Energy harvesting from a hybrid piezo-dielectric vibration energy harvester with a self-priming circuit

能量收集 振动 电介质 电容器 材料科学 振幅 功率(物理) 声学 发电机(电路理论) 电压 介电弹性体 电气工程 工程类 物理 光电子学 光学 量子力学
作者
Zhihui Lai,Junchen Xu,Shitong Fang,Zijian Qiao,Suo Wang,Chen Wang,Zhangjun Huang,Shengxi Zhou
出处
期刊:Energy [Elsevier BV]
卷期号:273: 127205-127205 被引量:5
标识
DOI:10.1016/j.energy.2023.127205
摘要

A hybrid piezo-dielectric vibration energy harvester (PDVEH) with a self-priming circuit (SPC) is proposed and explored in this paper for passive vibration energy harvesting without an external power supply. The PDVEH consists of a piezoelectric generator (PEG) and a self-priming dielectric elastomer generator (SP-DEG). The PEG can generate electricity from its attached piezoelectric patch. The SP-DEG combines a vibro-impact DEG (VI DEG) with an improved SPC, which can gain initial charges from the PEG. The SPC then enables the DEG to charge itself using the power generated from the intermittent impacts between the inner sphere and the dielectric elastomer membranes. Hence, passive vibration energy harvesting can be realized through the PDVEH. The operation principles of both the PEG and the SP-DEG are analyzed theoretically, and the corresponding governing equations are derived. The key parameters of the PEG are identified from experimental work, and its dynamic and electrical models are verified. The passive energy harvesting process of the SP-DEG charged by PEG is verified through circuit simulations. Numerical simulations are further conducted to reveal the dynamical and electrical behaviors of the PDVEH under external excitations. It is found that the PDVEH can harvest vibration energy effectively in a low-frequency range (0–7 Hz), and its energy harvesting performance is significantly affected by the amplitude and frequency of the excitation. The maximum output power of 0.12 mW can be achieved through the PDVEH in simulations under a vibration excitation with amplitude 1.0g and frequency 6.6 Hz, showing a potential way to realize DEG-based passive vibration energy harvesting.
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