Power supply unit

1. A power supply unit, comprising:

an output configured to deliver an output current and an output voltage; and

a protective element having a signal output path, wherein the protective element is connected downstream of the output and is configured to maintain the signal output path when the output current exceeds a first amplitude threshold value and to interrupt the signal output path when the output current exceeds a second amplitude threshold value, the second amplitude threshold value being higher than the first amplitude threshold value,

wherein the power supply unit is configured to reduce an amplitude of the output voltage and to increase an amplitude of the output current above the second amplitude threshold value, in order to interrupt the signal output path when the output current exceeds the first amplitude threshold value.

2. The power supply unit according to claim 1 , wherein the power supply unit is configured to increase the amplitude of the output voltage following the reduction when the amplitude of the output current is below a third amplitude threshold value following expiration of a predetermined time interval.

3. The power supply unit according to claim 1 , wherein the power supply unit is configured to again reduce the amplitude of the output voltage when the amplitude of the output current is above the third amplitude threshold value following expiration of the predetermined time interval.

4. The power supply unit according to claim 1 , further comprising a measuring device configured to measure the amplitude of the output current.

5. The power supply unit according to claim 1 , further comprising a control device configured to set the amplitude of the output current or of the output voltage.

6. The power supply unit according to claim 1 , wherein the protective element comprises a line circuit breaker with electromagnetic triggering.

7. The power supply unit according to claim 1 , wherein the protective element comprises a melting fuse.

8. The power supply unit according to claim 1 , wherein the protective element comprises a cold-conductor resistance.

9. The power supply unit according to claim 1 , wherein the protective element is disposed in a housing of the power supply unit and wherein an additional output configured to deliver the output current and the output voltage is connected downstream of the protective element, ( 103 ), wherein the signal output path is disposed between the output and the additional output.

10. The power supply unit according to claim 1 , further comprising a user interface configured to set or pre-store one or more of: the first amplitude threshold value, the second amplitude threshold value, or the third amplitude threshold value, amplitude threshold value.

11. The power supply unit according to claim 10 , wherein the user interface comprises a communications interface or an actuating element configured to set the respective amplitude threshold value.

12. The power supply unit according to claim 1 , wherein the power supply unit is configured to set the amplitude of the output voltage or the amplitude of the output current based on an amplitude value of a supply voltage of the power supply unit in order to reduce an electric power uptake of the power supply unit.

13. A method for supplying a consuming device with electrical energy by means of a power supply unit, comprising:

measuring an amplitude of an output current of a power supply unit; and

reducing an amplitude of an output voltage of the power supply unit and increasing the amplitude of the output current above a second amplitude threshold value when the output current exceeds a first amplitude threshold value, in order to trigger a protective element, connected downstream of an output of the power supply unit, to interrupt a signal output path of the protective element;

wherein the protective element is configured to maintain the Rail signal output path when the output current exceeds the first amplitude threshold value and to interrupt the signal output path when the output current exceeds a second amplitude threshold value, wherein the second amplitude threshold value is higher than the first amplitude threshold value.

14. The method according to claim 13 , further comprising:

increasing the amplitude of the output voltage if the amplitude of the output current is below a third amplitude threshold value following expiration of a predetermined time interval.

15. The method according to claim 13 , further comprising:

reducing again the amplitude of the output voltage, if the amplitude of the output current is above the third amplitude threshold value after expiration of the predetermined time interval.

16. The method of claim 13 , further comprising:

setting or pre-storing one or more of: the first amplitude threshold value, the second amplitude threshold value, or the third amplitude threshold value.

17. The method of claim 13 , further comprising:

setting the amplitude of the output voltage or the amplitude of the output current based on an amplitude value of a supply voltage of the power supply unit in order to reduce an electric power uptake of the power supply unit.

18. The power supply unit of claim 4 , wherein the measuring device comprises a shunt or a Hall probe.

19. The power supply unit of claim 4 , wherein the measuring device is incorporated into a microcontroller of the power supply unit.

20. The power supply unit of claim 5 , wherein the control device comprises a potentiometer.