ELECTRICAL VEHICLE CHARGING USING FUEL CELL SYSTEM

• US 20120326668A1
• Filed: 06/26/2012
• Published: 12/27/2012
• Est. Priority Date: 06/27/2011
• Status: Active Grant

• Current Assignee: Bloom Energy Corporation
• Original Assignee: Bloom Energy Corporation
• Inventors: Ballatine, Arne, Pearson, Chad, Gurunathan, Ranganathan, Doronzo, Alberto, Shyamavadhani, Muralidhara Ramakrishna
• Granted Patent: US 9,698,598 B2
• Time in Patent Office: Days
• US Class Current: 320/109
• CPC Class Codes: B60L 53/20 characterised by converters located in the vehicle
• CPC Class Codes: B60L 53/305 Communication interfaces
• CPC Class Codes: B60L 53/54 Fuel cells
• CPC Class Codes: B60L 53/64 Optimising energy costs, e.g. responding to electricity rates
• CPC Class Codes: B60L 53/67 Controlling two or more charging stations
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 2300/10 The dispersed energy generation being of fossil origin, e.g. diesel generators
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 2310/10 The network having a local or delimited stationary reach
• CPC Class Codes: H02J 2310/16 The load or loads being an Information and Communication Technology [ICT] facility
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 4/00 Circuit arrangements for mains or distribution networks not specified as ac or dc
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 10/126 : the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A battery charging station receives power from two or more sources and supplies power to charge batteries of electric vehicles and devices.

Claims

1. An electric vehicle battery charging system comprising:

a plurality of electric vehicle charging stations; and

a plurality of power modules,

wherein each of the plurality of power modules comprises at least one fuel cell segment,

wherein M of the plurality of electric vehicle charging stations receive power from N of the plurality of power modules, and

wherein in at least one configuration M is not equal to N.

2. The system of claim 1 wherein the system comprises the M electric vehicle charging stations and the N power modules.

3. The system of claim 1 further comprising:

a first charging DC/DC converter electrically connected to an output of a first power module of the plurality of power modules; and

a second charging DC/DC converter electrically connected to an output of a second power module of the plurality of power modules,

wherein an output of the first charging DC/DC converter is electrically connected to a common node,

wherein an output of the second DC/DC converter is electrically connected to the common node, and

wherein a first electric vehicle battery charging device of the plurality of electric vehicle charging stations is electrically connected to the common node.

4. The system of claim 3 wherein:

an output of the first charging DC/DC converter is electrically connected to a common node through a first diode; and

an output of the second DC/DC converter is electrically connected to the common node through a second diode to form a diode-or circuit, and

the common node is selectively supplied power from at least the first or the second charging DC/DC converter by the diode-or circuit.

5. The system of claim 4 wherein the diode-or circuit further comprises a power factor corrected rectifier electrically connected to an alternating current (AC) source and to the common node, wherein the common node is selectively supplied power from at least the first or second charging DC/DC converter and the AC source by the diode-or circuit.

6. The system of claim 3 wherein:

an output of the first charging DC/DC converter is electrically connected to a common node through a first protection circuit;

an output of the second DC/DC converter is electrically connected to the common node through a second protection circuit, and

the common node is selectively supplied power from at least the first or the second charging DC/DC converter by the first and second protection circuits.

7. The system of claim 1 further comprising:

a first charging DC/DC converter having an input electrically connected to an output of a first power module; and

a second charging DC/DC converter having an input electrically connected to an output of the first charging DC/DC converter, wherein an output of the second charging DC/DC converter is electrically connected to an electric vehicle charging station of the plurality of electric vehicle charging stations.

8. The system of claim 7 further comprising:

a switching device comprising one or more switches having at least a first configuration, wherein;

the first charging DC/DC converter output is electrically connected to the switching device; and

the second charging DC/DC converter output is electrically connected to the electric vehicle charging station,

wherein in the first configuration of the switching device, the input of the first charging DC/DC converter is electrically connected to an output of a first power module of the N power modules and the input of the second charging DC/DC converter is electrically connected to an output of a second power module of the N power modules and the outputs of the first and second charging DC/DC converters are electrically connected to the electric vehicle charging station.

9. The system of claim 8, wherein the switching device comprises a second configuration wherein in the second configuration of the switching device, the input of the second charging DC/DC converter is electrically connected to the output of the first charging DC/DC converter and the output of the second charging DC/DC converter is electrically connected to the electric vehicle battery charging device.

10. The system of claim 1 further comprising:

a switching device comprising one or more switches having at least a first configuration;

a first charging DC/DC converter having an input electrically connected to an output of a first power module of the N power modules and having a first output electrically connected to the switching device; and

a second charging DC/DC converter having an input electrically connected to an output of a second power module of the N power modules and having a second output electrically connected to the switching device, and

wherein in the first configuration of the switching device, the first output of the first charging DC/DC converter is electrically connected to a first common node, the second output of the second DC/DC converter is electrically connected to the first common node, and the first electric vehicle charging station of the M electric vehicle charging stations is electrically connected to the first common node.

11. The system of claim 10 wherein the switching device comprises a second configuration and wherein in the second configuration of the switching device, the first output of the first charging DC/DC converter is electrically connected to a second common node, the second output of the second DC/DC converter is electrically connected to the second common node, and a second electric vehicle charging station of the M electric vehicle charging stations is electrically connected to the second common node.

12. The system of claim 10 wherein the switching device comprises a third configuration and wherein in the third configuration of the switching device, the first output of the first charging DC/DC converter is electrically connected to the first electric vehicle charging station and the second output of the second DC/DC converter is electrically connected to the second electric vehicle charging station.

13. The system of claim 2 further comprising a DC bus, wherein the N power modules supply power to the DC bus and wherein the DC bus supplies power to the M electric vehicle charging stations.

14. The system of claim 2 further comprising a DC bus, wherein the N power modules are electrically connected in parallel to the DC bus via N DC/DC converters and to the M electric vehicle charging stations.

15. The system of claim 1 further comprising a DC bus and at least one alternative DC source, wherein the DC bus receives power from at least two of the plurality of power modules and the at least one alternative DC source and wherein the plurality of electric vehicle charging stations receive power from the DC bus.

16. The system of claim 15, wherein the plurality electric vehicle charging stations are electrically connected to the DC bus via a disconnect module.

17. The system of claim 16, wherein the electric vehicle charging station further comprises a charging DC/DC converter for supplying power to a battery of an electric vehicle from the DC bus.

18. The system of claim 16, wherein the electric vehicle charging station further comprises at least two charging DC/DC converters electrically connected in series for supplying power to the battery of an electric vehicle from the DC bus.

19. The system of claim 16, wherein the electric vehicle charging station further comprises at least two charging DC/DC converters electrically connected in parallel for supplying power to the battery of an electric vehicle from the DC bus.

20. The system of claim 16 further comprising one or more battery docking stations configured to receive an electric vehicle battery for charging.

21. The system of claim 16 further comprising a DC/AC inverter electrically connected to the DC bus and configured to supply AC to an electric vehicle for charging a battery of an electric vehicle.

22. The system of claim 16, wherein the electric vehicle charging station further comprises a bidirectional DC/DC converter electrically connected to the DC bus and configured to supply DC to an electric vehicle for charging a battery of an electric vehicle or to receive power from the battery of the electric vehicle.

23. A method for providing power to an electric vehicle battery charging system, the method comprising supplying power from the N power modules to the M electric vehicle charging stations, wherein each of the N power modules comprises at least one fuel cell segment, and wherein in at least one configuration M is not equal to N.

24. The method of claim 23 wherein supplying power from the N power modules to the M electric vehicle charging stations comprises:

supplying power to a first charging DC/DC converter from a first power module of the N power modules;

supplying power to a second charging DC/DC converter from a second power module of the N power modules;

supplying power from an output of the first charging DC/DC converter to a common node,

supplying power from an output of the second DC/DC converter to the common node, and

supplying power to a first electric vehicle charging station of the M electric vehicle charging stations from the common node.

25. The method of claim 23 wherein supplying power from N power modules to a M electric vehicle charging stations comprises:

supplying power from a first power module of the N power modules to a first charging DC/DC converter;

supplying power to a common node from an output of the first charging DC/DC converter through a first diode;

supplying power from a second power module of the N power modules to a second charging DC/DC converter;

supplying power to the common node from an output of the second charging DC/DC converter through a second diode, wherein the first and second diodes form a diode-or circuit.

26. The method of claim 25 wherein the diode-or circuit further comprises a power factor corrected rectifier electrically connected to an alternating current (AC) source and to the common node, and wherein the method further comprises supplying power to the common node selectively from at least the first or the second charging DC/DC converter and the AC source by the diode-or circuit.

27. The method of claim 23 wherein supplying power from the N power modules to the M electric vehicle charging stations comprises:

supplying power from a first power module of the N power modules to a first charging DC/DC converter;

supplying power to a common node from an output of the first charging DC/DC converter through a first protection circuit;

supplying power from a second power module of the N power modules to a second charging DC/DC converter;

supplying power to the common node from an output of the second charging DC/DC converter through a second protection circuit.

28. The method of claim 23 wherein supplying power from the N power modules to the M electric vehicle charging stations comprises:

supplying power to a first charging DC/DC converter from a first power module of the N power modules;

supplying power to a second charging DC/DC converter from the first charging DC/DC converter; and

supplying power to a first electric vehicle charging station of the M electric vehicle charging stations from the second charging DC/DC converter.

29. The method of claim 28 wherein supplying power from the first charging DC/DC converter to a second charging DC/DC converter comprises supplying power via a first switching element in a first configuration.

30. The method of claim 29 wherein supplying power from the N power modules to the M electric vehicle charging stations comprises:

supplying power to the first charging DC/DC converter from the first power module of the N power modules;

supplying power from the first charging DC/DC converter to the first electric vehicle charging station via a second switching element;

supplying power to the second charging DC/DC converter from a second power module of the N power modules via the first switching element in a second configuration; and

supplying power from the second charging DC/DC converter to the first electric vehicle charging station.

31. The method of claim 23 wherein supplying power from the N power modules to the M electric vehicle charging stations comprises:

supplying power to a first charging DC/DC converter from a first power module of the N power modules;

supplying power from the first charging DC/DC converter to a first common node via a first switching element in a first configuration;

supplying power to a second charging DC/DC converter from a second power module of the N power modules;

supplying power from the second charging DC/DC converter to the first common node via a second switching element in a first configuration; and

supplying power to a first electric vehicle charging station of the M electric vehicle charging stations via the first common node.

32. The method of claim 31 wherein supplying power from the N power modules to the M electric vehicle charging stations further comprises:

supplying power to the first charging DC/DC converter from the first power module of the N power modules;

supplying power from the first charging DC/DC converter to a second common node via the first switching element in a second configuration;

supplying power to the second charging DC/DC converter from the second power module of the N power modules;

supplying power from the second charging DC/DC converter to the second common node via the second switching element in a second configuration; and

supplying power to a second electric vehicle charging station of the M electric vehicle charging stations via the second common node.

33. The method of claim 32 wherein supplying power from the N power modules to the M electric vehicle charging stations comprises:

supplying power to the first charging DC/DC converter from the first power module of the N power modules;

supplying power from the first charging DC/DC converter to the first electric vehicle charging station of the M electric vehicle charging stations via the first switching element in a third configuration;

supplying power to the second charging DC/DC converter from the second power module of the N power modules; and

supplying power from the second charging DC/DC converter to the second electric vehicle charging station of the M electric vehicle charging stations via the second switching element in a third configuration.

34. The method of claim 23 further comprising:

supplying power from the N power modules to a DC/DC bus; and

supplying power from the DC bus to the M electric vehicle charging stations.

35. The method of claim 23 further comprising;

supplying power from the N power modules to a DC bus, wherein N power modules are electrically connected in parallel to the DC bus via N DC/DC converters; and

supplying power from the N power modules to the M electric vehicle charging stations in parallel to supplying power to the DC bus.

36. The method of claim 23 further comprising;

supplying power from the N power modules to a DC bus;

supplying power from at least one alternative DC source to the DC bus; and

supplying power to the M charging station from the DC bus.

37. The method of claim 36 wherein the M electric vehicle charging stations are electrically connected to the DC bus via a disconnect module.

38. The method of claim 37 wherein the M electric vehicle charging stations further comprise a charging DC/DC converter for supplying power from the DC bus to a battery of an electric vehicle.

39. The method of claim 37 wherein the M electric vehicle charging stations further comprise at least two charging DC/DC converters electrically connected in series for supplying power from the DC bus to a battery of an electric vehicle.

40. The method of claim 37 wherein the M electric vehicle charging station further comprise at least two charging DC/DC converters electrically connected in parallel for supplying power from the DC bus to a battery of an electric vehicle.

41. The method of claim 37, wherein the M electric vehicle charging stations further comprise one or more battery docking stations configured to receive an electric vehicle battery for charging.

42. The method of claim 37 wherein the M electric vehicle charging stations further comprises a DC/AC inverter electrically connected to the DC bus and configured to supply AC to an electric vehicle for charging a battery of an electric vehicle.

43. The method of claim 37 wherein the M electric vehicle charging station further comprises a bidirectional DC/DC converter electrically connected to the DC bus and configured to supply DC to an electric vehicle for charging a battery of an electric vehicle or to receive power from the battery of the electric vehicle.