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This paper studies the limitations of the control strategy of a bidirectional one-leg converter able to move energy from a low-voltage DC bus to a battery bank or an ultra-capacitors bank and vice-versa. One of the goals of the work is to implement strategies which allows parallel operation of these modules without communication between them. The power converter was modeled in order to carry out a...
A low-cost 18W intelligent LED driver for energy savings is presented. The intelligent LED driver has a DALI interface that allows it to be included in an upper lighting smart grid. So, it must provide galvanic isolation. The proposed LED driver is based on a two stage scheme with 24V safety voltage. The first stage is based on a PFC Flyback converter operating in the boundary conduction mode, meeting...
The new electric car is a vehicle with special needs in all aspects. Tires are one of the most important, so from the Workroom on Renewable Energy a new granular composite for tires has designed. It is formed by a series of beach sand ground particles embedded in a matrix ground urethane rubber. The urethane rubber is a material that degrades early. It serves to give cohesion to the ground sand particles...
The purpose of this paper is think over lighting systems in the context of energy efficiency and incorporation of renewable energy sources and energy storage capabilities. In this new context Lighting Systems becomes a mixture of distributed load with regulation capability, a distributed energy generation system and, simultaneously, a distributed energy storage system. In the context of this cocktail...
The WRE is an offer for students projects (degree, master, pre-doc (PhD) or pos-doc), to be performed in a multidisciplinary context around Renewable Energy and Environmental Issues. WRE is running since 2010. WRE is based on a methodology of project-based learning (PBL) and seeks to promote teamwork, multidisciplinary, technical proficiency in English and promoting collaboration and business participation...
This paper presents a methodology to improve the line current THD of a distribution line configuration with multiple non-linear loads, by means of a simple algorithm based on sensing only the voltage at the Point of Common Coupling (PCC), thus avoiding the use of line current measurement.
In this paper a new technique to reduce the LED current ripple and storage capacitance in high power factor (PF) off-line LED power supplies is investigated. The proposed methodology is based on the use of integrated power converters (IPC) to implement the power supply. Thus, the first stage operates in discontinuous conduction mode (DCM) to provide high PF. The second stage can be operated in either...
Due to the high rise in luminous efficiency that high-brightness light-emitting diodes (HB-LEDs) have experienced in recent years, many new applications have been researched. This paper covers a streetlight LED application using the offline integrated buck-flyback converter (IBFC) developed in previous works. In this application, the converter is used to provide power-factor correction from a universal...
In this work, an interleaved inverter with peak current control is investigated to supply low wattage metal halide lamps. The proposed topology provides a low frequency square current waveform that theoretically has no high frequency ripple, thus allowing acoustic resonances free operation of these lamps. The series igniter stage equivalent is chosen so that its effect is neglected. The operation...
This paper presents an off-line integrated full ballast to supply a 35W assembly of Power LEDs. The proposed solution is based in an input PFC stage and a DC to DC converter which provides a constant current through the assembly independently from the DC link voltage. The full ballast has full dimming capability, and all the analysis and design steps are presented, thus guaranteeing the fulfilling...
The working temperature of the electrodes of a fluorescent lamp is a critical issue not only during the ignition process but during operation at steady state. To keep the hot spot temperature close to its optimum value during the operation at reduced power levels, an additional heating current must be supplied to the electrodes. The SoS lines described in IEC60901 standard provides a straightforward...
This work proposes a new interleaved converter to supply Power LEDs. As an interleaved scheme, the converter provides a very low output current ripple, which makes it suitable for this application. The low inductor values used in the device allow the ability of attaining PWM dimming of the Power LEDs at high frequencies (20 kHz and higher). The main operation concept is explained, and a full design...
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