Wireless Power Control via Multi-Sensor Fusion
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Solution Overview
Problem
Existing electronic devices face challenges in accurately reducing RF output power to comply with SAR regulations, as sole reliance on proximity sensors can result in false detections and unnecessary power reduction, leading to potential user harm.
Innovation Solution
The use of a combination of sensors, including a first and second proximity sensor with different sensing directions, and a movement sensor, allows a controller to dynamically adjust the output power of a wireless communication component based on multiple inputs, ensuring compliance with SAR limits while minimizing unnecessary power reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single proximity sensor is used to detect user proximity, then the device can reduce RF output power to comply with SAR regulations, but false detections occur leading to unnecessary power reduction
Solution Approach 1:
The patent combines multiple proximity sensors (first proximity sensor and second proximity sensor with different sensing directions) to detect objects from different orientations. By merging their detection results, the system achieves more reliable proximity detection and reduces false positives, thereby maintaining wireless communication performance while ensuring SAR compliance.
Solution Approach 2:
The system continuously monitors proximity sensor outputs and movement sensor data, using this feedback to dynamically adjust RF output power. The controller processes real-time sensor feedback to determine whether to reduce power, enabling accurate response to actual user proximity conditions and avoiding unnecessary power reduction.
2Object-affected harmful factors
If RF output power is reduced based on proximity sensor detection, then SAR compliance is achieved, but user harm may still occur due to false detections
Solution Approach 1:
The patent merges data from multiple proximity sensors positioned with different sensing directions and combines it with movement sensor data. This multi-sensor fusion approach significantly reduces false detections, ensuring that RF power is reduced only when a user is truly in close proximity, thereby reliably preventing harmful RF energy absorption.
Solution Approach 2:
The system employs proximity sensors with different sensing directions (first proximity sensor and second proximity sensor) to cover different spatial zones. Each sensor monitors its specific direction, and the controller integrates these localized detection results to make accurate proximity determination, ensuring reliable harm prevention.
3Reliability
If multiple sensors are used to improve detection accuracy, then false detections are reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple proximity sensors with different sensing directions and integrates their outputs with movement sensor data through a controller. This merging of sensors provides robust false detection reduction while managing complexity through coordinated processing of sensor inputs.
Data Source
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AI summary
An example electronic device includes a wireless communication component and a controller. The controller is to set an output power of the wireless communication component based on: whether a first external object is in proximity to a first side of the electronic device; whether the electronic device is stationary; and whether a second external object is in proximity to a second side of the electronic device, where the second side is opposite to the first side.