Three-phase boost converter with integrated auxiliary step-up circuit for electric vehicle applications

This paper proposes a novel three-phase interleaved high step-up converter suitable for electric vehicle applications. By integrating an auxiliary circuit, the proposed three-phase converter can achieve a higher voltage-boosting ratio than that of the conventional boost converter and possess lower duty cycle, leading to significantly reduced diode reverse recovery, voltage ratings of power devices and energy volumes of most passive components. Besides, interleaved feature of the proposed converter provides the lower input current and output voltage ripples. The operating principle and steady state analysis for the proposed converter are presented and discussed in this paper. Finally, simulation and experimental results of a laboratory prototype are provided to verify the feasibility.