In-line field sensor

• US 20050246114A1
• Filed: 04/29/2004
• Published: 11/03/2005
• Est. Priority Date: 04/29/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Naffziger, Samuel, Rannow, Randy K., Winick, Bradley D., Bois, Karl
• Application Number:
  US10/835,506
• Publication Number:
  US 20050246114A1
• Time in Patent Office: Days
• US Class Current: 702/65
• CPC Class Codes: G01R 15/20 using galvano-magnetic devices, e.g. Hall-effect devices , i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices

Abstract

Methodology, systems, and media associated with sensing a magnetic field produced by an electrical signal flowing through a conductor are described. One exemplary system may include a connector that conveys the electrical signal between conductors and an in-line field sensor positioned and configured to sense the magnetic field produced by the electrical signal without affecting the electrical signal.

Claims

1. A system, comprising:

a connector configured to convey an electrical signal between a first conductor and a second conductor; and

an in-line field sensor positioned to be within a magnetic field created by the electrical signal conveyed through the connector, the in-line field sensor being configured to detect the magnetic field without affecting the electrical signal.

2. The system of claim 1, where the in-line field sensor comprises a two terminal device.

3. The system of claim 2, where the electrical signal voltage is in a range of about −

50 mV to about 50 mV.

4. The system of claim 2, where the electrical signal voltage is in a range of about −

15 V to about 15 V.

5. The system of claim 2, where the electrical signal current is in a range of about −

50 mA to about 50 mA.

6. The system of claim 2, where the electrical signal current is in the range of about −

1 A to about 1 A.

7. The system of claim 2, the in-line field sensor comprising an anisotropic magnetoresistive device.

8. The system of claim 2, the in-line field sensor comprising a giant magnetoresistive device.

9. The system of claim 2, the in-line field sensor comprising a tunneling magnetoresistive device.

10. The system of claim 1, the in-line field sensor being embedded in the connector.

11. The system of claim 1, the in-line field sensor being attached to the connector.

12. The system of claim 1, the in-line field sensor being positioned within the magnetic field but not in physical contact with the connector.

13. The system of claim 1, where the in-line field sensor monitors the magnetic field using one or more of, frequency synthesis and coding synthesis.

14. The system of claim 1, where the electrical signal is provided to one or more of, a microprocessor, a dual in-line memory module, an application specific integrated circuit, an integrated circuit, and a bus.

15. The system of claim 1, the in-line field sensor being positioned to have an easy axis of the in-line field sensor orthogonal to the magnetic field.

16. The system of claim 1, where the in-line field sensor includes a permalloy sensor layer.

17. The system of claim 1, including a feedback logic operably connected to the in-line field sensor, the feedback logic being configured to receive a signal from the in-line field sensor, the signal being related to an attribute of the electrical signal flowing through the connector.

18. The system of claim 17, the attribute being one of, an electrical signal current, an electrical signal voltage, and an electrical circuit power.

19. The system of claim 17, the feedback logic being further configured to control one or more devices involved in providing the electrical signal to the first conductor.

20. The system of claim 2, the system being located in a computer.

21. The system of claim 2, the system being located in an image-forming device.

22. The system of claim 2, the system being located in a cellular telephone.

23. The system of claim 1, the in-line field sensor being configured to generate a signal that indicates one or more of, a current associated with the electrical signal, a voltage associated with the electrical signal, and a power associated with the electrical signal.

24. A method, comprising:

receiving a first signal from a magneto-resistive sensing device positioned at least partially within a magnetic field produced by an electrical signal flowing through a connector, the first signal being related to a variable resistance in the magneto-resistive sensing device, the variable resistance being determined, at least in part, by the magnetic field, the first signal being received without altering the electrical signal;

characterizing one or more attributes of the electrical signal based, at least in part, on the first signal; and

selectively producing a second signal based, at least in part, on one or more of the attributes.

25. The method of claim 24, further including indicating an instant resistance in the magneto-resistive device based on the first signal.

26. The method of claim 24, further including indicating a resistance change in the magneto-resistive device based on the first signal.

27. The method of claim 24, where characterizing the one or more attributes of the electrical signal includes one or more of, producing a current measurement, producing a current change measurement, producing a power measurement, producing a power change measurement, producing a voltage measurement, and producing a voltage change measurement.

28. The method of claim 27, further including selectively controlling an electronic device via the second signal, the second signal being based, at least in part, on one or more of, the current measurement, the current change measurement, the power measurement, the power change measurement, the voltage measurement, and the voltage change measurement.

29. A computer-readable medium storing processor executable instructions operable to perform a method, the method comprising:

receiving a first signal from a magneto-resistive sensing device positioned at least partially within a magnetic field produced by an electrical signal flowing through a connector, the first signal being related to a variable resistance in the magneto-resistive sensing device, the resistance being determined, at least in part, by the magnetic field, the first signal being received without altering the electrical signal;

characterizing one or more attributes of the electrical signal based, at least in part, on the first signal; and

selectively producing a second signal based, at least in part, on one or more of the attributes.

30. A method, comprising:

selecting a magneto-resistive sensing device with a variable resistance that can be detectably altered by an impinging magnetic field; and

positioning the magneto-resistive sensing device relative to a conductor so that the magneto-resistive sensing device will be impinged by a magnetic field produced by an electrical signal flowing through the conductor.

31. The method of claim 30, where the conductor is associated with an electrical connector.

32. The method of claim 31, further including configuring the magneto-resistive sensing device to generate a signal that communicates information concerning the variable resistance.

33. The method of claim 32, further including operably connecting a feedback logic to the magneto-resistive sensing device.

34. The method of claim 33, further including configuring the feedback logic to condition the electrical signal based, at least in part, on the signal.

35. A system, comprising:

means for obtaining one or more attributes of an electrical signal flowing through a conductor in a connector without affecting the electrical signal; and

means for selectively controlling the electrical signal based, at least in part, on the one or more attributes.