Power receiving apparatus, power transmitting apparatus, control methods thereof, and a non-transitory computer-readable storage medium
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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 its actual existence, 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, thereby ensuring accurate detection.
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 preliminary detection of foreign objects before the power transmitting apparatus executes calibration processing. By detecting foreign objects in advance and notifying the power transmitting apparatus, the system prevents calibration from being performed when foreign objects are present, thereby maintaining detection accuracy while enabling reliable foreign object detection during power transmission.
2Ease of operation
If the power receiving apparatus transmits data for first foreign object detection, then the power transmitting apparatus can perform detection during power transmission, but the detection accuracy lowers if calibration is performed with foreign objects present
Solution Approach 1:
The system performs preliminary foreign object detection by the power receiving apparatus before the power transmitting apparatus conducts calibration processing. This preliminary action ensures that calibration only occurs when no foreign objects are present, maintaining detection precision while enabling easy operation of foreign object detection during power transmission.
Solution Approach 2:
The power receiving apparatus acts as an intermediary by performing initial foreign object detection and communicating results to the power transmitting apparatus. This intermediary role prevents the power transmitting apparatus from executing calibration when foreign objects are present, thereby maintaining detection precision without complicating the overall operation.
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.