Inertia Sensor Power Gating for Low-Power Motion Detection
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Solution Overview
Problem
Inertia sensors consume excessive power due to constant direct current supply, leading to high energy consumption in various applications.
Innovation Solution
A motion detector system that selectively supplies power to an inertia sensor using a power control signal with a determined pulse width, based on sampling and digital conversion periods, and an operation preparing period, to minimize power usage while maintaining accurate inertia signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct current power is continuously supplied to the inertia sensor, then the sensor can operate continuously and detect motion accurately, but power consumption increases significantly
Solution Approach 1:
The patent applies periodic action by controlling the inertia sensor to operate only during specific time intervals rather than continuously. The controller activates the sensor periodically, supplies power only during the operation period, and shuts off power during non-operation periods. This periodic operation mode maintains motion detection capability while significantly reducing overall power consumption of the inertia sensor.
2Use of energy by moving object
If power is shut off to reduce power consumption, then energy is conserved, but the inertia sensor cannot detect motion during non-operation periods
Solution Approach 1:
The patent applies dynamics by making the sensor operation state changeable between active and inactive modes based on system requirements. The controller dynamically adjusts the operation period and non-operation period of the inertia sensor, allowing the system to adapt between power-saving mode and detection-ready mode. This dynamic control ensures motion detection capability is maintained when needed while enabling power conservation when detection is not required.
Data Source
AI summary
A motion detector and method with low power consumption in an inertia sensor. The motion detector is selectively supplied with power for operation of the inertia sensor according to a power control signal. While the inertia sensor is supplied with power, three-dimensional analog signals are sampled, A/D converted, and outputted via a controller. A pulse width of the power control signal is determined by reflecting the sampling and A/D conversion period and reflecting the operation preparing period of the inertia sensor from the A/D converted value.