Browsing by Subject "Electric current converters"
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Item Analysis and design of a forward power converter(Texas Tech University, 2004-12) Nathadi, Raghotham RWith advances in microelectronic fabrication and semiconductor devices, the size of electronic equipment is ever decreasing. Virtually, every piece of electronic equipment is powered from a DC power source, be it a battery or a DC power supply. The power supply constitutes to a main portion of any electronic device. Therefore, the key requirements for a power supply are lighter weight, reduced size, and reduced heat dissipation. There have been two technologies in power supplies: Linear and Switched mode. Though linear supplies have many desirable characteristics such as simplicity, low output ripple, excellent line and load regulation, fast response time to line or load changes, and low EMI, they suffer from poor efficiency and occupy large volumes. Switching power supplies are becoming popular because they offer better solutions to these problems. Switching voltage regulation is the technique by which an unregulated source power is efficiently converted to regulated load power through the use of controlled power switching devices and energy transfer elements. DC to DC conversion is the heart of any switched mode power supply. There are many choices for DC to DC conversion but forward converter has dominated the market for the past 50 years for commercial power supplies in excess of 50W. At the beginning, this thesis describes the basic functional blocks of a switched mode power supply. Then the design of various elements that are generally used in any switched mode power supply is extensively covered. Later the theory and operating principles and limitations of a forward converter are discussed. Finally, the simulation results for a forward converter and test results on an engineering reference switched mode power supply are presented.Item Design and implementation of a power converter for soil vitrification application(Texas Tech University, 2001-08) Izquierdo Garcia, Roberto CarlosTexas Tech in conjunction with Montech Research proposed the construction of a soil stabilizer using a power graphite torch capable of generating hot plasma gas to melt the soil. The project will be used by the Texas Department of Transportation (TDOx). The present work is a description of the electrical modules implemented to control the power of the equipment. The use of a buck converter to control the output power is proposed. Texas Tech was in charge of the construction of the electrical part of the project, a power supply capable to control 100kW. The TDOx proposed the project because for some applications a material stronger than concrete is required, and the melted soil is three times stronger than concrete. The results observed on the field shows that it is possible to melt down the soil with an output of 80kW. With further improvement on the design of the power modules it is possible to control up to 100kW.Item Interfacing photovoltaic converters to the utility grid(Texas Tech University, 2004-05) Parupalli, SuneethaThe main objective of this project is to develop and intelligent, compact power conditioning module that can be directly interfaced to PV converters and the utility grid. This inverter incorporates smart control electronics that will synchronize to the utility voltage. This involved developing software algorithms to tie all the hardware together and accomplish overall control. Power is successfully fed into the utility using both the photovoltaic arrays and power supply.