The invention provides a metal foreign matter detection circuit and a non-blind area wireless charging metal foreign matter detection system, the circuit comprises four blind area detection coils distributed according to four quadrant planes, and the first and third quadrant blind area detection coils are connected to a first differential foreign matter detection circuit; the second quadrant blind area detection coil and the fourth quadrant blind area detection coil are connected to the second differential foreign matter detection circuit, the two differential foreign matter detection circuits are each internally provided with a differential amplification circuit, and one blind area detection coil is connected to one input end of the differential amplification circuit through an overcompensation signal collection channel. The other blind area detection coil is connected to the other input end of the differential amplification circuit through an under-compensation signal acquisition channel, and when the absolute value of the output voltage of the first differential foreign matter detection circuit or/and the second differential foreign matter detection circuit is higher than a preset threshold value, it is judged that metal foreign matter exists. The wireless charging system has the advantages that the whole area on the upper portion of the transmitting coil of the wireless charging system can be sensitively detected, and no detection blind area exists.
本发明提供一种金属异物检测电路及无盲区的无线充电金属异物检测系统,电路包括按四个象限平面分布的四个盲区检测线圈,其中第一与第三象限盲区检测线圈连接在第一差分异物检测电路上;第二与第四象限盲区检测线圈连接在第二差分异物检测电路上,两差分异物检测电路中均设置有差分放大电路,一个盲区检测线圈经过过补偿信号采集通道接入差分放大电路的一个输入端,另一盲区检测线圈经过欠补偿信号采集通道接入差分放大电路的另一个输入端,第一差分异物检测电路或/和所述第二差分异物检测电路的输出电压的绝对值高于预设阈值时,则判断为存在金属异物。其效果是:能够灵敏的检测无线充电系统发射线圈上部的整个区域,而没有任何的检测盲区。
Metal foreign matter detection circuit and non-blind area wireless charging metal foreign matter detection system
金属异物检测电路及无盲区的无线充电金属异物检测系统
2022-04-29
Patent
Electronic Resource
Chinese
European Patent Office | 2024
|European Patent Office | 2024
|Metal foreign matter detection coil structure of electric vehicle wireless charging system
European Patent Office | 2023
|Foreign matter detection apparatus and wireless charging system
European Patent Office | 2020
|