Thales

Francis Blanchery

Christophe Bruzy

Gérard Monroy

The invention relates to the electrical power supply of aircraft and notably of large commercial aircraft. According to the invention, the aircraft is equipped with an AC-DC converter that distributes power over a DC network starting from a three-phase alternating voltage of 230 volts applied to its main inputs (E, E, E). The converter comprises an autotransformer which preferably has nine outputs (A, A, A, B, B, etc.) for a nine-phase rectification. These outputs are applied to a rectifier bridge with 18 diodes. When the aircraft is on the ground, the AC power is delivered at 115 volts from a ground generator; it is applied via a three-phase connector (CAUX) to auxiliary inputs (M, M, M) connected to intermediate taps of the three-phase windings forming the AC-DC converter.

AC/DC converter for aeronautics

The invention relates to an autotransformer for transforming a three-phase power supply into a nine-phase power supply, notably for use in a rectifier. The autotransformer is a, step-up or step-down transformer. For a step-down application, the three-phase input terminals E, E, E. are connected to one of the three main windings in delta configuration, mounted on respective magnetic branches M, M, Mof a magnetic circuit. Te main winding Bof one branch has intermediate taps K, K', K&#x2033;from which auxiliary windings X, Y, Z, mounted on the other branches, start. These auxiliary windings produce, on three output terminals A, B, C, voltages one of which is in phase with the three-phase supply voltage at E, the other phase-shifted by +40&#xb0;, and the third by +80&#xb0;. The number of turns in the auxiliary windings and the position of the intermediate taps are calculated so as to obtain this result. The identical windings of the other branches produce the other output voltages on the terminals A, B, C, A, Bin order to produce a system with nine phases.

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Chatou, France

Francis Blanchery