Optimized energy harvesting from mechanical vibrations through piezoelectric actuators, based on a synchronized switching technique

被引:0
作者
Tsampas, P. [1 ]
Roditis, G. [1 ]
Papadimitriou, V. [1 ]
Chatzakos, P. [1 ]
Gan, Tat-Hean [2 ]
机构
[1] Innora SA Innovat Robot Automat, 59 Ioanni Metaxa Str, Koropi 19400, Greece
[2] TWI Technol Ctr Ltd, Cambridge CB216AL, England
来源
SMART SENSORS, ACTUATORS, AND MEMS VI | 2013年 / 8763卷
关键词
Energy Harvesting; Synchronized Switching; Piezoelectric actuators;
D O I
10.1117/12.2017255
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Increasing demand in mobile, autonomous devices has made energy harvesting a particular point of interest. Systems that can be powered up by a few hundreds of microwatts could feature their own energy extraction module. Energy can be harvested from the environment close to the device. Particularly, the ambient mechanical vibrations conversion via piezoelectric transducers is one of the most investigated fields for energy harvesting. A technique for optimized energy harvesting using piezoelectric actuators called "Synchronized Switching Harvesting" is explored. Comparing to a typical full bridge rectifier, the proposed harvesting technique can highly improve harvesting efficiency, even in a significantly extended frequency window around the piezoelectric actuator's resonance. In this paper, the concept of design, theoretical analysis, modeling, implementation and experimental results using CEDRAT's APA 400M-MD piezoelectric actuator are presented in detail. Moreover, we suggest design guidelines for optimum selection of the storage unit in direct relation to the characteristics of the random vibrations. From a practical aspect, the harvesting unit is based on dedicated electronics that continuously sense the charge level of the actuator's piezoelectric element. When the charge is sensed, to come to a maximum, it is directed to speedily flow into a storage unit. Special care is taken so that electronics operate at low voltages consuming a very small amount of the energy stored. The final prototype developed includes the harvesting circuit implemented with miniaturized, low cost and low consumption electronics and a storage unit consisting of a super capacitors array, forming a truly self-powered system drawing energy from ambient random vibrations of a wide range of characteristics.
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页数:11
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