Wireless Power Foreign Object Detection With Dual Loss Thresholds
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Solution Overview
Problem
Existing wireless power transmission systems face issues with false detection of foreign objects due to the reliance on power loss thresholds, leading to inaccurate determinations of object presence.
Innovation Solution
Implementing a dual-threshold system where a first threshold determines foreign object existence, a second threshold determines non-existence, and a third threshold indicates a possibility of object presence, with thresholds adjusted based on maximum power and uncertainty to minimize false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power loss threshold is used to detect foreign objects, then the detection process is simple, but false detections occur due to measurement uncertainties and varying power levels
Solution Approach 1:
The single threshold detection method is segmented into a dual-threshold system with a first threshold for determining foreign object existence and a second threshold for determining non-existence. This segmentation allows the system to account for measurement uncertainties by creating distinct decision regions, thereby reducing false detections while maintaining manageable system complexity.
Solution Approach 2:
The invention changes the parameter of threshold values from a fixed single value to variable values that depend on the set transmission power. The first and second thresholds are adjusted based on the maximum power and uncertainty at different power levels, allowing the detection system to adapt to varying operating conditions and reduce false detections.
2Productivity
If transmission power is increased to improve power transmission efficiency, then power loss detection becomes less reliable due to increased measurement uncertainty
Solution Approach 1:
The threshold values are made dynamic rather than fixed, adjusting automatically based on the set transmission power level. As transmission power increases and measurement uncertainty increases, the thresholds are相应ly adjusted to maintain reliable foreign object detection. This dynamic adaptation allows the system to maintain both high power transmission efficiency and accurate detection across varying power levels.
Solution Approach 2:
The invention changes the parameters of the thresholds to vary with transmission power levels. The first threshold is set higher and the second threshold is set lower when transmission power is higher, creating a wider margin that accounts for increased measurement uncertainty at higher power levels. This parameter adaptation resolves the contradiction between transmission efficiency and measurement precision.
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
The dual-threshold system effectively reduces false detections by accounting for varying power levels and measurement uncertainties, ensuring accurate foreign object detection in wireless power transmission.
Implementation Method 1
a power transmitting apparatus that wirelessly transmits power to a power receiving apparatus
Data Source
AI summary
A power transmitting apparatus sets, on the basis of transmission power set with the power receiving apparatus, a first threshold for determining whether or not a foreign object exist, and a second threshold lower than the first threshold. The first and second threshold are set so that the difference between the first and second threshold values becomes larger as the set transmission power becomes larger. The power transmitting apparatus determines: that a foreign object exists in a case where the power loss is greater than the first threshold; that a foreign object does not exist in a case where the power loss is less than the second threshold; and that there is a possibility of a foreign object existing in a case where the power loss is between the first threshold and the second threshold.