Adaptive piezoelectric energy harvesting circuit for wireless remote power supply

Geffrey K. Ottman, Heath F. Hofmann, Archin C. Bhatt, George A. Lesieutre

Research output: Contribution to journalArticlepeer-review

1015 Scopus citations

Abstract

This paper describes an approach to harvesting electrical energy from a mechanically excited piezoelectric element. A vibrating piezoelectric device differs from a typical electrical power source in that it has a capacitive rather than inductive source impedance, and may be driven by mechanical vibrations of varying amplitude. An analytical expression for the optimal power flow from a rectified piezoelectric device is derived, and an "energy harvesting" circuit is proposed which can achieve this optimal power flow. The harvesting circuit consists of an ac-dc rectifier with an output capacitor, an electrochemical battery, and a switch-mode dc-dc converter that controls the energy flow into the battery. An adaptive control technique for the dc-dc converter is used to continuously implement the optimal power transfer theory and maximize the power stored by the battery. Experimental results reveal that use of the adaptive dc-dc converter increases power transfer by over 400% as compared to when the dc-dc converter is not used.

Original languageEnglish (US)
Pages (from-to)669-676
Number of pages8
JournalIEEE Transactions on Power Electronics
Volume17
Issue number5
DOIs
StatePublished - Sep 2002

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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