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Design and Analysis of Switching Circuits for Energy Harvesting in Piezostrutures.

机译：压电结构中能量收集的开关电路的设计和分析。

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摘要

This study deals with a general method for the analysis of a semi-active control technique for a fast-shunt switching system. The benefit of the semi-active system is the reduction in power consumption, which is a significant disadvantage of a fully active system compared with a passive system. A semi-active system under consideration is a semi-actively shunted piezoelectric system, which converts the strain energy into electrical energy through strong electromechanical coupling achieved though the piezoelectric phenomenon.;Our proposed semi-active approach combines a PZT-based energy harvesting with a fast switching system driven by a Pulse-Width Modulated (PWM) signal. The fast switching system enables continuous adaptation of vibration energy control/harvesting by varying the PWM duty cycle. This contrasts with a conventional capacitance switching system that can only change the capacitance at discrete values.;The analysis of the current piezoelectric system combined with a fast-switching system poses a considerable challenge as it contains both continuous and discrete characteristics.;The study proposes an enhanced averaging method for analyzing the piecewise linear system. The simulation of the averaged system is much faster than that of the time-varying system. Moreover, the analysis derives error bounds that characterize convergence in the time domain of the averaged system to the original system.;The dissertation begins with the derivation of the equations governing the physics of a piezostructure combined with an electrical switching shunt network. The results of the averaging analysis and numerical simulation are presented in order to provide a basis for estimating the structural responses that range between open- and short-circuit conditions which constitutes two limiting conditions. An experimental study demonstrates that the capacitive shunt bimorph piezostructure coupled with a single switch can be adjusted continuously by varying the PWM duty cycle. And the behavior of such hybrid system can be well predicted by the averaging analysis.
机译：这项研究涉及一种用于快速并联开关系统的半主动控制技术分析的一般方法。半主动系统的好处是降低了功耗，与被动系统相比，这是完全主动系统的一个显着缺点。正在考虑的半主动系统是半主动并联压电系统，该系统通过通过压电现象实现的强机电耦合将应变能转换为电能。我们提出的半主动方法将基于PZT的能量收集与由脉宽调制（PWM）信号驱动的快速切换系统。快速开关系统可通过改变PWM占空比来连续调整振动能量的控制/收集。这与传统的电容开关系统形成对比，后者只能在离散值上改变电容。当前压电系统与快速开关系统的组合分析面临着巨大挑战，因为它既具有连续特性又具有离散特性。一种用于分析分段线性系统的增强平均方法。平均系统的仿真比时变系统的仿真快得多。此外，该分析还得出了误差边界，该误差边界表征了平均系统在时域中与原始系统的收敛性。论文首先推导了控制压电结构与电开关并联网络相结合的物理方程。给出了平均分析和数值模拟的结果，以便为估算构成两个极限条件的开路和短路条件之间的结构响应提供基础。实验研究表明，通过改变PWM占空比，可以连续调节电容并联双压电晶片压电结构与单个开关的耦合。通过平均分析可以很好地预测这种混合系统的行为。

著录项

  • 作者

    Kim, Woon Kyung.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Engineering Mechanical.;Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 128 p.
  • 总页数 128
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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