The invention provides a foreign matter detection method and device and a wireless charging system. The foreign matter detection device comprises a coil array and a foreign matter detection circuit, the coil array comprises at least one coil group, and each coil group comprises four detection coils with symmetrical positions. The foreign matter detection circuit can obtain induction signals generated by the detection coils; an abnormal value threshold value of each coil group is determined according to the induction signal of each coil group acquired in the first time period, and whether foreign matters exist or not is detected based on each abnormal value threshold value and the induction signal of each coil group; under the condition that no foreign matter is determined, the respective signal threshold value is determined according to the induction signal of each coil group; and then whether foreign matters exist or not is detected according to the signal threshold value of each coil group and the induction signal of each coil group acquired in the second time period. According to the technical scheme provided by the invention, the safety of wireless charging can be improved.

    本申请提供一种异物检测方法、装置和无线充电系统,其中,异物检测装置包括线圈阵列和异物检测电路,线圈阵列包括至少一个线圈组,每个线圈组中包括四个位置互为对称的检测线圈。异物检测电路可以获取各检测线圈产生的感应信号;然后根据在第一时间段获取的每个线圈组的感应信号确定每个线圈组的异常值阈值,再基于各异常值阈值和各线圈组的感应信号,检测是否存在异物;并可以在确定无异物的情况下,根据每个线圈组的感应信号确定各自的信号阈值;然后根据各线圈组的信号阈值和在第二时间段获取的各线圈组的感应信号,检测是否存在异物。本申请提供的技术方案可以提高无线充电的安全性。


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    Title :

    Foreign matter detection method and device and wireless charging system


    Additional title:

    异物检测方法、装置和无线充电系统


    Contributors:
    TANG CHUNSEN (author) / WANG ZHIHUI (author) / WANG YAOYI (author) / BAI PENGFEI (author) / WANG ZHENZHEN (author) / CAO JIAKAI (author) / KUANG WEI (author) / WU ZHIXIAN (author)

    Publication date :

    2021-11-09


    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 / G01V Geophysik , GEOPHYSICS



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