances in current measurement circuit which is used newlinefor Non-Synchronous Buck Converter application. In order to mitigate the newlineElectromagnetic Emission, there are different types of Electromagnetic Noise newlinereduction techniques are available. Among them EMI filter implementation, newlineaddition of Snubber circuits, optimizing the printed circuit board layout using newlineintegrated module-based solutions instead of discrete power converter newlinesolutions and frequency modulations techniques are the most widely used by newlinethe circuit designers. But, all above mentioned techniques required newlineimplementation of additional circuit elements or modification of existing newlinecircuit topology with increased cost and design complexity. newlineThe proposed work focused on controlling the Electromagnetic newlineEmission level by optimal selection MOSFET parasitic capacitance without newlineaddition of any extra circuits or software-based control techniques. In order to newlinevalidate the proposed concept, the non-synchronous buck converter hardware newlineis designed and validated with dissimilar kind of MOSFETs which have newlinedifferent parasitic specifications. newline