The paper presents a power converter for piezoelectric energy harvesting implementing a modified version of synchronous electrical charge extraction with quiescent current as low as 160 nA. The input energy is increased of more than 200% for weak vibrations, by inverting the residual charge left on the capacitance of the transducer after each energy extraction. Moreover, a power management policy, named two-way energy storage, is introduced in order to improve significantly the efficiency of the energy harvesting system in battery-less systems during the start-up phase, when the energy storage is fully depleted. The converter behaves as a buck-boost converter and the measured peak efficiency is 85.3%. The IC has been designed in a 0.32 μm BCD technology from STMicroelectronics in an active area of 0.95 mm^2.

A Nano-Power Synchronous Charge Extractor IC for Low Voltage Piezoelectric Energy Harvesting with Residual Charge Inversion

DINI, MICHELE;ROMANI, ALDO;FILIPPI, MATTEO;TARTAGNI, MARCO
2016

Abstract

The paper presents a power converter for piezoelectric energy harvesting implementing a modified version of synchronous electrical charge extraction with quiescent current as low as 160 nA. The input energy is increased of more than 200% for weak vibrations, by inverting the residual charge left on the capacitance of the transducer after each energy extraction. Moreover, a power management policy, named two-way energy storage, is introduced in order to improve significantly the efficiency of the energy harvesting system in battery-less systems during the start-up phase, when the energy storage is fully depleted. The converter behaves as a buck-boost converter and the measured peak efficiency is 85.3%. The IC has been designed in a 0.32 μm BCD technology from STMicroelectronics in an active area of 0.95 mm^2.
Michele Dini; Aldo Romani; Matteo Filippi; Marco Tartagni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/451569
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