The Characteristic Research of Multi-Phase Interleaving Buck-Converter for High Efficiency and Low Ripple for Green Car or Light System

Abstract

A step-down non-isolated Buck converter is a common and basic topology in the field. We analyzed the Characteristic of Multiphase Interleaved Buck Converter in DCM(Discontinuous Current Mode) and CCM(Continuous Current Mode) for law ripple and high efficiency1). Multiphase buck converter has more advantages than other topology. Input current of converter is divided into each converters because of the structure. it has features of decreasing input current ripple and increasing efficiency of converter. So we can reduce the size of Capacitor and Inductor2). It means that the size of system is also reduced3). The Time Reverse Recovery loss of diode was also affected4)5), the TRR loss was confirmed to be negligible in the 120kHz 8 Phase case despite the CCM situation. In this study, the effects of the loss factors were analyzed on the efficiency of the multiphase interleaving buck converter in DCM and CCM, and it would be helpful to design a more efficient converter by effectively controlling the factors of each loss. At least, we tested the performance of the analyzed system with PSpice.