A Micro-Power Generator Based on Two Piezoelectric MFC Films

Yongxin Ma,Chong Li,Xiaorui Fu,Jia Wang

doi:10.3390/cryst11080861

Abstract

In order to realize the collection of micro or small vibration energy, a micro-power generator based on two piezoelectric Macro Fiber Composite (MFC) films is proposed. The piezoelectric generator consists of a double piezoelectric MFCs type vibrator and a displacement amplifying mechanism, which can achieve the output of high energy density. The design process of this kind of piezoelectric generator is presented. Based on LabVIEW platform and NI Data Acquisition (DAQ) card, the output voltage acquisition system of the generator is built, and the output voltage and power are collected and calculated. Experimental results show that the maximum output power is 6.2 mW under transient excitation. Under continuous excitation with a load resistance of 10 kΩ and an excitation frequency of 26 Hz, the maximum output of the generator is up to 11.9 mW. The research results lay a foundation for the application of the proposed micro-power piezoelectric generator.

Highlights

With the development of science and technology, micromechanical mechanism plays an important role in various fields
In order to overcome the above problem, a micro-power generator based on two piezoelectric Macro Fiber Composite (MFC) films is proposed
In order to observe the deformation of the piezoelectric MFC films and the flexure strip under external excitation, the finite element analysis (FEA) of the proposed piezoelectric generator with ANSYS software was carried out

Summary

Introduction

With the development of science and technology, micromechanical mechanism plays an important role in various fields. The principle of piezoelectric micro-energy generation is to convert the mechanical energy generated by the vibration of the piezoelectric films into electrical energy. In terms of working principle, the cantilever type piezoelectric generator converts the mechanical energy generated by structural vibration into the electric energy generated by the elastic deformation of the piezoelectric element [6,7]. The piezoelectric stack type generator converts the elastic deformation of the piezoelectric stack into electrical energy, and it usually works in low-frequency mode [8,9]. The results show that the proposed hybrid energy harvester can generate an output power of 69.1 μW. Experimental results show that the harvester exhibits a high-peak power output of 50.8 mW across a matched resistor. An experimental platform is built to test the output characteristics of the micro-power generator

Design

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Experimental Analysis

Conclusions