A power supply unit comprises at least one first converter unit and a second converter unit. The at least one first converter unit is controlled with a first controller and supplies at a first output at least one of a first output voltage that is regulated using a first voltage regulator and an output current that is regulated using a first current regulator. The second converter unit is controlled by a second controller and supplies at a second output at least one of an output voltage that is regulated using the second voltage regulator and an output current that is regulated using a second current regulator. The first and second outputs are connected in parallel for providing a higher output power, and at least one controller includes a supervision unit for recognizing an output-side parallel connection.