LLC resonant converter has become a popular topology for DC-DC converters because of its soft switching characteristics. It has many advantages such as high efficiency, high power density, and low noise. The traditional Si MOSFET LLC resonant converter cannot continue to improve due to the limitations of the Si characteristics in terms of frequency and efficiency. This article explores the advantages of SiC MOSFET in LLC resonant converter, and compares the conversion efficiency for trench-gate SiC MOSFET, planar-gate SiC MOSFET and Si MOSFET.