Adaptive damping tuning and circuit implementation for broad bandwidth energy harvesting

Yamini Sharma, Mingyi Liu, Hyunjun Jung, Lei Zuo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper presents a circuit to tune the electrical damping for optimal power harvesting at time varying excitation frequencies. Optimization of parameters, such as electrical damping to match the mechanical damping and the resonant frequency to match the excitation frequency have long been known. However, the electrical damping optimized at the resonant frequency is not necessarily the optimum point when the excitation frequency changes. This result is especially important in vibration energy harvesting systems since the vibration source is generally not at a single fixed frequency. The proposed circuit detects the excitation frequency and tunes the electrical damping based on a function, obtained from mechanical system modeling and simulation. A frequency detection circuit and a boost converter operating in critical conduction mode are used. Both modeling and experiment results show that the impedance tuning circuit provides the required optimal damping at different excitation frequencies and achieves a much broader bandwidth compared with the conventional system. When the excitation frequency increases to 1.1-1.4 times the natural frequency, the proposed adaptive damping tuning increases the power output by 30%-100% compared to the traditional one.

Original languageEnglish
Article number115049
JournalSmart Materials and Structures
Volume29
Issue number11
DOIs
StatePublished - Oct 2020
Externally publishedYes

Keywords

  • broad bandwidth
  • damping tuning
  • energy harvesting
  • impedance tuning

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