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Maximizing the output power of a piezoelectric generator from the admittance measurement by selecting the rectification technique

: Mateu, L.

Twiefel, J. ; Leibniz Universität Hannover, Institut für Dynamik und Schwingungen:
10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop 2013. Proceedings : Hannover, July 14th - July 17th, 2013
Garbsen: PZH Verlag, 2013 (Berichte aus dem IDS 2013,5)
ISBN: 978-3-944586-10-6
International Workshop on Piezoelectric Materials and Applications (IWPMA) <10, 2013, Hannover>
Energy Harvesting Workshop (EHW) <8, 2013, Hannover>
Fraunhofer IIS ()

AC-DC converters employed for harvesting power from piezoelectric transducers can be divided into linear (i.e. diode bridge) and non-linear techniques (i.e. synchronized switch harvesting on inductor, SSHI). Depending on the piezoelectric element, a non-linear technique can improve a significant percentage the power harvested. This paper presents an analytical technique based on the measurement of the impedance circle of the piezoelectric element to determine whether the diode bridge harvests a considerable percentage of the available power.