Design and Evaluation of SiC Active Soft-Switching Cell for 1-ph/3-ph Universal Voltage Input PFC for On-Board Charger Applications

摘要

A detailed analysis and experimental evaluation of a continuous-conduction-mode (CCM), pulse-width-modulated (PWM), boost-type active soft-switching cell suitable for 1-ph/3-ph universal-voltage-input PFC for on-board charging (OBC) applications is introduced. The soft-switching cell features zero-voltage switching (ZVS) of all switches, reduced reverse-recovery loss at any operating point, and simple control. The cell achieves high efficiency for converting low line voltage to the high dc-link voltage required for the OBC dc-dc converter. The evaluation of the concept was performed on a single-phase leg 3.4 kW prototype designed to operate at 220 VRMSline input and deliver 650 V output. The prototype achieves 97.8% efficiency at full load and 100 kHz switching frequency. The soft-switching PFC rectifier concept naturally morphs between an interleaved totem-pole converter for 1-ph ac line voltage and a 3-ph converter for 3-ph ac line voltage.