Wireless Power Transfer Negotiation for Accurate Foreign Object Detection
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Solution Overview
Problem
Existing wireless electric power transmission systems face inefficiencies and user inconvenience due to incomplete information exchange during foreign object detection, leading to incorrect requests for detection when objects are present or absent.
Innovation Solution
A power transmission apparatus equipped with a detection unit, communication unit, and request unit to continuously request information exchange until detection is complete, ensuring accurate foreign object detection by maintaining communication until the detection process is finished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the power reception apparatus requests ending of the Negotiation phase before information exchange for foreign object detection is completed, then the communication process can be terminated early, but foreign object detection becomes impossible or inefficient
Solution Approach 1:
The power reception apparatus is configured to determine whether foreign object detection is possible before the Negotiation phase ends. This preliminary determination ensures that the necessary information exchange is completed in advance, allowing the system to reliably assess detection capability before communication termination, thus resolving the contradiction between early termination and detection reliability
2Measurement precision
If foreign object detection is performed using waveform attenuation method, then detection capability is improved, but communication interruption during Negotiation phase causes detection inefficiency
Solution Approach 1:
The system performs preliminary determination of detection possibility before Negotiation phase termination. This allows the waveform attenuation-based foreign object detection to be properly configured and executed with high accuracy, while avoiding the inefficiency caused by communication interruptions, thus resolving the contradiction between detection accuracy and efficiency
Data Source
AI summary
A power transmission apparatus that wirelessly transmits electric power to a power reception apparatus includes a detection unit configured to detect whether an object different from the power transmission apparatus and the power reception apparatus exists, a communication unit configured to perform a communication with the power reception apparatus of information used for performing detection by the detection unit, and a request unit configured to make a request to the power reception apparatus for continuing the communication of information in a case where ending of the communication of information is requested from the power reception apparatus before the communication of information used for performing detection by the detection unit ends.