Hybrid Control for a 4-Cell PV String: Spintronic Bypass Management with Classical MPPT

This report presents a hybrid control architecture for a series-connected string of four photovoltaic cells as a pedagogical exercise. A spintronic 4×4 crossbar is used exclusively to monitor per-cell voltages and activate the corresponding bypass MOSFETs in nanoseconds, while a conventional digital microcontroller runs a classical MPPT algorithm for string-level optimization. The note uses this hybrid “crossbar bypass + digital MPPT” architecture as an educational case study for PV shadow management.