Active AC/DC control for wideband piezoelectric energy harvesting

Abstract : This paper proposes a simple interface circuit enabling resonant frequency tuning of highly coupled piezoelectric harvesters. This work relies on an active AC/DC architecture that introduces a tunable short-circuit sequence in order to control the phase between the piezoelectric current and voltage, allowing the emulation of a capacitive load. It is notably shown that this short-circuit time increases the harvested power when the piezoelectric operates outside of resonance. Measurements on a piezoelectric harvester exhibiting a large global coupling coefficient (k2 =15.3%) have been realized and have proven the efficiency and potential of this technique.
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Submitted on : Saturday, August 12, 2017 - 11:09:28 PM
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Adrien Morel, Romain Grézaud, Gaël Pillonnet, Pierre Gasnier, Ghislain Despesse, et al.. Active AC/DC control for wideband piezoelectric energy harvesting. 16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2016), Dec 2016, Paris, France. ⟨10.1088/1742-6596/773/1/012059⟩. ⟨hal-01574297⟩

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