Anzola, Jon Aizpuru, Iosu Arruti Romero, Asier Alacano Loiti, Argiñe López-Erauskin, Ramón Artal-Sevil, Jesús S. Bernal, Carlos Review of architectures based on partial power processing for DC-DC applications IEEE Access 10.1109/ACCESS.2020.2999062 2020 2020