Apparatus and method for power management to mitigate declining battery capacity

Patent metadata

Field	Value
Publication number	US-9939870-B2
Application number	US-201514753149-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Jun 29, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A method and apparatus reduce power consumption and mitigate declining battery life. In some embodiments, an initial full charge capacity, C(O), of a rechargeable battery is determined. A full charge capacity, C(t), of the rechargeable battery is determined at time t. An average power consumption profile is determined. A reduced power consumption is implemented based on the average power consumption profile and a factor C(t)/C(O). In other embodiments, functions that are not used in an average power consumption profile are deactivated. Other functions that occur in certain use cases of the average power consumption profile are activated and deactivated as needed.

First claim

What is claimed is:

1. A method used for electronic device operation, the method comprising:
determining an initial full charge capacity, C(0), of a rechargeable battery upon which the electronic device relies for operation;
determining, at time t, via a power control and monitoring function, a full charge capacity, C(t), of the rechargeable battery;
determining an average power consumption profile of the electronic device;
determining a ratio of the full charge capacity C(t) of the rechargeable battery to the initial full charge capacity C(0) of the rechargeable battery;
determining, via a processor of the electronic device, based on the ratio, a reduced power consumption for select use cases within a set of use cases performed within the electronic device, each use case being a predictable set of operations; and
implementing, via the processor and power control and monitoring function, a reduced power consumption of the electronic device based on the average power consumption profile and the ratio utilized as a factor C(t)/C(0) applied to power usage parameters for the select use cases.

2. The method for electronic device operation according to claim 1 , wherein the determination of the average power consumption profile further comprises:
performing the determination externally to the electronic device based on a plurality of users using a same type of electronic device; and
downloading the average power consumption profile to the electronic device.

3. The method for electronic device operation according to claim 1 , wherein the determination of the average power consumption profile comprises basing the determination on at least one or more previous average power consumption profiles for one user of the electronic device.

4. The method for electronic device operation according to claim 1 , wherein the step of determining the average power consumption profile comprises:
determining parameters αi and Pi for each of the set of use cases, UCi, wherein αi represents a fraction of time for which UCi is determined to be active in a use case, the use case including an operation performed by a primary application, supporting utilities or services for the primary application, and hardware controlled by the primary application, and wherein Pi represents power consumed by UCi while the use case is active; and
determining an average power, AP, wherein AP=ΣI (αi·Pi).

5. The method for electronic device operation according to claim 4 , wherein the step of implementing a reduced average power consumption comprises:
adjusting at least one of αi and Pi to generate a modified set of use cases having modified parameters Rαi and RPi that result in a reduced average power profile having a reduced average power, RAP, defined as RAP=ΣI (Rαi×RPi), wherein RAP=AP×C(t)/c(0); and
using the modified parameters Rαi and RPi to control the power consumption of the electronic device during use cases that occur after the reduced user average power consumption profile is generated.

6. The method of claim 5 , wherein the step of adjusting the at least one of αi and Pi to generate a set of use cases having modified parameters further comprises:
reducing a modified parameter RPi of at least one use case UCi, wherein the reduction of RPi is limited such that operation of the use case UCi is not noticeably changed.

7. The method for electronic device operation according to claim 1 , further comprising:
deferring the step of implementing the reduced power consumption until at least one of the following occurs:
an instantaneous battery capacity measured during a discharge of the rechargeable battery from the full charge capacity, C(t), becomes less than a battery capacity threshold; and
a power consumption during a discharge of the rechargeable battery from the full capacity, C(t), becomes greater than a power consumption threshold.

8. The method of claim 1 , further comprising redefining C(0) in response to an occurrence of at least one of the following conditions:
a new user becomes the primary operator of the user device;
and
the rechargeable battery is augmented.

9. The method for electronic device operation according to claim 1 , wherein C(t) is the full charge capacity of the rechargeable battery when a first user is using the electronic device, the method further comprising:
detecting when an additional user starts using the electronic device; and
determining the reduced average power (RAP) of a use case for the additional user using a ratio C(t)/C(t AU ), wherein C(t AU ) is the full charge capacity of the rechargeable battery when the additional user begins using the electronic device.

10. The method for electronic device operation according to claim 1 , wherein the determined average power consumption profile of the electronic device comprises a plurality of use cases, and the method further comprises:
implementing a reduced power consumption of the electronic device by performing at least one of:
deactivating at least one function that is not used in any of the plurality of use cases; and
deactivating at least one function during at least one of the plurality of use cases in which the function is not needed, and activating the at least one function during at least another one of the plurality of use cases in which the function is needed;

wherein a function is one of: an application and hardware that supports the application; a supporting utility and hardware that supports the supporting utility; or a standby utility and hardware that supports the standby utility; and
wherein a consumption of power by the electronic device is reduced without user intervention.

11. An electronic device, comprising:
a processor function;
a memory;
a rechargeable battery; and
a power control and monitor function, wherein executable software instructions in the memory are executed by the processor function to interact with the power control and monitor function to perform the following actions:
determine an initial full charge capacity, C(0), of the rechargeable battery upon which the electronic device relies for operation;
determine, at time t, a full charge capacity, C(t), of the rechargeable battery;
determine an average power consumption profile of the electronic device;
determine a ratio of the full charge capacity C(t) of the rechargeable battery to the initial full charge capacity C(0) of the rechargeable battery;
determining, based on the ratio, a reduced power consumption for select use cases within a set of use cases performed within the electronic device, each select use case being a predictable set of operations; and
implement a reduced power consumption of the electronic device based on the average power consumption profile and the ratio utilized as a factor C(t)/C(0) applied to power usage parameters for the select use cases.

12. The electronic device according to claim 11 , wherein the determination of the average power consumption profile further comprises:
performing the determination externally to the electronic device based on a plurality of users using a same type of electronic device; and
the processor function downloading the average power consumption profile to the electronic device.

13. The electronic device according to claim 11 , wherein performing the determination of the average power consumption profile comprises the processor function basing the determination on at least one or more previous average power consumption profiles.

14. The electronic device according to claim 11 , wherein determining the average power consumption profile comprises the processor function:
determining parameters αi and Pi

Assignees

• Motorola Mobility Llc

Inventors

• Krishnappa Abhijith
• Ballantyne Wayne
• Kumar Karthik
• Winkler David A

Classifications

• Y02B60/1292

  Cross-Sectional Technologies · mapped topic

• G06F1/3203 Primary

  Power management, i.e. event-based initiation of a power-saving mode · CPC title

• Y02B60/1242

  Cross-Sectional Technologies · mapped topic

• G06F1/3212

  Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level · CPC title

• G06F1/3287

  by switching off individual functional units in the computer system · CPC title