Design of Piezoelectric Energy Harvester with an Adaptive MPPT for Efficient Power Extraction

This study presents a piezo electric energy harvester that includes a dedicated maximum power point tracking (MPPT) control scheme will be introduced to improve efficiency of energy harvesting using mechanical vibrations in the atmosphere because of the reduction of the impedance mismatch between piezo transducers and electronic devices. The general structure of the proposed harvester is a cantilever piezo transducer that is manufactured using lead zirconate titanate (PZT) ceramic and that has been optimized to operate at a resonant frequency of 60 Hz and a power moderator circuit that operates on less than 10 W and that includes a step-up voltage converter and a Schottky diode bridge rectifier. a microcontroller-based MPPT controller that is based on an adapted perturb-and-observe algorithm with adaptable step size; and an energy-store interface MPPT algorithm is continuously measuring the system voltage and current by using high-precision sensing circuits and dynamically controls the load impedance of the piezo transducer to the electrical load by using a digital potentiometer. Keyword -- Energy harvesting technique, maximum power point tracking for improved power efficiency, piezoelectric transducers, mechanical stress, wireless sensor networks, power management, renewable energy source.