Battery clamp connection detection method and apparatus

• US 6,667,624 B1
• Filed: 09/06/2002
• Issued: 12/23/2003
• Est. Priority Date: 06/27/2002
• Status: Active Grant

• Current Assignee: SPX Corporation
• Original Assignee: SPX Corporation
• Inventors: Miller, Garret, Raichle, Kurt
• Primary Examiner(s): Deb, Anjan K.
• Application Number:
  US10/235,703
• Publication Number:
  US 20040000915A1
• Time in Patent Office: 473 Days
• Field of Search: 324/538, 324/421, 324/525, 324/691, 324/713, 324/426, 324/522, 340/636, 340/652, 320/136, 702/63, 702/64, 439/754, 439/913
• US Class Current: 324/522
• CPC Class Codes: G01R 31/364 Battery terminal connectors with integrated measuring arrangements
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/3835 involving only voltage measurements

Abstract

A method and apparatus for testing a battery connection is provided. The apparatus includes a clamp attached to a conductor for attaching the conductor to an object, a first sensor configured to detect a voltage associated with the clamp, and a second sensor configured to detect a voltage associated with the conductor at a point located distally from the clamp, the voltage detected by the first sensor and the voltage detected by the second sensor are compared. A method for testing a connection includes sensing a first voltage in a cable carrying current to at least one of two and from a connection, sensing a second voltage associated with the connection, comparing the first and second voltages, determining whether the connection is acceptable or not acceptable based on the compared voltages.

Claims

1. A testing apparatus comprising:

a clamp attached to a conductor for attaching the conductor to an object, the clamp having an isolated portion;

a first sensor connected to the clamp and configured to detect a voltage associated with the isolated portion of the clamp; and

a second sensor configured to detect a voltage associated with the conductor at point located distally from the clamp, wherein the voltage detected by the first sensor and the voltage detected by the second sensor are compared.

2. The testing apparatus of claim 1, further comprising a current sensor configured to sense a current in the conductor.

3. The testing apparatus of claim 2, wherein the voltage detected by the first sensor and the voltage detected by the second sensor are compared by at least one of an operational differential amplifier and a microprocessor.

4. The testing apparatus of claim 3, wherein the at least one of an operational differential amplifier and a microprocessor determines a resistance by dividing the difference of the sensed voltages by the sensed current.

5. The testing apparatus of claim 4, wherein at least one of a resistance associated with the conductor and voltage drop associated with the resistance associated with the conductor is considered and subtracted from at least one of the difference in sensed voltages and the resistance determined by the at least one of an operational differential amplifier and a microprocessor.

6. The testing apparatus of claim 4, wherein the at least one of an operational differential amplifier and a microprocessor determines whether a connection is acceptable by comparing the resistance to a predetermined range.

7. The testing apparatus of claim 6, wherein the testing apparatus signals to an operator that a connection is at least one of acceptable and non-acceptable by at least one of illuminating a light, displaying a message on a screen, and emitting an audible noise.

8. A testing apparatus comprising:

means for clamping a conducting means to an object, the means for clamping having an isolated portion;

a first sensing means connected with the clamping means for detecting a voltage associated with the isolated portion of the clamping means; and

a second sensing means for detecting a voltage associated with the conducting means at point located distally from the clamping means, wherein the voltage detected by the first sensing means and the voltage detected by the second sensing means are compared.

9. The testing apparatus of claim 8, wherein the voltage detected by the first sensing means and the voltage detected by the second sensing means are compared by a means for comparing.

10. The testing apparatus of claim 9, further comprising a means for sensing a current in the conducting means and inputting a signal indicating the sensed current into the means for comparing.

11. The testing apparatus of claim 10, wherein the means for comparing determines whether a connection is acceptable or not acceptable by comparing the resistance to a predetermined range of acceptable and not acceptable resistances.

12. The testing apparatus of claim 11, wherein the testing apparatus signals to an operator of the testing apparatus that a connection is at least one of acceptable and non-acceptable by a means for signaling an operator.

13. The testing apparatus of claim 10, wherein the means for comparing determines a resistance by dividing the difference of the sensed voltages by the sensed current.

14. The testing apparatus of claim 13, wherein at least one of a resistance associated with the conductor means and a voltage drop associated with the conductor means is considered and subtracted from at least one of the difference in sensed voltages and the resistance determined by the means for comparing.

15. A method for testing a connection comprising:

sensing a first voltage in a cable carrying current at least one of to and from a connection by taking the first voltage measurement from an isolated portion of a clamp;

sensing a second voltage associated with the connection;

comparing the first and second voltages;

determining whether the connection is acceptable or not acceptable based on predetermined parameters.

16. The method of claim 15, further comprising calculating a resistance associated with the connection by determining a current associated with the cable and calculating the resistance by dividing a difference associated with the sensed voltages by the current.

17. The method of claim 15, further comprising:

determining a resistance associated with the cable;

determining a current associated with the cable;

determining a voltage drop caused by the resistance associated with the cable;

subtracting the voltage drop from a difference associated with the sensed voltages; and

calculating a resistance associated with the connection by dividing a remaining difference in the sensed voltages by the current.

18. The method of claim 15, further comprising:

determining a resistance associated with the connection by determining a resistance associated with the cable; and

subtracting the resistance associated with the cable from a second resistance determined by determining a current associated with the cable and dividing a difference associated with the sensed voltages by the current.

19. The method of claim 15, further comprising signaling to an operator that the connection is at least one of acceptable and not acceptable.

20. The method of claim 15, wherein the method is applied to at least one of a positive and negative portion of a DC circuit.