Design of an integrated Maximum Power Point Boost Converter for PV Submodules

Abstract:
The design constitutes an integrated boost controller with MPPT, targeting the optimization of power output of solar submodules, boosting system efficiency in partially shaded conditions compared to conventional PV panels. The negative impact on output power, caused by cell mismatch due to production and long-term degradation, can be minimized. The IC is designed for power throughputs up to 120W with an input voltage range of 7V - 24V and output voltages up to 50V. The converter operates at a switching frequency of 300 kHz in current mode control and is internally compensated. During low irradiance, the controller changes to pulse-frequency operation to further increase efficiency. The MPPT utilizes a δ modulator, avoiding the need for high resolution ADCs. The sense structure dynamically adjusts the MPP measurement resistance, further increasing tracking efficiency.