A High Efficiency 750 V/ 100 A Cryogenically Cooled Solid State Circuit Breaker Module for Aviation Applications

A solid-state circuit breaker (SSCB) needs to have very high efficiency comparable to its mechanical counterpart, and GaN offers highest conduction loss reduction at cryogenic temperatures. So, cryogenic cooling of future EAP is leveraged to design a 750V/100A SSCB module with an efficiency target higher than 99.9% and high over-current capability. The cryogenically cooled SSCB module design is developed in this paper, including key components selection and module design considerations. Experimental results are provided to validate the capability of the designed SSCB module to interrupt 10x of rated current at cryogenic temperatures (<-153°C).