1. Department of Industrial TechnologiesUniversidad de TalcaCuricóChile
2. Electronics Engineering DepartmentUniversidad Técnica Federico Santa MaríaValparaíso2390123Chile
3. Power Electronics GroupTechnische Universität DresdenDresden01062Germany
4. Department of Electrical EngineeringUniversidad de ConcepciónConcepción160‐CChile