As NEVs grow, the new demand for on-board power systems also increase. Compared with gasoline-powered cars, NEVs are equipped with high-voltage power battery packs and need to supply power to on-board low-voltage electrical appliances. The on-board DC/DC converter enables high-to-low voltage conversion, and is an indispensable key component in the NEV electrical system. The use of SiC devices in DC/DC converters can achieve high voltage and temperature tolerance, high current, low loss and high precision performance, which can meet the needs for high output and miniaturization of DC/DC converters.