A Shared Method of Metal Object Detection and Living Object Detection Based on the Quality Factor of Detection Coils for Electric Vehicle Wireless Charging
A Shared Method of Metal Object Detection and Living Object Detection Based on the Quality Factor of Detection Coils for Electric Vehicle Wireless Charging
复制标题
DOI：
10.1109/tim.2023.3277132
复制
发表时间：
2023
影响因子：
5.6
通讯作者：
Ying Sun;Kai Song;Tian Zhou;Guo Wei;Zhiyuan Cheng;Chunbo Zhu
中科院分区：
文献类型：
--
作者：
Ying Sun;Kai Song;Tian Zhou;Guo Wei;Zhiyuan Cheng;Chunbo Zhu
大功率交变磁场会使进入无线充电区域的活体发生病变和病变。此外，对于金属物体（MO），涡流效应可能会导致安全风险，如火灾和点火危险。因此，金属物体检测（MOD）和活体物体检测（LOD）是无线功率传输（WPT）系统的必要功能。提出了一种基于品质因数的电动汽车无线充电（EVWC）检测线圈MOD和LOD共享方法，以实现同一检测线圈阵列的双重功能。首先，详细分析了金属氧化物（MO）和活体（LO）对探测线圈品质因数的影响。其次，提出了一种实时计算品质因数的方法来检测是否存在异物。设计了一种基于谐振电容电压相位变化趋势的异物类型判别算法。最后，一个3.3千瓦的实验样机，包括异物检测（FOD）系统，建立了验证的有效性。详细分析了品质因数作为FOD核心指标的优越性。在检测线圈上放置铁晶片、铝晶片和牛肉块的条件下，与没有异物的情况相比，检测线圈的品质因数计算结果分别降低了80.8%、50.5%和69.9%。同时，激励相对于谐振电容电压的相位差变为−61.3°、−74.6°和49.4°。
High-power alternating magnetic fields can cause lesions and pathological changes in living object bodies entering the wireless charging area. Also, as for metal objects (MOs), the eddy effect can cause the security risks such as fire and ignition hazards. Hence, metal object detection (MOD) and living object detection (LOD) are the necessary functions for a wireless power transfer (WPT) system. A shared method of MOD and LOD based on the quality factor of detection coils for electric vehicle wireless charging (EVWC) was proposed in this article to realize the dual functions by the same detection coil array. First, the effect of MOs and living objects (LOs) on the detection coil quality factor was analyzed in detail. Second, a method of real-time calculation of quality factor was proposed to detect whether the foreign object exists. Then, a distinction algorithm based on the phase variation trend of resonant capacitor voltage was designed to classify the type of foreign objects. Finally, a 3.3-kW experimental prototype, including a foreign object detection (FOD) system, was established to verify the validity. The advantage of the quality factor as the core indicator for FOD was analyzed in detail. Under the condition of an iron wafer, aluminum wafer, and beef chunk placed on the detection coil, the quality factor calculation results of the detection coil in contrast to those without foreign objects decreased by 80.8%, 50.5%, and 69.9%, respectively. Meanwhile, the phase difference of the excitation relative to the resonant capacitor voltage changed to −61.3°, −74.6°, and 49.4°.