Battery management system for gauging with low power
Implementations of fuel gauges may include a voltage sensor coupled with a memory, a processor coupled with the memory, a mode control logic circuit coupled with the voltage sensor, and a sampling timer coupled with the voltage sensor. The memory may include a plurality of relative state of charge (RSOC) values of a battery. The plurality of RSOC values may be used to calculate a plurality of internal resistance values. The fuel gauge may be configured to either increase, decrease, or maintain a sampling frequency based upon a measured power being drawn by a load coupled to the battery.
1. A fuel gauge comprising:
a voltage sensor coupled with a memory;
a processor coupled with the memory;
a mode control logic circuit coupled with the processor and the voltage sensor; and
a sampling timer coupled with the mode control logic circuit and the voltage sensor;
wherein the memory comprises a plurality of relative state of charge (RSOC) values of a battery;
wherein the plurality of RSOC values are used to calculate a plurality of internal resistance values; and
wherein the fuel gauge is configured to one of increase, decrease, or maintain a sampling frequency based upon a measured power being drawn by a load coupled to the battery.
2. The fuel gauge of claim 1 , wherein the fuel gauge is configured to one of increase or decrease the sampling frequency from one of a zero sampling frequency, a low sampling frequency, a medium sampling frequency, or a high sampling frequency.
3. The fuel gauge of claim 1 , wherein the plurality of RSOC values are derived using a Coulomb counting method.
4. The fuel gauge of claim 1 , wherein the plurality of RSOC values are derived using a voltage tracking method.
5. The fuel gauge of claim 1 , wherein the plurality of internal resistance values are calculated using a temperature of the battery.
6. The fuel gauge of claim 1 , wherein the voltage sensor is configured to repeatedly sample the measured power being drawn by the load from the battery at a sampling frequency corresponding to a power mode of the fuel gauge using the sampling timer.
7. The fuel gauge of claim 1 , wherein the fuel gauge is configured to compare a fluctuation between a plurality of measured power values to one or more threshold values derived from the plurality of RSOC values.
8. The fuel gauge of claim 1 , further comprising a fluctuation monitor block coupled to the voltage sensor.
9. A fuel gauge comprising:
a voltage sensor coupled with a memory;
a processor coupled with the memory;
a mode control logic circuit coupled with the processor and the voltage sensor;
a temperature sensor coupled with the memory; and
a sampling timer coupled with the mode control logic circuit and the voltage sensor;
wherein the memory comprises a plurality of relative state of charge (RSOC) values and a plurality of temperature parameters;
wherein the plurality of RSOC values and the plurality of temperature parameters are used to calculate a plurality of internal resistance values; and
wherein the fuel gauge is configured to one of increase or decrease a sampling frequency based upon a measured power being drawn by a load from a battery.
10. The fuel gauge of claim 9 , wherein the fuel gauge is configured to one of increase or decrease the sampling frequency from one of a zero sampling frequency, a low sampling frequency, a medium sampling frequency, or a high sampling frequency.
11. The fuel gauge of claim 9 , wherein the plurality of RSOC values are derived using a Coulomb counting method.
12. The fuel gauge of claim 9 , wherein the plurality of RSOC values are derived using a voltage tracking method.
13. The fuel gauge of claim 9 , wherein the voltage sensor is configured to repeatedly sample the measured power being drawn by the load from the battery at a sampling frequency corresponding to a power mode of the fuel gauge using the sampling timer.
14. The fuel gauge of claim 9 , wherein the fuel gauge is configured to compare a fluctuation between two measured power values to one or more threshold values derived from the plurality of RSOC values.
15. A method of conserving power comprising:
sampling at least two measured power values of a battery using a voltage sensor coupled with a sampling timer;
determining a fluctuation between the at least two measured power values;
comparing the fluctuation between the at least two measured power values to one or more threshold power measurements, wherein the one or more threshold power measurements are derived from a table of values corresponding with a plurality of relative state of charge (RSOC) values of the battery; and
using the fluctuation between the at least two measured power values, sending a signal to a mode control logic circuit to one of increase, decrease, or maintain a sampling rate of a fuel gauge.
16. The method of claim 15 , further comprising sensing a temperature of the battery through a temperature sensor comprised in the fuel gauge.
17. The method of claim 16 , wherein the temperature of the battery is used to calculate the one or more threshold power measurements.
18. The method of claim 15 , wherein the RSOC values are generated through a Coulomb counting method.
19. The method of claim 15 , wherein the RSOC values are generated through a voltage tracking method.
20. The method of claim 15 , wherein a sampling frequency comprises one of a zero sampling frequency mode, a low sampling frequency mode, a medium sampling frequency mode, or a high sampling frequency mode.