层叠式三片串联压电俘能器的设计与实验

Design and Experiment of Cascade Three Piece Piezoelectric Energy Harvester in Series

针对液压系统中低功耗电子元件使用电池供电时,存在续航短、更换困难等弊端,提出了一种收集压力脉动能量的层叠式三片串联压电俘能器。针对该压电俘能器,实验分析了静态压力、脉动频率、负载电阻等参数对俘能特性的影响。结果表明,频率与静态压力相同时,输出电压会随着负载电阻的增加而增大,最终趋于平缓,而且输出电压在电阻相同时会随着频率的增加而增大,频率为100 Hz,压力为3 MPa时,800 kΩ处输出电压最高可达9.52 V;输出功率先增大后减小,即存在最佳电阻使输出功率达到最大,且不同频率下使俘能器达到最大输出功率的负载电阻不同,频率为100 Hz,压力为3 MPa时,100 kΩ处输出的平均功率最大可达368.45μW。

A stacked three piece series piezoelectric energy harvester for collecting pressure pulsation energy is proposed to address the drawbacks of short battery life and difficult replacement when low-power electronic components in hydraulic systems are powered by batteries.This effectively solves the aforementioned drawbacks.For this piezoelectric energy harvester,the effects of parameters such as static pressure,pulsation frequency,and load resistance on the energy harvesting characteristics were experimentally analyzed.The results show that when the frequency is the same as the static pressure,the output voltage will increase with the increase of the load resistance and eventually tend to be flat.Moreover,the output voltage will increase with the increase of frequency when the resistance is the same.At a frequency of 100 Hz and a pressure of 3 MPa,the maximum output voltage at 800 kΩcan reach 9.52 V;The output power first increases and then decreases,that is,there is an optimal resistance to achieve the maximum output power,and the load resistance to achieve the maximum output power of the energy harvester varies at different frequencies.At a frequency of 100 Hz and a pressure of 3 MPa,the maximum average output power at 100 kΩcan reach 368.45μW.