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Itens para a visualização no momento 21-30 of 441
Nova metodologia para a estimativa de capacitância e consumo de potência de portas lógicas complexas CMOS no nível lógico
(Universidade Federal de Santa Maria, 2005-10-31)
This dissertation presents a methodology of capacitance estimation and power consumption in CMOS circuits combinational constituted basically of complex logic gates at logic level. The main objective in the development of ...
Prototipação e análise de circuitos mutiplicadores array de baixo consumo
(Universidade Federal de Santa Maria, 2005-03-23)
This work presents the prototyping and analysis of new multiplier architectures under the physical level of abstraction. Circuits recently presented in the academic community are analyzed and compared against the state of ...
Projeto de reatores eletronicos para hid baseado no conversor chopper AC
(Universidade Federal de Santa Maria, 2007-08-24)
This thesis proposes a design of a power supply for high-pressure discharge lamps based on a high efficiency and high power factor electronic ballast, without exciting the
intrinsic acoustic resonance. The ballast consists ...
Análise de estabilidade de retificadores com correção de fator de potência empregando modelos lineares periódicos no tempo
(Universidade Federal de Santa Maria, 2012-07-30)
Many control techniques applied to converters with power factor correction (PFC) use
cascaded control to compensate the output voltage and the input current. These techniques
usually employ linear time-invariant (LTI) ...
Uma proposta de interconexão de proteções para detecção de ilhamento em sistemas de geração distribuída
(Universidade Federal de Santa Maria, 2014-02-27)
This work presents a methodology for detecting islanding in distributed generation
systems - DG - which use internal combustion engines as primary sources and synchronous
generators connected directly to grid. The proposed ...
Aumento da eficiência de painéis fotovoltaicos com esfriamento por energia geotérmica e aquecimento de água
(Universidade Federal de Santa Maria, 2014-02-24)
This thesis deals with the increased efficiency of photovoltaic panels (PVs) through
cooling the cells by geothermal energy and water heating. Initially, a photovoltaic modeling is
made proposing an equation to obtain the ...
Sistema eletrônico isolado com elevado fator de potência e reduzidas capacitâncias para alimentação de leds aplicado à iluminação pública
(Universidade Federal de Santa Maria, 2013-08-06)
This work aims to develop a family of electronic converters with electrical isolation to supply a group of power light emitting diodes, applied to street lighting systems. The converters have high power factor and still ...
Comutador eletrônico de taps aplicado a um transformador de distribuição monofásico
(Universidade Federal de Santa Maria, 2014-02-27)
Voltage regulation still is a problem faced by power utilities currently. In addition to the series
impedance and the significant load variation of the distribution grids, the main causes of voltage
regulation problems, ...
Sistema eletrônico para lâmpadas fluorescentes de indução baseado na topologia sepic half-bridge bi-integrada com controle de intensidade luminosa por modulação de baixa frequência
(Universidade Federal de Santa Maria, 2015-06-15)
This master thesis presents the analysis and design of an electronic drive system for fluorescent induction lamps. This lighting technology, despite being patented since the 60s, is not widely diffused in the market context. ...
Impacto técnico e econômico do uso de microturbinas para geração de energia elétrica em aterros sanitários sobre os sistemas de distribuição
(Universidade Federal de Santa Maria, 2015-08-26)
The electricity generation in Brazil comes mainly from hydroelectric potential. Despite the importance of these sources, Brasil has several alternatives for electric power generation, such as those derived from biomass. ...