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首页> 外文期刊>Journal of Low Power Electronics >Dielectric Losses Considerations for Piezoelectric Energy Harvesting
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Dielectric Losses Considerations for Piezoelectric Energy Harvesting

机译：压电能量收集的介电损耗考虑因素

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During the last decades, vibrations-based piezoelectric energy scavenging has been widely investigated as a way to replace or complement batteries to power sensor nodes in closed and confined environments. Piezoelectric ceramics exhibit conductive and dielectric losses. However, inmost models used in energy harvesting, these losses are disregarded, as they appear to be relatively small in manufacturer datasheets. In this paper, after briefly introducing the origins of those losses, we experimentally prove that they are strongly dependent on the electric field in thematerial. This means that the datasheets data, obtained under low electric field characterizations, are not representative of the actual material losses under real-world vibrations. Thereafter, we prove that these losses limit the harvesting energy bandwidth, and we deduce the theoreticalperformance boundaries of piezoelectric harvesters. Finally, we study how harvesting energy on a linear resistive load is impacted by the losses in the piezoelectric material. Experimental results are in good agreement with our analysis and show that these losses should be taken into accountin the electromechanical models in order to accurately predict the harvestable power from a linear piezoelectric harvester.
机译：在过去十年中，基于振动的压电能量清除已经被广泛调查作为替换或补充电池在闭合和限制环境中的电力传感器节点的方式。压电陶瓷表现出导电和介电损耗。然而，在能量收集中使用的最重要的模型，这些损失被忽略了，因为它们在制造商数据表中似乎相对较小。本文简要介绍了这些损失的起源，我们实验证明它们强烈依赖于整体中的电场。这意味着在低电场特征下获得的数据表数据并不代表现实世界振动下的实际材料损失。此后，我们证明了这些损失限制了收获能量带宽，我们推测了压电收割机的理论绩效界限。最后，我们研究如何在线性电阻载荷的收获能量受压电材料中的损耗的影响。实验结果与我们的分析吻合良好，并表明这些损失应考虑到机电模型，以便准确地预测来自线性压电收割机的收获功率。

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