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1.
Advances in energy harvesting using low profile piezoelectric transducers   总被引:6,自引:0,他引:6  
The vast reduction in the size and power consumption of sensors and CMOS circuitry has led to a focused research effort on the on-board power sources which can replace the batteries. The concern with batteries has been that they must always be charged before use. Similarly, the sensors and data acquisition components in distributed networks require centralized energy sources for their operation. In some applications such as sensors for structural health monitoring in remote locations, geographically inaccessible temperature or humidity sensors, the battery charging or replacement operations can be tedious and expensive. Logically, the emphasis in such cases has been on developing the on-site generators that can transform any available form of energy at the location into electrical energy. Piezoelectric energy harvesting has emerged as one of the prime methods for transforming mechanical energy into electric energy. This review article provides a comprehensive coverage of the recent developments in the area of piezoelectric energy harvesting using low profile transducers and provides the results for various energy harvesting prototype devices. A brief discussion is also presented on the selection of the piezoelectric materials for on and off resonance applications. Analytical models reported in literature to describe the efficiency and power magnitude of the energy harvesting process are analyzed.
Shashank PriyaEmail:
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2.
Piezoelectric Energy Harvesting under High Pre-Stressed Cyclic Vibrations   总被引:5,自引:0,他引:5  
Cymbal transducers have been found as a promising structure for piezoelectric energy harvesting under high force (∼ 100 N) at cyclic conditions (∼ 100–200 Hz). The thicker steel cap enhances the endurance of the ceramic to sustain higher ac loads along with stress amplification. This study reports the performance of the cymbal transducer under ac force of 70 N with a pre-stress load of 67 N at 100 Hz frequency. At this frequency and force level, 52 mW power was generated from a cymbal measured across a 400 kΩ resistor. The ceramic diameter was fixed at 29 mm and various thicknesses were experimented to optimize the performance. The results showed that the PZT ceramic of 1 mm thickness provided the highest power output with 0.4 mm endcap. In order to accommodate such high dynamic pressure the transducer and cap materials were modified and it was found that the higher piezoelectric voltage constant ceramic provided the higher output power. Electrical output power as a function of applied ac stress magnitude was also computed using FEM analysis and the results were found to be functionally coherent with experiment. This study clearly demonstrated the feasibility of using piezoelectric transducers for harvesting energy from high magnitude vibration sources such as automobile.  相似文献
3.
激励环境下悬臂梁式压电振动发电机性能分析   总被引:4,自引:0,他引:4  
为了提高有限体积内压电振动发电机的发电能力,针对外力和位移激励环境,通过数学模型及ANSYS仿真分析了单、双晶压电发电机结构参数与输出电压及谐振频率之间的关系并进行了实验验证。研究结果表明,在外力激励环境下,应尽量增加压电梁的长度,减小宽度;在位移激励环境下,应尽量降低压电梁的长度。同时,在两种激励环境中,均应优先选用小厚度比的双晶压电梁。  相似文献
4.
一种远程无线环境监测模拟装置设计   总被引:2,自引:1,他引:1  
针对无人值守远程环境监测问题,设计了一个实验模拟系统。系统采用模块化设计,主要由能量收集模块、监控中心模块、传感器监测节点模块、无线传输模块和液晶显示模块等组成。监控中心和监测节点采用AVRAtmega16L单片机作为控制核心,监测节点的环境监测信号编码后通过幅度调制由无线收发模块发送至监控中心。环境监测节点由能量收集模块供电,无需更换电池。该系统功耗低,节点配置灵活,结构简单,可以实现温度、湿度和光照强度的监测、无线传输以及数字化显示。  相似文献
5.
Energy harvesting using piezoelectric materials: Case of random vibrations   总被引:1,自引:0,他引:1  
A dramatic consumption reduction of integrated circuits related to the development of mobile electronic devices has been reached over the past years, enabling the use of ambient energy instead of batteries. The focus is here on the transformation of ambient mechanical vibrations into electrical energy. This paper compares the performances of a vibration-powered electrical generator using PZT piezoelectric ceramics associated to two different power conditioning circuits. A new approach of the piezoelectric power conversion based on a nonlinear voltage processing is presented and implemented using a particular circuit. Theoretical predictions and experimental results show that the new technique may increase the power harvested by a factor up to 4 compared to the Standard technique. The power optimization problem is in particular examined in the case of broadband, random vibrations.  相似文献
6.
自供电同步开关电感阻尼电路功率特性分析   总被引:1,自引:1,他引:0       下载免费PDF全文
为了明确自供电式同步开关电感阻尼电路的功率特性,同时为优化开关控制电路提供理论依据,分析了该电路的阻抗特点及其输出功率随负载的变化关系,并研究了在不同激振强度下能量收集的效率。实验测试了压电悬臂梁尖端振幅为2mm及4mm时负载电路获得功率及悬臂梁振子输出的总功率。结果表明,在振幅为2mm时,负载获得的最大输出功率为38.6μW;在振幅为4mm时,最大功率187μW。在压电振子正常工作的振动强度范围内,激振强度越大,自供电式同步开关电感阻尼电路的能量收集效率越高。在200~800kΩ负载范围内,振幅为4mm时的效率比2mm时高10%左右。  相似文献
7.
Piezoelectric actuators 2006   总被引:1,自引:0,他引:1  
Piezoelectric actuators have been commercialized in various areas such as information technology, robotics, bio-, medical engineering, ecological and energy engineering. This paper reviews their recent application developments and foresees the future of piezoelectric actuators.  相似文献
8.
基于五级电荷泵能量收集的电流互感器取能电源   总被引:1,自引:0,他引:1       下载免费PDF全文
针对现有电流互感器取能电源存在供电死区的现象,提出了一种可适应较小电流电力母线的电流互感器取能电源供电方案。在分析电源取能原理的基础上,建立了电流互感器取能电源的电路模型,并推导了电源取得最大功率的条件。选择高饱和磁感应强度的硅钢材料作为铁芯,设计了五级电荷泵电路、能量收集电路以及电源管理电路。基于所提出的方案研制了样机,以无线测温模块作为负载,对样机整体进行了测试。实验结果表明,当电流在1~1 000A范围内时,电源工作于非饱和低热耗状态。  相似文献
9.
随着大规模集成电路、无线传感网络的发展和对微机电技术研究的逐渐深入,基于微机电系统(MEMS)技术的微型电源具有广阔的应用前景。作为微型电源的一个分支,微型电磁式振动能量采集器可将环境中普遍存在的振动能转换为电能,从而可以长期有效的为传感器件供电。简单介绍了电磁式振动能量采集器的物理模型和工作原理,研究了在正弦激励下采集器的振动特性,分析了采集器结构的固有频率与振动形式,并利用有限元法对结构进行优化,提出了一种复合式振动能量采集器结构并进行了仿真研究,该结构与传统单一永磁体结构相比,输出电压显著提高。  相似文献
10.
为保证变电站高压母线供电安全,设计了自供电的高压母线无线温度监测系统,由温度传感器采集温度, Zigbee模块传输数据,实现温度无线监测,供电方式采用基于TI公司的bq25504能量采集芯片采集太阳能为无线测温模块供电,保证系统长期正常工作,从而解决了无线温度监测方式电池供电周期短的问题。  相似文献
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