Optimized piezoelectric energy harvesting circuit using step-down converter in discontinuous conduction mode

Geffrey K. Ottman, Heath F. Hofmann, George A. Lesieutre

Research output: Contribution to journalConference article

31 Scopus citations

Abstract

An optimized method of harvesting vibrational energy with a piezoelectric element using a step-down DC-DC converter is presented. In this configuration, the converter regulates the power flow from the piezoelectric element to the desired electronic load. Analysis of the converter in discontinuous current conduction mode results in an expression for the duty cycle-power relationship. Using parameters of the mechanical system, the piezoelectric element, and the converter an optimal duty cycle can be determined where the harvested power is maximized for a given frequency of mechanical excitation. It is shown that, as the magnitude of the excitation increases, the optimal duty cycle becomes essentially constant, greatly simplifying the control of the step-down converter. The expression is validated with experimental data showing that the optimal duty cycle can be accurately determined and maximum energy harvesting attained. A circuit is proposed which implements this relationship, and experimental results show that the converter increases the harvested power by approximately 325%.

Original languageEnglish (US)
Pages (from-to)1988-1994
Number of pages7
JournalPESC Record - IEEE Annual Power Electronics Specialists Conference
Volume4
StatePublished - Jan 1 2002
Event2002 IEEE 33rd Annual Power Electronics Specialists Conference (PESC) - Cairns, Australia
Duration: Jun 23 2002Jun 27 2002

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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