Envíos recientes

  • A comprehensive model for lithium-ion batteries: from the physical principles to an electrical model 

    Berrueta Irigoyen, Alberto; Urtasun Erburu, Andoni Upna; Ursúa Rubio, Alfredo Upna; Sanchís Gúrpide, Pablo Upna (Elsevier, 2018)   Artículo / Artikulua
    The growing interest in e-mobility and the increasing installation of renewable energy-based systems are leading to rapid improvements in lithium-ion batteries. In this context, battery manufacturers and engineers require ...
  • Rectangular waveguide filters with meandered topology 

    Teberio Berdún, Fernando Upna; Percaz Ciriza, Jon Mikel Upna; Arregui Padilla, Iván Upna; Martín Iglesias, Petronilo; Lopetegui Beregaña, José María Upna; Gómez Laso, Miguel Ángel Upna; Arnedo Gil, Israel Upna (IEEE, 2018)   Artículo / Artikulua
    In this paper, a new topology for rectangular waveguide bandpass and low-pass filters is presented. A simple, accurate, and robust design technique for these novel meandered waveguide filters is provided. The proposed ...
  • State-of-charge-based droop control for stand-alone AC supply systems with distributed energy storage 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
    The droop method is an advantageous technique for stand-alone AC supply systems, allowing for power sharing among various inverters with no need for communication cables. However, in stand-alone systems with multiple ...
  • Control of a single-switch two-input buck converter for MPPT of two PV strings 

    Urtasun Erburu, Andoni Upna; Dah-Chuan Lu, Dylan (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    In this paper, the Two-Input Buck (TIBuck) converter is proposed as the DC/DC stage for photovoltaic (PV) cascaded converters. This converter is attractive for this application because it is cost-effective and reliable and ...
  • High frequency power transformers with foil windings: maximum interleaving and optimal design 

    Barrios Rípodas, Ernesto Upna; Urtasun Erburu, Andoni Upna; Ursúa Rubio, Alfredo Upna; Marroyo Palomo, Luis Upna; Sanchís Gúrpide, Pablo Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    Foil conductors and primary and secondary interleaving are normally used to minimize winding losses in high frequency transformers used for high-current power applications. However, winding interleaving complicates the ...
  • Frequency-based energy management strategy for stand-alone systems with distributed battery storage 

    Urtasun Erburu, Andoni Upna; Barrios Rípodas, Ernesto Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    Distributed generation is an attractive solution for stand-alone AC supply systems. In such systems, the installation of two or more energy-storage units is recommended for system redundancy and may also be required when ...
  • Energy management strategy for a battery-diesel stand-alone system with distributed PV generation based on grid frequency modulation 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Barricarte Rivas, David; Marroyo Palomo, Luis Upna (Elsevier, 2014)   Artículo / Artikulua  OpenAccess
    A hybrid PV-Battery-Diesel configuration is very attractive for stand-alone systems in terms of cost and reliability. In many applications, the battery and the diesel generator are centralized and generate the AC grid while ...
  • Small wind turbines sensorless MPPT: robustness analysis and lossless approach 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2014)   Artículo / Artikulua  OpenAccess
    The configuration Permanent Magnet Synchronous Generator (PMSG) with diode bridge is frequently used in small Wind Energy Conversion Systems (WESC) thanks to its reliability and low cost. In order to perform a sensorless ...
  • Modeling of small wind turbines based on PMSG with diode bridge for sensorless maximum power tracking 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; San Martín Biurrun, Idoia Upna; López Taberna, Jesús; Marroyo Palomo, Luis Upna (Elsevier, 2013)   Artículo / Artikulua  OpenAccess
    The Permanent Magnet Synchronous Generator (PMSG) with diode bridge is frequently used in small Wind Energy Conversion Systems (WECS). This configuration is robust and cheap, and therefore suitable for small WECS. In order ...
  • Fabrication of Bragg gratings on the end facet of standard optical fibers by sputtering the same material 

    Ascorbe Muruzabal, Joaquín Upna; Corres Sanz, Jesús María Upna; del Villar, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2016)   Artículo / Artikulua  OpenAccess
    A sputtering process has been applied to deposit quarter-wavelength stacks on the end facet of cleaved optical fibers by using only one sputtering target. Standard multimode optical fibers were used as substrates to fabricate ...
  • Adaptive voltage control of the DC/DC boost stage in PV converters with small input capacitor 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2013)   Artículo / Artikulua  OpenAccess
    In the case of photovoltaic (PV) systems, an adequate PV voltage regulation is fundamental in order to both maximize and limit the power. For this purpose, a large input capacitor has traditionally been used. However, when ...
  • Study and optimization of self-assembled polymeric multilayer structures with neutral red for pH sensing applications 

    Goicoechea Fernández, Javier Upna; Arregui San Martín, Francisco Javier Upna; Corres Sanz, Jesús María Upna; Matías Maestro, Ignacio Upna (Hindawi / Wiley, 2008)   Artículo / Artikulua  OpenAccess
    The characterization of nanostructured thin films is critical in the design and fabrication of optical sensors. Particularly, this work is a detailed study of the properties of layer-by-layer electrostatic self-assembled ...
  • Photonic crystal fiber temperature sensor based on quantum dot nanocoatings 

    Larrión Zabaleta, Beatriz; Hernáez Sáenz de Zaitigui, Miguel Upna; Arregui San Martín, Francisco Javier Upna; Goicoechea Fernández, Javier Upna; Bravo Larrea, Javier Upna; Matías Maestro, Ignacio Upna (Hindawi / Wiley, 2009)   Artículo / Artikulua  OpenAccess
    Quantum dot nanocoatings have been deposited by means of the Layer-by-Layer technique on the inner holes of Photonic Crystal Fibers (PCFs) for the fabrication of temperature sensors. The optical properties of these sensors ...
  • Nonlinear dynamics of vertical-cavity surface-emitting lasers 

    Panajotov, Krassimir; Sciamanna, Marc; Gatare, Ignace; Arizaleta Arteaga, Mikel; Thienpont, Hugo (Hindawi / Wiley, 2011)   Artículo / Artikulua  OpenAccess
    Nonlinear dynamics of Vertical-Cavity Surface-Emitting Lasers (VCSELs) induced by optical injection, optical feedback, current modulation and mutual coupling is reviewed. Due to the surface emission and cylindrical symmetry ...
  • A modified control scheme of Droop-based converters for power stability analysis in microgrids 

    Usunariz López, Igor; Santamaría Rubio, Mikel; Mentesidi, Konstantina; Aguado Alonso, Mónica Upna (Hindawi / Wiley, 2015)   Artículo / Artikulua  OpenAccess
    Microgrid is principally an active distribution network since it aggregates numerous DG systems through their interface converters and different loads at distribution level. This paper discusses the power sharing in ...
  • Gain improvement of dual band antenna based on complementary rectangular split-ring resonator 

    Ortiz Pérez de Eulate, Noelia Upna; Falcone Lanas, Francisco Javier Upna; Sorolla Ayza, Mario Upna (Hindawi / Wiley, 2012)   Artículo / Artikulua  OpenAccess
    A simple and successful dual band patch linear polarized rectangular antenna design is presented. The dual band antenna is designed etching a complementary rectangular split-ring resonator in the patch of a conventional ...
  • Wideband channel modeling for mm-wave inside trains for 5G-related applications 

    Moreno García-Loygorri, Juan; Briso Rodríguez, César; Arnedo Gil, Israel Upna; Calvo, César; Gómez Laso, Miguel Ángel Upna; He, Danping; Jiménez, Florentino; González Posadas, Vicente (Hindawi / Wiley, 2018)   Artículo / Artikulua  OpenAccess
    Passenger trains and especially metro trains have been identified as one of the key scenarios for 5G deployments. The wireless channel inside a train car is reported in the frequency range between 26.5GHz and 40GHz. These ...
  • Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 2.5-5 THz band 

    Navarro Cía, Miguel Upna; Vitiello, Miriam S.; Bledt, Carlos M.; Melzer, Jeffrey E.; Harrington, James A.; Mitrofanov, Oleg (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
    A low-loss and low-dispersive optical-fiber-like hybrid HE11 mode is developed within a wide band in metallic hollow waveguides if their inner walls are coated with a thin dielectric layer. We investigate terahertz (THz) ...
  • Tunable electro-optic wavelength filter based on lossy-guided mode resonances 

    Corres Sanz, Jesús María Upna; Ascorbe Muruzabal, Joaquín Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
    In this work an optical fiber tunable filter based on lossy guided-mode resonances (LGMR) is proposed. It consists of a multilayer structure deposited onto the surface of a plastic cladding removed multimode fiber. The ...
  • High resolution polarization-independent highbirefringence fiber loop mirror sensor 

    Leandro González, Daniel Upna; Bravo Acha, Mikel Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
    In this work, two all polarization-maintaining (PM) highbirefringence (Hi-Bi) fiber loop mirrors (FLM) which are immune to external polarization perturbations are validated both theoretically and experimentally. Simplified ...

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