Wireless charging foreign matter detection method, system and device and medium

By applying a sweep frequency excitation signal to the wireless charging system and combining multidimensional impedance characteristics and bidirectional digital authentication, the problem of difficulty in balancing detection reliability, cost and real-time security in existing technologies is solved, and high-sensitivity and fast-response foreign object detection is achieved during full-power charging.

CN122419019APending Publication Date: 2026-07-17YINFER HUICHONG (ZHEJIANG) TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610249705.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing wireless charging foreign object detection technologies struggle to balance detection reliability, system cost, and real-time safety, making it impossible to achieve continuous, accurate, and interference-free foreign object monitoring during full-power charging.

Method used

By applying a frequency sweep excitation signal to the transmitting coil, the voltage and current responses of the coupling system are collected, multidimensional impedance characteristics are extracted and compared with preset foreign object judgment criteria, and bidirectional digital authentication is performed simultaneously to collaboratively determine safety risks, prohibit full-power charging and trigger abnormal handling.

Benefits of technology

It improves the sensitivity and accuracy of foreign object detection, reduces the false alarm rate, and ensures high safety and real-time response capabilities during full-power charging.

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Abstract

The invention discloses a wireless charging foreign matter detection method, system and device and a medium, and the method comprises the steps: applying a broadband sweep frequency excitation signal to a transmitting coil, collecting voltage response and current response, extracting multi-dimensional impedance features, and comparing the features with a preset foreign matter judgment standard to obtain a deviation result; a bidirectional digital authentication operation is executed between a transmitting end and a receiving end based on a pre-configured secret key, and an authentication result is obtained through encrypted challenge-response interaction and communication credibility verification; a deviation result and an authentication result are put together for collaborative judgment; only when the deviation result and the authentication result both meet the preset safety condition, a normal charging process is entered. According to the invention, high-sensitivity identification of metal foreign matters and non-metal foreign matters is realized, powerful safety guarantee for authenticity of communication data is provided, and high-reliability safety protection of millisecond-level response is realized in a full-power charging process.
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