Design of a SiC-Based Switched CCM/TCM Inverter for High-speed Machine Drive with Low PWM-Induced Current Ripple

Abstract

This paper presents the design of a SiC-based inverter for high-speed machine using a continuous conduction mode (CCM) and triangular conduction mode (TCM) switched switching scheme. The implementation of the switched TCM and CCM on machine drive are explored analytically in the context of PWM-induced current quality and efficiency, based on which, an improved switched switching strategy is employed. According to the difference in uneven current ripple distribution of TCM and CCM, the proposed strategy alternates between TCM and CCM in one line cycle for an enhanced current ripple and efficiency performance.