Biometric Sensor Mode Switching for Low-Power Sensing
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Solution Overview
Problem
Sensor devices that irradiate light onto a sensing target face challenges in power-saving operations, particularly when detecting biometric information such as pulse and breathing rates, as they consume excessive power during continuous sensing.
Innovation Solution
The sensor device incorporates a control unit that switches between low power and normal power modes based on the presence and state of the sensing target, using sparse sensing when no target is detected and normal sensing when a target is present and active, along with a power management system that optimizes battery usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous sensing is performed to detect biometric information, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The sensor device performs sensing operations periodically rather than continuously. The control unit switches between first sensing mode (lower power) and second sensing mode (higher power) based on detected conditions, creating periodic action that balances power consumption with detection accuracy requirements
Solution Approach 2:
The sensor device dynamically adjusts its sensing mode based on real-time detection of sensing targets. When a target is detected, the system transitions to second sensing mode for higher accuracy; when no target is present, it returns to first sensing mode to reduce power consumption, making the system adaptive and dynamic
2Measurement precision
If second sensing mode is activated to detect biometric information accurately, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The control unit continuously monitors detection results and uses this feedback to determine when to switch between sensing modes. When biometric information is successfully detected, the system maintains second sensing mode; when no target is detected, it switches to first sensing mode, creating a feedback-driven power management system
Solution Approach 2:
The system changes operational parameters (sensing intensity, sampling rate) by switching between first and second sensing modes. This parameter change allows the system to optimize the balance between power consumption and detection accuracy based on current operational needs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption by intermittently switching modes, ensuring efficient operation and minimal battery drain, especially when no target is present, while maintaining accurate detection of biometric data.
Implementation Method 1
a sensor configured to detect reflected light from a sensing target or transmitted light of the sensing target
Implementation Method 2
a sensor configured to detect reflected light from a sensing target or transmitted light of the sensing target
Implementation Method 3
The sensor device irradiates light onto a sensing target
Data Source
AI summary
According to one embodiment, a sensor device includes a sensor, a control unit configured to cause the sensor to perform sensing and receive a signal from the sensor, and a processor configured to determine presence or absence of a sensing and obtain biometric information of the sensing target. The control unit is configured to cause the sensor to perform first sensing and cause the sensor to perform second sensing when the processor determines the presence of the sensing target during the first sensing. Power consumption during the first sensing is less than power consumption during the second sensing.