Mobile Device Human Body Recognition Sensor
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Solution Overview
Problem
Conventional mobile communication devices reduce output power when any object approaches, including both human bodies and non-human objects, leading to altered communication quality and increased power consumption, as they lack the ability to differentiate between the two effectively.
Innovation Solution
A mobile communication device with a human body recognition function that includes a sensing pad and a sensor with adjustable sensitivity, allowing it to distinguish between human bodies and non-human objects by switching between detection modes and adjusting output power accordingly, ensuring proper power management and communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor operates at high sensitivity to detect human bodies, then human body detection accuracy is improved, but false detection of non-human objects increases
Solution Approach 1:
The sensor dynamically switches between high sensitivity mode (for human body detection) and low sensitivity mode (for non-human object detection) based on the detected induction signal characteristics. This dynamic adjustment allows the system to achieve high detection accuracy while minimizing false detections by adapting the sensitivity level to the current detection scenario
Solution Approach 2:
The system changes the sensitivity parameter of the sensor based on the type of object detected. When a human body is detected (induction signal exceeds threshold), high sensitivity mode is activated; otherwise, low sensitivity mode is used. This parameter change enables the system to optimize detection performance for different object types
2Object-affected harmful factors
If the output power is reduced when any object approaches, then SAR compliance is improved, but communication quality deteriorates and power consumption increases
Solution Approach 1:
The system applies different power adjustment strategies based on the local condition of the detected object. When a human body is detected, output power is reduced to ensure SAR compliance; when non-human objects are detected, output power remains unchanged to maintain communication quality. This localized quality adjustment resolves the contradiction by tailoring the response to the specific object type
3Object-affected harmful factors
If the output power is reduced when any object approaches, then SAR compliance is improved, but power consumption increases
Solution Approach 1:
The system applies power reduction only in the specific case when a human body is detected, rather than reducing power for all approaching objects. This selective approach ensures SAR compliance when necessary while avoiding unnecessary power consumption when non-human objects are detected, thus resolving the contradiction between safety compliance and energy efficiency
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 differentiates between human bodies and non-human objects, preventing unnecessary power reduction and maintaining communication quality by adjusting output power only when a human body is detected, thus complying with safety regulations while optimizing power consumption.
Implementation Method 1
When a target object approaches the mobile communication device, an induction signal (e.g. the capacitance difference value) is generated between the sensing pad and the target object
Data Source
AI summary
A mobile communication device with a human body recognition function includes sensing pad and a sensor. The sensing pad is electrically connected to the sensor. When a target object approaches the mobile communication device, an induction signal is generated between the sensing pad and the target object. The sensor receives the induction signal, and the sensor includes a first sensitivity and a second sensitivity. When no target object approaches the mobile communication device, the sensor is set at the first sensitivity. When the sensor receives the induction signal, the first sensitivity is switched to the second sensitivity. The induction signal is converted into a first signal and the first sensitivity is compared with a default value. If the first signal is greater than the default value, the target object is determined as a human body and a power adjustment unit is adjusted to reduce an output power.