面向无线电能传输系统的微元化涡流磁场异物检测技术研究

为提升系统安全性、电磁兼容性及稳定性，金属异物和活体检测技术成为无线充电技术中的研究热点之一。本项目针对目前异物和活体检测技术发展中存在的不足，提出基于微元化涡流磁场的金属异物数学建模方法，实现金属异物特征参数量化分析，为高精度金属异物检测技术的提出奠定理论基础。结合涡流磁场微元分析的金属异物数学模型，提出基于多单元协同矩阵线圈及其自适应切换控制策略的金属异物检测方法，有效解决传统方法在车辆存在强偏移情况下误检率高的问题，实现任意车辆位置下的高准确性金属异物检测。提出基于逐次逼近电容感应和调制电容感应技术相融合的互电容阵列活体检测方法，进一步提高活体检测系统的准确度。项目研究将构建高安全性、高电磁兼容性、高准确性的金属异物和活体检测技术体系，为我国电动汽车无线充电技术产业化和市场化普及起到重要的推动作用。

In order to improve the safety, electromagnetic compatibility and stability of the system, metal foreign object and living object detection technology has become one of the research hotspots in wireless electric vehicle charging technology. In view of the shortcomings in the development of metal foreign object and living object detection at present, this project proposes for the first time a modeling method of metal foreign objects and achieves quantitative analysis of characteristic parameters of metal foreign objects to build the theoretical foundation for the development of high precision metal foreign object detection technology. By this method, the accurate modeling of metal foreign object can effectively guide the design of detection circuit parameters and further obtain a high-precision metal foreign object detection circuit. Based on the modeling analysis method, a metal foreign object detection method based on multi-unit cooperative matrix coil and its adaptive switching control strategy is proposed. This method effectively solves the problem of high error detection rate for vehicles at offsets, and achieves efficient metal foreign object detection in any vehicle position. Furthermore, the project is the first to propose the method of mutual capacitance array in vivo detection in China with capacitance successive approximation induction and Sigma-Delta capacitance modulation induction technology applied to capacitance detection, which fills the research gap in living object detection in China. Based on the research, a high security, high efficiency, low cost metal foreign object and living object detection system is established, which promotes the industrialization and popularization of wireless electric vehicle charging technology in China.