Ultra-Fast Response Bidirectional SiC-SSCB for Fault Protection in 800V DC Aircraft Grids

The transition to electric propulsion in aircraft introduces unique challenges for power distribution and protection systems, necessitating advancements in technologies such as solid-state circuit breakers (SSCBs). This paper examines the critical role of SSCBs in electric aircraft, emphasizing their potential to enhance safety, reliability, and efficiency in 800V high-power applications. However, their implementation in aviation presents significant challenges, including ultra-fast fault isolation within complex electrical architectures, efficient thermal management, improved reliability and safety, and the need for lightweight, compact designs. This work addresses these challenges by analyzing existing technological limitations, exploring potential solutions, and presenting experimental results from a bidirectional silicon carbide (SiC) SSCB that successfully detects a 1kA fault current with a response time below 1µs. The findings underscore the necessity for continued innovation in SSCB technology to meet the rigorous demands of next-generation electric aircraft.