Characteristic Analysis of Three-Phase Interleaved Staggered Parallel DCDC Converter for Electric Vehicle

Recently, meanwhile the electric vehicle industry is increasingly becoming the focus of attention, the performance of power electronic switching devices needs to be continuously improved. The DC/DC converter's complex structure makes it difficult to establish a mathematical analysis model and ensure controllability in the face of perturbations. The device experiences high voltage stress and current stress, with a slow response speed. The article presents a method for analyzing challenges using block diagram transformation. The article analyzes in detail the operation of DC/DC converter in three-phase staggered parallel structure. It explores the transfer function of the converter using block diagram analysis to establish a mathematical model. It also introduces PI control, which involves a double closed loop of voltage and current, containing voltage feedforward. The theoretical analysis results were finally confirmed through experimental verification using Matlab/Simulink simulation software. The platform compares the system output regulation and current equalization ability under different single-phase and three-phase situations. It has been confirmed that the converter responds rapidly under a three-phase interleaved parallel connection, and the ripple rejection performance has been significantly improved, leading to the suppression of both input current ripple and output voltage ripple.