Sensor-Based Transmission Power Control for SAR Reduction
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Solution Overview
Problem
Electronic devices face challenges in reducing specific absorption rate (SAR) of electromagnetic radiation while maintaining performance, especially when a protective cover is used, as existing solutions often degrade device performance by reducing transmission power unnecessarily.
Innovation Solution
A system that dynamically controls transmission power based on the presence of an object detected by sensors, such as hall sensors or proximity sensors, to selectively reduce SAR while maintaining effective device operation, including displaying status information through a transparent window when the cover is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced to lower SAR, then electromagnetic radiation absorption is reduced, but device communication performance deteriorates
Solution Approach 1:
The patent implements dynamic transmission power control that adjusts power levels in real-time based on detected object proximity. The system transitions between multiple power states (first power value when object is close, second power value when object is far) to optimize both SAR reduction and communication performance, rather than using a fixed reduced power level
Solution Approach 2:
The system changes the transmission power parameter based on the distance between the electronic device and the user's body. By detecting object proximity and adjusting the power parameter dynamically, the system achieves optimal balance between SAR compliance and communication effectiveness
2Object-affected harmful factors
If transmission power is reduced when protective cover is closed, then SAR is reduced, but device operation performance deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where sensors detect whether the protective cover is closed or opened, and this information feeds back to the processor to automatically adjust transmission power. The system also monitors communication quality and adjusts power accordingly, ensuring reliable operation while reducing SAR when appropriate
Solution Approach 2:
The system dynamically switches between different power modes based on the protective cover state and operational context, maintaining high power when needed for reliable communication and reducing power when the cover is closed to minimize SAR exposure
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
The system effectively reduces SAR without degrading device performance by adjusting transmission power according to the operational mode and presence of objects, preventing unnecessary power reduction in non-contact modes and ensuring efficient communication.
Implementation Method 1
the sensor device is a hall sensor for detecting a magnetic power of a magnet disposed in the protective cover
Implementation Method 2
the at least one sensor device detects an object located in proximity of the electronic device
Data Source
AI summary
A portable electronic device supporting wireless electronic communication comprises a display, at least one sensor device, a protective cover and a processor. The protective cover is mounted to selectively cover portions of the display and the at least one sensor device detects an object located in proximity of the electronic device. The processor controls transmission power in response to detection of the object located in proximity of the electronic device by the sensor device and in response to an operation mode associated with the protective cover.