We demonstrate a piezoelectric vibration energy harvester with the ZnO piezoelectric film and an improved synchronous electric charge extraction energy harvesting circuit on the basis of the beam-type mechanical struc...We demonstrate a piezoelectric vibration energy harvester with the ZnO piezoelectric film and an improved synchronous electric charge extraction energy harvesting circuit on the basis of the beam-type mechanical structure,especially investigate its output performance in vibration harvesting and ability to generate charges.By establishing the theoretical model for each of vibration and circuit,the numerical results of voltage and power output are obtained.By fabricating the prototype of this harvester,the quality of the sputtered film is explored.Theoretical and experimental analyses are conducted in open-circuit and closed-circuit conditions,where the open-circuit mode refers to the voltage output in relation to the ZnO film and external excitation,and the power output of the closed-circuit mode is relevant to resistance.Experimental findings show good agreement with the theoretical ones,in the output tendency.It is observed that the properties of ZnO film achieve regularly direct proportion to output performance under different excitations.Furthermore,a maximum experimental power output of 4.5 mW in a resistance range of 3 kΩ-8 kΩis achieved by using an improved synchronous electric charge extraction circuit.The result is not only more than three times the power output of classic circuit,but also can broaden the resistance to a large range of 5 kΩunder an identical maximum value of power output.In this study we demonstrate the fundamental mechanism of piezoelectric materials under multiple conditions and take an example to show the methods of fabricating and testing the ZnO film.Furthermore,it may contribute to a novel energy harvesting circuit with high output performance.展开更多
本文提出了一种基于同步电荷提取的高效多压电能俘获电路(High Efficiency Multi-piezoelectric Energy Harvesting Circuit Based on Synchronous Electric Charge Extraction,EM-SECE).所提出的电路利用改进的正负峰值检测结构,减小...本文提出了一种基于同步电荷提取的高效多压电能俘获电路(High Efficiency Multi-piezoelectric Energy Harvesting Circuit Based on Synchronous Electric Charge Extraction,EM-SECE).所提出的电路利用改进的正负峰值检测结构,减小了压电元件(Piezoelectric Transducer,PZT)达到电压峰值处和开关动作之间的相位差,从而提高了单个压电元件的能量收集效率.并且利用单电感的时分复用,实现基于单电感的多个压电元件振动能俘获.所提出电路具有无整流桥结构,且可以实现自供电的特点.实验结果表明,相同实验条件下,单压电EM-SECE电路的俘获功率为标准能量俘获电路(SEH)最大功率的3.09倍;在仅用一个电感的情况下,双压电EM-SECE电路的俘获功率为两个单压电EMSECE电路之和的97%.展开更多
文摘We demonstrate a piezoelectric vibration energy harvester with the ZnO piezoelectric film and an improved synchronous electric charge extraction energy harvesting circuit on the basis of the beam-type mechanical structure,especially investigate its output performance in vibration harvesting and ability to generate charges.By establishing the theoretical model for each of vibration and circuit,the numerical results of voltage and power output are obtained.By fabricating the prototype of this harvester,the quality of the sputtered film is explored.Theoretical and experimental analyses are conducted in open-circuit and closed-circuit conditions,where the open-circuit mode refers to the voltage output in relation to the ZnO film and external excitation,and the power output of the closed-circuit mode is relevant to resistance.Experimental findings show good agreement with the theoretical ones,in the output tendency.It is observed that the properties of ZnO film achieve regularly direct proportion to output performance under different excitations.Furthermore,a maximum experimental power output of 4.5 mW in a resistance range of 3 kΩ-8 kΩis achieved by using an improved synchronous electric charge extraction circuit.The result is not only more than three times the power output of classic circuit,but also can broaden the resistance to a large range of 5 kΩunder an identical maximum value of power output.In this study we demonstrate the fundamental mechanism of piezoelectric materials under multiple conditions and take an example to show the methods of fabricating and testing the ZnO film.Furthermore,it may contribute to a novel energy harvesting circuit with high output performance.
文摘本文提出了一种基于同步电荷提取的高效多压电能俘获电路(High Efficiency Multi-piezoelectric Energy Harvesting Circuit Based on Synchronous Electric Charge Extraction,EM-SECE).所提出的电路利用改进的正负峰值检测结构,减小了压电元件(Piezoelectric Transducer,PZT)达到电压峰值处和开关动作之间的相位差,从而提高了单个压电元件的能量收集效率.并且利用单电感的时分复用,实现基于单电感的多个压电元件振动能俘获.所提出电路具有无整流桥结构,且可以实现自供电的特点.实验结果表明,相同实验条件下,单压电EM-SECE电路的俘获功率为标准能量俘获电路(SEH)最大功率的3.09倍;在仅用一个电感的情况下,双压电EM-SECE电路的俘获功率为两个单压电EMSECE电路之和的97%.
