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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A spiral-shaped harvester with an improved harvesting element and an adaptive storage circuit
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A spiral-shaped harvester with an improved harvesting element and an adaptive storage circuit

机译：具有改进的收割元件和自适应存储电路的螺旋形收割机

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摘要

A piezoelectric energy harvester consists of a spiral-shaped piezoelectric bimorph to transfer mechanical energy into electric energy, an electrochemical battery to store the scavenged electric energy, and a rectifier together with a step-down dc-dc converter to connect the two components as an integrated system. A spiral-shaped harvesting structure is studied in this paper because it is very useful in the microminiaturization of advanced sensing technology. The aim of employing a step-down dc-dc converter in the storage circuit is to match the optimal output voltage of the piezoelectric bimorph with the battery voltage for efficient charging. In order to raise the output power density of a harvesting element, moreover, we apply a synchronized switch harvesting on inductor (SSHI) in parallel with the piezoelectric bimorph to artificially extend the closed-circuit interval of the rectifier. Numerical results show that the introduction of a dc-dc converter in the storage circuit or a SSHI in the harvesting structure can raise the charging efficiency several times higher than a harvester without a dc-dc converter or an SSHI
机译：压电能量收集器由螺旋形压电双压电晶片（将机械能转化为电能），电化学电池（存储清除后的电能），整流器以及降压DC-DC转换器（将两个组件连接为一个）组成。集成系统。本文研究了一种螺旋状的收获结构，因为它在先进传感技术的微型化中非常有用。在存储电路中采用降压DC-DC转换器的目的是使压电双压电晶片的最佳输出电压与电池电压相匹配，以实现高效充电。此外，为了提高收集元件的输出功率密度，我们将同步开关收集在电感器（SSHI）上与压电双压电晶片并联，以人为地延长整流器的闭路间隔。数值结果表明，在存储电路中引入DC-DC转换器或在采集结构中引入SSHI可以使充电效率比没有DC-DC转换器或SSHI的采集器提高几倍。

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