Configurable FOCV- Based MPPT for Indoor Light and TEG Energy Harvesting Systems

This study introduces a configurable Maximum Power Point Tracker (MPPT) designed for energy harvesting systems, focusing on optimizing output power from ambient light using photovoltaic (PV) cells and heat gradient from thermoelectric generators (TEG). Utilizing the Fractional Open Circuit Voltage (FOCV) algorithm, the configurable MPPT system achieves a tracking efficiency that exceeds 90 percent for PV cells and over 70 percent for TEG. Notably, it demonstrates excellent performance in tracking the Vmpp for PV cells for 0.8V to 1.2V input voltage. Also, it effectively tracks the Vmpp for TEG systems, consistently maintaining a stable output response for input voltages below 0.6V relative to Voc. The power consumption of the MPPT system remained relatively low, measuring <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$246.4\text{uW}$</tex> when a PV source is utilized and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$217.5\text{uW}$</tex> when a TEG source is employed, indicating efficient operation.