[en] This PhD thesis is presented as a set of publications, dissertation, according to the regulations in force at the Miguel Hernandez University of Elche. The structure of the PhD thesis consists of a general introduction, a summary of the methodology used and the structure of the rest of chapters, discussion of the work organized in three different chapters which are the core of the research and the final conclusions. Three international papers and two prestigious international conferences are presented and all of them are related to different aspects of multidevice, multiphase DC-DC conversion. The main focus of this PhD thesis is around the conception, design and experimental validation of different bidirectional, non-isolated DC-DC conversion techniques with the aim of increasing the power density ratio (kW/dm3) of the electronic power conversion systems, as well as to improve its reliability and redundancy. The methods presented hereafter could be used in many fields such as distributed energy systems based on fuel cells, electrical vehicle and space power systems. The publications of this PhD thesis are the following: •! A. Garrigós, F. Sobrino-Manzanares, "Interleaved multi-phase and multi-switch boost converter for fuel cell applications," International Journal of Hydrogen Energy, vol. 40, pp. 8419-8432, Jul. 2015. JCR metrics (2014 – there is not updated data for 2015 yet) – Impact Factor: 3.313. Quartile: Q1 (Electrochemistry, position 7 out 28), Q2 (Energy & Fuels, position 25 out 89). •! F. Sobrino-Manzanares, A. Garrigós, "Interleaved, Multi-Switch, Multi-Phase Boost converter For Battery Discharge Regulators," 11th European Space Power Conference, Thessaloniki, Greece, 2016. •! F. Sobrino-Manzanares, A. Garrigós, "An interleaved, FPGA-controlled, multi-phase and multiswitch synchronous boost converter for fuel cell applications," International Journal of Hydrogen Energy, vol. 40, pp. 12447-12456, Sep. 2015. JCR metrics (2014 – there is not updated data for 2015 yet) – Impact Factor: 3.313. Quartile: Q1 (Electrochemistry, position 7 out 28), Q2 (Energy & Fuels, position 25 out 89). •! F. Sobrino-Manzanares, A. Garrigós, "Bidirectional, interleaved, multiphase, multidevice, softswitching, FPGA controlled, buck-boost converter with PWM real-time reconfiguration," IEEE Trans Power Electron (REVIEW). JCR metrics (2014 – there is not updated data for 2015 yet) – Impact Factor: 6.008. Quartile: Q1 (Engineering, electrical & electronic, position 3 out 249). •! F. Sobrino-Manzanares, A. Garrigós, "A generic FPGA based PWM generator with automatic device fault recovery for fuel cell, interleaved, multi-phase and multi-switch DC/DC boost converters," 21st World Hydrogen Energy Conference 2016, Zaragoza, Spain, 13-16th June, 2016.

[es] Esta tesis doctoral se presenta con un conjunto de publicaciones, de acuerdo a la normativa vigente en la Universidad Miguel Hernández de Elche. La estructura de la tesis consta de una introducción general, un resumen de la metodología empleada y la estructura del resto de capítulos, una discusión del trabajo realizado en tres capítulos distintos que conforman el núcleo de las publicaciones y unas conclusiones finales. Se presentan tres artículos internacionales más dos publicaciones en congresos internacionales de reconocido prestigio, relacionados con diferentes aspectos de la conversión DC-DC multidispositivo y multifase. El tema central de la tesis es la concepción, diseño y verificación experimental de distintas técnicas de conversión DC-DC bidireccional, sin aislamiento galvánico con el objetivo de aumentar la densidad de potencia (kW/dm3) de los sistemas electrónicos de potencia, así como aumentar el grado de fiabilidad y redundancia. Las técnicas aquí presentadas tienen adaptación en diversos campos tales como los sistemas energéticos distribuidos basados en pila de combustible, vehículo eléctrico y sistemas espaciales. Las publicaciones que conforman la tesis son las siguientes: A. Garrigós, F. Sobrino-Manzanares, "Interleaved multi-phase and multi-switch boost converter for fuel cell applications," International Journal of Hydrogen Energy, vol. 40, pp. 8419-8432, Jul. 2015. JCR metrics (2014 – no hay datos disponibles para 2015 en la fecha de redacción de este documento) – Impact Factor: 3.313. Cuartil: Q1 (Electrochemistry, posición 7 de 28), Q2 (Energy & Fuels, posición 25 de 89). •! F. Sobrino-Manzanares, A. Garrigós, "Interleaved, Multi-Switch, Multi-Phase Boost converter For Battery Discharge Regulators," 11th European Space Power Conference, Thessaloniki, Greece, 2016. •! F. Sobrino-Manzanares, A. Garrigós, "An interleaved, FPGA-controlled, multi-phase and multiswitch synchronous boost converter for fuel cell applications," International Journal of Hydrogen Energy, vol. 40, pp. 12447-12456, Sep. 2015. JCR metrics (2014 – no hay datos disponibles para 2015 en la fecha de redacción de este documento) – Impact Factor: 3.313. Cuartil: Q1 (Electrochemistry, posición 7 de 28), Q2 (Energy & Fuels, posición 25 de 89). •! F. Sobrino-Manzanares, A. Garrigós, "Bidirectional, interleaved, multiphase, multidevice, softswitching, FPGA controlled, buck-boost converter with PWM real-time reconfiguration," IEEE Trans Power Electron (EN REVISIÓN). JCR metrics (2014 – no hay datos disponibles para 2015 en la fecha de redacción de este documento) – Impact Factor: 6.008. Cuartil: Q1 (Engineering, electrical & electronic, posición 3 de 249).F. Sobrino-Manzanares, A. Garrigós, "A generic FPGA based PWM generator with automatic device fault recovery for fuel cell, interleaved, multi-phase and multi-switch DC/DC boost converters," 21st World Hydrogen Energy Conference 2016, Zaragoza, Spain, 13-16th June, 2016.