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

Abstract : 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.
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Submitted on : Friday, August 14, 2020 - 5:05:20 PM
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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⟩

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