Research on the selection and application of traction-grade all-SiC power devices for rail transit

CRRC Corporation Limited (CRRC) has released a 3300 V high-voltage all-silicon carbide (SiC) power device product based on planar gate technology, targeting applications in rail transit and other fields. This paper provides a detailed introduction to the selection of chip types, key processes and technologies, as well as device packaging techniques, such as low inductance design, high temperature reliability, and thermal design. It also presents reliability evaluations and research focused on on-board applications for rail transit. The research results demonstrate that the launched product aligns with mainstream products on the market in performance, and exhibit obvious advantages over IGBT devices in applications. The product can significantly reduce the weight and volume of traction converters, effectively lower system losses, improve system efficiency, and decrease motor temperature rise and noise.