High-Frequency SiC-Based Medium Voltage Quasi-2-Level Flying Capacitor DC/DC Converter With Zero Voltage Switching

This paper presents a medium voltage (1.5 kV) flying capacitor DC/DC converter rated at 30 kW. The fast switching 1.2 kV/11 mΩ SiC MOSFETs converter operates in quasi-2-level (Q2L) mode at high frequency (100 kHz) to obtain a low size of the flying capacitor (330 nF). Moreover, a novel switching pattern is introduced and ZVS at turn-on is also enabled. Such control method leads to lower switching losses, higher switching frequency and minimized inductor volume compared to more conventional topologies. Presented experimental results prove correct operation of the proposed converter and control method.