Comparison of phase-leg circuits for cryogenic operation in the all-electric aircraft

A. El-Wakeel, Z. Feng, N. McNeill, R. P. Alzola, M. Zhang, W. Yuan

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

2 Citations (Scopus)
32 Downloads (Pure)


Commercial all-electric aircraft are projected to be flying as early as 2035, where hydrogen is selected to supply fuel and coolant. The cryogenic aircraft's powertrain includes the turbines, generators, power electronics and fan motors. As most of the powertrain is located at cryogenic temperature, it is preferable to co-locate the power electronics in the same region to reduce the engineering system's complexity. Silicon super-junction MOSFETs are known for their high efficiency, thus lower cooling requirements at cryogenic temperature. However, in phase-leg circuits, the behaviour of the MOSFET's intrinsic diode, and its output capacitance are challenging. These issues can be addressed by using the MOSFET with ancillary power devices to realise diode deactivation. This paper compares different permutations of intrinsic diode deactivation devices at room temperature and cryogenic temperature. The paper presents a demonstrator phase-leg built with different ancillary power devices. It is operated from a DC voltage of 270 V, and supplies a phase current of up to 10 A.
Original languageEnglish
Title of host publication11th International Conference on Power Electronics, Machines and Drives (PEMD 2022)
Place of PublicationPiscataway, NJ
Number of pages8
ISBN (Electronic)9781839537189
Publication statusPublished - 29 Aug 2022


  • cryogenics
  • power electronics
  • superjunction MOSFET
  • electric vehicles
  • power convertors
  • power MOSFET
  • power semiconductor diodes
  • power transmission (mechanical)


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