Development of On-Board Power Supply Based on 800V SiC

This paper studies the basic principle of on-board charger for electric vehicle, and proposes a three-in-one on-board charger based on function integration. First, the system architecture design was completed according to requirements of the mass-produced models, and the hardware architecture and software function planning were determined. The software architecture is designed according to AUTOSAR to adapt to the trend of distributed and rapid iteration. Finally, complete the structural layout design to ensure good heat dissipation, high strength, and convenient installation and use of the whole vehicle. In order to verify the design, a prototype was trial-produced and tested on a mass-production platform. Through the bench test verification, the OBC efficiency exceeded 95%, and the DCDC weighted efficiency reached 92.1 %.