Dc Power Supply
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Vibration energy harvesting using piezoelectric transducer and non-controlled rectifiers circuits
Vibration energy harvesting with piezoelectric materials is of practical interest because of the demand for wireless sensing devices and low-power portable electronics without external power supply. For practical use of vibration energy harvester with piezoelectric materials, it is necessary to process the alternating current (AC) by using different rectifie
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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2. Desempenho de um painel fotovoltaico de baixa tensão, acoplado ao protótipo de um conversor dc/dc topologia Booster
Low voltage solar panels increase the reliability of solar panels due to reduction of in series associations the configurations of photovoltaic cells. The low voltage generation requires DCDC converters devices with high efficiency, enabling raise and regulate the output voltage. This study analyzes the performance of a photovoltaic panel of Solarex, MSX mod
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/06/2010
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3. An estimation method for gate delay variability in nanometer CMOS technology
In the nanoscale regime of VLSI technology, circuit performance is increasingly affected by variational effects such as process variations, power supply noise, coupling noise and temperature changes. Manufacturing variations may lead to significant discrepancies between designed and fabricated integrated circuits. Due to the shrinking of design dimensions, t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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4. ADVANCED USE OF THE EXCEEDING POWER PLANT CAPACITY OF HVDC TRANSMISSION SYSTEMS TO PRODUCE OXYGEN AND HYDROGEN / UTILIZAÇÃO AVANÇADA DA CAPACIDADE EXCEDENTE DE SISTEMAS DE TRANSMISSÃO CCAT PARA PRODUÇÃO DE OXIGÊNIO E HIDROGÊNIO
This PhD thesis discusses the use of the power plant capacity in HVDC transmission systems during inactive periods of the main converters to feed local loads, aiming at a better AC power quality and DC transmission. The power available in the inactive periods is drained by an auxiliary converter connected in parallel with the HVDC converter. This energy can
Publicado em: 2008
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5. Redução aluminotérmica do óxido de tântalo usando uma tocha de plasma como ignitor
In this work was used a plasma torch of non transferred arc with argon as work gas, using a power supply with maximum DC current of 250 A and voltage of 30 V to activate the plasma and keep it switched on. The flame temperature was characterized by optical emission spectroscopy, through Boltzmann-plot-method. The torch has been used like igniter in the alumi
Publicado em: 2007
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6. Desenvolvimento de conversor comutado em baixa frequencia para aplicação em sistemas de geração distribuida baseados em celulas a combustivel / Development of a low-frequency commutation converter for distributed generation system based on fuel cells
The connection of distributed power sources with the utility grid generally needs an electronic power converter for processing the locally generated power and injecting current into the system. This work presents a system intended to low-power distributed generation composed by a DC primary source, as a fuel cell. A boost converter connects the supply to an
Publicado em: 2006
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7. ANÁLISE TEÓRICA E EXPERIMENTAL DO COMPORTAMENTO DE GRANDES E PEQUENOS SINAIS E DESENVOLVIMENTO DE UM NOVO MODELO DINÂMICO DE PEQUENOS SINAIS DO CONVERSOR ZVS-PSM-FB.
Esta Dissertação de Mestrado apresenta o desenvolvimento de um novo modelo dinâmico para o conversor CC-CC Ponte-Completa Modulado por Deslocamento de Fase e com Comutação em Zero de Tensão (ZVS-PSM-FB). Inicialmente, o conversor ZVS-PSM-FB é analisado, onde são derivadas as equações que definem a operação em regime-permanente do conversor. A seg
Publicado em: 2006
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8. Compensação em frequencia de amplificadores CMOS de dois e tres estagios
This dissertation analyzes the project techniques used in frequency compensation of CMOS operational amplifiers (op-amps). A collection of 10 op-amps, including two and three stages amplifiers was fabricated for test. Power consumption, unity gain frequency and stability were aimed for performance comparison. Poles movement analysis was extensively exploited
Publicado em: 2004
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9. Vibrations of a parametrically and self-Excited system with ideal and non-ideal energy sources
Interactions between parametric, self-, and externally excited vibrations are analysed in this paper. The physical model of the vibrating system consists of a non-linear spring with periodically changing stiffness of Mathieu type and a non-linear damping described by Rayleigh's term. This system is additionally forced by a harmonic force (ideal system), or b
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-12
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10. Eletrodissolução anódica em sistema de injeção em fluxo: uma alternativa rápida e eficiente para dissolução de ligas metálicas
Anodic electrodissolution procedure in a flow injection system for determination of constituents in alloys is discussed. This approach implement sample preparation procedure by using a chamber and a DC power supply with constant direct current. Solid sample was attached to chamber as anode. In this review a general overview of these procedure is presented. T
Química Nova. Publicado em: 2000-04
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11. Gerador de indução associado a inversor PWM operando com frequencia constante
Some alternatives to the three-phase cage-rotor induction machine application in electric power generation were analyzed in this investigation. The proposed generation systems ensure satisfactory energy quality, as they are able to maintainbalanced three-phase voltage, with sinusoidal waveform and constant frequency at 60Hz. These systems are intended to be
Publicado em: 1999
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12. Projeto, desenvolvimento e construção de uma fonte de alta tensão pulsada para polarização de valvulas Klystron
A pulsed high voltage power supply, used for feeding a Klystron RF amplifier, in the Laboratorio Nacional de Luz Síncroton (LNLS) linear accelerator (LlNAC) is described. The design, development, assembling and constructive details are included. The system, named modulator, provides a 3 ?mu?s pulses of 250 kV and 250 A, with voltage stability better than 1%
Publicado em: 1993