A5029034818- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Silicon Carbide Semiconductor Technologies
- Wireless Power Transfer Systems
- Advanced Battery Technologies Research
- Microgrid Control and Optimization
- Electromagnetic Compatibility and Noise Suppression
- Induction Heating and Inverter Technology
- Advanced Power Amplifier Design
- GaN-based semiconductor devices and materials
- Optical Wireless Communication Technologies
- Low-power high-performance VLSI design
- Analog and Mixed-Signal Circuit Design
- solar cell performance optimization
- Semiconductor Lasers and Optical Devices
- Radio Frequency Integrated Circuit Design
- Advancements in Semiconductor Devices and Circuit Design
- Power Quality and Harmonics
- Semiconductor materials and devices
- Electrostatic Discharge in Electronics
- Photovoltaic System Optimization Techniques
- High voltage insulation and dielectric phenomena
- Magnetic Properties and Applications
- Power Line Communications and Noise
- Energy Harvesting in Wireless Networks
Universidad de Oviedo
2016-2025
University Hospital Heidelberg
2024
Heidelberg University
2024
Universitas Gadjah Mada
2022
Control Systems Research (United States)
2012
Intel (United States)
2003-2009
Colciencias
2008
Universidad Politécnica de Madrid
1995-2005
Comunidad de Madrid
2005
A 45 nm logic technology is described that for the first time incorporates high-k + metal gate transistors in a high volume manufacturing process. The feature 1.0 EOT dielectric, dual band edge workfunction gates and third generation strained silicon, resulting highest drive currents yet reported NMOS PMOS. also features trench contact based local routing, 9 layers of copper interconnect with low-k ILD, low cost 193 dry patterning, 100% Pb-free packaging. Process yield, performance...
This paper addresses the performance of bidirectional dual active bridge (DAB) converter. One advantages DAB is possibility to achieve zero-voltage switching (ZVS) operation in all switches this However, ZVS range can be lost for light loads, especially if high voltage required at least one ports and phase-shift control used regulate power processed by Theoretically simple averaged small-signal models are presented Using study paper, boundaries easily evaluated. The proposed analysis allow...
The increase demand of an intermediate storage electrical energy in battery systems, particular due to the use renewable energy, has resulted need bidirectional DC/DC power converters with galvanic isolation. Uninterruptible Power Supplies (UPS), charging photovoltaic equipment and auxiliary supplies traction applications are examples some fields application this kind converters. A Dual Active Bridge (DAB) converter is a topology advantages decreased number devices, soft-switching...
A 65nm generation logic technology with 1.2nm physical gate oxide, 35nm length, enhanced channel strain, NiSi, 8 layers of Cu interconnect, and low-k ILD for dense high performance is presented. Transistor length scaled down to while not scaling the oxide as a means improve reduce power. Increased NMOS PMOS drive currents are achieved by strain junction engineering. 193nm lithography along APSM mask used on critical provide aggressive design rules 6-T SRAM cell size 0.57/spl mu/m/sup 2/....
A 32 nm generation logic technology is described incorporating 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> -generation high-k + metal-gate technology, 193 immersion lithography for critical patterning layers, and enhanced channel strain techniques. The transistors feature 9 Aring EOT gate dielectric, dual band-edge workfunction metal gates, 4 xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> strained silicon, resulting in the...
A 32 nm logic technology for high performance microprocessors is described. 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> generation high-k + metal gate transistors provide record drive currents at the tightest pitch reported any or 28 technology. NMOS are 1.62 mA/um Idsat and 0.231 Idlin 1.0 V 100 nA/um I <sub xmlns:xlink="http://www.w3.org/1999/xlink">off</sub> . PMOS 1.37 0.240 The impact of SRAM cell array size on Vccmin reported.
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The piecewise linear model has traditionally been used to calculate switching losses in mode power supplies due its simplicity and good performance. However, the use of latest low voltage MOSFET generations continuously increasing range frequencies have made it necessary review this account for parasitic inductances that does not include. This paper presents a complete analytical loss MOSFETs...
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...
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...
SEPIC and Cuk converters present a great advantage over boost fly-back topologies in discontinuous conduction mode (DCM): an input current with low harmonic content can be obtained by correctly choosing the inductors L/sub 1/ 2/ of converter fixed operation frequency, as is demonstrated here. The authors also discuss intermedium capacitor C/sub well some advantages disadvantages application. Simulation experimental results support approach. It concluded that DCM seem to good choices for use...
The determination of the boundaries between both modes conduction (continuous and discontinuous) in PWM DC-to-DC switching power converters used as factor preregulators (PFP) is presented this paper. When a converter works preregulator, its operating point constantly changing due to fact that DC voltage conversion ratio load "seen" by are each half-sinusoid line (input converter). In these conditions, mode cannot be directly determined. paper, angle half-sinusoidal input have been conditions...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents a new control strategy for power factor correctors (PFCs) that are used to drive high-brightness LEDs. is extremely simple and based on the use of conventional peak-current-mode controller with suitable selection compensation ramp waveform. Neither an analog multiplier nor input voltage sensor needed achieve quasi-sinusoidal line waveforms at nominal conditions full load. If...
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...
The single-ended primary inductance converter (SEPIC) presents several advantages over boost and flyback topologies which make this convenient for use as a power factor preregulator (PFP). Due to fact, both the pulsewidth modulation (PWM) zero-current switched quasi-resonant (ZCS-QR) SEPIC used PFPs are studied. Stress in components operation continuous discontinuous conduction mode considered PWM case, while of full-wave half-wave resonant switches is ZCS-QR case. study PFP reveals that...
Wireless communication transmitters have very low efficiencies due to the use of linear radiofrequency power amplifiers. Several techniques been proposed over years improve efficiency these systems. One most promising is called envelope tracking technique, which based on using a fast switching mode supply provide varying voltage amplifier that tracks transmitted signal. The can, thus, operate continuously near its theoretical maximum efficiency, greatly improving overall system. This paper...
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...
A new input current shaper is proposed in this paper. The operating principle based on the connection of a voltage source and loss-free resistor (LFR) between rectifier bulk capacitor conventional switching-mode power supply with no factor correction. Both LFR are obtained as an additional output from converter's transformer. This forward-type scheme one extra inductor. With final topology, good tradeoff voltage, re-cycling energy harmonic content can be established order to comply IEC...
The main objective of this paper is to summarize the state art power factor correction in off-line supply systems. study only focused on equipment fed from a single-phase line and it covers theoretical aspects, control strategies, topologies future trends. authors cover AC-DC converters, DC-DC converters resistor emulators, multiplier approach control, average current mode variable hysteresis one- several-switch topologies, soft switching.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A three-phase power factor preregulator with input inductor, diode bridge, and a single switch is analyzed. Operation discontinuous current variable switching frequency considered. Equations for average are presented, showing that quasi-sinusoidal waveforms obtained. Also, the equation shows an almost constant operation. design procedure where simulation practical results show good performance of approach. Comparison operation also better harmonic distortion obtained if voltage in (with off)...