Human Body Contact Detection for Electronic Devices
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Solution Overview
Problem
Electronic devices, such as laptops and wearable electronics, often overheat when in contact with human skin, potentially causing discomfort or harm, and there is a need to determine if they are in contact with a human body to adapt their operation and prevent overheating, while also extending battery life by adjusting power consumption.
Innovation Solution
A system comprising a motion sensor, feature detection circuits, and a classifying circuit that generates metrics from sensor data to determine if an electronic device is in contact with a human body, allowing the device to adapt its behavior, such as reducing temperature or entering low-power mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the electronic device operates at high power to extend usage time, then battery life is improved, but the device generates more heat that can harm human skin when in contact
Solution Approach 1:
The system performs preliminary detection of human body contact using motion sensors and feature detection circuits before high-power operation causes harmful heating. By detecting contact metrics in advance, the system can preemptively adjust power levels or activate cooling mechanisms, preventing skin harm before it occurs while still allowing extended usage when safe
Solution Approach 2:
The system continuously monitors motion sensor data, extracts contact metrics, and feeds this information back to control power consumption and thermal management. This closed-loop feedback enables dynamic adjustment of operating parameters based on real-time contact status, balancing battery life extension with skin safety by reducing power only when contact is detected
2Object-affected harmful factors
If the device continuously monitors for human body contact to prevent overheating, then skin safety is improved, but power consumption increases
Solution Approach 1:
The system applies partial monitoring by selectively analyzing specific motion signal characteristics (contact metrics) rather than continuously processing all sensor data. The feature detection circuits focus only on relevant patterns indicating human body contact, enabling adequate safety monitoring with reduced computational overhead and lower power consumption compared to full-spectrum continuous analysis
3Duration of action of moving object
If the device reduces power consumption to extend battery life when not in contact, then battery life is improved, but the device may overheat when contact is made during high-power operation
Solution Approach 1:
The system maintains a baseline level of motion sensor operation and feature detection readiness even during low-power modes. This preliminary monitoring capability ensures that when human body contact occurs, the system can detect it promptly and initiate thermal management actions before dangerous temperature buildup, bridging the gap between power-saving mode and active thermal protection
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
Effectively prevents skin harm by reducing overheating and extends battery life by accurately determining contact with a human body and adjusting device operation accordingly.
Implementation Method 1
a motion sensor configured to generate a motion signal in response to a movement of an electronic device
Implementation Method 2
an accelerometer configured to generate an output signal in response to a vibration or orientation of an electronic device
Data Source
AI summary
A system may include a motion sensor configured to generate a motion signal in response to a movement of an electronic device, and at least one feature detection circuit configured to determine at least one metric based on the motion signal. The system may further include a classifying circuit configured to determine whether the electronic device is in contact with a human body based on the at least one metric.