Fernando Nuño García

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In high-voltage dc power supplies (hundreds of kilovolts), avoiding the inductance in the output filter is an important asset. Thus, a capacitor as a unique component of that filter is preferable. On the other hand, a high-voltage step-up transformer shows a high capacitance in its secondary, which can be included in a resonant stage. Both capacitances,(More)
The use of the average-current-mode control in the recently introduced two-input buck postregulator is studied in this paper. Using this type of control, the attenuation of the input voltage ripple (100–120 Hz) increases in relation to the one obtained when a conventional voltage-mode control (with or without feedforward) is used and, therefore, lower bulk(More)
This paper presents a novel system that allows elevating large structures by using a set of lifting towers that, adequately controlled with a synchronized operation, succeed in pulling the spatial mesh up to the height where it should stay. By doing so, the mounting of the spatial mesh can be carried out on the ground in an easier and, most important of(More)
With photovoltaic (PV) systems proliferating in the last few years due to the high prices of fossil fuels and pollution issues, among others, it is extremely important to monitor the efficiency of these plants and optimize the energy production process. This will also result in improvements related to the maintenance and security of the installation. In(More)
This paper uses a previously developed model of the heat transfer fluid (HTF) system of a Parabolic Trough Collector (PTC) thermosolar Plant to optimize the control of the heating of the HTF when it passes through the rows of the collectors. Three control estrategies have been analyzed and compared to the PID currently used in this sort of plants.
The behaviour of the series parallel resonant converter, PRC-LCC, with a capacitor as output filter is analyzed when operating on the optimum switching line. A polynomial is deduced to quickly compute what switching frequency and duty cycle are necessary at the control to obtain the desired output voltage and power in the converter. This polynomial is so(More)