Dynamic Radiation Power Adjustment via Capacitance Sensing
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Solution Overview
Problem
Existing electronic devices face challenges in accurately adjusting radiation power to minimize specific absorption rate (SAR) as users move closer or further, due to the increasing number of radiating antennas, which can lead to excessive radiation exposure.
Innovation Solution
The electronic device employs a plurality of metal sensing members oriented in different directions, connected to a test sensor with signal channels, allowing the processor to detect capacitance variations and adjust radiation power accordingly, thereby reducing SAR while maintaining normal communication functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more radiating antennas are added to enhance communication functions, then communication capability is improved, but radiation exposure to users increases
Solution Approach 1:
The patent implements dynamic radiation power adjustment by detecting user proximity through capacitance sensing and automatically adjusting the transmit power of radiating antennas in real-time. The system transitions from static fixed power transmission to dynamic adaptive power control, reducing radiation exposure when users are nearby while maintaining communication capability when users are absent.
Solution Approach 2:
The patent employs feedback mechanisms where capacitance sensors continuously monitor user proximity and feed this information back to the power control system. The system adjusts radiation power based on this feedback loop, creating a closed-control system that automatically responds to user presence and maintains optimal radiation levels.
2Object-affected harmful factors
If radiation power is reduced to minimize specific absorption rate, then user safety is improved, but communication function may be affected
Solution Approach 1:
The system dynamically adjusts radiation power based on real-time user proximity detection rather than maintaining a fixed low power level. When users are detected nearby, power is reduced to minimize SAR; when users are absent, power increases to maintain optimal communication function, thus resolving the contradiction between safety and performance.
Solution Approach 2:
The patent changes the radiation power parameter adaptively based on user proximity conditions. The system modifies transmit power levels dynamically according to detected capacitance changes, ensuring SAR compliance during user contact while maintaining sufficient power for communication when users are not present.
3Measurement precision
If user proximity detection accuracy is improved to adjust radiation power, then radiation control precision is improved, but device complexity increases
Solution Approach 1:
The patent repurposes existing antenna structures to serve dual functions: both radiating electromagnetic waves for communication and sensing user proximity through capacitance changes. This multi-functionality approach improves proximity detection accuracy without adding separate dedicated sensing components, thus avoiding increased device complexity.
Solution Approach 2:
The system uses its own antenna structures to perform both communication and proximity sensing functions. The antenna system serves itself by detecting capacitance changes caused by user proximity, eliminating the need for external or additional sensing components and maintaining device simplicity while achieving accurate detection.
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 solution enables multi-directional detection of user proximity, improving accuracy and reducing radiation impact on users by dynamically adjusting radiation power based on capacitance changes, ensuring compliance with SAR standards.
Implementation Method 1
a test sensor, having a plurality of signal channels, each signal channel being connected to at least one metal sensing member through a signal wire
Data Source
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Figure 3
Figure 3
AI summary
Provided are an electronic device, and a radiation power adjustment method and apparatus. The electronic device includes: a plurality of metal sensing members, including at least two metal sensing members with sensing regions facing different directions; a test sensor, including at least two signal channels, wherein a plurality of signal channels are connected to corresponding at least one metal sensing member through signal wires respectively, and the test sensor is configured to acquire a first capacitance variation when a distance between the sensing region and a user changes; and a processor, connected to the test sensor, the processor being configured to adjust a radiation power of a radio frequency circuit in the electronic device according to the received first capacitance variation.