Power Receiver Timing Control for Waveform-Decay Object Detection
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in accurately detecting foreign objects using waveform attenuation methods, particularly when the situation becomes unsuitable for foreign object detection, leading to potential power transfer issues and safety concerns.
Innovation Solution
A power receiving device is designed to perform appropriate control based on waveform attenuation by limiting power transfer and using a waveform decay method for foreign object detection, which involves measuring the attenuation rate of the transmitted power waveform to determine the presence of foreign objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If waveform attenuation method is used for foreign object detection, then detection capability is improved, but reliability deteriorates when situation becomes unsuitable for detection
Solution Approach 1:
The patent applies dynamics by making the foreign object detection method adaptable to changing situations. The power receiving device dynamically selects between waveform attenuation method and waveform decay method based on whether the current situation is suitable for detection, thereby maintaining high reliability across different operating conditions.
Solution Approach 2:
The patent changes the detection parameter from fixed waveform attenuation to variable selection between waveform attenuation and waveform decay methods. By monitoring suitability conditions and switching between methods, the system maintains accurate foreign object detection regardless of situational changes.
2Productivity
If power transmission is continuously performed, then productivity is improved, but safety deteriorates due to potential foreign object hazards
Solution Approach 1:
The patent maintains continuous power transmission by seamlessly switching between waveform attenuation method and waveform decay method for foreign object detection. This continuous detection capability ensures safety without interrupting the power transmission process, thereby maintaining productivity.
Solution Approach 2:
The system implements feedback by continuously monitoring foreign objects through waveform analysis and adjusting power transmission accordingly. The power receiving device provides feedback about detection results, enabling real-time safety control while maintaining continuous operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of foreign object detection, preventing power transfer errors and ensuring safety by reliably identifying foreign objects through precise measurement of waveform attenuation indices.
Implementation Method 1
a power receiving device configured to receive power wirelessly from a power transmission device
Implementation Method 2
measuring the attenuation rate of the transmitted power waveform to determine the presence of foreign objects
Data Source
AI summary
Information about a transmission power control minimum period for performing foreign object detection using a waveform decay method is obtained from a power transmission device. The obtained transmission power control minimum period is compared with a transmission power control maximum period allowed for a power receiving device. In a case where the transmission power control minimum period that can be generated by the power transmission device is longer than the transmission power control maximum period allowed for the power receiving device, a flag indicating not to implement foreign object detection using the waveform decay method is set, and the fact that the transmission power control maximum period is set to zero is sent to the power transmission device.