Power transfer accounting for wireless power transfer
The wireless power transmitter uses coefficient-based power loss prediction and temperature compensation to detect foreign objects, enhancing detection accuracy and safety by adjusting power levels in response to thermal variations.
Patent Information
- Authority / Receiving Office
- GB · GB
- Patent Type
- Patents
- Current Assignee / Owner
- APPLE INC
- Filing Date
- 2024-09-12
- Publication Date
- 2026-06-11
AI Technical Summary
Existing wireless power transfer systems face challenges in detecting the presence of foreign objects within electromagnetic fields, which can lead to undesirable heating, and current methods may not effectively account for variations in friendly metal losses or temperature changes.
A method involving a wireless power transmitter that computes coefficients based on rectifier voltage and current measurements from the receiver, using regression analysis to predict power loss and detect foreign objects by comparing measured and predicted losses, with temperature compensation to adjust for thermal variations.
Effectively detects foreign objects by accurately predicting power loss, mitigating heating risks through power reduction or suspension, and adapting to temperature changes for improved reliability and safety.
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