Power supply for critical railroad equipment

1. A power supply system for an electrical equipment, the power supply system comprising:

a first power supply module for supplying power to the electrical equipment; and

a second power supply module and/or a third power supply module for supplying power to the electrical equipment;

wherein the first power supply module is connectable to a first electrical network, is adapted for converting a first input current with a frequency of 50 Hz or 60 Hz from the first electrical network to an output current suppliable to the electrical equipment and comprises a first electrical battery adapted for being charged by the first power supply module;

wherein the second power supply module is connectable to a second electrical network, is adapted for converting a second input current with a frequency of 16⅔ Hz from the second electrical network to the output current and comprises a second electrical battery adapted for being charged by the second power supply module;

wherein the third power supply module is connectable to a third electrical network, is adapted for converting a third DC input current from the third electrical network to the output current and comprises a third electrical battery adapted for being charged by the third power supply module;

wherein the first, second and/or third power supply module comprises a voltage booster for increasing a DC link voltage supplied to a first, second and/or third inverter.

2. The power supply system of claim 1 , wherein the first, second and/or third electrical battery is adapted for being charged, when the first, second and/or third power supply module receives electrical power from the first, second and/or third network.

3. The power supply system of claim 1 ,

wherein, when the first, second and/or third second power supply modules are not able to convert the first, second and/or third input current, the first, second and/or third electrical battery is electrically connected to a first, second and/or third inverter of the first, second and/or third power supply module for generating the output current.

4. The power supply system of claim 1 , wherein the first, second and/or third electrical battery is connectable to the DC link.

5. The power supply system of claim 1 , wherein the first input current is a three-phase current.

6. The power supply system of claim 1 ,

wherein the electrical equipment comprises loads of a railroad system.

7. The power supply system of claim 1 , wherein the first, second and/or third power supply module comprising at least one of:

an input rectifier, an input filter, a DC/DC battery charger, an output filter, and a local bypass switch for disconnecting the power supply module for bypassing the power supply module.

8. The power supply system of claim 1 , further comprising:

a central bypass switch for bypassing all power supply modules simultaneously.

9. The power supply system of claim 1 , further comprising:

a cabinet frame for supporting the power supply modules.

10. The power supply system of claim 1 , further comprising:

a control device, which is adapted to control the power supply modules.

11. A method for maintaining the power supply of an electrical equipment, the method comprising:

supplying the electrical equipment with an output current from a first power supply module converting a first input current with a frequency of 50 Hz or 60 Hz from a first electrical network;

in the case, the first power supply module is not able to convert the first input current, supplying the electrical equipment with the output current from a second power supply module converting a second input current with a frequency of 16⅔ Hz from a second electrical network and/or a third power supply module converting a third DC input current from a third electrical network;

charging a first electrical battery by the first power supply module;

charging one of a second electrical battery by the second power supply module or a third electrical battery by the third power supply module;

in the case, the power supply modules are not able to convert the first and/or second input current, supplying the electrical equipment with power from at least one of the first, second and third electrical battery;

wherein the first, second and/or third electrical battery is adapted for being charged, when the first, second and/or third power supply module receives electrical power from the first, second and/or third network;

wherein the first, second and/or third power supply module comprises a voltage booster for increasing a DC link voltage supplied to a first, second and/or third inverter;

wherein the first, second and/or third electrical battery is connectable to the DC link.

12. The power supply system of claim 1 ,

wherein the first input current is a three-phase current;

wherein the electrical equipment comprises loads of a railroad system;

wherein the first, second and/or third power supply module comprising at least one of an input rectifier, an input filter, a DC/DC battery charger, an output filter, a local bypass switch for disconnecting the power supply module for bypassing the power supply module;

further comprising a central bypass switch for bypassing all power supply modules simultaneously;

further comprising a cabinet frame for supporting the power supply modules; and

further comprising a control device, which is adapted to control the power supply modules.

13. The power supply system of claim 1 ,

wherein the first input current is a three-phase current;

wherein the electrical equipment comprises loads of a railroad system;

wherein the first, second and/or third power supply module comprising at least one of an input rectifier, an input filter, a DC/DC battery charger, an output filter, a local bypass switch for disconnecting the power supply module for bypassing the power supply module;

further comprising a central bypass switch for bypassing all power supply modules simultaneously; and

further comprising a cabinet frame for supporting the power supply modules.

14. The power supply system of claim 1 ,

wherein the first input current is a three-phase current;

wherein the electrical equipment comprises loads of a railroad system;

wherein the first, second and/or third power supply module comprising at least one of an input rectifier, an input filter, a DC/DC battery charger, an output filter, a local bypass switch for disconnecting the power supply module for bypassing the power supply module; and

further comprising a central bypass switch for bypassing all power supply modules simultaneously.

15. The power supply system of claim 1 ,

wherein the first input current is a three-phase current;

wherein the electrical equipment comprises loads of a railroad system; and

wherein the first, second and/or third power supply module comprising at least one of an input rectifier, an input filter, a DC/DC battery charger, an output filter, a local bypass switch for disconnecting the power supply module for bypassing the power supply module.

16. A power supply system for an electrical equipment, the power supply system comprising:

a first power supply module for supplying power to the electrical equipment;

a second power supply module and/or a third power supply module for supplying power to the electrical equipment;

wherein the first power supply module is connectable to a first electrical network, is adapted for converting a first input current with a frequency of 50 Hz or 60 Hz from the first electrical network to an output current suppliable to the electrical equipment and comprises a first electrical battery adapted for being charged by the first power supply module;

wherein the second power supply module is connectable to a second electrical network, is adapted for converting a second input current with a frequency of 16⅔ Hz from the second electrical network to the output current and comprises a second electrical battery adapted for being charged by the second power supply module;

wherein the third power supply module is connectable to a third electrical network, is adapted for converting a third DC input current from the third electrical network to the output current and comprises a third electrical battery adapted for being charged by the third power supply module; and

a cabinet frame for supporting the power supply modules.

17. The power supply system of claim 16 , wherein the first, second and/or third electrical battery is adapted for being charged, when the first, second and/or third power supply module receives electrical power from the first, second and/or third network.

18. The power supply system of claim 16 ,

wherein, when the first, second and/or third second power supply modules are not able to convert the first, second and/or third input current, the first, second and/or third electrical battery is electrically connected to a first, second and/or third inverter of the first, second and/or third power supply module for generating the output current.

19. The power supply system of claim 16 , wherein the first, second and/or third electrical battery is connectable to the DC link.

20. The power supply system of claim 16 ,

wherein the electrical equipment comprises loads of a railroad system.