压电振动能量采集器的性能分析与功率优化  

Performance analysis and power optimization of piezoelectric vibration energy harvester

作　　者：展永政[1] 王光庆[1] 

机构地区：[1]浙江工商大学信息与电子工程学院,浙江杭州310018

出　　处：《浙江大学学报（工学版）》2014年第7期1248-1253,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51277165);浙江省自然科学基金资助项目(Y1080037);浙江省教育厅资助项目(Y201223050);浙江省高校优秀青年教师资助项目;浙江工商大学青年人才基金资助项目

摘　　要：为了预测压电振动能量采集器的输出特性,优化输出功率,以压电双晶片串联型振动能量采集器为研究对象,综合考虑结构与电路耦合因素,利用有限元法和ANSYS软件建立压电振动能量采集器的有限元机电耦合动力学模型和网格实体模型.分析在外力激振条件下负载电阻对压电振动能量采集器的振动特性和电输出特性的影响,得到不同负载电阻下压电能量采集器的振动特性和电输出特性曲线.通过调节负载电阻使之与能量采集器的阻抗匹配,实现了对能量采集器输出功率的优化,得到了优化的负载电阻和输出功率.研究结果表明,采用压电能量采集器能够输出大的开路电压、大的短路电流,优化后的开路和短路谐振时的最大输出功率分别达到57.81和55.12W.Bimorph piezoelectric layers in series connection were analyzed in order to predict the output performances and optimize the output power of the piezoelectric vibration energy harvester（PVEH）.A finite element electromechanical coupled dynamic model and a solid lattice model（SLM）of the bimorph cantilevered PVEH were derived with ANSYS software and the finite element method,considering the coupling factor between the mechanical structure and the circuit.The effects of the different load resistances on the vibration performance and the electrical output performance of PVEH under the excitation of the external force were analyzed.Then the curves of its vibration performance and electrical output performance with different load resistances were obtained.The impedance of energy harvester was matched with it by adjusting the load resistance,which realized the output power optimization of energy harvester.The optimal load resistance and the output power were received.Results showed that the PVEH had a large output voltage under open-circuit condition and a large current under short-circuit condition.The maximal output power under open-circuit and short-circuit conditions reached 57.81and 55.12W,respectively.

关 键 词：压电双晶片悬臂梁 有限元模型(FEM) 振动能量采集器 最优负载电阻 功率优化 

分 类 号：TN712[电子电信—电路与系统] TN751