Wireless Power Loss Reference Update for Foreign Object Detection
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in accurately detecting foreign objects due to changes in the state of power receiving apparatuses, which affects the calculated power loss and reduces detection accuracy.
Innovation Solution
A power transmitting apparatus is configured with a power transmitting unit, a communicating unit, a deriving unit, a foreign object detecting unit, and a detecting unit. When a change in the power transmission and reception state is detected, the deriving unit re-derives the data corresponding to the reference for power loss, allowing for improved foreign object detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power loss reference data is calculated in advance based on initial power transmission state, then foreign object detection can be performed using predetermined reference values, but detection accuracy deteriorates when the state of power receiving apparatuses changes
Solution Approach 1:
The power loss reference data is transformed from a static predetermined value to a dynamic value that is updated in real-time based on current power transmission state. The deriving unit continuously derives updated power loss reference data when power transmission is ongoing, allowing the foreign object detection to adapt to changes in the number or state of power receiving apparatuses while maintaining high detection accuracy
Solution Approach 2:
The system implements feedback by using the actual power transmission results to update the power loss reference data. The detecting unit monitors power transmission state, and when power transmission is detected, the deriving unit uses this feedback information to recalculate updated power loss reference data, which is then used for subsequent foreign object detection, creating a closed-loop system that maintains accuracy under varying conditions
2Measurement precision
If power loss reference data is updated when power transmission state changes, then foreign object detection accuracy is maintained, but system complexity and processing overhead increase
Solution Approach 1:
The system performs preliminary action by deriving updated power loss reference data in advance when power transmission state changes are detected. The detecting unit monitors for power transmission state changes, and when detected, the deriving unit proactively calculates updated reference data before foreign object detection is needed, ensuring accuracy is maintained without adding complexity during the actual detection process
Data Source
AI summary
A power transmitting apparatus derives data corresponding to a reference for power loss between the power transmitting apparatus and a power receiving apparatus on a basis of a value of reception power received from the power receiving apparatus; and performs a foreign object detection based on the data corresponding to the reference for power loss. The power transmitting apparatus re-derives the data corresponding to the reference for power loss, when a change in the power transmission and reception state is detected in a power-transmittal range of the power transmitting apparatus.