Method of improving battery recharge efficiency by statistical analysis

1. A method for charging a rechargeable battery installed in a battery powered device using a separate battery charging device, said method comprising the steps of:

providing a charging signal from the battery charging device to the battery powered device, said charging signal including energy to charge said rechargeable battery during a charging session;

executing a first control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, said first control process including the steps of:

monitoring, in the battery charging device, the charging signal provided by the battery charging device to obtain a first parameter measuring an amount of energy being provided by said battery charging device to charge said rechargeable battery, and

adjusting, in the battery charging device, said charging signal based on said first parameter to achieve a desired charging signal; and

parallel to executing said first control process, executing a second control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, said second control process being different from the first control process and including the steps of:

receiving, in the battery charging device from the battery powered device, a second parameter reflecting an amount of energy being received by the battery powered device from the charging signal provided by the battery charging device, and

further adjusting, in the battery charging device, said charging signal based on a statistical analysis of said second parameter that is performed in the battery charging device;

wherein the first control process and the second control process are each performed to charge the rechargeable battery.

2. The method of claim 1 , wherein said first control process is used to adjust the charging signal at a higher frequency than said second control process is used to further adjust the charging signal.

3. The method of claim 1 , wherein said statistical analysis includes using a rolling average and standard deviation of the second parameter.

4. The method of claim 3 , wherein a desired target value of the second parameter is determined based on the standard deviation.

5. The method of claim 1 , further comprising the steps of:

monitoring, in the battery powered device, a temperature in said battery powered device;

transmitting the temperature to said battery charging device; and

still further adjusting said battery charging signal based on said temperature.

6. The method of claim 1 , wherein said battery charging signal is wirelessly transmitted from said battery charging device to said battery powered device.

7. The method of claim 6 , wherein said battery powered device is implanted in a patient and wherein said battery charging device is provided external to said patient.

8. The method of claim 1 , wherein the first parameter comprises a voltage, and the second parameter comprises a current, or vice versa.

9. The method of claim 1 , wherein the first parameter and the second parameter comprise different voltages measured at different locations of a charging path used to charge the rechargeable battery.

10. The method of claim 1 , wherein the first parameter comprises a minimum rectified voltage.

11. A method for charging a rechargeable battery installed in a battery powered device using a separate battery charging device, said method comprising the steps of:

providing a charging signal from the battery charging device to the battery powered device, said charging signal including energy to charge said rechargeable battery during a charging session;

executing a first control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, said first control process including the steps of:

monitoring, in the battery charging device, the charging signal provided by the battery charging device to obtain a first parameter measuring an amount of energy being provided by said battery charging device to charge said rechargeable battery, and

adjusting, in the battery charging device, said charging signal based on said first parameter to achieve a desired charging signal; and

parallel to executing said first control process, executing a second control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, said second control process being different from the first control process and including the steps of:

receiving, in the battery charging device from the battery powered device, a second parameter reflecting an amount of energy being received by the battery powered device from the charging signal provided by the battery charging device, and

further adjusting, in the battery charging device, said charging signal based on a statistical analysis of said second parameter performed in said battery charging device to obtain a desired target value of the second parameter in said battery powered device, wherein said statistical analysis includes using a rolling average and standard deviation of the second parameter;

wherein said first control process is used to adjust the charging signal at a higher frequency than said second control process is used to further adjust the charging signal, and wherein the first control process and the second control process are each performed to charge the rechargeable battery.

12. The method of claim 11 , wherein a desired target value of the second parameter is determined based on the standard deviation.

13. The method of claim 11 , further comprising the steps of:

monitoring, in the battery powered device, a temperature in said battery powered device;

transmitting the temperature to said battery charging device; and

still further adjusting said battery charging signal based on said temperature.

14. The method of claim 11 , wherein said battery charging signal is wirelessly transmitted from said battery charging device to said battery powered device.

15. The method of claim 14 , wherein said battery powered device is implanted in a patient and wherein said battery charging device is provided external to said patient.

16. A method for charging a rechargeable battery installed in a battery powered device using a separate battery charging device, said method comprising the steps of:

wirelessly transmitting a charging signal from the battery charging device to the battery powered device, said charging signal including energy to charge said rechargeable battery during a charging session;

executing a first control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, said first control process including the steps of:

monitoring, in the battery charging device, the charging signal provided by the battery charging device to obtain a first parameter measuring an amount of energy being provided by said battery charging device to charge said rechargeable battery, and

adjusting, in the battery charging device, said charging signal based on said first parameter to achieve a desired charging signal; and

parallel to executing said first control process, executing a second control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, said second control process being different from the first control process and including the steps of:

wirelessly receiving, in the battery charging device from the battery powered device, a plurality of values of a second parameter reflecting an amount of energy being received by the battery powered device from the charging signal transmitted by the battery charging device, and

further adjusting, in the battery charging device, said charging signal based on a statistical analysis of the plurality of values of said second parameter to obtain a desired target value of the second parameter in said battery powered device;

wherein said first control process is used to adjust the charging signal at a higher frequency than said second control process is used to further adjust the charging signal, and wherein the first control process and the second control process are each performed to charge the rechargeable battery.

17. The method of claim 16 , further comprising the steps of:

monitoring, in the battery powered device, a temperature is said battery powered device;

wirelessly transmitting the temperature from said battery powered device to said battery charging device; and

still further adjusting said battery charging signal based on said temperature.

18. A method for charging a rechargeable battery installed in a medical device implanted in a patient using a separate battery charging device provided outside of said patient, said method comprising the steps of:

wirelessly transmitting a charging signal from the battery charging device to the medical device, said charging signal including energy to charge said rechargeable battery during a charging session;

executing a first control process in the battery charging device for adjusting the charging of the battery in the medical device, said first control process including the steps of:

monitoring, in the battery charging device, the charging signal provided by the battery charging device to obtain a first parameter measuring an amount of energy being provided by said battery charging device to charge said rechargeable battery, and

adjusting, in the battery charging device, said charging signal based on said first parameter to achieve a desired charging signal; and

parallel to executing said first control process, executing a second control process in the battery charging device for adjusting the charging of the rechargeable battery in the medical device, said second control process being different from the first control process and including the steps of:

wirelessly receiving, in the battery charging device from the medical device, a plurality of values of a second parameter reflecting an amount of energy being received by the medical device from the charging signal provided by the battery charging device, and

further adjusting, in the battery charging device, said charging signal based on a statistical analysis of the plurality of values of said second parameter performed in said battery charging device to obtain a desired target value of the second parameter in said medical device;

wherein the first control process and the second control process are each performed to charge the rechargeable battery.

19. The method of claim 18 , wherein said first control process is used to adjust the charging signal at a higher frequency that said second control process is used to further adjust the charging signal.

20. A method for charging a rechargeable battery installed in a battery powered device using a separate battery charging device, said method comprising the steps of:

providing a charging signal from the battery charging device to the battery powered device, said charging signal including energy to charge said rechargeable battery during a charging session;

executing a first control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device; and

parallel to executing said first control process, executing a second control process in the battery charging device for adjusting the charging of the rechargeable battery in the battery powered device, wherein the second control process is different from the first control process and includes:

receiving, in the battery charging device from the battery powered device, a second parameter reflecting an amount of energy being received by the battery powered device from the charging signal provided by the battery charging device; and

further adjusting, in the battery charging device, said charging signal based on a statistical analysis of said second parameter that is performed in the battery charging device;

wherein the first control process and the second control process are each performed to charge the rechargeable battery.

21. The method of claim 20 , wherein the first control process includes:

monitoring, in the battery charging device, the charging signal provided by the battery charging device to obtain a first parameter measuring an amount of energy being provided by said battery charging device to charge said battery; and

adjusting, in the battery charging device, said charging signal based on said first parameter to achieve a desired charging signal.

22. The method of claim 21 , wherein the first control process is used to adjust the charging signal at a higher frequency than said second control process is used to further adjust the charging signal.

23. The method of claim 20 , wherein said statistical analysis includes using a rolling average and standard deviation of the second parameter.

24. The method of claim 23 , wherein a desired target value of the second parameter is determined based on the standard deviation.

25. The method of claim 20 , further comprising:

monitoring, in the battery powered device, a temperature in said battery powered device;

transmitting the temperature to said battery charging device; and

still further adjusting said battery charging signal based on said temperature.

26. The method of claim 20 , wherein said battery charging signal is wirelessly transmitted from said battery charging device to said battery powered device.

27. The method of claim 26 , wherein said battery powered device is implanted in a patient and wherein said battery charging device is provided external to said patient.