The invention provides a foreign matter detection method for wireless charging, a foreign matter detection device and a wireless charging system. The specific implementation scheme is as follows: determining a first sweep frequency range according to the current resonant frequency of the parallel resonant network; based on the first frequency sweep range, performing frequency sweep on the parallel resonance network by using a frequency sweep signal generator, and determining an actual impedance frequency curve at the current detection moment; determining a predicted impedance frequency curve at the current detection moment according to historical foreign matter detection data; and comparing an actual extreme point of the first high-order function corresponding to the actual impedance frequency curve with a predicted extreme point of the second high-order function corresponding to the predicted impedance frequency curve, and determining whether foreign matters exist in the transmitting coil of the wireless charging system at the current detection moment or not according to a comparison result. According to the scheme disclosed by the invention, the robustness of foreign matter detection during wireless charging can be improved, and small foreign matters can be accurately detected.

    本公开提供了无线充电的异物检测方法、异物检测装置及无线充电系统。具体实现方案为:根据并联谐振网络的当前谐振频率,确定第一扫频范围;基于第一扫频范围,利用扫频信号发生器对并联谐振网络进行扫频,确定当前检测时刻的实际阻抗频率曲线;根据历史异物检测数据,确定当前检测时刻的预测阻抗频率曲线;将实际阻抗频率曲线对应的第一高次函数的实际极值点与预测阻抗频率曲线对应的第二高次函数的预测极值点进行比较,根据比较结果确定当前检测时刻无线充电系统的发射线圈是否存在异物。根据本公开的方案,可以提升无线充电时的异物检测的鲁棒性,且可以实现对小型异物进行准确检测。


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    Title :

    Foreign matter detection method and foreign matter detection device for wireless charging and wireless charging system


    Additional title:

    无线充电的异物检测方法、异物检测装置及无线充电系统


    Contributors:
    ZHANG WEI (author) / WEN FENG (author) / WU RUCHUN (author) / HE CHAO (author)

    Publication date :

    2024-12-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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