Battery monitoring system

• US 20020021131A1
• Filed: 01/19/2001
• Published: 02/21/2002
• Est. Priority Date: 05/09/2000
• Status: Active Grant

• Current Assignee: Emerson Network Power Energy Systems North America Incorporated (Emerson Electric Company)
• Original Assignee: Dale B. Garret, David F. Essi III, William C. Colley III, William R. Plow
• Inventors: Plow, William R., Essi, David F. III, Garret, Dale B., Colley, William C. III
• Granted Patent: US 6,498,491 B2
• Time in Patent Office: Days
• US Class Current: 324/426
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]

Abstract

A power distribution system is provided comprising a power regulator, a battery circuit, and a battery monitoring system. The power converter is provided for converting AC power to DC power and for providing DC power to a load. The battery circuit is coupled to the power regulator and the load and is operable to recharge by receiving DC power from the power regulator. The battery circuit is also operable to supply DC power to the load when there is an interruption of power from the load. The battery monitoring system comprises a field measurement device located in close proximity to the battery circuit, the field measurement device including an input mechanism for receiving current measurement data and an analog-to-digital converter for digitizing the received current measurement data. The battery monitoring system further comprises a monitor located remotely from the field measurement device, the monitor including a first communicator for receiving digitized data from the field measurement device.

Claims

1. A battery monitoring system for measuring battery float current comprising:

a field measurement device located in close proximity to a battery, the device including an input mechanism for receiving current measurement data and an analog-to-digital converter for digitizing the received current measurement data; and

a monitor located remotely from the field measurement device, the monitor including a first communicator for receiving digitized data from the field measurement device.

2. The system according to claim 1 wherein the field measurement device further comprises a second communicator for transmitting the digitized data from the field measurement device to the monitor.

3. The system according to claim 2 wherein the second communicator is operable to receive digitized data from a second field measurement device and is operable to transmit the digitized data from the second field measurement device to the monitor.

4. The system according to claim 1 wherein the field measurement device further comprises a power supply for receiving an input voltage from the battery and for providing an output voltage for at least one component within the field measurement device.

5. The system according to claim 1 wherein the field measurement device further comprises a controller for providing control signals to the analog-to-digital converter.

6. The system according to claim 5 wherein the field measurement device further comprises a second communicator for transmitting the digitized data from the field measurement device to the monitor and wherein the controller is further operable to provide control signals to the second communicator.

7. The system according to claim 2 wherein the field measurement device further comprises a controller for providing control signals to the second communicator.

8. The system according to claim 1 wherein the field measurement device further comprises a power supply for receiving an input voltage from the battery and for providing an output voltage to one or more components within the field measurement device, the components being selected from a set that includes a controller, a second communicator, and an analog-to-digital converter.

9. The system according to claim 6 wherein the field measurement device further comprises a power supply for receiving an input voltage from the battery and for providing at least one output voltage to each of the controller, the second communicator, and the analog-to-digital converter.

10. The system according to claim 9 wherein the input mechanism comprises a pair of wires coupled to the analog-to-digital converter.

11. The system according to claim 1 wherein the monitor comprises a shunt interface circuit that includes the first communicator.

12. The system according to claim 11 wherein the shunt interface circuit further comprises a shunt interface controller.

13. The system according to claim 12 wherein the shunt interface controller filters readings from the field measurement device.

14. The system according to claim 1 wherein the monitor further comprises a monitor CPU.

15. The system according to claim 14 wherein the monitor is operable to execute an algorithm to determine if the field measurement device is measuring the float current of the battery.

16. The system according to claim 15 wherein the algorithm requires the monitor CPU to compute a measurement value that represents the total power discharged from the battery.

17. The system according to claim 16 wherein the algorithm requires the monitor CPU to multiply the measurement value by a charge factor.

18. The system according to claim 17 wherein the charge factor is greater than or equal to the value one.

20. The system according to claim 19 wherein the battery circuit comprises a shunt coupled in series with a battery.

21. The system according to claim 20 wherein the shunt is coupled between a positive terminal of the power regulator and a positive terminal of the battery.

22. The system according to claim 20 wherein the shunt is coupled between a ground terminal of the battery and a system grounding point.

23. The system according to claim 20 wherein the input mechanism comprises wires coupled between the shunt and the analog-to-digital converter for measuring the voltage across the shunt.

24. The system according to claim 19 wherein the field measurement device further comprises a second communicator for transmitting the digitized data from the field measurement device to the monitor.

25. The system according to claim 24 wherein the second communicator is operable to receive digitized data from a second field measurement device that is coupled to a second battery circuit and is operable to transmit the digitized data from the second field measurement device to the monitor.

26. The system according to claim 19 wherein the field measurement device further comprises a power supply for receiving an input voltage from the battery and for providing an output voltage for at least one component within the field measurement device.

27. The system according to claim 19 wherein the field measurement device further comprises a controller for providing control signals to the analog-to-digital converter.

28. The system according to claim 27 wherein the field measurement device further comprises a second communicator for transmitting the digitized data from the field measurement device to the monitor and wherein the controller is further operable to provide control signals to the second communicator.

29. The system according to claim 24 wherein the field measurement device further comprises a controller for providing control signals to the second communicator.

30. The system according to claim 19 wherein the field measurement device further comprises a power supply for receiving an input voltage from the battery and for providing an output voltage to one or more components within the field measurement device, the components being selected from a set that includes a controller, a second communicator, and an analog-to-digital converter.

31. The system according to claim 28 wherein the field measurement device further comprises a power supply for receiving an input voltage from the battery and for providing at least one output voltage to each of the controller, the second communicator, and the analog-to-digital converter.

32. The system according to claim 19 wherein the monitor comprises a shunt interface circuit that includes the first communicator.

33. The system according to claim 32 wherein the shunt interface circuit further comprises a shunt interface controller.

34. The system according to claim 33 wherein the shunt interface controller filters readings from the field measurement device.

35. The system according to claim 19 wherein the monitor further comprises a monitor CPU.

36. The system according to claim 35 wherein the monitor is operable to execute an algorithm to determine if the field measurement device is measuring the float current of the battery.

37. The system according to claim 36 wherein the algorithm requires the monitor CPU to compute a measurement value that represents the total power discharged from the battery.

38. The system according to claim 37 wherein the algorithm requires the monitor CPU to multiply the measurement value by a charge factor.

39. The system according to claim 38 wherein the charge factor is greater than or equal to the value one.

19. A power distribution system comprising:

a power regulator for converting AC power to DC power and for providing DC power to a load;

a battery circuit coupled to the power regulator and the load, the battery circuit being operable to recharge by receiving DC power from the power regulator, the battery circuit also being operable to supply DC power to the load when there is an interruption of power from the load; and

a battery monitoring system comprising;

a field measurement device located in close proximity to the battery circuit, the field measurement device including an input mechanism for receiving current measurement data and an analog-to-digital converter for digitizing the received current measurement data; and

a monitor located remotely from the field measurement device, the monitor including a first communicator for receiving digitized data from the field measurement device.

40. A battery monitor for use in a power distribution system, the battery monitor comprising:

a monitor CPU for monitoring the state of health of a battery in the power distribution system; and

a shunt interface circuit having a first communicator and a shunt interface controller, the first communicator being operable to communicate with a field measurement device located in close proximity to the battery, the field measurement device being operable to communicate state-of-health information regarding the battery, and the shunt interface controller being operable to communicate the state-of-health information to the monitor CPU.

41. The monitor according to claim 40 wherein the shunt interface controller filters the information from the field measurement device.

42. The monitor according to claim 40 wherein the monitor is operable to execute an algorithm to determine if the field measurement device is measuring the float current of the battery.

43. The monitor according to claim 42 wherein the algorithm requires the monitor CPU to compute a measurement value that represents the total power discharged from the battery.

44. The monitor according to claim 43 wherein the algorithm requires the monitor CPU to multiply the measurement value by a charge factor.

45. The monitor according to claim 44 wherein the charge factor is greater than or equal to the value one.

46. The monitor according to claim 40 wherein the first communicator is coupled to a plurality of field measurement devices coupled in series via a communication path.

47. The monitor according to claim 40 wherein the first communicator is coupled to a plurality of communication paths, each communication path including a plurality of field measurement devices coupled in series via the communication path.

49. The device according to claim 48 further comprising a controller for controlling the operation of the analog-to-digital converter and for controlling the operation of the communicator.

50. The device according to claim 49 further comprising a power supply coupled to receive input power from the battery, the power supply being operable to supply power to the analog-to-digital converter, the controller, and to the communicator.

51. The device according to claim 48 further comprising a power supply coupled to receive input power from the battery, the power supply being operable to supply power to the analog-to-digital converter and to the communicator.

52. The device according to claim 48 further comprising input means for measuring the current flowing through the battery.

53. The device according to claim 52 wherein the input means is coupled across a shunt that is in series with the battery.

54. The device according to claim 48 wherein the communicator is coupled to a second communicator in a second field measurement device.

55. The device according to claim 48 wherein the communicator communicates with the battery monitor via digital communications means.

57. The method of claim 57 wherein the communicating step comprises communicating the state-of-health information measured by a first field measurement device to a second field measurement device and then to the monitoring system.

59. The system according to claim 58 wherein the monitor further includes means for determining whether the state-of-health information received is a battery float current measurement.

60. The system according to claim 58 wherein the battery state-of-health measurement means comprises an analog-to-digital converter.

61. The system according to claim 58 wherein the battery state-of-health measurement means measures current flowing through the battery.

48. A field measurement device for use in a power distribution system, the field measurement device comprising:

an input mechanism for measuring battery state-of-health information regarding a battery;

an analog-to-digital converter for digitizing the measured battery state-of-health information; and

a communicator for communicating the digitized battery state-of-health information to a remotely located battery monitor.

56. A method for remotely monitoring the state-of-health of a plurality of batteries in a power distribution system comprising the steps of:

providing a plurality of plurality of field measurement devices, each device being in close proximity to one of the batteries;

performing a battery state-of-health measurement on at least one of the batteries;

communicating the battery state-of-health information to a monitoring system; and

displaying information regarding the state-of-health of the battery at the monitoring system.

58. A battery monitoring system for measuring battery float current comprising:

a field measurement device located in close proximity to a battery, the device including battery state-of-health measurement means for acquiring state-of-health information regarding the battery, the device further including communication means for communicating state-of-health information regarding the battery; and

a monitor located remotely from the field measurement device, the monitor including communicator means for receiving state-of-health information regarding the battery from the field measurement device, the monitor further including means for displaying state-of-health information regarding the battery.