Int. J. Industrial Electronics and Drives, Vol. 1, No. 1, 2009 25 Copyright © 2009 Inderscience Enterprises Ltd. Design of hysteretic regulators for low voltage and high-current applications Juan Cruz*, Miguel Castilla, Jaume Miret and Jose Luis Garcia de Vicuña Department of Electronics Engineering, Universidad Politecnica de Catalunya (UPC), Avda. Víctor Balaguer, s/n – Vilanova i la Geltrú, 08800 Barcelona, Spain Fax: +34 93-896 77 00 E-mail: jcvaquer@eel.upc.edu E-mail: mcastilla@eel.upc.edu E-mail: jmiret@eel.upc.edu E-mail: vicuna@eel.upc.edu *Corresponding author Josep M. Guerrero Dept. Enginyeria de Sistemes Automàtica i Informàtica Industrial (ESAII), Escola Universitària d’Enginyeria Tècnica Industrial de Barcelona (EUETIB), Universitat Politècnica de Catalunya (UPC), Compte d’Urgell, 187, 08036 Barcelona, Spain Fax: +34 93-4137401 E-mail: josep.m.guerrero@upc.edu Abstract: The present work proposes the design of hysteretic regulators intended for applications with low-voltage and high-current loads. The objective of the control design is the optimisation of the load transient response, by means of the imposition of resistive closed-loop output impedance. The main contribution of the work is the extension of the control design of a single regulator to the multiphase regulator case. Selected simulation and experimental results are reported in order to validate both the regulator performance and the proposed control design procedure. Keywords: hysteretic controller; interleaving; current equalisation; multiphase regulator; adaptive voltage positioning; AVP; sliding surface. Reference to this paper should be made as follows: Cruz, J., Castilla, M., Miret, J., de Vicuña, J.L.G. and Guerrero, J.M. (2009) ‘Design of hysteretic regulators for low voltage and high-current applications’, Int. J. Industrial Electronics and Drives, Vol. 1, No. 1, pp.25–33. Biographical notes: Juan Cruz received his BS in Industrial Electronics from UPC in 1989 and his MS in Electronics Engineering at UAB in 1997. Since 1995, he has been an Assistant Professor at the Department of Electronics Engineering at UPC, Vilanova i la Geltrú, Spain, where he teaches courses on digital design and electronics technology. His research interests include DC/DC for low voltage applications and analogue and digital control. Miguel Castilla received his BS, MS and PhD in Telecommunication Engineering from the UPC, Barcelona, Spain in 1988, 1995 and 1998, respectively. Since 2002, he has been an Associate Professor at the Department of Electronics Engineering, UPC, Vilanova i la Geltrú, Spain, where he teaches courses on analogue circuits and power electronics. His research interests are in the areas of power electronics, non-linear control and renewable energy systems. Jaume Miret received his BS in Telecommunications, MS and PhD in Electronics from the UPC, Barcelona, Spain in 1992, 1999 and 2005, respectively. He has been an Assistant Professor at the Department of Electronics Engineering, UPC, Vilanova i la Geltrú, Spain since 1993, where he teaches courses on digital design and circuit theory. His research interests include DC-to-AC converters, active power filters and digital control.