Behavioral Modeling of a Control Module for an Energy-investing Piezoelectric Harvester

Abstract

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.