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Dive into the research topics where E.L. Corominas is active.

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Featured researches published by E.L. Corominas.


IEEE Transactions on Industry Applications | 2005

Evaluation of a low-cost permanent emergency lighting system based on high-efficiency LEDs

M. Rico-Secades; A.J. Calleja; J. Ribas; E.L. Corominas; J. M. Alonso; J. Cardesin; J. Garcia-Garcia

Nowadays, Permanent Emergency Lighting Systems (PELSs) are widely used in many applications, including emergency exit indication and lighting in critical or strategic points. Limitation in operation hours in classical lamps (10 000-20 000 h for fluorescent lamps) implies short lamp replacement times and, therefore, high maintenance costs. This paper shows an alternative solution based on high-efficiency LEDs. The long operation life (above 100 000 h) of high-efficiency LEDs with a very simple electronics circuitry implies an interesting solution for these types of applications. A 30-lm and 1-h PELS has been built and tested. A low-cost power supply has been built and used as a battery charger and LED driver.


IEEE Transactions on Power Electronics | 2006

Low cost electronic ballast for a 36-W fluorescent lamp based on a current-mode-controlled boost inverter for a 120-V DC bus power distribution

M. Rico-Secades; E.L. Corominas; J. Garcia; J. Ribas; A.J. Calleja; J. Marcos Alonso; J. Cardesin

A non-resonant electronic ballast based on one power switch and on one reactive element-one inductance-is described in this paper. The special current mode control implementation provides an intrinsic short-circuit protection and a very simple control circuitry. Filament heating time, current during the heating period, and protection against broken tube can be easily implemented with the proposed circuitry. A greenhouse application with a 120-V dc bus power distribution is presented in this paper. The dc bus voltage is easily obtained (in this particular application) from a classical series-connected 12-pulse rectifier in combination with a transformer with two secondary windings (one in Wye connection and other one in Delta connection). An additional advantage of this configuration is the high power factor obtained at the input stage.


conference of the industrial electronics society | 2009

Electronic driver without electrolytic capacitor for dimming High Brightness LEDs

J. Garcia; A.J. Calleja; E.L. Corominas; D. Gacio; J. Ribas

This paper presents a full ballast for driving an assembly of High Brightness LEDs, based on a new dc to dc converter. The converter provides a constant current waveform to the load parting from a DC bus voltage. The converter, operating with a peak current control, keeps the current through the LEDs constant independently of the bus voltage. This is carried out internally by self-adjusting the switching frequency of the converter. Thus, the requirements of the capacitance of the bus capacitor are greatly diminished, allowing the avoidance of electrolytic technology. Also, low frequency PWM dimming can be carried out easily. The present work shows the design procedure and the experimental results obtained after building a prototype of a full ballast for HB LEDs.


IEEE Transactions on Power Electronics | 2004

Analysis and design of a novel single-stage high-power-factor electronic ballast based on integrated buck half-bridge resonant inverter

J.M. Alonso; A.J. Calleja; J. Ribas; E.L. Corominas; M. Rico-Secades

A novel single-stage high-power-factor electronic ballast obtained from the integration of a buck DC-to-DC converter and a half-bridge resonant inverter is analyzed in this paper. The buck converter is operated in discontinuous conduction mode and at constant frequency providing an input power factor high enough to satisfy present standard requirements. The operation of the proposed ballast is also investigated in detail in this paper, obtaining the important equations and characteristics in order to allow interested readers to perform an easy design. A ballast prototype supplying two 36 W fluorescent lamps has been both simulated and implemented at the laboratory. The results predict good market possibilities for the proposed topology in terms of reliability, cost, efficiency, and lamp life.


ieee industry applications society annual meeting | 2003

Evaluation of a low cost permanent emergency lighting system based on high efficiency LEDs

M. Rico-Secades; A.J. Calleja; J. Ribas; E.L. Corominas; J. M. Alonso; J. Cardesin; J. Garcia

Nowadays, permanent emergency lighting systems (PELS) are widely used in many applications: emergency exit indication, lighting in critical or strategic points. Limitation in operation hours in classical lamps (10000-20000 hours for fluorescent lamps) implies short lamp replacement times and, therefore, high maintenance costs. This paper shows an alternative solution based on high efficiency LEDs. The long operation life (above 100000 hours) of high efficiency LEDs with a very simple electronics circuitry implies an interesting solution for this type of application. A 30 lumens and 1 hour PELS has been built and tested. A low cost power supply has been built and used as battery charger and LED driver.


ieee industry applications society annual meeting | 1998

Design considerations for optimum ignition and dimming of fluorescent lamps using a resonant inverter operating open loop

J. Ribas; J. M. Alonso; E.L. Corominas; A.J. Calleja; M. Rico-Secades

The design of dimming electronic ballasts for fluorescent lamps has to be made taking into account that fluorescent lamp life is greatly affected by the starting scenario and by how the filament heating current is varied during dimming operation. Another important aspect is that the ballast should provide a wide stable control range of the output power, some applications require dimming down the output power to less than 20% of the nominal value. One of the most commonly used topologies for driving fluorescent lamps is the resonant half bridge inverter. In this topology, the starting scenario and the stable dimming range depends on both the control parameter selected and the control strategy used. This paper focuses on the LCC series-parallel resonant inverter. Different design and control methodologies are analyzed from the point of view of the starting scenario and the stable control range obtained. Generalized characteristics are obtained to simplify the design of the resonant tank, including operating points where the fundamental approach gives no accurate results. Finally, the theoretical and practical results obtained using the different control strategies are compared.


IEEE Transactions on Industrial Electronics | 2000

Development of a distributive control scheme for fluorescent lighting based on LonWorks technology

J.M. Alonso; J. Ribas; J.J.D. Coz; A.J. Calleja; E.L. Corominas; M. Rico-Secades

In this paper, a new distributive control system for indoor fluorescent lighting based on LonWorks technology is presented. The system features the following elements: microprocessor-controlled fluorescent lamp electronic ballast, communication system using the power line as communication media, and control software for Windows 95 environment. The electronic ballast has been especially designed to be operated under the proposed distributive control system. Thus, it features high-input power factor, high-frequency lamp supply, lamp power regulation against line voltage variations, dimming capability, and lamp failure detection. With this scheme, a low-cost distributive control system for lighting applications has been achieved, allowing energy and maintenance savings and increase in the reliability of the fluorescent lighting systems.


ieee industry applications society annual meeting | 2004

Driver for high efficiency LED based on flyback stage with current mode control for emergency lighting system

M. Rico-Secades; A.J. Calleja; J. Cardesin; J. Ribas; E.L. Corominas; J. M. Alonso; J. Garcia

Nowadays, permanent emergency lighting systems (PELS) are widely used in many applications: emergency exit indication, lighting in critical or strategic points. Limitation in operation hours in classical lamps (10.000-20.000 hours for fluorescent lamps) implies short lamp replacement times and, therefore, high maintenance costs. This paper shows a driver based on a flyback circuit for a PELS system. Control in current mode operation assure current constant in LEDs in any battery condition. The long operation life (above 100.000 hours) of high efficiency LEDs with a very simple electronics circuitry implies an interesting solution for this type of applications. A 30 lumens and 1 hour PELS has been built and tested.


IEEE Transactions on Industrial Electronics | 2001

Low-cost single-stage electronic ballast based on a self-oscillating resonant inverter integrated with a buck-boost PFC circuit

J. Ribas; J.M. Alonso; A.J. Calleja; E.L. Corominas; M. Rico-Secades; J. Cardesin

In this paper, a new solution to implement and control a single-stage electronic ballast based on the integration of a buck-boost power-factor-correction stage and a half-bridge resonant inverter is presented. The control signals are obtained from the inverter resonant current by means of a saturable transformer. Core saturation is used to control the required dead time between the control pulses of both switches. Since no special integrated circuits are required to control the ballast, the total number of components is minimized and the final cost of the ballast is reduced compared to a typical two-stage configuration. Analysis and basic design guidelines are presented in the paper, together with experimental results obtained from a laboratory prototype.


applied power electronics conference | 2000

Evaluation of a novel single-stage high-power-factor electronic ballast based on integrated buck half-bridge resonant inverter

J.M. Alonso; A.J. Calleja; J. Ribas; E.L. Corominas; M. Rico-Secades

A novel single-stage high-power-factor electronic ballast obtained from the integration of a buck DC-to-DC converter and a half-bridge resonant inverter is evaluated in this paper. The buck converter is operated in discontinuous conduction mode and at constant frequency providing an input power factor high enough to satisfy present standard requirements. The operation of the proposed ballast is also investigated in detail in this paper. A ballast prototype for two 36 W fluorescent lamps has been both simulated and implemented at the laboratory.

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J. Ribas

University of Oviedo

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D. Gacio

University of Oviedo

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