Power modules (such as IGBT and SiC devices) are the core components of rail transit systems, which are widely used in traction converters, auxiliary power systems, energy feedback systems and other key links. The following are the main applications and technical trends of power modules in rail transit. Traction converters are the core components of rail transit vehicles, which are responsible for converting alternating current or direct current from the grid to the voltage and frequency suitable for traction motors.