Wireless Power Calibration Using Magnetic Coupling Curves
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in accurately calibrating transmitted and received power due to changes in magnetic coupling and usage environments, which affects foreign object detection (FOD) accuracy.
Innovation Solution
The system includes a wireless power transmitter and receiver with communication/control units that adaptively calibrate power by constructing power calibration curves based on received power packets, and perform FOD by detecting changes in magnetic coupling and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power calibration is performed based on fixed parameters, then calibration process is simple, but calibration accuracy deteriorates due to changes in magnetic coupling and usage environments
Solution Approach 1:
The patent implements dynamic power calibration by constructing multiple power calibration curves under different operating conditions (different magnetic coupling strengths and usage environments) and adaptively selecting the appropriate curve during operation. This allows the system to maintain high calibration accuracy without requiring complex real-time recalibration, as the dynamic adaptation is achieved through pre-characterized curves selected based on current operating parameters.
Solution Approach 2:
The system changes calibration parameters by using different power calibration curves corresponding to different magnetic coupling strengths and environmental conditions. Instead of using fixed calibration parameters, the system selects from multiple pre-determined curves based on detected operating conditions, thereby maintaining accuracy across varying environments without increasing computational complexity.
2Measurement precision
If foreign object detection is performed with high sensitivity, then FOD accuracy is improved, but false detection increases due to power transfer variations
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors power transfer characteristics and compares them against the selected power calibration curve. By using the appropriate calibration curve based on current magnetic coupling conditions, the system can distinguish between normal power variations due to environmental changes and actual foreign object presence, thereby reducing false detections while maintaining high FOD accuracy.
Solution Approach 2:
The system dynamically adjusts detection thresholds and parameters based on the selected power calibration curve and current operating conditions. This dynamic adaptation allows the FOD mechanism to maintain high sensitivity while accounting for environmental variations, reducing false positives without compromising detection accuracy.
3Measurement precision
If power calibration curves are constructed for multiple operating conditions, then calibration accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-characterizing and storing multiple power calibration curves corresponding to different magnetic coupling strengths and usage environments before actual operation. During operation, the system simply selects the appropriate pre-characterized curve based on detected conditions, avoiding the need for complex real-time calibration calculations while maintaining high accuracy across varying environments.
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 enables precise power calibration and enhanced FOD, ensuring efficient and safe wireless power transfer even in varying environments.
Implementation Method 1
The wireless power transmitter and the wireless power receiver include various circuit components therein and configure independent devices, but since wireless power is transmitted therebetween by magnetic coupling
Implementation Method 2
The magnetic resonance method is similar to the magnetic induction method in that is uses a magnetic field. However, the magnetic resonance method is different from the magnetic induction method in that energy is transmitted due to a concentration of magnetic fields on both a transmitting end and a receiving end, which is caused by the generated resonance.
Data Source
AI summary
A wireless power transmitter including a power conversion unit configured to transmit wireless power generated based on magnetic coupling in a power transfer phase and a control unit configured to receive, from the wireless power receiver operating at a first operating point, a first received power packet of the first operating point and a second received power packet of the first operating point based on the first received power packet of the first operating point and the second received power packet of the first operating point and configured to receive a first received power packet of the second operating point and a second received power packet of the second operating point related to power calibration and construct a second power calibration curve based on the first received power packet of the second operating point and the second received power packet of the second operating point.