共查询到18条相似文献,搜索用时 171 毫秒
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为了收集并利用汽车通过公路时所产生的振动能量,设计了一种利用压电材料的正压电效应采集环境振动能量,把振动能转换成电能的道路用振动发电装置。为使压电材料和道路振动能巧妙结合从而吸收最大的外部能量,获得高的发电效率,进行了以下研究:分析了压电材料变形量对发电能力的影响,并设计了能找到压电材料产生最大电能的最小变形量的模型。通过实验分析压电片的联接方式对电能输出的影响,得到了以并联为主,串联为辅的混联电路模型。设计并制作了道路用压电发电装置模型,通过模拟实验测得其发电功率为0.061 2 W,电容储电功率为0.026 4 W,发电效率为14.42%,电容储电效率6.21%。 相似文献
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压电材料可将机械振动能转换为电能,但其产生的电能较小且具有交流特性,有必要建立储能电路将压电振动产生的电能储存起来并输出稳定的直流电。根据压电构造方程,建立压电振动能量收集系统的耦合场数学模型,对输出电压和最大输出功率进行数值模拟。设计与制作了一种以电容为储能介质的储能电路,通过电压比较器和电压调节器来保证稳定的直流输出。实验结果表明该储能电路能提供稳定的2.24V的直流输出电压,储能效率最高可达66.3%,并分析其能耗及误差产生的原因。 相似文献
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能量收集系统是从环境中获得能量的系统。不幸的是,这类发电装置提供的能量要比标准的电池少得多。然而,随着当今可佩戴设备尺寸和功耗的降低,在一些低功耗系统中,用能够从用户所处环境收集能量(如用户行走和跑动中产生的振动能)的发电装置替代电池已具有可行性。此设计实例利用标准和易于获得的压电蜂音器的压电效应将机械振动转化为电能。尽管压电蜂音器通常是在施加交流电后发出声波,但也可以反过来利用它,也就是说,在振动频率与压电蜂音器共振频率匹配时,压电蜂音器可以产生最大的交流峰值电压供人使用。 相似文献
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MEMS自供能压电电磁集成发电研究现状 总被引:1,自引:0,他引:1
压电电磁集成发电是指利用功能材料的压电效应和法拉第电磁感应定律设计压电和电磁两种能量转换方式的集成结构,实现环境振动机械能向电能转换。描述了压电电磁集成微能源技术的原理和特点,介绍了压电电磁集成发电理论建模过程,分析了国内外关于集成微电源结构的设计及优化,概况了各种压电电磁集成发电结构的特点。介绍了各种集成结构的集成化加工技术,包括压电梁制作、感应线圈制作和压电电磁系统集成。最后对压电电磁集成发电存在的技术问题进行了分析,新型集成自供能微能源研究将提高能量收集效率并实现与无线传感节点集成供能。 相似文献
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Fabrication and performance of MEMS-based piezoelectric power generator for vibration energy harvesting 总被引:4,自引:0,他引:4
Hua-Bin Fang Jing-Quan Liu Zheng-Yi Xu Li Wang Bing-Chu Cai 《Microelectronics Journal》2006,37(11):1280-1284
A MEMS-based energy harvesting device, micro piezoelectric power generator, is designed to convert ambient vibration energy to electrical power via piezoelectric effect. In this work, the generator structure of composite cantilever with nickel metal mass is devised. Micro-electronic-mechanical systems (MEMS) related techniques such as sol-gel, RIE dry etching, wet chemical etching, UV-LIGA are developed to fabricate the device and then its performance is measured on vibration testing setup. The investigation shows that the designed device is expected to resonantly operate in low-frequency environmental vibration through tailoring the structure dimension. Under the resonant operation with frequency of about 608 Hz, a first prototype of the generator result in about 0.89 V AC peak-peak voltage output to overcome germanium diode rectifier toward energy storage, and its power output is in microwatt level of 2.16 μW. 相似文献
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《Mechatronics》2019
With the advent of low power VLSI designs and the mass manufacture of CMOS, the power consumption of wireless sensor nodes has been significantly reduced from mW to μW. This opens up a new and interesting research field, that is, the possibility of converting environmental vibration energy to electrical energy for supplying power to the sensors. In this paper, using magnetostrictive materials slice, that is Fe-Ga alloy, a device for harvesting environmental vibration energy is designed and tested. Compared with piezoelectric materials and Terfenal-D alloy, Fe-Ga alloy offers excellent properties for surviving in tough ambient vibration conditions, including higher energy conversion efficiency, longer life cycles, excellent toughness, reduced depolarization and higher flexibility, etc. The designing of vibration energy harvesting process is based on the coupling characteristics of magnetostrictive inverse effect and Faraday electromagnetic induction. The device consists of a Fe-Ga alloy cantilever beam with a magnetostrictive direction throughout the length. It has magnetostrictive inverse effect during vibration and the internal magnetization state will change. A cantilever beam is surrounded by a pickup coil and voltage is induced due to the magnetic field according to Faraday's law. The energy conversion principle among mechanical, magnetic and electric energy is described through a dynamic equation of motion and in conjunction with an electromagnetic conversion equation. The influence law of bias and excitation conditions on output voltage, power and other characteristics of device are investigated in comprehensive experiments. By knowing these influence laws, it is possible to choose an appropriate number of pick up coil for a definite load resistance, to set an appropriate working frequency range, pre-tightening force and pre-magnetized magnetic field such that a maximum power can be harvested. The results derived here can be used as a design guideline for future studies in optimal design and the modeling of vibration energy harvester and force sensor. 相似文献
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Jing-Quan Liu Hua-Bin Fang Zheng-Yi Xu Xin-Hui Mao Xiu-Cheng Shen Di Chen Hang Liao Bing-Chu Cai 《Microelectronics Journal》2008,39(5):802-806
Piezoelectric power generator made by microelectromechanical system (MEMS) technology can scavenge power from low-level ambient vibration sources. The developed MEMS power generators are featured with fixed/narrow operation frequency and power output in microwatt level, whereas, the frequency of ambient vibration is floating in some range, and power output is insufficient. In this paper, a power generator array based on thick-film piezoelectric cantilevers is investigated to improve frequency flexibility and power output. Piezoelectric cantilevers array has been designed and fabricated. The cantilevers array can be tuned to the frequency and expanded the excited frequency bandwidth in ambient low frequency vibration. Serial connection among cantilevers of the array is investigated. The prototype generator has a measured performance of 3.98 μW effective electrical power and 3.93 DC output voltage to resistance load. This device is promising to support networks of ultra-low-power, peer-to-peer, wireless nodes. 相似文献
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针对目前单一化的压电式或电磁式机械振动能量采集装置最大输出功率较低的问题,设计了一种新型的压电电磁复合式能量采集器。通过对复合式能量采集器建立数学模型,推导出了电压、电流及输出功率的表达式。然后对复合式能量采集器的输出功率特性进行数值仿真,并设置压电片内阻值及其他参数条件,对比分析复合式能量采集器模型与单一的压电式或电磁式能量采集器模型,理论上输出功率提高了38.2%和4.74%。最后通过对采用悬臂梁结构的振动能量采集器的具体实验数据进行分析,论证了压电电磁复合式能量采集器输出功率的高效性。 相似文献
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