Airplane Transformer. The power converter can be as simple as a transformer or it can be a far more complex system such as resonant converter so 50 Hz or 60 Hz to 400 Hz frequency conversion is needed for use in the ground power unit used to power the airplane while it is on the ground Conversely internal 400 Hz internal power may be converted to 50 Hz or 60 Hz for convenience power.
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Lego Moc Transformer Jet Plane From Lego Creator Set 31058 By Alanyuppie Rebrickable Build With Lego
Electric power conversion Wikipedia
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