Wireless Power Transfer Foreign Object Detection via Dynamic Calibration
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Solution Overview
Problem
Current wireless power transfer systems face limitations in calibration accuracy due to the need for quick calibration with only two varying power levels, which restricts the reliability of the load behavior model and affects system performance, especially when load requirements change beyond the calibrated scope.
Innovation Solution
The system employs advanced control circuitry and communication protocols to dynamically adjust power transfer based on feedback from the receiver, using multiple calibration power levels and generating a more accurate load behavior model, and incorporates foreign object detection techniques by comparing received power against a formulated model during the power transfer phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If calibration is performed quickly with only two varying power levels, then calibration time is reduced, but the accuracy and reliability of the load behavior model deteriorates
Solution Approach 1:
The system dynamically adjusts the number of calibration power levels based on operational requirements. During initial calibration, multiple power levels are used to build an accurate load behavior model. During subsequent foreign object detection phases, the system dynamically selects appropriate power levels from the pre-established model, eliminating the need for repeated full calibration while maintaining detection accuracy.
Solution Approach 2:
The system performs comprehensive calibration with multiple power levels in advance to pre-establish a detailed load behavior model. This preliminary action creates a reference framework that enables accurate foreign object detection during power transfer without requiring repeated time-consuming calibration procedures, thus resolving the contradiction between calibration speed and model accuracy.
2Reliability
If calibration power levels are limited by load state (e.g., high state of charge), then safety is maintained, but the reliability of the load behavior model outside these power levels deteriorates
Solution Approach 1:
The system performs comprehensive calibration with multiple power levels in advance to pre-establish a detailed load behavior model. This preliminary action creates a reference framework that enables accurate foreign object detection during power transfer without requiring repeated time-consuming calibration procedures, thus resolving the contradiction between calibration speed and model accuracy.
Solution Approach 2:
The system changes the parameter of calibration power levels by using multiple varying levels during the calibration phase, rather than being constrained to only two levels or limited by instantaneous load state. This allows the load behavior model to be trained across a broader power range, improving its reliability for foreign object detection during subsequent power transfer operations.
3Productivity
If foreign object detection uses a model built from limited calibration data, then detection speed is improved, but detection accuracy deteriorates when load requirements change beyond calibrated scope
Solution Approach 1:
The system performs comprehensive calibration with multiple power levels in advance to pre-establish a detailed load behavior model. This preliminary action creates a reference framework that enables accurate foreign object detection during power transfer without requiring repeated time-consuming calibration procedures, thus resolving the contradiction between calibration speed and model accuracy.
Solution Approach 2:
The system uses feedback from power transfer operations to validate and potentially update the load behavior model. By continuously comparing actual load responses against the pre-established model and incorporating new data, the system maintains both fast detection speed and high accuracy even when load requirements change beyond the original calibration scope.
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 reliability and accuracy of wireless power transfer by improving the load behavior model and enabling effective detection of foreign objects, thereby maintaining stable power delivery even when load requirements change.
Implementation Method 1
In inductive, wireless power transfer systems, an inductive power transmitter wirelessly transmits power to an inductive power receiver
Data Source
AI summary
A wireless power transmission system comprising a wireless power transmitting device and a wireless power receiving device. The wireless power receiving device is configured to regulate power drawn during a power transfer phase to maintain a substantially steady power level that is less than or equal to a power consumption level demanded by an associated load. The wireless power transmitting device is configured to determine the presence of a foreign object by monitoring the power transmitted or the power received and identifying a characteristic change in steady state power indicative of the presence of a foreign object.