Wireless Power Receiver Calibration Gating for Foreign Object Detection
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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 integrating methods like Q-Factor measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration processing is executed to set power loss in normal state, then the power transmitting apparatus can detect foreign objects during power transmission, but detection accuracy lowers when foreign object is actually present during calibration
Solution Approach 1:
The power receiving apparatus performs preliminary foreign object detection before calibration processing by measuring the Q-factor of the power transmitting apparatus. If a foreign object is detected in this preliminary check, the apparatus determines not to execute calibration processing, thereby preventing inaccurate detection baseline establishment and maintaining detection accuracy.
Solution Approach 2:
The power receiving apparatus acts as an intermediary that mediates between the power transmitting apparatus and the foreign object detection process. It receives foreign object detection result information from the power transmitting apparatus, determines whether to proceed with calibration based on this information, and controls the transmission of calibration data accordingly.
2Measurement precision
If dual foreign object detection methods are implemented, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines two foreign object detection methods (Q-factor measurement by power transmitting apparatus and power loss method by power receiving apparatus) into a coordinated system. The power receiving apparatus integrates the ability to receive detection results, determine calibration execution, and control data transmission, merging multiple functions into a unified control flow that improves accuracy without proportionally increasing complexity.
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.