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behavioral modeling of a piezoelectric harvester with adaptive energy-investment for improved battery charging

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING 2021年第1期106卷 249-259页

作者： Bortolin, Tales Luiz Aita, Andre Luiz Fed Univ Santa Maria UFSM Postgrad Course Comp Sci PPGCC Santa Maria RS Brazil Fed Univ Santa Maria UFSM Dept Elect & Comp Santa Maria RS Brazil

This work describes the behavior of a piezoelectric energy harvesting system that uses a single inductor and the concept of energy investment for the whole of building a behavioral model for the harvester and a high-level system analysis approach. The harvester modules and control were specified and described in verilog-A to fully model the energy harvester operation. simulation results have shown the harvesting mechanism based on the concept of energy-investment and model accuracy, and the effect of the invested energy on the battery charging profile, highlighting the trade-off a constant energy investment time poses to the harvester, unable to meet the requirements a non-constant input vibration sets to system. An adaptive energy investment time based on a P&O algorithm was proposed to cope with this trade-off and added to the harvester model. Performed simulations with adaptive energy investment have shown improved energy harvesting, and that such improvement increases as the input power increases, since the system can tune the energy investing mechanism to the input vibrations.

关键词： Piezoelectric energy harvesters Energy-investing harvesters verilog-a behavioral modeling and simulation Perturb and observe algorithm

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behavioral modeling of a Control Module for an Energy-investing Piezoelectric Harvester 19

Behavioral Modeling of a Control Module for an Energy-invest...

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32nd Symposium on Integrated Circuits and Systems Design (SBCCI)

作者： Bortolin, Tales Luiz Aita, Andre Luiz dos Santos Martins, Joao Baptista Fed Univ Santa Maria UFSM Postgrad Comp Sci CPGCC Santa Maria RS Brazil Fed Univ Santa Maria UFSM Dept Elect & Comp DELC Santa Maria RS Brazil

ISBN: (纸本)9781450368445

This work analyzes a piezoelectric energy harvesting system that uses a single inductor and the concept of energy investment. The harvester behavior, with special focus on its control logic module and state machine, is fully described and modeled in verilog-A. The needed sensors and control variables were also identified and modeled. simulation results have shown the correct behavioral modeling of the piezoelectric energy harvester system and proposed control, highlighting the harvesting mechanism based on the concept of energy-investment and the effect of the energy invested on the characteristics of the battery charging profile. The speed of the behavioral simulations when compared to electrical ones and the obtained model accuracy, have shown a reliable and prospective higher-level design approach.

关键词： verilog-a behavioral modeling and simulation Piezoelectric harvesters Energy-investing harvesters

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