Experimental Study of Energy Harvesting using a Self-Powered SSHI Interface Circuit

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Author(s) Action Nechibvute | Pearson Luhanga | Albert Chawanda
Pages 455-462
Volume 4
Issue 8
Date August, 2014
Keywords Synchronised switching circuit, energy harvesting, Interface circuit, piezoelectric, self-powered

Abstract

The harvesting of energy from a vibrating structure using a piezoelectric bimorph transducer and a simple synchronised switching circuit is investigated experimentally. The switching circuit employed is a parallel synchronized switch harvesting on inductor (SSHI) interface that employs a self-powered electronic circuit breaker. The experimental results show that for the piezoelectric bimorph transducer used, the self-powered SSHI circuit can harvest up to 197 % more power compared to the standard energy harvesting (SEH) interface circuit. While the self-powered SSHI circuit evidently enhances the power harvested by a piezoelectric transducer, the experimental results show that at very low excitation levels the self-powered SSHI does not always outperform the standard circuit. This observation is seldom reported in literature on energy harvesting using nonlinear techniques. The results also suggest that as the excitation level increases, the performance of self-powered SSHI gets more beneficial compared to the SEH interface.

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