A miniaturized human-motion energy harvester using flux-guided magnet stacks

16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Halim, M.A.^1,2 ; Park, J.Y.^1

Department of Electronic Engineering, Kwangwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul

139-701, Korea, Republic of^1

Department of Mechanical Engineering, University of Utah, 50 S. Central Campus Drive, Salt Lake City

UT

84112, United States^2

关键词: Electronic load;    Electronic systems;    Helical compression springs;    High frequency HF;    High frequency oscillations;    Mechanical impacts;    Rectifier circuit;    State-of-the-art devices;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/773/1/012089/pdf
DOI  :  10.1088/1742-6596/773/1/012089

来源: IOP

【 摘 要 】

We present a miniaturized electromagnetic energy harvester (EMEH) using two flux-guided magnet stacks to harvest energy from human-generated vibration such as handshaking. Each flux-guided magnet stack increases (40%) the magnetic flux density by guiding the flux lines through a soft magnetic material. The EMEH has been designed to up-convert the applied human-motion vibration to a high-frequency oscillation by mechanical impact of a spring-less structure. The high-frequency oscillator consists of the analyzed 2-magnet stack and a customized helical compression spring. A standard AAA battery sized prototype (3.9 cm3) can generate maximum 203 μW average power from human hand-shaking vibration. It has a maximum average power density of 52 μWcm-3which is significantly higher than the current state-of-the-art devices. A 6-stage multiplier and rectifier circuit interfaces the harvester with a wearable electronic load (wrist watch) to demonstrate its capability of powering small- scale electronic systems from human-generated vibration.