Design and experiment of a human-limb driven, frequency up-converted electromagnetic energy harvester
Design and experiment of a human-limb driven, frequency up-converted electromagnetic energy harvester
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DOI：
10.1016/j.enconman.2015.09.065
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发表时间：
2015-12-01
影响因子：
10.4
通讯作者：
Park, Jae Y.
中科院分区：
文献类型：
--
作者：
Halim, Miah A.;Cho, Hyunok;Park, Jae Y.
我们提出了一种频率上转换的电磁能量采集器，它可以从人体肢体运动(握手)中产生大量的能量。由于振动能量采集器产生的功率与工作频率成正比，所提出的能量采集器被设计成通过机械冲击将施加的低频振动上转换为高频振动。在激励时，圆柱形结构内的一个可自由移动的球(非磁性的)周期性地撞击悬挂在圆柱体两端的两个螺旋压缩弹簧上的两个磁铁，使这些磁铁以更高的频率振动。磁铁和线圈(缠绕在圆柱体外部)之间的相对运动会产生电动势。(电压)。通过设计参数(即频率、弹簧刚度、机械和电气阻尼)来设计高频振荡器，使功率损失最小。用激振器和手动握手两种方法制作了样机并进行了测试。制作的器件在激振器测试中表现出非共振行为。在最佳负载条件下，上变频发电机的平均功率为0.84 mW和0.96 mW。当该设备安装在智能手机上并进行握手时，串联Fugs的设备获得的最大平均功率为2.15兆瓦。制造的设备显示出0.33 mW cm(-3)的平均功率密度，与当前最先进的设备相比非常高，表明其能够从极低频率(类似于5赫兹)的振动中为便携式和可穿戴智能设备供电。(C)2015爱思唯尔有限公司。保留所有权利。
We present a frequency up-converted electromagnetic energy harvester that generates significant power from human-limb motion (hand-shaking). Because the power generated by a vibration energy harvester is proportional to the operating frequency, the proposed energy harvester has been designed to up-convert the applied low-frequency vibration to a high-frequency vibration by mechanical impact. Upon excitation, a freely moveable ball (non-magnetic) within a cylindrical structure periodically hits two magnets suspended on two helical compression springs located at either ends of the cylinder, allowing these to vibrate with higher frequencies. The relative motion between the magnets and coils (wrapped around the outside of the cylinder) induces e.m.f. (voltage). High-frequency oscillators have been designed through the design parameters (i.e., frequency, spring stiffness, mechanical, and electrical damping), to minimize the power loss. A prototype was fabricated and tested both using a vibration exciter and by manual hand-shaking. The fabricated device showed non-resonant behavior during the vibration exciter test. At optimum load condition, the frequency up-converted generators (FUGs) delivered 0.84 mW and 0.96 mW of average power. A maximum 2.15 mW of average power was obtained from the device with series connected FUGs while it was mounted on a smart phone and was hand-shaken. The fabricated device exhibited 0.33 mW cm(-3) of average power density, which is very high compared to the current state-of-the-art devices, indicating its ability in powering portable and wearable smart devices from extremely low frequency (similar to 5 Hz) vibration. (C) 2015 Elsevier Ltd. All rights reserved.