Wireless Power Calibration for Accurate Foreign Object Detection

The patent performs initial power calibration before the power transfer phase to establish baseline calibration values for transmitted and received power. This preliminary calibration action accounts for the specific magnetic coupling conditions and load characteristics at the start of operation, enabling accurate power measurement throughout the charging process without requiring continuous complex recalibration.

The patent performs subsequent power calibration during the power transfer phase when load conditions or magnetic coupling changes are detected. By dynamically adjusting calibration parameters based on actual operating conditions (such as changes in load current, voltage, or coupling coefficient), the system maintains high measurement precision without requiring complete recalibration, thus balancing accuracy with system simplicity.

The patent performs initial power calibration before the power transfer phase to establish accurate baseline values for transmitted and received power. This preliminary calibration ensures that when foreign object detection is performed during power transfer, the power loss calculation (difference between transmitted and received power) is based on accurate calibrated values, enabling precise detection without requiring time-consuming recalibration during operation.

The patent performs subsequent power calibration during the power transfer phase when changes in load or coupling are detected, ensuring continuous accuracy of power measurements. This allows foreign object detection to maintain high precision throughout the charging process by using up-to-date calibration data, without interrupting the charging operation for extensive recalibration procedures.

The patent performs initial power calibration before the power transfer phase and then performs subsequent calibration periodically during power transfer only when changes in load conditions or magnetic coupling are detected. This periodic calibration approach ensures the system adapts to environmental changes (such as variations in coupling coefficient or load characteristics) while minimizing interruptions to power transfer, thus maintaining high productivity.

The patent dynamically adjusts the calibration frequency based on actual operating conditions. Instead of performing fixed-frequency calibration, the system monitors for changes in load current, voltage, or coupling parameters and triggers subsequent calibration only when such changes exceed predefined thresholds. This dynamic approach ensures adaptability to environmental changes while avoiding unnecessary calibration operations that would reduce power transfer efficiency.