磁谐振式无线电能传输基于高频交变磁场耦合,当有金属异物侵入时,异物产生的涡流效应会给系统带来不可忽视的安全隐患。目前无线电能传输系统金属异物的检测主要基于异物造成的功率损耗和热效应,存在延时性高、参数提取复杂等缺陷。在此背景下,提出一种基于三级线圈的新型金属异物定位检测系统,第1、2级线圈均由2个并列矩形单元检测线圈构成,两级线圈布置方向相互垂直,实现金属异物在充电范围四分之一区域内的简单定位;第3级线圈由刚好覆盖发射线圈的4个等腰三角形单元检测线圈构成,实现金属异物在充电范围八分之一区域内的定位检测。以发射线圈面积为340 mm×280 mm的无线电能传输系统为载体进行验证,实验结果表明:当检测阈值电压低至1.4 V时,该异物检测系统能够有效检测到边长仅为20 mm的正方体铁块。
The magnetic resonant coupling based wireless power transfer utilizes the high-frequency alternating magnetic field coupling fundamentally. Once a metallic foreign body invades, the eddy current effect generated by the foreign body may bring considerable security risks to the system. At present, the detection methods of metallic foreign body in this wireless power transfer system are mainly based on power loss and thermal effect caused by foreign body. Its dominate disadvantages relay mainly on the high delay and complex parameter extraction. Under the background, a new detection system of metallic foreign body location based on three-stage coil is proposed in this paper. The first and second stage coils are composed of two parallel rectangular unit detection coils. The second stages coils are arranged perpendicular to each other to achieve the simple positioning of metallic foreign body in a quarter of the charging range. The third stage coil is composed of four isosceles triangular unit detection coils that just cover the transmitting coil. The locating detection of metallic foreign body within one eighth of the charging range is then realized. Finally, a magnetic resonant coupling based wireless power transfer system with an area of 340 mm×280 mm transmitting coil is applied for verification. It is shown that a square iron block with side length as small as 20 mm can be detected by the system when the threshold voltage is 1.4 V.
王跃跃,夏能弘.应用于无线电能传输系统的金属异物三级定位检测系统设计[J].电力科学与技术学报,2022,(2):205-212. WANG Yueyue, XIA Nenghong. A design of three-stage location and detection system for the metallic foreign body applied in the wireless power transfer system[J]. Journal of Electric Power Science and Technology,2022,(2):205-212.复制