Ac/Dc Conveter for Aeronautics

An AC-DC converter, designed to be connected by three main inputs to a supply of three-phase voltage of given amplitude Va, comprising an autotransformer with three main inputs (E1, E2, E3) and more than three outputs (A1, A2, A3, B1, etc.) and a rectifier bridge with more than three phases connected to the outputs of the autotransformer, the autotransformer comprising a magnetic core with three branches (M12, M23, M31) and on each branch a main winding (B12, B23, B31) and auxiliary windings (X12, X23, X31, etc.), the auxiliary windings of one branch being electrically connected at one end to terminals of the main windings of this branch or of another branch and at the other to a respective output of the autotransformer, all of the connections exhibiting a circular permutational symmetry allowing a balanced three-phase operation, this converter being characterized in that it comprises three auxiliary power supply terminals (M1, M2, M3), each one on a respective winding according to a three-phase permutational symmetry, at a location where the amplitude of the voltage is Va/g when the power supply voltage present on its main inputs is Va, and in that these three auxiliary power supply terminals (M1, M2, M3) are connected to a three-phase connector (CAUX) in order to form an auxiliary three-phase input allowing AC electrical power to be occasionally received at a voltage Va/g of different amplitude from the amplitude Va to be applied to the main inputs.