A5007129743- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Advanced Battery Technologies Research
- Wireless Power Transfer Systems
- GaN-based semiconductor devices and materials
- Analog and Mixed-Signal Circuit Design
- Electromagnetic Compatibility and Noise Suppression
- Advancements in Semiconductor Devices and Circuit Design
- Experimental Learning in Engineering
- Optical Wireless Communication Technologies
- Semiconductor Lasers and Optical Devices
- HVDC Systems and Fault Protection
- Semiconductor materials and devices
- Radiation Effects in Electronics
- Viral Infectious Diseases and Gene Expression in Insects
- Low-power high-performance VLSI design
- E-Learning and Knowledge Management
- Electromagnetic Compatibility and Measurements
- Problem and Project Based Learning
- Refrigeration and Air Conditioning Technologies
- Electrostatic Discharge in Electronics
- Photovoltaic System Optimization Techniques
- Industrial Automation and Control Systems
Universidad de Oviedo
2016-2025
Instituto Universitario Italiano de Rosario
2025
University of Cuenca
2025
University of Basrah
2024
University of Chile
2001-2016
Alstom (Switzerland)
2014
Control Systems Research (United States)
2012
Center of Molecular Immunology (Cuba)
1997-2010
Cranfield University
2009-2010
Colciencias
2008
High-brightness LEDs are considered remarkable lighting devices due to their high reliability, chromatic variety, and increasing efficiency. As a result, number of solutions for supplying LED strings emerging. One-stage cost-effective, but efficiency is low because they have fulfill several purposes with only one converter: power factor correction (PFC), galvanic isolation (in some cases), current regulation. Two-stage three-stage higher each stage optimized or two tasks the preferred...
This article analyzes two modular power converter concepts, cascaded H-bridges (CHB) and multilevel (MMC) topologies, with special attention to the latter design. Both concepts have some characteristics in common can provide required functionalities for electronic transformers (PETs). analysis will cover aspects like number of cells, devices, functionalities, potential uses.
High-brightness light-emitting diodes (LEDs) are considered as a remarkable lighting device due to their high reliability, chromatic variety, and increasing efficiency. As consequence, number of solutions for supplying LED strings coming out. One-stage cost effective, but efficiency is low they have fulfill several purposes with only one converter: power factor correction (PFC), galvanic isolation (in some cases), current regulation. Two-stage three-stage higher each stage optimized just or...
AbstractHigh-Brightness Light Emitting Diodes (HB-LEDs) are considered the future trend in lighting not only due to their high efficiency and reliability, but also other outstanding characteristics: chromatic variety, shock vibration resistance, etc. Nevertheless, they need development of new power supplies especially designed for boosting taking advantage aforementioned characteristics. Besides, behaviour is completely different from rest devices and, consequently, it should be taken into...
Active power-factor correctors (PFCs) are needed to design ac-dc power supplies with universal input voltage range and sinusoidal current. The classical method control PFCs consists in two feedback loops an analog multiplier. Hence, the current is it in-phase voltage. However, a bulk capacitor balance output power. Due its high capacitance, electrolytic traditionally used as PFCs. As consequence, lifetime of supply limited by capacitor's, which becomes insufficient some applications (e.g.,...
Due to their high reliability and luminous efficacy, high-brightness light-emitting diodes are being widely used in lighting applications, therefore, power supplies required have also efficiency. A very common approach for achieving this ac-dc applications is using a two-stage topology. The factor corrector boost converter operating the boundary conduction mode as first stage. It normally designed without electrolytic capacitors, improving but increasing low-frequency ripple of output...
This paper presents a new control strategy for power factor correctors (PFCs) used to drive high-brightness light-emitting diodes (HB-LEDs). is extremely simple and based on the use of standard peak-current-mode integrated controllers (PCMICs), reducing its cost complexity in comparison traditional PFC controllers. In fact, this method an alternative implementation one-cycle PFCs belonging flyback family converters, without introducing high total harmonic distortion. case, exponential...
This paper presents the introduction of problem-based learning (PBL) in a power electronics course at University Oviedo, Gijón, Spain, by means two practical projects: design and construction switching-mode supply (SMPS) prototype static study dc-dc converter topology. The goal this innovation was for students to apply practice knowledge they had acquired theory classes. PBL is known be motivating, problem-centered teaching method that brings real professional world closer student....
High-brightness light-emitting diodes (HB-LEDs) are recognized as being potential successors of incandescent bulb lamps due to their high luminous efficiency and long lifespan. To achieve these advantages, HB-LED ballast must be durable efficient. Furthermore, for this specific application, ac-dc requires a high-step-down ratio, power factor low cost. This paper presents tapped-inductor buck corrector (PFC) operating in boundary conduction mode design replacing lamps. low-cost solution...
The use of battery-cell equalizers is mandatory in order to assure that all the cells connected series are charged its maximum capacity, even when they present small differences this parameter due several factors, such as aging, manufacturing, or temperature. Active equalizers, with a higher efficiency comparison passive ones, have disadvantage using considerable number components. Moreover, case active very high performance, can be higher. In paper, wave-trap concept, widely used...
In this article, a condition monitoring system for the degradation assessment of power semiconductor modules under switching conditions is presented. The proposed based on online measurement two damage indicators: <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> -state voltage and drop in bond wires. on-state can be employed temperature estimation, order to anticipate failures solder joints that increase thermal resistance cooling path....
Low cost passive power factor correction (PFC) and single-stage PFC converters cannot draw a sinusoidal input current are only suitable solutions to supply low levels. preregulators based on the use of multiplier solve such drawbacks, but second stage dc-dc converter is needed obtain fast output voltage dynamics. The response can be improved by increasing corner frequency feedback loop. main drawback obtaining faster distortion current. This paper describes simple control strategy Based...
Silicon Carbide (SiC) devices are becoming increasingly available in the market due to mature stage of development fact their manufacturing process. Their numerous advantages compared silicon (Si) devices, such as, for example, higher blocking capability, lower conduction voltage drop, and faster transitions make them more suitable high-power high-frequency converters. The aim this paper is study switching behavior two most-widely studied configurations SiC literature: normally-on JFET...
The Modular Multilevel Converter (MMC) is a type of DC-AC electronic power converter suitable for HVDC applications, thanks to its modularity and the symmetrical design cells. Cells in conventional MMCs use capacitor DC link, meaning that net balance cell needs be equal zero. It possible however modify cells MMC provide capability transfer (inject or drain) power. such opens several new functionalities uses MMC. with can used connect medium/high voltage AC ports intrinsic MMC, low DC/AC...
One of the requirements that electronics circuits must satisfy comprises conducted and irradiated noise specifications. Whereas is well covered in literature, radiated not. Radiated regulations impose limits on measured 3 or 10 m away from electronic equipment. These measurements are usually made anechoic rooms, which very expensive. Moreover, measurement procedure not a ldquoplug-and-playrdquo feature, but requires strict measuring protocol. Once circuit has been tested, designer remains...
This paper discusses the energization and start-up process of modular three-stage solid-state transformers (SSTs) based on a cascaded H-bridge topology. A key element SST is auxiliary power supply (APS) feeding circuitry. Redundancy simpler implementation can be achieved by powering APSs from dc-link capacitors cells, but at expense more challenging SST. The first step this must performed before are operative. result in undesired transient events (inrush currents, voltage sags voltages,...
There are several possibilities to transfer the energy taken from a photovoltaic cell grid. In past, modules used same centralized inverter Nowadays, decentralized preferred because of their versatility harvest larger amount power, even when some total surface covered and do not receive solar irradiation. This paper presents an topology that can be connect module directly The is based on single stage Flyback it quite simple. Furthermore, maximum power point tracking algorithm proposed....
There are three types of static uninterruptible power supplies (UPSs): passive standby, line interactive, and double conversion. The last one protects the load against all disturbances, but it is most expensive with lowest efficiency. On other hand, passive-standby line-interactive UPSs have higher efficiency lower cost, they show an important drawback: a switching time from normal to stored-energy mode. As consequence, there notch in UPS output voltage during this time. In previous paper,...
This paper proposes a Flyback-based Input-Series Output-Parallel (ISOP) Auxiliary Power Supply (APS), intended to feed the control system of cells Solid-State Transformer (SST). The SST topology is based on modular Multiport Multilevel Converter (MMC). Energization auxiliary circuitry not trivial due high voltages involved (tens kV for electric power distribution system), most commercially available and driving being usable isolation requirements. It possible energize from an APS, connected...
The Asymmetrical Half Bridge (AHB) converter has been deeply analysed as second stage in acdc LED drivers.Galvanic isolation, high reliability and efficiency are their main advantages while a limited duty cycle range (i.e., 0-0.5) poor dynamic behaviour disadvantages.As of an driver, the most demanding requirement for its control loop is cancelling low-frequency ripple introduced by first stage.According to maximum attainable bandwidth, this normally achieved implementing feedforward...