A handy-motion driven, frequency up-converted hybrid vibration energy harvester using PZT bimorph and nonmagnetic ball

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Halim, M.A.^1 ; Cho, H.O.^1 ; Park, J.Y.^1

Micro/Nano Devices and Packaging Lab., Department of Electronic Engineering, Kwangwoon University, 447-1 Wolgye-dong, Seoul, Nowon-gu

139-701, Korea, Republic of^1

关键词: Electromagnetic transducer;    Frequency up conversion;    Motion frequency;    Peak power densities;    Power densities;    Transduction mechanism;    Transverse impact;    Vibration energy harvesters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012042/pdf
DOI  :  10.1088/1742-6596/557/1/012042

来源: IOP

【 摘 要 】

We have presented a frequency up-converted hybrid type (Piezoelectric and Electromagnetic) vibration energy harvester that can be used in powering portable and wearable smart devices by handy motion. A transverse impact mechanism has been employed for frequency up-conversion. Use of two transduction mechanisms increases the output power as well as power density. The proposed device consists of a non-magnetic spherical ball (freely movable at handy motion frequency) to impact periodically on the parabolic top of a piezoelectric (PZT) cantilevered mass by sliding over it, allowing it to vibrate at its higher resonant frequency and generates voltage by virtue of piezoelectric effect. A magnet attached to the cantilever vibrates along with it at the same frequency and a relative motion between the magnet and a coil placed below it, induces emf voltage across the coil terminals as well. A macro-scale prototype of the harvester has been fabricated and tested by handy motion. With an optimum magnet-coil overlap, a maximum 0.98mW and 0.64mW peak powers have been obtained from the piezoelectric and the electromagnetic transducers of the proposed device while shaken, respectively. It offers 84.4μWcm-3peak power density.