Configurable power supply system

A power supply system arranged to be incorporated in an aircraft by being connected to at least one AC voltage source and to at least one electrical system presenting electricity consumption that depends on the aircraft's flight phase and/or altitude, the power supply system comprising:

• a first converter module comprising an AC/DC converter and being arranged to produce an intermediate voltage from an input voltage produced by the AC voltage source;
• a second converter module comprising a DC/DC converter and being controllable to use the intermediate voltage to produce selectively at least two distinct output voltage levels;
• and
• a control unit arranged to acquire a flight parameter representative of the flight phase and/or of the altitude, and to control the power supply system in such a manner that the second converter module delivers to each electrical system a power supply voltage that depends on the flight parameter and on said electrical system, and that is equal to one of the output voltage levels.