Recursos de colección

Archivo Digital UPM (107.543 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Electrónica

Mostrando recursos 1 - 20 de 1.051

  1. Integración del laboratorio remoto eLab3D en títulos de grado de Ingeniería

    López Gregorio, Sergio; Carpeño Ruiz, Antonio; Arriaga García de Andoain, Jesús María
    La evolución de los laboratorios remotos ha sufrido un punto de inflexión al incorporarse en su diseño tecnologías basadas en entornos virtuales de aprendizaje. Los nuevos laboratorios remotos que han surgido ofrecen prestaciones educativas que permiten la adquisición de competencias prácticas similares a las que se alcanzan en los laboratorios presenciales. Este trabajo ofrece una aportación orientada a demostrar que es factible integrar el uso de estos nuevos recursos en los estudios de grado del área de la ingeniería electrónica. Se ha utilizado el laboratorio remoto eLab3D que permite realizar experimentos reales en el ámbito de la electrónica utilizando Internet....

  2. A New Switching Impulse Generator Based on Transformer Boosting and Insulated Gate Bipolar Transistor Trigger Control

    Ren, Ming; Zhang, Chongxing; Dong, Ming; Ye, Rixin; Albarracin Sanchez, Ricardo
    To make the switching impulse (SI) generator more compact, portable and feasible in field tests, a new approach based on transformer boosting was developed. To address problems such as triggering synchronization and electromagnetic interference involved with the traditional spark gap, an insulated gate bipolar transistor (IGBT) module with drive circuit was employed as the impulse trigger. An optimization design for the component parameters of the primary winding side of the transformer was realized by numerical calculation and error correction. Experiment showed that the waveform parameters of SI and oscillating switching impulse (OSI) voltages generated by the new generator were consistent...

  3. High-power UV-LED degradation: Continuous and cycled working condition influence

    Arques Orobón, Francisco José; Núñez Mendoza, Neftalí; Vázquez López, Manuel; González Posadas, Vicente; Segura Antunez, C.
    High-power (HP) UV-LEDs can replace UV lamps for real-time fluoro-sensing applications by allowing portable and autonomous systems. However, HP UV-LEDs are not a mature technology, and there are still open issues regarding their performance evolution over time. This paper presents a reliability study of 3W UV-LEDs, with special focus on LED degradation for two working conditions: continuous and cycled (30 s ON and 30 s OFF). Accelerated life tests are developed to evaluate the influence of temperature and electrical working conditions in high-power LEDs degradation, being the predominant failure mechanism the degradation of the package. An analysis that includes dynamic thermal...

  4. Shape memory alloy-based high phase order motor

    Rossi, Claudio; Yuan, Zongjian; Zhang, Chao; Barrientos Cruz, Antonio; Coral Cuellar, William
    In this paper, we present our current work in the design and characterisation of a new shape memory alloy (SMA)-based High Phase Order Motor (HPOM). The motor can be used either in stepping mode or in servo mode of operation. Each phase of the motor consists of an SMA wire with a spring. The principle of operation of the HPOM is presented. In its operation the motor resembles a stepper motor though the actuation principles are different and hence has been characterised similar to a stepper motor.This motor can be actuated in either direction depending on which SMA is actuated,...

  5. Virtual-work-based optimization design on compliant transmission mechanism for flapping-wing aerial vehicles

    Zhang, Chao; Rossi, Claudio; He, Wei; Colorado Montaño, Julián
    This paper presents a method for analyzing and optimizing the design of a compliant transmission mechanism for a flapping-wing aerial vehicle. Its purpose is of minimizing the peak input torque required from a driving motor. In order to maintain the stability of flight, minimizing the peak input torque is necessary. To this purpose, first, a pseudo-rigid-body model was built and a kinematic analysis of the model was carried out. Next, the aerodynamic torque generated by flapping wings was calculated. Then, the input torque required to keep the flight of the vehicle was solved by using the principle of virtual work....

  6. Identifying ground-robot impedance to improve terrain adaptability in running robots

    Arévalo Martín, Juan Carlos; Sanz Merodio, Daniel; Cestari Soto, Manuel; García Armada, Elena
    To date, running robots are still outperformed by animals, but their dynamic behaviour can be described by the same model. This coincidence means that biomechanical studies can reveal much about the adaptability and energy efficiency of walking mechanisms. In particular, animals adjust their leg stiffness to negotiate terrains with different stiffnesses to keep the total leg-ground stiffness constant. In this work, we aim to provide one method to identify ground-robot impedance so that control can be applied to emulate the aforementioned animal behaviour. Experimental results of the method are presented, showing well-differentiated estimations on four different types of terrain. Additionally,...

  7. v1 concept: designing a voltage mode control as current mode with near time-optimal response for Buck-type converters

    Cortés González, Jorge; Svikovic, Vladimir; Alou Cervera, Pedro; Oliver Ramírez, Jesús Angel; Cobos Marquez, Jose Antonio
    This article introduces the v1 concept, that explains how by only measuring the output voltage, designers have information about almost every signal of the power stage. Following the v1 concept, it is explained how to design a traditional type-III voltage mode control to behave like a current mode control with near time-optimal response under load transients. The work is validated in simulations and experimentally on a 300kHz Buck converter.

  8. Fuente de corriente alterna controlable entre 1 Hz y 50 kHz para aplicaciones de congelación magnética: diseño e implementación de la etapa de potencia

    Fuente Taravillo, Guillermo
    El propósito de este Trabajo Fin de Grado es diseñar un dispositivo capaz de suministrar una intensidad de corriente senoidal a una carga inductiva con el fin de generar un campo magnético en su interior. El dispositivo en cuestión es un convertidor de tensión continua a alterna (CC-CA), también conocido corno inversor electrónico. El campo magnético generado servirá en un futuro para investigar la influencia de este en el proceso de congelación de matrices alimentarias y otros tejidos. El interés en estas investigaciones nace en el ICTAN (Instituto de Ciencia y Tecnología de Alimentos y Nutrición), centro perteneciente al CSIC, en...

  9. Relative fascicle excursion effects on dynamic strength generation during gait in children with cerebral palsy

    Martín Lorenzo, Teresa; Lerma Lara, Sergio; Martínez Caballero, Ignacio; Rocón de Lima, Eduardo
    Evaluation of muscle structure gives us a better understanding of how muscles contribute to force generation which is significantly altered in children with cerebral palsy (CP). While most muscle structure parameters have shown to be significantly correlated to different expressions of strength development in children with CP and typically developing (TD) children, conflicting results are found for muscle fascicle length. Muscle fascicle length determines muscle excursion and velocity, and contrary to what might be expected, correlations of fascicle length to rate of force development have not been found for children with CP. The lack of correlation between muscle fascicle length...

  10. Influence of common synaptic input to motor neurons on the neural drive to muscle in essential tremor

    Gallego Juárez, Juan Antonio; Dideriksen, Jacob L.; Holobar, Ales; Ibañez Pereda, Jaime; Pons Rovira, José Luis; Louis, Elan D.; Rocón de Lima, Eduardo; Farina, Darío
    Tremor in essential tremor (ET) is generated by pathological oscillations at 4 to 12 Hz, likely originating at cerebello-thalamo-cortical pathways. However, the way in which tremor is represented in the output of the spinal cord circuitries is largely unknown because of the difficulties in identifying the behavior of individual motor units from tremulous muscles. By using novel methods for the decomposition of multichannel surface EMG, we provide a systematic analysis of the discharge properties of motor units in 9 ET patients, with concurrent recordings of EEG activity. This analysis allowed inferring the contribution of common synaptic inputs to motor neurons...

  11. One central oscillatory drive is compatible with experimental motor unit behaviour in essential and Parkinsonian tremor

    Dideriksen, Jacob L.; Gallego Juárez, Juan Antonio; Holobar, Ales; Rocón de Lima, Eduardo; Pons Rovira, José Luis; Farina, Darío
    Pathological tremors are symptomatic to several neurological disorders that are difficult to differentiate and the way by which central oscillatory networks entrain tremorogenic contractions is unknown. We considered the alternative hypotheses that tremor arises from one oscillator (at the tremor frequency) or, as suggested by recent findings from the superimposition of two separate inputs (at the tremor frequency and twice that frequency). Approach. Assuming one central oscillatory network we estimated analytically the relative amplitude of the harmonics of the tremor frequency in the motor neuron output for different temporal behaviors of the oscillator. Next, we analyzed the bias in the...

  12. Artificial cognitive control with self-x capabilities: A case study of a micro-manufacturing process

    Haber Guerra, Rodolfo E.; Juanes Rodríguez, Carmelo; Toro Matamoros, Raúl Mario del; Beruvides López, Gerardo
    Nowadays, even though cognitive control architectures form an important area of research, there are many constraints on the broad application of cognitive control at an industrial level and very few systematic approaches truly inspired by biological processes, from the perspective of control engineering. Thus, our main purpose here is the emulation of human socio-cognitive skills, so as to approach control engineering problems in an effective way at an industrial level. The artificial cognitive control architecture that we propose, based on the shared circuits model of socio-cognitive skills, seeks to overcome limitations from the perspectives of computer science, neuroscience and systems...

  13. Performance evaluation of an AODV-based routing protocol implementation by using a novel in-field WSN diagnosis tool

    Mujica Rojas, Gabriel Noe; Portilla Berrueco, Jorge; Riesgo Alcaide, Teresa
    The Wireless Sensor Network research field has been growing and becoming more mature during the last decade since novel technologies and research lines have emerged targeting its usability under different real scenarios. One of the key topics to assure the efficiency and effectiveness of these technologies in final applications is the quality of the service and the reliability of the whole system, which strongly depends on the communication/topology capabilities as well as routing strategies within the WSN. In this context, it is essential to evaluate the implementation of routing algorithms and network connectivity in actual deployments, as a support to...

  14. Multiphase current-controlled buck converter with energy recycling output impedance correction circuit (OICC)

    Svikovic, Vladimir; Cortés González, Jorge; Alou Cervera, Pedro; Oliver Ramírez, Jesús Angel; García Suárez, Oscar; Cobos Márquez, José Antonio
    This study is related to the improvement of the output impedance of a multiphase buck converter with peak current mode control (PCMC) by means of introducing an additional power path, which virtually increases the output capacitance during transients. Various solutions that can be employed to improve the dynamic behavior of the converter system exist, but nearly all solutions are developed for a single-phase buck converter with voltage mode control, while in the voltage regulation module applications, due to the high currents and dynamic specifications, the system is usually implemented as a multiphase buck converter with current mode control to ensure...

  15. Impact of the control on the size of the output capacitor in the integration of Buck converters

    Cortés González, Jorge; Svikovic, Vladimir; Alou Cervera, Pedro; Oliver Ramírez, Jesús Angel; Cobos Marquez, Jose Antonio
    One of the main challenges in PowerSoC converters is the integration of the output capacitor. In some applications, the minimum value of the capacitance is constrained not by the maximum allowed voltage ripple but by dynamic requirements. This paper investigates for a 10 MHz Buck converter if the design of very fast controls can reduce the required output capacitor and which controls are more suitable. It is also analyzed the effect that the moment in which the load transient can occur has on the reduction of the size of the output capacitor.

  16. Performance metrics for small-signal stability assessment of DC-distributed power-system-architecture comparisons

    Vesti, Sanna Kaarina; Oliver Ramírez, Jesús Angel; Prieto López, Roberto; Cobos Márquez, José Antonio; Suntio, T.
    The objective of this paper is to provide performance metrics for small-signal stability assessment of a given system architecture. The stability margins are stated utilizing a concept of maximum peak criteria (MPC) derived from the behavior of an impedance-based sensitivity function. For each minor-loop gain defined at every system interface, a single number to state the robustness of stability is provided based on the computed maximum value of the corresponding sensitivity function. In order to compare various power-architecture solutions in terms of stability, a parameter providing an overall measure of the whole system stability is required. The selected figure of...

  17. Simple analytical approach for the calculation of winding resistance in gapped magnetic components

    Holguín Reynoso, Fermín Antonio; Asensi Orosa, Rafael; Prieto López, Roberto; Cobos Márquez, José Antonio
    The Dowell expression is the most commonly used method for the analytic calculation of the equivalent resistance in windings of magnetic components. Although this method represents a fast and useful tool to calculate the equivalent resistance of windings, it cannot be applied to components that do not fit with classical 1D assumption, which is the case of gapped magnetic components. These structures can be accurately analyzed using finite-element analysis (FEA) with the time cost that this represents. Modifying the Dowelĺs equation, and taking advantage of the orthogonality between skin and proximity effects, a simple solution that allows its application in...

  18. Power losses calculations in windings of gapped magnetic components

    Holguín Reynoso, Fermín Antonio; Prieto López, Roberto; Asensi Orosa, Rafael; Cobos Márquez, José Antonio
    A model is proposed for the calculation of the winding losses at the beginning of the design process of high frequency transformers and inductors. Although this kind of losses have been subject of investigation for years, their analytical calculation in gapped components is still limited, and the use of numerical analysis tools, such as finite elements analysis (FEA) tools, are commonly needed for winding characterization. A general 2-D equivalent analytical model for windings losses calculation in gapped magnetic components that shows very good results compared with FEA calculation is presented. The model can be integrated in design and optimization tools...

  19. Power distribution in a 13 kW three-phase rectifier system: impact on weight, volume and efficiency

    Molina García, José María; Zhao, Sisi; Silva, M.; Oliver Ramírez, Jesús Angel; Alou Cervera, Pedro; Torres, J.; Arévalo, F.; García, O.; Cobos Márquez, José Antonio
    This paper addresses the power delivery strategy on an aircraft application consisting on seven isolated DC loads to be supplied from the AC grid. Distributed or centralized power processing is evaluated taking into account weight and efficiency. Additionally, the rectifier switching frequency has to be synchronized with an external frequency clock to minimize the interference of the converter harmonics with the loads.

  20. Physical modeling and optimization of a GaN HEMT design with a field plate structure for high frequency application

    Cucak, Dejana; Vasic, Miroslav; García, Oscar; Bouvier, Yann; Oliver Ramírez, Jesús Angel; Alou Cervera, Pedro; Cobos Márquez, José Antonio; Wang, Ashu; Martin Horcajo, Sara; Romero Rojo, Fátima; Calle Gómez, Fernando
    Abstract: In this paper, physical modeling of a GaN HEMT with a field plate structure is proposed, with the objective of providing the connection between the physical design parameters of the device (geometry, Al mole fraction, type of the field plate, etc) and on-resistance together with parasitic capacitances of the device. In this way, it is possible to optimize the design of a switching device for a particular application, which in our case is a high frequency DC DC converter for Envelope Tracking and Envelope Elimination and Restoration techniques. In this work, extrinsic models for output characteristics together with input, output...

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