Piezoelectric energy enhancement strategy for active fuzzy harvester with time-varying and intermittent switching
Piezoelectric energy enhancement strategy for active fuzzy harvester with time-varying and intermittent switching
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DOI：
10.1088/1361-665x/abca08
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发表时间：
2021-01-01
影响因子：
4.1
通讯作者：
Makihara, Kanjuro
中科院分区：
文献类型：
--
作者：
Hara, Yushin;Zhou, Meng;Makihara, Kanjuro
本研究的目的是增加从压电振动能量采集器在空载和高负载电阻条件下收集的电能的量。虽然由于同步开关感应器上的收获（SSHI）策略而增加的压电电荷抑制了机械振动，但是对于关于具有SSHI策略的主动收获器的大多数讨论，收获器中的机械元件的机械振动幅度被假定为恒定的。然而，在过度切换动作下，这种假设是无效的，在这种情况下，采集器的性能恶化。这个问题被称为振动抑制效应。为了解决这个问题，在这项研究中，两个开关策略的电荷反转电路，即开关考虑振动抑制阈值（SCVS-t）和自适应SCVS-t（ASCVS-t），提出了通过间歇性的开关动作。在收获过程中，使用这些策略的间歇切换是基于输出电压阈值执行的，从而通过避免过度切换来保持高的机械振动幅度和优异的收获性能。ASCVS-t采用时变阈值整定算法，无需预整定即可在各种振动条件下实现适当的间歇切换和有效的收获。与传统策略的实验比较证实，所提出的策略实现2.9倍和2.0倍以上的收获能量存储比标准的收割机和传统的开关策略，分别。
This study aims to increase the amount of electrical energy harvested from a piezoelectric vibration energy harvester under unloaded and high-load resistance conditions. Although increased piezoelectric charge due to the synchronized switch harvesting on inductor (SSHI) strategy damps mechanical vibrations, the mechanical vibration amplitude of a mechanical element in a harvester is assumed to be constant for most discussions regarding the active harvester with SSHI strategy. However, this assumption is not valid under excessive switching actions, in which case the performance of the harvester deteriorates. This problem is known as the vibration suppression effect. To address this problem, in this study, two switching strategies for the charge inversion circuit-namely, switching considering vibration suppression-threshold (SCVS-t) and adaptive SCVS-t (ASCVS-t)-are proposed through intermittent switching actions. During the harvesting process, intermittent switching using these strategies is performed based on the output voltage threshold, thus maintaining high mechanical vibration amplitude and excellent harvesting performance by avoiding excess switching. The ASCVS-t adopts a tuning algorithm for the time-varying threshold and can achieve appropriate intermittent switching and effective harvesting under various vibration conditions without pre-tuning. Experimental comparisons with conventional strategies confirm that the proposed strategies achieve 2.9 times and 2.0 times greater harvested energy storages than a standard harvester and conventional switching strategy, respectively.