Proximity Sensor State Detection for Safe Antenna Power Limiting
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Solution Overview
Problem
Mobile terminals' radiation levels cannot be effectively monitored by proximity sensors like SAR sensors, leading to potential harm to users when radiation exceeds safe limits, as these sensors fail to detect abnormalities in radiation levels, resulting in high antenna transmitting power and increased electromagnetic wave exposure.
Innovation Solution
A method and apparatus for detecting the state of a proximity sensor in mobile terminals, which involves sending predetermined instructions to the sensor to determine if it is abnormal by measuring capacitance values and communication states, and adjusting antenna transmitting power accordingly to maintain low power levels when the sensor is non-functional, thereby reducing radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proximity sensor is used to monitor radiation levels, then user safety can be improved, but the sensor may fail to detect abnormalities resulting in high antenna transmitting power
Solution Approach 1:
The system performs preliminary detection of the proximity sensor's operational status before relying on it for radiation monitoring. By sending predetermined instructions and evaluating feedback results in advance, the system ensures the sensor is functional before using it to control antenna power, preventing the scenario where a failed sensor leads to excessive radiation exposure.
Solution Approach 2:
The system establishes a feedback mechanism where the proximity sensor continuously reports its detection status to the control unit. When the sensor detects abnormal conditions or fails to respond appropriately, the feedback signal triggers the control unit to maintain the antenna at low power levels, thereby preventing harmful radiation exposure while ensuring reliable monitoring.
2Object-affected harmful factors
If the antenna transmitting power is maintained at low power when sensor is abnormal, then radiation exposure is reduced, but device functionality may be compromised
Solution Approach 1:
The antenna transmitting power is dynamically adjusted based on the real-time operational status of the proximity sensor. When the sensor is functional, the antenna operates at normal power levels to maintain device functionality. When the sensor is abnormal or fails, the system automatically transitions to low power mode to reduce radiation exposure, thus adapting the power level to the current safety conditions.
Solution Approach 2:
The system changes the antenna transmitting power parameter from high to low based on the detected sensor status. This parameter change is triggered when the proximity sensor fails to provide valid feedback or detects abnormal conditions, ensuring that radiation exposure is reduced while maintaining communication functionality at acceptable levels.
3Object-affected harmful factors
If real-time power adjustment is enabled based on sensor signals, then radiation control is improved, but system complexity increases
Solution Approach 1:
The proximity sensor performs self-detection of its own operational status and automatically provides feedback signals to the control unit. This self-service mechanism eliminates the need for complex external monitoring systems, as the sensor itself reports whether it is functioning properly and detecting abnormal conditions, thereby simplifying the overall control system while maintaining effective radiation control.
Solution Approach 2:
The control unit is designed with multi-functionality, handling both the evaluation of sensor feedback and the control of antenna power transmission through a single integrated component. This universal approach reduces system complexity by consolidating multiple functions into one unit, avoiding the need for separate dedicated circuits for sensor evaluation and power control.
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
Ensures user safety by reducing antenna transmitting power when the proximity sensor is abnormal, preventing excessive radiation exposure and maintaining normal device functionality, while allowing for real-time power adjustments based on sensor signals when the sensor is functional.
Implementation Method 1
determining whether the proximity sensor is abnormal based on a feedback result of the proximity sensor to the predetermined instruction; and maintaining the antenna transmitting power at a low power when the proximity sensor is abnormal
Data Source
AI summary
A method for detecting the state of the proximity sensor, applied to a terminal including the proximity sensor and an antenna, includes: sending a predetermined instruction to the proximity sensor; determining whether the proximity sensor is abnormal based on a feedback result of the proximity sensor to the predetermined instruction; and maintaining the antenna transmitting power at a low power if the proximity sensor is abnormal. Through the feedback of the proximity sensor to the request to obtain the capacitance value, it is determined whether the proximity sensor can work normally, and in a case that the proximity sensor cannot work normally, the antenna transmitting power is reduced to avoid the continuous high antenna transmitting power due to the inability of the proximity sensor to work normally, which reduces the radiation to the human body.