Reported state-of-charge scaling

• US 10,371,755 B2
• Filed: 06/16/2015
• Issued: 08/06/2019
• Est. Priority Date: 10/21/2014
• Status: Active Grant

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Fairchild Semiconductor Corporation (ON Semiconductor Corporation)
• Inventors: Meacham, James
• Primary Examiner(s): Pham, Ly D
• Application Number:
  US14/741,262
• Publication Number:
  US 20160109529A1
• Time in Patent Office: 1,512 Days
• Field of Search: 702 63
• CPC Class Codes: G01R 31/36 Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/371 with remote indication, e.g. on external chargers
• CPC Class Codes: G01R 35/005 Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references G01R33/0035, G01R35/002 take precedence
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition

Abstract

In a general aspect, a method can include providing an indication that the electronic device has changed from a battery charging state to a battery discharging state and measuring an initial measured state-of-charge (MSOC) value of a battery of the electronic device. In the event the initial MSOC value is above a threshold value, the method can further include determining a compensation value based on the initial MSOC value and the threshold value, determining an initial reported state of charge (RSOC) value by scaling the initial MSOC value using the compensation value and reporting the initial RSOC value using the electronic device.

Claims

1. A method for reporting battery state of charge, the method comprising:

receiving, by a battery fuel gauge, a signal from a charging circuit of an electronic device, the charging circuit being communicatively coupled to the battery fuel gauge;

determining, by the battery fuel gauge, that the electronic device has changed from a battery charging state to a battery discharging state in response to the signal;

measuring, by the battery fuel gauge, an initial measured state-of-charge (MSOC) value of a battery of the electronic device; and

if the initial MSOC value is above a threshold value;

determining, by the battery fuel gauge, a reported state-of-charge compensation value (RSOC_CV) based on a difference between the initial MSOC value and the threshold value;

scaling, by the battery fuel gauge, the initial MSOC value using the RSOC_CV to obtain an initial reported state-of-charge (RSOC) value; and

triggering, by the battery fuel gauge, display of the initial RSOC value on a display screen of the electronic device, wherein, as an MSOC value decreases over time, a corresponding RSOC value is adjusted and displayed over a range of MSOC values such that the displayed RSOC value linearly decreases over time.

2. The method of claim 1, wherein the threshold value is a predetermined full-charge threshold value for the battery of the electronic device.

3. The method of claim 1, wherein the RSOC_CV is a difference between the initial MSOC value and the threshold value.

4. The method of claim 1, wherein the initial RSOC value is a minimum value of:

a percentage value determined by the initial MSOC value divided by a sum of the threshold value and the RSOC_CV; and

one-hundred percent.

5. The method of claim 1, wherein the reporting the initial RSOC value includes displaying a percentage value corresponding with the initial RSOC value on a display of the electronic device.

6. The method of claim 1, further comprising:

detecting a decrease in a state-of-charge (SOC) of the battery from the initial MSOC value; and

in response to the detecting the decrease;

measuring a changed MSOC value of the battery;

determining a modified RSOC value by scaling the changed MSOC value using the RSOC_CV; and

reporting the modified RSOC value using the electronic device.

7. The method of claim 6, further comprising, prior to determining the modified RSOC value, amortizing the RSOC_CV based on a predetermined range of MSOC values to produce an amortized RSOC_CV, the determining of the modified RSOC value being based on the amortized RSOC_CV.

8. The method of claim 7, wherein the decrease in the SOC is a first decrease, the changed MSOC value is a first changed MSOC value, the amortized RSOC_CV is a first amortized RSOC_CV, and the modified RSOC value is a first modified RSOC value, the method further comprising:

detecting a second decrease in a state-of-charge (SOC) of the battery from the first changed MSOC value;

in response to the detecting the second decrease;

measuring a second changed MSOC value of the battery;

further amortizing the first amortized RSOC_CV to determine a second amortized RSOC_CV; and

if the second amortized RSOC_CV is greater than zero;

determining a second modified RSOC value by scaling the second changed MSOC value using the second amortized RSOC_CV; and

reporting the second modified RSOC value using the electronic device.

9. The method of claim 1, wherein the initial MSOC value is a first initial MSOC and the initial RSOC value is a first initial RSOC value, the method further comprising:

determining, by the electronic device, that the electronic device has changed from a battery discharging state to a battery charging state;

measuring, by the electronic device, a second initial measured state-of-charge (MSOC) value of the battery of the electronic device;

determining whether the RSOC_CV is greater than zero; and

if the RSOC_CV is greater than zero;

determining a second initial RSOC value by scaling the second initial MSOC value using the RSOC_CV; and

reporting the second initial RSOC value using the electronic device.

10. The method of claim 9, wherein the second initial RSOC value is a minimum value of:

a percentage value determined by the second initial MSOC value divided by a sum of a full-charge threshold value of the electronic device and the RSOC_CV; and

one-hundred percent.

11. The method of claim 9, wherein the reporting the second initial RSOC value includes displaying a percentage value corresponding with the second initial RSOC value on a display of the electronic device.

12. The method of claim 9, further comprising:

detecting an increase in a state-of-charge (SOC) of the battery from the second initial MSOC value; and

in response to the detecting the increase;

measuring a changed MSOC value of the battery;

determining a modified RSOC value by scaling the changed MSOC value using the RSOC_CV; and

reporting the modified RSOC value using the electronic device.

13. The method of claim 9, further comprising:

detecting an increase in a state-of-charge (SOC) of the battery from the second initial MSOC value; and

in response to the detecting the increase;

measuring a changed MSOC value of the battery;

amortizing the RSOC_CV to determine an amortized RSOC_CV, the amortizing being across a range of MSOC values determined by a difference between a full-charge threshold value and the initial MSOC value;

determining a modified RSOC value by scaling the changed MSOC value using the amortized RSOC_CV; and

reporting the modified RSOC value using the electronic device.

14. The method of claim 13, wherein the increase in the SOC is a first increase in the SOC, the changed MSOC value is a first changed MSOC value, the amortized RSOC_CV is a first amortized RSOC_CV, and the modified RSOC value is a first modified RSOC value, the method further comprising:

detecting a second increase in a state-of-charge (SOC) of the battery from the first changed MSOC value; and

in response to the detecting the second increase;

measuring a second changed MSOC value of the battery;

further amortizing the first amortized RSOC_CV to determine a second amortized RSOC_CV; and

if the second amortized RSOC_CV is greater than zero;

determining a second modified RSOC value by scaling the second changed MSOC value using the second amortized RSOC_CV; and

reporting the second modified RSOC value using the electronic device.

15. An electronic device configured to report battery state of charge, the electronic device comprising:

a battery;

a charging circuit;

a battery fuel gauge operatively coupled with the battery and the charging circuit;

at least one processor; and

at least one non-transitory storage medium having instructions stored thereon, the instructions, when executed by the at least one processor, result in;

in response to the electronic device changing from a battery charging state to a battery discharging state, the battery fuel gauge receiving a signal indicating the change;

in response to the change, measuring, by the battery fuel gauge, an initial measured state-of-charge (MSOC) value of the battery; and

if the initial MSOC value is above a threshold value, the instructions, when executed by the at least one processor, cause the battery fuel gauge to;

determine a reported state-of-charge compensation value (RSOC_CV) based on a difference between the initial MSOC value and the threshold value;

scale the initial MSOC value using the RSOC_CV to obtain an initial reported state-of-charge (RSOC) value; and

report the initial RSOC value, wherein, as an MSOC value decreases over time, a corresponding RSOC value is adjusted over a range of MSOC values such that the adjusted RSOC value linearly decreases over time.

16. The electronic device of claim 15, wherein the instructions, when executed by the at least one processor, further cause the battery fuel gauge to:

detect a decrease in a state-of-charge (SOC) of the battery from the initial MSOC value; and

in response to the detecting the decrease;

measure a changed MSOC value of the battery;

amortize the RSOC_CV to determine an amortized RSOC_CV, the amortizing being across a range of MSOC values;

determine a modified RSOC value by scaling the changed MSOC value using the amortized RSOC_CV; and

report the modified RSOC value using the electronic device.

17. The electronic device of claim 16, wherein the decrease in the SOC is a first decrease, the changed MSOC value is a first changed MSOC value, the amortized RSOC_CV is a first amortized RSOC_CV, and the modified RSOC value is a first modified RSOC value, the instructions, when executed by the at least one processor, further cause the battery fuel gauge to:

detect a second decrease in a state-of-charge (SOC) of the battery from the first changed MSOC value; and

in response to the detecting the second decrease;

measure a second changed MSOC value of the battery;

further amortize the first amortized RSOC_CV to determine a second amortized RSOC_CV; and

if the second amortized RSOC_CV is greater than zero;

determine a second modified RSOC value by scaling the second changed MSOC value using the second amortized RSOC_CV; and

report the second modified RSOC value using the electronic device.

18. The electronic device of claim 15, wherein the initial MSOC value is a first initial MSOC and the initial RSOC value is a first initial RSOC value, the instructions, when executed by the at least one processor, further resulting in:

the battery fuel gauge receiving an indication that the electronic device has changed from a battery discharging state to a battery charging state;

measuring, by the battery fuel gauge, a second initial measured state-of-charge (MSOC) value of the battery of the electronic device;

determining whether the RSOC_CV is greater than zero; and

if the RSOC_CV is greater than zero, the instructions, when executed by the at least one processor, cause the battery fuel gauge to;

determine a second initial RSOC value by scaling the second initial MSOC value using the RSOC_CV; and

report the initial RSOC value using the electronic device.

19. The electronic device of claim 18, wherein the instructions, when executed by the at least one processor, further cause the battery fuel gauge to:

detect an increase in a state-of-charge (SOC) of the battery from the second initial MSOC value; and

in response to the detecting the increase;

measure a changed MSOC value of the battery;

amortize the RSOC_CV to produce an amortized RSOC_CV, the amortizing being across a range of MSOC values determined by a difference between a full-charge threshold value and the initial MSOC value; and

if the amortized RSOC_CV is greater than zero;

determine a modified RSOC value by scaling the changed MSOC value using the amortized RSOC_CV; and

report the modified RSOC value using a display of the electronic device.

20. The electronic device of claim 19, wherein the increase in the SOC is a first increase in the SOC, the changed MSOC value is a first changed MSOC value, the amortized RSOC_CV is a first amortized RSOC_CV and the modified RSOC value is a first modified RSOC value, the instructions, when executed by the at least one processor, further cause the battery fuel gauge to:

detect a second increase in a state-of-charge (SOC) of the battery from the first changed MSOC value; and

in response to the detecting the second increase;

measure a second changed MSOC value of the battery;

further amortize the first amortized RSOC_CV to determine a second amortized RSOC_CV; and

if the second amortized RSOC_CV is greater than zero;

determine a second modified RSOC value by scaling the second changed MSOC value using the second amortized RSOC_CV; and

report the second modified RSOC value using the display of the electronic device.