阻抗匹配网络压电能量采集器的频域分析

Q2 Engineering
M. Bonnin, Kailing Song
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引用次数: 4

摘要

压电能量采集器是一种机电系统,能够将环境中分散的机械振动转化为可用的电能。它们可用于为无线连接、小型化和远程定位的传感器和执行器供电。在这项工作中,我们分析了压电能量采集器在频域的机械振动。考虑了随机振动的高斯白噪声和有色噪声模型。根据压电材料的力学特性、压电材料的特性关系和电负载的电路描述,推导了该收割机的控制方程。我们证明了能量采集器可以通过级联连接的机电双端口建模,并且频域方法是分析的完美工具。推导了收获功率和功率效率的计算公式。我们还表明,匹配网络的应用减少了机械和电气部分之间的阻抗不匹配,显著提高了收获的功率和功率效率。将匹配网络的解决方案与之前提出的解决方案(如功率因数校正的应用)进行了比较。我们表明,与功率因数校正的解决方案相比,匹配网络提供的平均功率和功率效率比未匹配的电阻性负载高9倍,并且收获的功率和效率增加了10%以上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Frequency domain analysis of a piezoelectric energy harvester with impedance matching network
Abstract Piezoelectric energy harvesters are electromechanical systems, capable to convert ambient dispersed mechanical vibrations into usable electrical energy. They can be used for supplying power to sensors and actuators that are wireless connected, miniaturized and remote located. In this work, we analyze piezoelectric energy harvesters for mechanical vibrations in the frequency domain. White Gaussian and colored noise models for random vibrations are considered. The governing equations for the harvester are derived from mechanical properties, the characteristic relationships of piezoelectric materials, and circuit description of the electrical load. We show that the energy harvester can be modelled by cascade connected electromechanical two-ports, and that frequency domain methods are the perfect tool for analysis. Formulas for the harvested power and power efficiency are derived. We also show that application of matching networks reduces the impedance mismatch between the mechanical and the electrical parts, significantly increasing the harvested power and power efficiency. The matching network solution is compared to others, previously proposed solutions, such as application of power-factor correction. We show that the matching network offers nine times more average power and better power efficiency than the unmatched resistive load, and increases by more than 10% the harvested power and efficiency, with respect to the power-factor corrected solution.
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来源期刊
Energy Harvesting and Systems
Energy Harvesting and Systems Energy-Energy Engineering and Power Technology
CiteScore
2.00
自引率
0.00%
发文量
31
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