磁悬浮式电磁-摩擦复合生物机械能量采集器  

Electromagnetic-triboeletric hybridized generator based on magnetic levitation for scavenging biomechanical energy

作　　者：温涛[1] 何剑[1] 张增星[1] 田竹梅[1,2] 穆继亮 韩建强[1] 丑修建[1] 薛晨阳[1] 

机构地区：[1]中北大学,电子测试技术重点实验室,太原030051 [2]忻州师范学院电子系,忻州034000

出　　处：《物理学报》2017年第22期289-300,共12页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2015AA042601);国家自然基金(批准号:61525107,51605449,51422510,51675493)资助的课题~~

摘　　要：能量采集技术已经成为智能终端领域的一项关键技术,关于人体机械能采集方式也有大量的研究.针对人体机械能采集的应用需求,本文提出一种基于磁悬浮结构的电磁-摩擦复合式能量采集器.该能量采集器以磁悬浮结构作为核心部件,具有结构简单、感应灵敏、输出功率高的优点.在10 MΩ的外接负载时,两组摩擦发电单元输出功率分别为0.12 mW和0.13 mW;在1kΩ外接负载时,两组电磁发电单元的输出功率分别为36 mW和38 mW.复合能量采集器通过电容储能后,电容器可以输出8 V电压,且输出信号为持续的直流信号,可以为计步器提供持续的能量供给,支撑计步器正常工作.设计的复合能量采集器对于可穿戴电子设备自供电工作模式的实现具有重要意义.The popularity of various portable electronics and biological health monitoring devices, such as pedometers, pulse oximeters, mobile telephones, wearable watches, has greatly changed our lifestyles and brought significant convenience to us. Energy harvesting has been a key technology for the self-powered mobile terminals, because there are many defects such as limited lifetime, large size, low energy density and environmentally unfriendly feature for the traditional chemical batteries. Lots of devices used for the energy harvesting of the human movement have been reported. However, some problems such as poor efficiency, low output power and low sensitivity need further studying.In this work, we demonstrate a novel magnetically levitated electromagnetic-triboelectric generator. The device size is φ4.8 cm x 2.4 cm, and its weight is 80 g. The device uses the magnetically levitation structure as the core components,and the structure contains four magnets to form a magnetic array, in which three cylindrical magnets are placed around a bigger magnet. And two coils with polyvinyl-acetal enameled copper wires of 70 μm areplaced at the top and bottom of the device, respectively. Then two silica gel thin films with inverted tetrahedron patterned on the surface are integrated inside the structure. Then, we analyze the motion feature with the Maxwell simulation software, and discuss output characteristics of the two energy harvest units theoretically.The device possesses a high sensitivity, wide frequency response and high output performance. The dynamic response characteristics are analyzed in this paper. The frequency response range of the device is from 2 Hz to 20 Hz. The wider frequency response means that it can harvest more energy from complicated external environment. Furthermore, we analyze the output signal at low frequency, which has more than one wave crest after an environment perturbation. The triboelectric units can deliver peak output voltages of 70 V and 71 V, respectively, and the electromagnetic units ea

关 键 词：磁悬浮 复合发电机 摩擦发电机 自供电计步器 

分 类 号：TM619[电气工程—电力系统及自动化]