Motion Sensor Power Management in Portable Terminals
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Solution Overview
Problem
Portable terminals with motion recognition capabilities consume excessive power when continuously running motion sensors and recognition programs, leading to shortened battery life due to unnecessary power usage during inactive states like call or music playback.
Innovation Solution
Implementing a method to terminate the motion recognition program and switch the controller mode to a deactivation state when no input is detected, and using a low power mode for the motion sensor to conserve energy, with the controller adjusting clock frequency accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motion sensor and motion recognition program are continuously driven to recognize user motion in real time, then the motion recognition accuracy and response time are improved, but the power consumption increases and battery life is shortened
Solution Approach 1:
The motion recognition program is executed periodically rather than continuously. The controller determines whether to execute the motion recognition program based on specific conditions (such as whether an application is in the foreground or background state), thereby reducing unnecessary executions and power consumption while maintaining effective motion recognition coverage
Solution Approach 2:
The system dynamically adjusts the execution state of the motion recognition program based on runtime conditions. The controller switches between executing and suspending the motion recognition program according to the application state, making the system adaptive to different usage scenarios and optimizing the balance between recognition accuracy and power consumption
2Speed
If the processor operates at high speed to control the motion sensor and motion recognition program, then the motion detection response is improved, but the power consumption increases
Solution Approach 1:
The processor operates at high speed only when the motion recognition program needs to be executed, rather than maintaining high speed continuously. The controller periodically determines whether execution is needed and adjusts processor activity accordingly, reducing overall power consumption while maintaining fast response when needed
3Duration of action of moving object
If the battery capacity is increased to extend usage time, then the portable terminal can operate for longer periods, but the device size increases
Solution Approach 1:
The system converts the potential harm of having to increase battery capacity (which would increase device size) into a benefit by implementing intelligent power management. By reducing power consumption through conditional execution of the motion recognition program, the system achieves extended usage time without increasing battery capacity or device size
Solution Approach 2:
The system changes the operational parameters of the motion recognition program (execution frequency, processor speed) to optimize power consumption. By adjusting these parameters dynamically based on application state, the system extends usage time without requiring larger battery capacity
Data Source
AI summary
A method for reducing power consumption based on a motion sensor and a portable terminal adapted to the method are disclosed. The method includes terminating driving of a motion recognition program according to whether an input is detected by at least one sensor unit disposed in the portable terminal, and switching a mode of a controller included in the portable terminal into a motion recognition deactivation mode. The motion sensor-based portable terminal can reduce the power consumption, thereby lengthening the life span of the battery. The user can use the motion sensor-based portable terminal for a long period of time without frequently recharging its battery.