An optimized self-powered switching circuit for non-linear energy harvesting with low voltage output
An optimized self-powered switching circuit for non-linear energy harvesting with low voltage output
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DOI：
10.1088/0964-1726/17/3/035030
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发表时间：
2008-06-01
影响因子：
4.1
通讯作者：
Guyomar, Daniel
中科院分区：
文献类型：
--
作者：
Lallart, Mickael;Guyomar, Daniel
最近几年，从环境资源中收集能量一直受到特别关注。可以为电子系统供电的微型发电机是自主无线设备概念的解决方案。它们可以去除笨重和昂贵的布线，以及电池供电系统的复杂维护和环境问题。特别地，使用压电发电机将振动能转换成电能是一个深入研究的领域。在该领域中，已经表明，通过使用称为SSHI（感应器上的同步开关收获）的压电电压的原始非线性处理，可以大大提高收获的能量，该处理包括在非常短的时间内间歇地切换谐振电网络上的压电元件。然而，具有低电压输出的小型化微型发电机的集成（例如，G. MEMS微型发电机）尚未得到广泛研究。在低电压输出的情况下，二极管或晶体管等分立元件的电压间隙引入的损耗不再可以忽略。因此，本文的目的是提出一个模型，考虑到这种损失，以及一个新的架构的SSHI能量收集电路，限制这种损失在收集过程中。虽然大多数研究使用外部供电的微控制器进行非线性治疗，但该电路完全自供电，从而提供了增强的自主微型发电机。特别地，该电路旨在限制具有电压间隙的非线性部件（诸如二极管）的影响。理论和实验表明，使用这样的电路可以显着增加收获的功率。特别是，在悬臂梁上进行的实验测量表明，与标准能量收集电路相比，该电路允许收集功率增加160%，而SSHI的经典实现显示出在经典情况下仅增加100%的输出功率。
Harvesting energy from environmental sources has been of particular interest these last few years. Microgenerators that can power electronic systems are a solution for the conception of autonomous, wireless devices. They allow the removal of bulky and costly wiring, as well as complex maintenance and environmental issues for battery-powered systems. In particular, using piezoelectric generators for converting vibrational energy to electrical energy is an intensively investigated field. In this domain, it has been shown that the harvested energy can be greatly improved by the use of an original non-linear treatment of the piezoelectric voltage called SSHI ( Synchronized Switch Harvesting on Inductor), which consists in intermittently switching the piezoelectric element on a resonant electrical network for a very short time. However, the integration of miniaturized microgenerators with low voltage output ( e. g. MEMS microgenerators) has not been widely studied. In the case of low voltage output, the losses introduced by voltage gaps of discrete components such as diodes or transistors can no longer be neglected. Therefore the purpose of this paper is to propose a model that takes into account such losses as well as a new architecture for the SSHI energy harvesting circuit that limits such losses in the harvesting process. While most of the study uses an externally powered microcontroller for the non-linear treatment, this circuit is fully self-powered, thus providing an enhanced autonomous microgenerator. In particular this circuit aims at limiting the effect of non-linear components with a voltage gap such as diodes. It is shown both theoretically and experimentally that the harvested power can be significantly increased using such a circuit. In particular, experimental measurements performed on a cantilever beam show that the circuit allows a 160% increase of the harvested power compared to a standard energy harvesting circuit, while the classical implementation of the SSHI shows an increase of only 100% of the output power in the classical case.