弱振动环境中的压电俘能器  

Piezoelectric energy harvester under weak vibration environment

作　　者：薛欢[1] 胡元太[1] 胡洪平[1] 高发荣[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2008年第3期54-57,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：研究了一种能从弱振动环境中有效俘能并储能的压电俘能器,分析了该器件将机械能转化成交流电和直流电并最终储存到化学电池的全过程.利用能量平衡条件,确定了直流升压变换器的占空比与俘能结构的输出整流电压之间的关系,该关系式使得人们可以通过调节电路参数占空比来改善俘能结构的性能,以保证在环境振动变化时,俘能端也能随之调节到最优工作状态.计算表明:有直流升压变换器的压电俘能器充电效率比没有时的充电效率要提高好几倍.An improved piezoelectric power harvester lever vibration source, is studied in this paper. The , which can effectively scavenge energy from low energy transmitting process is clearly discussed. Using the condition that the energy flow out of the harvester structure should be equal to the one flow into the battery, we get the relationship between the duty cycle and the rectified voltage. By adjusting the duty cycle, the boost dc-dc converter plays a role in matching the optimal rectified voltage V with the battery voltage Vb. The charging efficiencies with and without a boost dc-dc converter are compared with each other and it is found that the application of a boost dc-dc converter will greatly raise the charging efficiency of a harvester under vibrations with smaller amplitudes.

关 键 词：压电俘能器 弱振源 直流升压变换器 占空比 充电效率 

分 类 号：TM282[一般工业技术—材料科学与工程]