Investigation of the Effect of Different Electromagnetic Interference Filter Topologies to DC-DC Boost Converter for Continuous Conduction Mode

Abstract

This paper presents the design and application of boost converter operated in continuous conduction mode for 15 W, with 25 kHz switching frequency with induc tor-capacitor-inductor (LCL), pi, inductor capacitor (LC) with damping, and LC electromagnetic interference filters. Also, modeling and analysis of the boost converter in terms of state space and small signal are given. Furthermore, the effect of each filter to differential mode (DM) noise and to control characteristics by root locus and bode diagrams for the boost converter are presented, which is not presented in detail in the literature for the boost converter. All results obtained by applications and simulations are compared. Moreover, frequency spectrums are given to compare DM noises. As a result, for control point of view, LCL filter provides better results, and for reducing DM noise, the LC and pi filters are superior to others. Besides, the LCL filter reduces the inductor value by 30% compared to other filters.