Short Circuit Synchronous Electric Charge Extraction (SC-SECE) Strategy for Wideband Vibration Energy Harvesting

Adrien Morel (1, 2) , P. Gasnier (1) , Y. Wanderoild (1) , Gaël Pillonnet (3) , A. Badel (2)

1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
2 SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique
3 DACLE-LETI - Département d'Architectures, Conception et Logiciels Embarqués-LETI

This paper presents an energy harvesting strategy called Short Circuit Synchronous Electric Charge Extraction (SC-SECE), which is an improvement of the SECE strategy for highly coupled piezoelectric generators. The SC-SECE strategy is based on the control of a short-circuit through two tuning parameters. The first one, í µí½“ í µí±º , represents the phase between the displacement extrema and the energy harvesting event. The second, í µí¼Ÿí µí½“, is the angle difference between the beginning and end of the short-circuit phase. The performance of this strategy has been compared to other interfaces such as the SECE and the capacitance tuning approach. However, with the SC-SECE strategy, both the power and bandwidth are greatly improved. Experimental measurements have been performed on a highly-coupled piezoelectric harvester (k m 2 =0.48) which provides a maximal harvestable power P lim of 6µW under an extremely low vibration amplitude (0.03G). We have been able to harvest more than 50% of this P lim over a large frequency band, from 90Hz to 140Hz. These results demonstrate the excellent potential of this strategy for extending the bandwidth of piezoelectric vibration energy harvesters.

Mots clés: Vibration Energy Harvesting; Multiphysics - Modeling; Piezoelectricity; Interface circuit; Short-circuit control; SECE; Nonlinear circuits

Domaines: Sciences de l'ingénieur [physics]; Energie électrique; Electronique; Mécanique [physics.med-ph]

Adrien Morel, P. Gasnier, Y. Wanderoild, Gaël Pillonnet, A. Badel. Short Circuit Synchronous Electric Charge Extraction (SC-SECE) Strategy for Wideband Vibration Energy Harvesting. 2018 IEEE International Symposium on Circuits and Systems (ISCAS), May 2018, Florence, Italy. pp.1-5. ⟨hal-02013371⟩