Wireless Power Receiver Feedback for Foreign Object Detection
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Solution Overview
Problem
Existing wireless power transfer systems face issues with inaccurate foreign object detection, leading to potential heat generation or decreased power transmission efficiency due to unclear detection results, where power transmission is either continued despite a foreign object's presence or erroneously stopped when none is present.
Innovation Solution
The power receiving apparatus switches between two modes based on the response received from the power transmission apparatus, adjusting the interval of transmitting packets with information on received power, and reducing power reception when a predetermined response is not received, thereby enhancing the detection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If foreign object detection is performed using conventional methods, then power transmission can be stopped when a foreign object is detected, but detection accuracy is insufficient leading to either false positives or false negatives
Solution Approach 1:
The power receiving apparatus dynamically switches between first mode and second mode based on the received response, adapting the packet transmission interval to optimize detection accuracy while maintaining system reliability
Solution Approach 2:
The system uses feedback from the received response to adjust detection behavior - when a predetermined response is received, the system transitions to first mode with shorter intervals for enhanced detection, otherwise it maintains second mode with longer intervals
2Productivity
If packet transmission interval is shortened to improve detection speed, then detection process executes faster, but power reception efficiency decreases
Solution Approach 1:
The packet transmission interval is dynamically adjusted based on operational mode - first mode uses shorter intervals for rapid detection execution, while second mode uses longer intervals to maintain power reception efficiency
Solution Approach 2:
The system employs periodic packet transmission with variable intervals - transmitting packets at shorter intervals in first mode and longer intervals in second mode, balancing detection speed requirements with energy efficiency
3Loss of energy
If power transmission is continued to maintain efficiency, then power transmission efficiency is preserved, but heat generation risk increases when foreign object is present
Solution Approach 1:
The system continuously monitors transmission responses and adjusts power transmission based on feedback - maintaining efficient transmission when responses indicate normal operation, and reducing power when responses suggest foreign object presence
Solution Approach 2:
Power transmission level is dynamically adjusted based on detection mode - full power in second mode for efficiency, reduced power in first mode when detection sensitivity is increased
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 improves the accuracy of foreign object detection, reducing the risk of heat generation and maintaining power transmission efficiency by adaptively responding to detection outcomes.
Implementation Method 1
a power receiving apparatus according to the present disclosure wirelessly receives power from a power transmission apparatus
Data Source
AI summary
A power receiving apparatus includes a coil that wirelessly receives electric power from a power transmission apparatus, communication means for transmitting at a predetermined interval a signal for executing a detection process to detect an object, different from the power transmission apparatus or the power receiving apparatus, in accordance with a value of voltage or current at least at two time points in a predetermined period in which the power transmission apparatus restricts transmission of electric power and receives, from the power transmission apparatus, a response signal including a detection result based on the detection process executed in accordance with a signal transmitted, and control means for, in a case where the detection result included in the response signal received satisfies a predetermined condition, executing control such that the signal is transmitted at an interval shorter than a predetermined interval.