A smart storage and high efficient pvemg based energy harvesting system for portable device charger

Abstract

In this research work, proposed a smart storage and highly efficient photovoltaic/electromagnetic generator based energy harvesting system for a portable device charging application. In our day-to-day life usage of portable devices, particularly smartphones, hold a significant role. It needs recharging the battery frequently and they consume more energy. Hence, harvesting energy from the environment solves frequent battery charging of portable devices. Among the various energy sources available in the environment, for the size and availability, solar and vibration energies discovered for this energy harvesting application. A key challenge of energy harvesting is that the output power from the harvester is unavailable in the required form. It needs to design energy harvesters with improved energy conversion techniques, to regulate and to produce maximum efficiency from integrating the solar and vibration energy harvester. Firstly this thesis presents the structure of an individual input multi-stage hybrid system that comprises a conventional DC-DC converter, AC-DC Converter and bidirectional converter which possess high efficiency. To draw the maximum power from the solar Photovoltaic by PandO based Maximum Power Point Tracking (MPPT) Algorithm. A hysteresis comparator based voltage multiplier is to harvest the energy from a vibration source with good voltage gain. It provides a constant current and constant voltage charge control. This controls the charging and discharging of the battery in the portable device To improve system efficiency, a converter with a unified structure proposed. The projected structure employs switches which controlled independently through different duty ratios. With such duty ratios, tracking of the photovoltaic origins with the maximum power, and controlling the battery power is possible. The power is provided to the portable charging device from the input power sources by either making the battery to charge or discharge separately or concurrently. With results obtained using simulation analysis, the validity concerning the proposed converter as well as its control performance has been checked under various operating conditions. To improve the performance of the projected system, a bidirectional USB multi-input energy harvesting converter designed. This converter includes the bidirectional switch. It has the capability of delivering the power to the portable charging device through the solar and vibration harvester unless otherwise the battery is charged through the DC USB port. It leads to improving system reliability and efficiency. The entire system is developed using the MATLAB/SIMULINK environment, and the simulation results are validated experimentally newline