The power converter for more electric engine in aircraft requires high power density, which makes SiC extremely attractive for this application. In this work, a 50 kW SiC high power density converter with the topology of three-phase two-level voltage source inverter is developed. Meanwhile, an accurate mathematical model for the power loss and efficiency calculation is proposed, which is based on the experimental results of switching characterization. The prototype presented in this work shows an efficiency up to 97.77% at 50 kW input power and 60 kHz switching frequency. And it matches well with the result predicted by model.