Method and apparatus for testing and charging a power source

• US 7,078,879 B2
• Filed: 03/26/2002
• Issued: 07/18/2006
• Est. Priority Date: 03/26/2002
• Status: Expired due to Term

• Current Assignee: SPX Corporation
• Original Assignee: SPX Corporation
• Inventors: Makhija, Surender K.
• Primary Examiner(s): Vu, Bao Q.
• Application Number:
  US10/105,420
• Publication Number:
  US 20030184262A1
• Time in Patent Office: 1,575 Days
• Field of Search: 320/106, 320/110, 320/132, 320/133, 324/326
• US Class Current: 320/133
• CPC Class Codes: G01R 31/378 specially adapted for the type of battery or accumulator
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A battery tester and charger is provided for safely and efficiently testing and charging partially charged and discharged batteries. Information about the battery to be tested is inputed by the user. A first heavy loaded is applied and the bounce back voltage is used to determine the state of charge of the battery. If the battery is chargeable then a set charge time is determined. If not, then the battery can be discarded.

Claims

1. A method of charging batteries, comprising the steps of:

entering information corresponding to a vehicle battery to be charged into a battery charger;

performing a first heavy load test on the vehicle battery to determine whether a bounce back voltage is less than or greater than 12.6 volts;

determining a condition of the vehicle battery to determine whether the vehicle battery can be charged based upon the first heavy load test;

determining an optimum charge rate based upon the condition of the vehicle battery;

determining a set charge time for the vehicle battery based upon the first heavy load test; and

charging the vehicle battery for the set charge time at the optimum charge rate if the bounce back voltage is less than 12.6 volts.

2. The method of claim 1 wherein said information corresponding to said battery includes battery type.

3. The method of claim 1 wherein the first heavy load test comprises:

applying a first load to the vehicle battery and releasing a first load after a first prescribed time;

measuring a first battery voltage after said first prescribed time;

measuring a bounce back voltage at a second prescribed time after said first prescribed time;

applying a second load to the battery and releasing the second load after a third prescribed time; and

measuring a second battery voltage after the third prescribed time.

4. The method of claim 1 wherein when the bounce back voltage is greater than 12.6 volts, the method further comprises:

measuring the battery cold cranking amps (“

CCA”

) value by applying a micro-load test to the battery; and

determining the condition of the battery based upon said battery CCA value.

5. The method of claim 4 wherein a measured CCA value constitutes that the battery is good and charging is complete.

6. The method of claim 5 wherein the battery is good when the measured CCA value is greater than approximately 70% of a rated CCA value.

7. The method of claim 1 further comprising:

performing a second heavy load test on said battery to determine whether the battery accepts charge;

performing a micro load test on said battery to determine the condition of the battery; and

completing charging of said battery.

8. The method of claim 7 wherein said second heavy load test comprises:

applying a first heavy load for a first preset time;

waiting a second preset time;

applying a second heavy load for a third preset time; and

determining the condition of the battery.

9. The method of claim 7 wherein a determination that the battery is in good condition further comprises:

measuring a CCA value of the battery by applying a micro-load to the battery; and

determining whether the condition of the battery based upon said battery CCA value.

10. A battery charger, comprising:

means for entering information corresponding to a vehicle battery to be charged into the battery charger;

means for determining a connection between the battery and the battery charger;

means for performing a first heavy load test on said battery to determine whether a bounce back voltage is less than or greater than 12.6 volts;

means for determining a condition of the battery to determine whether the battery can be charged based upon the first heavy load test;

means for determining an optimum charge rate based upon the condition of the battery;

means for determining a set charge time for the battery based upon the first heavy load test; and

means for charging the battery for the set charge time at the optimum charge rate when the bounce back voltage is less than 12.6 volts.

11. The battery charger of claim 10 wherein said information corresponding to said battery includes battery type.

12. The battery charger of claim 10 wherein the first heavy load test comprises:

applying a first load to the battery and releasing a first load after a first prescribed time;

measuring a first battery voltage after said first prescribed time;

measuring a bounce back voltage at a second prescribed time after said first prescribed time;

applying a second load to the battery and releasing the second load after a third prescribed time; and

measuring a second battery voltage after the third prescribed time.

13. The battery charger of claim 10 further comprises:

means for measuring the battery cold cranking amps (“

CCA”

) value by applying a micro-load test to the battery; and

means for determining the condition of the battery based upon said battery CCA value.

14. The battery charger of claim 13 wherein a measured CCA value constitutes that the battery is good and charging is complete.

15. The battery charger of claim 14 wherein the battery is good when the measured CCA value is greater than approximately 70% of a rated CCA value.

16. The battery charger of claim 10 further comprising:

means for performing a second heavy load test on said battery to determine whether the battery accepts charge;

means for performing a micro load test on said battery to determine the condition of the battery; and

means for completing charging of said battery.

17. The battery charger of claim 16 wherein said second heavy load test comprises:

means for applying a first heavy load for a first preset time;

means for waiting a second preset time;

means for applying a second heavy load for a third preset time; and

means for determining the condition of the battery.

18. The battery charger of claim 16 wherein a determination that the battery is in good condition further comprises:

means for measuring a CCA value of the battery by applying a micro-load to the battery; and

means for determining whether the condition of the battery based upon said battery CCA value.

19. A method of charging batteries, comprising the steps of:

performing a first heavy load test on a vehicle battery to determine whether a bounce back voltage is less than or greater than 12.6 volts;

determining a condition of the battery to determine whether the battery can be charged based upon the first heavy load test;

determining an optimum charge rate based upon the condition of the battery;

determining a set charge time for the battery based upon the first heavy load test; and

charging the battery for the set charge time at the optimum charge rate when the bounce back voltage is less than 12.6 volts.

20. The method of claim 19 further comprising:

entering battery information into a battery charger.

21. The method of claim 20 further comprising:

performing a second heavy load test on said battery to determine whether the battery accepts charge.

22. The method of claim 19 further comprising:

performing a second heavy load test on said battery to determine whether the battery accepts charge.

23. The method of claim 19 further comprising:

performing a second heavy load test on said battery to determine whether the battery accepts charge;

performing a micro load test on said battery to determine the condition of the battery; and

completing charging of said battery.

24. The method of claim 20 further comprising:

performing a second heavy load test on said battery to determine whether the battery accepts charge;

performing a micro load test on said battery to determine the condition of the battery; and

completing charging of said battery.

25. An apparatus for charging batteries, comprising:

an input device for entering information corresponding to a vehicle battery to be charged into the battery charger;

a microprocessor coupled to the input device, wherein the microprocessor performs a first heavy load test on said battery and determines whether a bounce back voltage is less than or greater than 12.6 volts, to determine a condition of the battery to determine whether the battery can be charged based upon the first heavy load test, the microprocessor additionally determines an optimum charge rate based upon the condition of the battery, the microprocessor additionally determines a set charge time for the battery based upon the first heavy load test; and

a charger connected to the processor that charges the battery for the set charge time and charge rate when the bounce back voltage is less than 12.6 volts.

26. The apparatus of claim 25 wherein said information corresponding to said battery includes battery type.

27. The apparatus of claim 25 wherein said microprocessor further performs:

a second heavy load test on said battery to determine whether the battery accepts charge; and

a micro load test on said battery to determine the condition of the battery.