Fast-Convergence Self-Adjusting SECE Circuit With Tunable Short-Circuit Duration Exhibiting 368% Bandwidth Improvement

Adrien Morel (1, 2) , A. Quelen (2) , C. Berlitz (2) , D. Gibus (1, 2) , P. Gasnier (2) , A. Badel (1) , G. Pillonnet (2)

1 SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique
2 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information

The harvesting frequency bandwidth (HBW) of a resonant-based electromechanical harvester is inherently limited by its quality factor. Electrical tuning of the resonant frequency leveraged by a significant electromechanical coupling is a promising approach to enhance the HBW and paves the way toward industrialization of robust vibration energy harvesting system. However, it remains challenging to design a self-powered harvesting IC that includes self-tuning capabilities, especially at low vibration amplitude. This paper describes the shorted synchronous electrical charge extraction (SSECE) strategy and proposes a dedicated self-powered integrated circuit including power stage, sensors to sequence the harvesting phases and power sensing. An on-chip tracker dynamically maximizes the harvesting power when the piezoelectric-based harvester characteristics or excitation frequency shifts. The experimental results show a 368% HBW enlargement with the highest convergence FoM (0.213) and the lowest power-peak frequency compared to prior art.

Mots clés: Frequency tuning; Piezoelectricity; Self-tuning; Synchronous harvesting strategy; Vibrations energy harvesting; Energy harvesting; MPPT; Integrated circuit; Electrical interface

Domaines: Energie électrique; Electronique; Micro et nanotechnologies/Microélectronique

Adrien Morel, A. Quelen, C. Berlitz, D. Gibus, P. Gasnier, et al.. Fast-Convergence Self-Adjusting SECE Circuit With Tunable Short-Circuit Duration Exhibiting 368% Bandwidth Improvement. IEEE Solid-State Circuits Letters, 2020, 3, pp.222-225. ⟨10.1109/LSSC.2020.3012340⟩. ⟨hal-02915548⟩