Applicability of Self-Powered Synchronized Electric Charge Extraction (SECE) Circuit for Piezoelectric Energy Harvesting

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Author(s) Action Nechibvute | Pearson Luhanga | Albert Chawanda
Pages 623-627
Volume 4
Issue 11
Date November, 2014
Keywords Synchronised electric charge extraction, energy harvesting, Interface circuit, piezoelectric, self-powered

Abstract

In recent years, nonlinear techniques have been proposed to enhance the energy harvested capabilities of piezoelectric generators. Among these techniques, synchronous electric charge extraction (SECE) has been one that has been investigated. The SECE technique is principally a power conversion process that harvests electrical energy when charge accumulated on the intrinsic capacitance of the piezoelectric material reaches a maximum. In this work, we present the results of experimental investigations of the performance of a self-powered SECE interface circuit designed round the self-powered electronic breaker which employs PNP and NPN transistors for switching. The experimental results show that for the piezoelectric bimorph transducer used, the self-powered SECE circuit can harvest up to about 70 % more power compared to the standard energy harvesting (SEH) interface circuit.

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