Analog self-powered harvester achieving switching pause control to increase harvested energy

Kanjuro Makihara, Kei Asahina

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this paper, we propose a self-powered analog controller circuit to increase the efficiency of electrical energy harvesting from vibrational energy using piezoelectric materials. Although the existing synchronized switch harvesting on inductor (SSHI) method is designed to produce efficient harvesting, its switching operation generates a vibration-suppression effect that reduces the harvested levels of electrical energy. To solve this problem, the authors proposed - in a previous paper - a switching method that takes this vibration-suppression effect into account. This method temporarily pauses the switching operation, allowing the recovery of the mechanical displacement and, therefore, of the piezoelectric voltage. In this paper, we propose a self-powered analog circuit to implement this switching control method. Self-powered vibration harvesting is achieved in this study by attaching a newly designed circuit to an existing analog controller for SSHI. This circuit aims to effectively implement the aforementioned new switching control strategy, where switching is paused in some vibration peaks, in order to allow motion recovery and a consequent increase in the harvested energy. Harvesting experiments performed using the proposed circuit reveal that the proposed method can increase the energy stored in the storage capacitor by a factor of 8.5 relative to the conventional SSHI circuit. This proposed technique is useful to increase the harvested energy especially for piezoelectric systems having large coupling factor.

Original languageEnglish
Article number055007
JournalSmart Materials and Structures
Volume26
Issue number5
DOIs
Publication statusPublished - 2017 Apr 10

Keywords

  • analog circuit
  • piezoelectric
  • SCVS (switching considering vibration suppression)
  • self-powered
  • SSHI (synchronized switch harvesting on inductor)
  • switching control
  • vibration harvesting

ASJC Scopus subject areas

  • Signal Processing
  • Atomic and Molecular Physics, and Optics
  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Analog self-powered harvester achieving switching pause control to increase harvested energy'. Together they form a unique fingerprint.

  • Cite this