An Accurate Time-Based MPPT Circuit With Two-Period Tracking Algorithm and Convergence Range Averaging Technique for IoT Applications

This article proposes a highly efficient Time-Based Maximum-Power-Point-Tracking (TB-MPPT) integrated-circuit. Conventional TB-MPPT circuit shows unstable status (oscillation) near the Maximum Power Point (MPP), which causes degradation of overall power tracking efficiency. To overcome this critical issue, proposed separates operation into two periods, and it utilizes convergence range averaging technique with an adaptive perturbation step according to each control signal accurately extract current level without oscillation problem. work is fabricated in 180 nm CMOS process demonstrate advantages scheme. With 0.47V 12mW Photovoltaic (PV) cell, measurement results show 94.2% MPPT efficiency 91.6% conversion (PCE). It occupies silicon chip area 1.69 mm 2 .