Wireless Power Calibration Control for Foreign Object Detection Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The accuracy of foreign object detection in wireless power transfer systems is compromised when calibration processing is performed assuming no foreign object is present, despite the object's actual presence, leading to inaccurate detection.
Innovation Solution
A power receiving apparatus that wirelessly receives power and transmits data to a power transmitting apparatus to execute first foreign object detection, with a determination unit checking if a predetermined condition is met for executing second foreign object detection before performing calibration processing, ensuring accurate detection by verifying the absence of a foreign object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calibration processing is executed to enable first foreign object detection, then the power transmitting apparatus can detect foreign objects during power transmission, but detection accuracy deteriorates when a foreign object is present during calibration
Solution Approach 1:
The power receiving apparatus performs a determination process before transmitting calibration data to check whether a foreign object is present. This preliminary check prevents calibration from being executed in the presence of a foreign object, ensuring that the baseline power loss values are established under normal conditions only.
Solution Approach 2:
The power receiving apparatus acts as an intermediary that verifies the transmission medium (space between transmitting and receiving apparatus) before calibration. By using the determination unit to check for foreign objects and only permitting calibration when safe, the system ensures accurate baseline measurements without direct interference from foreign objects.
2Productivity
If calibration processing is performed without verifying the absence of foreign objects, then the system operates simpler and faster, but detection precision deteriorates
Solution Approach 1:
A determination process is executed before calibration to check for foreign objects. This preliminary verification step ensures that calibration only proceeds when the transmission path is clear, maintaining both efficiency (by avoiding unnecessary recalibration) and precision (by ensuring accurate baseline measurements).
Solution Approach 2:
The system incorporates a feedback mechanism where the power receiving apparatus monitors the transmission environment and provides determination results to control whether calibration should proceed. This feedback loop ensures that calibration is performed only under appropriate conditions, maintaining detection accuracy without significantly impacting overall system productivity.
Data Source
AI summary
A power receiving apparatus capable of receiving power transmitted from a power transmitting apparatus capable of executing first foreign object detection and second foreign object detection, transmits, to the power transmitting apparatus, data to be used by the power transmitting apparatus to execute the first foreign object detection; before transmitting the data, determines whether a predetermined condition for the power transmitting apparatus to execute the second foreign object detection different from the first foreign object detection is satisfied; and transmits, to the power transmitting apparatus, a signal for causing the power transmitting apparatus to execute the second foreign object detection in accordance with the determination.