Power Electronics for Aerospace
Technical Lecture Session
Transportation Power Electronics I
fcml, flying capacitor, multi-level, multilevel, electric aircraft, drives, inverter, specific power, ev, powertrain
For more-electric aircraft, power electronics efficiency and power density (kW/kg or kW/L) must drastically increase through 2025 and beyond. Unconventional topologies can attain high-performance and system level benefits- such as reduced output current distortion, dv/dt and filter size. This work uses the flying capacitor multilevel topology (FCML) in a high-power, high-voltage, gallium nitride (GaN)-based inverter. Design considerations, thermal management, and startup and steady-state operation are presented. A 10-level prototype FCML inverter is used to demonstrate operation at 1 kV dc input voltage and 13.4 kW peak output power, with 26.7 kW/kg and 17.4 kW/L power densities.