José Fernández-Ramos

University of Malaga | UMA · Department of Electronics

This paper proposes a new automatic tuning method for the proportional-integral (PI) controllers of photovoltaic irrigation systems (PVIS) without the need for any other power source or batteries. It enables the optimisation of the values of the PI parameters (Kp and Ki) automatically, eliminating the requirement for skilled personnel during the in...

This article deals with the development of a simulation tool for evaluating the energy consumption of an electric racing vehicle. The tool was carried out in the Matlab/Simulink environment and is based on the equations that govern the dynamics of the vehicle. All the systems of an electric vehicle were modelled: motor, battery, controller, bodywor...

One of the greatest challenges in stand-alone photovoltaic irrigation systems (PVIS) without batteries is the tuning of PID controllers and the evaluation of their performance once the system is tuned. Tuning method must be applied in clear days (constant irradiance) while performance must be evaluated in the most unfavourable circumstances, which...

This article presents a project for the design, manufacture and evaluation of a light electric vehicle prototype whose only source of energy comes from a photovoltaic generator integrated in it, that is, it does not have batteries for energy storage. In its approach and development, a project-based learning model (PBL) has been followed, for which...

Stand-alone large-power PV irrigation systems without batteries is a recent innovation. This means that their design has not yet reached maturity and there are no experimental data about their performance available. This paper is a contribution, on the one hand, to the systematic tuning of the control of this type of systems and, on the other hand,...

In this work, a systematic study of different tuning rules of proportional-integral (PI) control parameters applied to Photovoltaic Irrigation Systems (PVIS) based on Standard Frequency Converters (SFCs) has been carried out. A laboratory system has been implemented to obtain the PI control parameters by means of the most widely accepted tuning rul...

This article presents a design and performance analysis of an Electronic Differential (ED) system designed for Light Electric Vehicles (LEVs). We have developed a test tricycle vehicle with one front steering wheel and two rear fixed units in the same axis with a brushless DC (BLDC) motor integrated in each of them. Each motor has an independent co...

The current state of the art of photovoltaic (PV) irrigation systems is limited to PV peak powers below 40 kWp, which does not cover the irrigation needs of farmers, co-operatives, irrigator communities, and agro-industries. This limitation of power is due to two main technical barriers: The quick intermittence of PV power due to the passing of clo...

The adaptation of the mature PV water-pumping technology to large power irrigation applications requires the problems associated to PV power intermittencies and matching PV production with the irrigation needs to be resolved. This paper presents the innovations developed, implemented and tested in a PV irrigation prototype installed in a real well...

Large light-emitting diode (LED) displays have undergone a great deal of development in recent years. One of their main characteristics is their potential for great diversity in their physical parameters (size, brightness, power consumption, etc.) and in the configuration of the LED pixel arrays. The physical parameters can vary by several orders o...

In recent years, interest in light‐emitting diode (LED) lighting has been growing because of its high efficacy, lifetime and ruggedness. This paper proposes a better adaptation of LED lamps to the technical requirements of photovoltaic lighting domestic systems, whose main quality criteria are reliability and that behave as voltage power supplies....

The expected labor of modern engineering schools is the creation of fully trained professionals. With a new electronic teaching methodology we wish to transmit to the students how the constraints on the work of an engineer are linked to design but also to the development and manufacturing process of any electronic equipment. This teaching methodolo...

Prótesis auditiva de oído medio que comprende un transductor microeléctrico mecánico y un tornillo, hueco y sellado, configurado para su inserción roscada en la ventana oval, y donde dicho tornillo comprende, a su vez, un anclaje configurado para fijar el transductor y transmitir la vibración generada por éste a la pared de la membrana basilar.

Light-emitting diode (LED) displays are currently experiencing a growing interest in many applications such as publicity, mass shows, etc., because of their high performance in terms of component reliability, brightness, power efficacy, modularity and scalability. However, the complexity of the control architecture of the present designs, based on...

Photovoltaic pumping systems (PVPS) based on standard frequency converters (SFCs) are currently experiencing a growing interest in pumping programmes implemented in remote areas because of their high performance in terms of component reliability, low cost, high power range and good availability of components virtually anywhere in the world. However...

A new electronic design for virtual matrix LED based screens is presented using D-Type Flip-Flops registers (HC logic) instead of constant current drivers. This design reduces in a significant way the cost and the complexity of the current large LEDs displays. It works as a write only memory on the basis: "it is seen what is saved". This design is...

In this paper a new threshold gate is proposed. Its main characteristics are high fan-in (128-inputs), low delay time (8.35 ns), low power consumption (W) and optimal implementation of any threshold function. The gate can evaluate multiple input vectors in the same evaluation phase with only one clock signal. Synchronous (pipe-line) and asynchronou...

We present a new theorem in Threshold Logic which is a generalization of Mezei's theorem. We demonstrate one of its applications, i.e., the optimization of the size of depth-2 Multioperand Binary Adders. By applying this theorem, the weight complexity of the gates in the second layer of a previous construction is reduced from O(m·2) to O(1), where...

Procedimiento de tratamiento de señales de audio de 32 bandas con compresión de amplitudes, del tipo de los que se utilizan para compensar la señal hablada a personas con pérdidas neurosensoriales con el objeto de aumentar su inteligibilidad, y procesador digital para la realización de dicho procedimiento, a utilizar preferentemente en la industria...

The central topic of this paper is the implementation of binary adders with threshold logic using a new methodology that introduces two innovations: the use of the input and output carries of each bit for obtaining all the sum bits and a modification of the classic carry lookahead adder technique that allows us to obtain the expressions of the gene...

We show a new time discrete transform that distributes the spectrum of input signal in a exponential-wise arrangement increasing low frecuencies resolution and decrreasing it for high frecuencies. This is very suitable for audio signal processing.

In this paper we present both a new design for a threshold logic gate, based on clocked cross-coupled inverters, and the way to optimize the implementation of threshold functions using this gate. The main characteristics of the threshold gate are low power consumption (it does not consume static power) and high speed.

This paper describes the design and evaluation of a circuit which performs the compression of narrow-band signals within a multiband analog system for a hearing aid. The system has twelve narrow-band modules. Each module is formed by four stages. The first stage is a band-pass filter which selects the bandwidth of the module. The second stage, the...

New implementation of Threshold Logic Gates are shown. The main characteristics of this gates are the input module that permits increase the numbers of inputs without to reduce throughput of the circuits.

Introduces a digital hearing aid that compensates the signal spoken in sensorineural impaired listeners with the object of improving their intelligibility. The technique used is based on a digital analysis/synthesis of speech; the authors divided the input signal into short time blocks then make a multiband analysis, nonlinear amplification and syn...

We present in this paper new types of digital comparator circuits based on clocked cross-coupled inverters. They are digital circuits but they are implemented with analogical techniques. Therefore they have different sizes. The circuits are fast and small compared with traditional implementations

A new architecture for the real-FFT (RFFT) calculation is introduced. This implementation reduces the computation time for the RFFT over other conventional implementations. In addition, the architecture is simple and permits a compact microelectronic design

New type of time multiplexion of switched capacitor filters for audio signal that reduces area and power consumption. The new technique is based on using diferent frecuencies for each of multiplexes filters.