基于可穿戴设备的微型磁耦合谐振无线充电系统的分析

Analysis of a Small Charging System for Wearable Devices Based on Magnetic Coupling Resonance

近几年,越来越多的可穿戴设备走进人们的生活。但对大多数可穿戴设备而言,电池续航时间短,充电困难已经成为用户普遍反映的问题,磁耦合谐振无线能量传输技术能够为可穿戴设备提供方便,安全的能量供应。由于可穿戴设备体积小,因此设计一种小尺寸的无线充电系统十分必要。本文通过对谐振线圈进行仿真分析,得到了影响线圈谐振频率的关键设计参数。在此基础上设计出了小小匹配的谐振系统和新型的大小匹配的谐振系统,并且系统中小谐振线圈的体积仅为0.675cm3,能够满足可穿戴设备的体积需求。对两谐振系统的传输效率进行实验分析,结果表明大小匹配的谐振系统具有更好的能量传输性能,在可穿戴设备领域具有良好的应用前景。

As more and more wearable devices come into people’s lives, the short duration of the battery and charging difficulties of wearable devices need more focus. Magnetic coupling resonance wireless energy transmission technology can provide convenient and safe energy supply for wearable devices. Wearable devices are small in size, and it is necessary to design a small size wireless charging system. In this paper, the relationship between coil parameters and resonant frequency are modeled by simulation, and the key parameters are obtained. On the basis of simulation, two systems are designed, one consists of two same small size coils, the other consists of a big size coil and a small size coil, and the volume of the small size coil is only 0.675cm3, it can meet the requirements of wearable devices. In addition, the transmission efficiency of the two systems is analyzed, and the results show that this new system has high transmission performance and a good application prospect in the field of wearable devices.