Modeling and Analysis of Input L-C Filter for Buck Converter

Modeling, simulation and analysis are presented of the input L-C filter for buck converter in detail. The input current of the buck circuit is intermittent, so it is necessary to add an L-C filter to make the current passing through the switch continuously, which is helpful for the design of sampling and control. The state average method is used to model and analyze the input LC-buck circuit. Simulations carried on PSIM software to analyze and validate theoretical models. The simulation results are consistent with the theoretical analysis.