Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Variable Voltage"”.
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DC-DC converters with high efficiency over wide load ranges
… In all modes of operation, the regulator output voltage is digitally programmable. This enables variable voltage architectures, in which the power supply of a digital system is dynamically changed depending on the throughput requirements, resulting in significant power reductions.
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Evaluation of two prototype three phase photovoltaic water pumping systems
… systems employed microprocessor control and PWM variable-frequency variable-voltage inversion. Efficiencies, optimality, stability, start-up behaviour, non-productive operating modes and protection were examined. A number of recommendations were proposed for improvements in the basic control …
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An ultra-low voltage FFT processor using energy-aware techniques
… are designed into a real-valued FFT processor: variable FFT length (N=128 to 1024 points), variable bit precision (8,16 bit), and variable voltage supply with variable clock frequency (VDD=1 80mV to 0.9V, and f=164Hz to 6MHz). A variable-bit-precision and variable-FFT-length scalable FFT ASIC …
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A microcomputer controller for a nylon spinning machine
… trains which are used to control two solid state variable frequency variable voltage inverters and their AC motors. The specification calls for 24 controllers to be linked to a PDP 11/23 host computer which holds a library of operating parameters which can be downloaded into each control unit by …
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Tabletop robot to aid in arm rehabilitation of stroke patients
… and built, had a rack and pinion setup with a variable voltage regulator to control its vertical motion and a foam and linear spring combination to allow for yaw, pitch and roll while still providing for support. Testing of the prototype proved extremely valuable in refining the requirements of …
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Power-aware systems
… multipliers, register-files, digital filters and variable-voltage processors demonstrating increases in battery-lifetimes of 60%-200%. In the second half of this thesis we apply power-awareness concepts to data-gathering wireless networks. We derive fundamental bounds on the lifetime of networks …
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Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… architecture. The resulting system has a variable voltage output and a robust response to rapid changes in power demand. Additionally, the HEPS is also demonstrated to fully utilize the mechanical power output capability of the two-stroke engine.</p> <p>Ultimately, the HEPS is …
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The Direct Torque Control of Induction Motors
… different switching tables for the selection of voltage vectors, the performance of direct torque control can be further improved. Further insight into the nature of direct torque control has been gained from the study of the effect of the application of inverter switch settings, or the …
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Energy Shaping Control for Stabilization of Interconnected Voltage Source Converters in Weakly-Connected AC Microgrid Systems
… host the distributed energy resources (DERs). Voltage source converters typically interconnect the DERs to the utility system and used in High voltage dc (HVDC) systems for transmitting power throughout the United States. A microgrid configuration is built at the 13.8kV 4.75MVA National Center …
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Computer aided design and construction of a multi-point positioning actuator system
… with displacement and can be controlled by the voltage/current applied at its terminals. This enables the position of the actuator to be controlled by a proper external circuitry. Its structure is simpler, compared with traditional TLIA. With the exercise of computer aided design and analysis a …
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Smart Wall Outlet Design and Implementation for the DC House Project
… coming from the wall outlet in our homes. This voltage is a standard set from our established infrastructure. Unlike AC devices, DC devices do not have any set standard of voltage they all will run off of. This presents a problem for the DC house as the various loads that will be used will have …