Power management integrated circuit

• US 7,072,779 B2
• Filed: 10/17/2005
• Issued: 07/04/2006
• Est. Priority Date: 12/23/2002
• Status: Active Grant

• Current Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Original Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Inventors: Hancock, Martin A., Forth, J. Bradford, Lightbody, Simon H., Huber, Benedikt T., Teachman, Michael E.
• Primary Examiner(s): Nghiem, Michael
• Assistant Examiner(s): KHUU, HIEN DIEU THI
• Application Number:
  US11/252,259
• Publication Number:
  US 20060052958A1
• Time in Patent Office: 260 Days
• Field of Search: 702/60
• US Class Current: 702/60
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

A power management integrated circuit for monitoring a parameter of a power system includes sensor interface circuitry, first logic, at least one random access memory, second logic, and a communication interface. The sensor interface circuitry is operative to receive and process signals representative of voltage and current in a power system. The first logic is operative to receive the signals and produce at least one power parameter. The random access memory is operative to store the at least one power parameter. The second logic is operative to process at least one incoming communication packet and generate at least one outgoing communication packet encapsulating the power parameter. The communication interface is operative to process the at least one incoming communication packet and transmit the at least one outgoing communication packet. The power management integrated circuit may also include a geographic positioning system receiver and a real time clock.

Claims

1. A power management integrated circuit for use in an intelligent electronic device for monitoring at least one parameter of an AC power system, the power management integrated circuit comprising:

sensor interface circuitry formed as part of said power management integrated circuit, said sensor interface circuitry operative to receive and process signals representative of voltage and current in an AC power system;

first logic formed as part of said power management integrated circuit and coupled with said sensor interface circuitry, said first logic operative to receive said signals and produce at least one power parameter, said first logic comprising at least one processor core;

at least one random access memory formed as part of said power management integrated circuit and coupled with said first logic, wherein said at least one random access memory is operative to store said at least one power parameter;

second logic formed as part of said power management integrated circuit and coupled with said first logic, said second logic operative to process at least one incoming communication packet and generate at least one outgoing communication packet encapsulating said at least one power parameter; and

a communications interface formed as part of said power management integrated circuit, said communications interface operative to receive said at least one incoming communication packet from outside said power management integrated circuit and transmit said at least one outgoing communication packet out of said power management integrated circuit;

wherein at least one of said at least one incoming communication packet or said at least one outgoing communication packet comprises an indicator of at least one of a source or a destination of said at least one incoming communication packet or said at least one outgoing communication packet, respectively, and

wherein said communications interface comprises at least one of a universal asynchronous receiver/transmitter (UART), an Ethernet transceiver, a wireless interface or a powerline carrier transmitter/receiver, or combinations thereof.

2. The power management integrated circuit of claim 1 further comprising a realtime clock formed as part of said power management integrated circuit and coupled with said first logic, said realtime clock operative to maintain a time reference for said power management integrated circuit.

3. The power management integrated circuit of claim 2 wherein said realtime clock is set to a desired time in response to an incoming communication packet.

4. The power management integrated circuit of claim 2 wherein at least one of said first logic or said second logic, or combinations thereof, is operative to time stamp said at least one power parameter with a value provided by said realtime clock.

5. The power management integrated circuit of claim 2 further comprising global positioning system receiver circuitry formed as part of said power management integrated circuit, said global positioning system receiver circuitry operative to provide at least one of position and time information to at least one of said realtime clock and said first logic.

6. The power management integrated circuit of claim 5 further comprising a global positioning system antenna coupled with said global positioning system receiver circuitry.

7. The power management integrated circuit of claim 1 wherein said at least one random access memory comprises:

a volatile section operative to provide temporary storage during operation of at least one of said first and second logic; and

a non-volatile section operative to contain configuration information for said power management integrated circuit.

8. The power management integrated circuit of claim 7 wherein said at least one power parameter is stored in said non-volatile section.

9. The power management integrated circuit of claim 1 wherein said sensor interface circuitry comprises an analog front end formed as part of said power management integrated circuit, said analog front end operative to receive and at least one of amplify, attenuate or filter analog signals representative of voltage and current in said AC power system to produce modified analog signals.

10. The power management integrated circuit of claim 9 wherein said sensor interface circuitry further comprises an analog to digital converter formed as part of said power management integrated circuit and coupled with said analog front end, wherein said analog to digital converter is operative to produce digital signals representative of said modified analog signals.

11. The power management integrated circuit of claim 9 further comprising circuitry formed as part of said power management integrated circuit that is operative to convert at least one of said analog signals to a digital signal indicative of the fundamental frequency of said at least one of said analog signals.

12. The power management integrated circuit of claim 10 wherein said first logic is operative to compensate for distortion in at least one of said analog front end, said analog to digital converter or an external transformer capable of being coupled with said power management integrated circuit.

13. The power management integrated circuit of claim 10 wherein said analog to digital converter comprises a first analog to digital converter and a second analog to digital converter that are operative to substantially simultaneously sample at least two of said modified analog signals to produce said digital signals representative of said modified analog signals.

14. The power management integrated circuit of claim 1 wherein at least a portion of the power management integrated circuit is programmed into a field programmable gate array that is formed as part of said power management integrated circuit.

15. The power management integrated circuit of claim 1 wherein said sensor interface circuitry comprises a digital interface formed as part of said power management integrated circuit, said digital interface operative to receive digital signals from a digital sensor, wherein said digital signals are representative of at least one of voltage and current in an AC power system.

16. The power management integrated circuit of claim 1 wherein at least one of said at least one incoming communication packet or said at least one outgoing communication packet further comprises at least one of an error detection code or an error correction code, or combinations thereof.

17. The power management integrated circuit of claim 1 wherein said at least one outgoing communication packet comprises an outgoing fieldbus packet and said at least one incoming communication packet comprises an incoming fieldbus packet.

18. The power management integrated circuit of claim 17 wherein said incoming fieldbus packet and said outgoing fieldbus packet comprise at least one of a Modbus®

protocol, a Profibus protocol or a DNP protocol.

19. The power management integrated circuit of claim 1 wherein said at least one outgoing communication packet comprises an outgoing TCP/IP packet and said at least one incoming communication packet comprises an incoming TCP/IP packet.

20. The power management integrated circuit of claim 19 wherein at least one of said incoming TCP/IP packet and said outgoing TCP/IP packet comprises at least one of an SMTP packet, an HTTP packet, a SOAP packet, a POP packet, an SNMP packet or a PPP packet, or combinations thereof.

21. The power management integrated circuit of claim 1 further comprising a phase lock loop clock circuit formed as part of said power management integrated circuit and coupled with said first logic, said phase lock loop circuit operative to provide a variable clock signal to said at least one processor core.

22. The power management integrated circuit of claim 1 wherein said at least one power parameter comprises at least one of rms voltage, rms current, power, energy, harmonic distortion, frequency or power factor, or combinations thereof.

23. The power management integrated circuit of claim 1 wherein said at least one power parameter comprises a sample of at least one of a voltage waveform, a current waveform or a power waveform, or combinations thereof.

24. The power management integrated circuit of claim 1 further comprising a control circuit formed as part of said power management integrated circuit and coupled with said first logic, said control circuit operative to control a power supply that is operable to supply operating power to said power management integrated circuit.

25. The power management integrated circuit of claim 24 wherein said control circuit is operative to control said power supply with a pulse width modulated signal.

26. The power management integrated circuit of claim 1 wherein said first logic is operative to implement at least one setpoint indicative of when said at least one power parameter is outside a determined range.

27. The power management integrated circuit of claim 26 wherein said first logic is further operative to control at least one digital output formed as part of said power management integrated circuit in response to said setpoint indication, said digital output operative to control a device external to said power management integrated circuit.

28. The power management integrated circuit of claim 27 wherein said digital output is useable to control the application of power from a power system.

29. The power management integrated circuit of claim 27 wherein said device external to said power management integrated circuit comprises a circuit breaker.

30. The power management integrated circuit of claim 1 wherein said at least one random access memory comprises magnetic random access memory.

31. The power management integrated circuit of claim 1 further comprising a supervisor circuit formed as part of said power management integrated circuit, said supervisor circuit operative to monitor a voltage level from a supply of power to said power management integrated circuit.

32. The power management integrated circuit of claim 1 wherein said first logic is operative to compensate for distortion in an external transformer capable of being coupled with said power management integrated circuit.

33. The power management integrated circuit of claim 1 further comprising a display driver formed as part of said power management integrated circuit and coupled with said first logic, said display driver operative to drive a display external to said power management integrated circuit.

34. The power management integrated circuit of claim 1 wherein said second logic is operative to secure data sent through said communications interface.

35. The power management integrated circuit of claim 1 further comprising at least one status input coupled with said first logic, wherein said first logic is operative to perform at least one consumption calculation based on said at least one status input.

36. The power management integrated circuit of claim 1 wherein the power management integrated circuit is operatively incorporated into an intelligent electronic device.

37. The power management integrated circuit of claim 1 wherein the power management integrated circuit is operatively incorporated into a protective relay.

38. The power management integrated circuit of claim 1 wherein the power management integrated circuit is operatively incorporated into a power meter.

39. The power management integrated circuit of claim 1 wherein said processor core comprises a digital signal processor.

40. The power management integrated circuit of claim 1 wherein said first logic comprises a digital signal processor and said second logic comprises a central processing unit.

41. The power management integrated circuit of claim 1 further comprising compensation circuitry formed as part of said power management integrated circuit, said compensation circuitry operative to drive an active current transformer.

42. A power management integrated circuit for use in an intelligent electronic device for monitoring at least one parameter of an AC power system, the power management integrated circuit comprising:

sensor interface circuitry formed as part of said power management integrated circuit, said sensor interface circuitry operative to receive and process signals representative of voltage and current in an AC power system;

a processor formed as part of said power management integrated circuit and coupled with said sensor interface circuitry, said processor operative to receive said signals and produce at least one power parameter;

a communications interface formed as part of said power management integrated circuit, said communications interface operative to receive an incoming communication packet from outside said power management integrated circuit and transmit an outgoing communication packet out of said power management integrated circuit;

a geographic positioning system receiver circuit formed as part of said power management integrated circuit and coupled with said processor; and

a realtime clock formed as part of said power management integrated circuit and coupled with said processor, wherein said realtime clock is set to a desired time in response to a time value provided with one of said incoming communication packet, or said geographic position system receiver circuit.

43. The power management integrated circuit of claim 42 wherein at least one of said incoming communication packet and said outgoing communication packet comprises an indicator of at least one of a source or a destination of said incoming communication packet or said outgoing communication packet, respectively.

44. The power management integrated circuit of claim 42 wherein said communications interface comprises a universal asynchronous receiver/transmitter (UART).

45. The power management integrated circuit of claim 42 further comprising a random access memory formed as part of said power management integrated circuit coupled with said processor, wherein said random access memory is operative to store said at least one power parameter.

46. The power management integrated circuit of claim 42 wherein said communications interface comprises a wireless interface.

47. The power management integrated circuit of claim 42 wherein said communications interface comprises an Ethernet transceiver.

48. The power management integrated circuit of claim 42 wherein said communications interface comprises a powerline carrier interface.

49. A power management integrated circuit for use in an intelligent electronic device for monitoring at least one parameter of an AC power system, the power management integrated circuit comprising:

a processor formed as part of said power management integrated circuit, wherein said processor is operative to receive signals indicative of voltage and current in an AC power system, and produce a power parameter therefrom;

a random access memory comprising a volatile portion and a non-volatile portion, said random access memory formed as part of said power management integrated circuit and coupled with said processor, wherein said random access memory is operative to store said power parameter in said non-volatile portion;

a field programmable gate array formed as part of said power management integrated circuit, wherein said field programmable gate array is operative as a protocol engine;

a communications interface formed as part of said power management integrated circuit, said communications interface cooperatively operative with said field programmable gate array to receive and process an incoming communication packet from outside said power management integrated circuit, and process and transmit an outgoing communication packet out of said power management integrated circuit; and

wherein said communications interface comprises at least one of a universal asynchronous receiver/transmitter (UART), an Ethernet transceiver, a wireless interface, or a powerline carrier transmitter/receiver, or combinations thereof.

50. The power management integrated circuit of claim 49 further comprising a geographic positioning system receiver circuit formed as part of said power management integrated circuit and coupled with said processor, wherein said geographic positioning system receiver circuit is operative to provide position and time information to said processor.

51. The power management integrated circuit of claim 50 further comprising a realtime clock formed as part of said power management integrated circuit and coupled with said processor, wherein said realtime clock is set to a desired time in response to one of said incoming communication packet or said time information providable by said geographic positioning system receiver circuit.