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 20 of 62 for “"load range"”.
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High Efficiency Optimization of LLC Resonant Converter for Wide Load Range
… to 83% for desktop derived servers, depending on loading condition and server type. Furthermore, recently some industry companies came out with a much higher efficiency target for the whole AC/DC front-end converter over a wide load range. Distributed power systems are widely adopted in the …
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Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range
… alternative when the quality factor of the load is significantly high. The input current of a CF resonant inverter is considerably smaller than the output current, which benefits efficiency. A simple, parallel resonant tank is sufficient to create a high-power sinusoidal signal at the …
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A Two-mode Buck Converter toward High Efficiency for the Entire Load Range for Low Power Applications
… of power converters, especially at light load. This thesis research investigated a power converter to supply power for the microprocessor of a smart camera. The input voltage of the converter is 5 V, and the output voltage is 1.2 V with the load ranging from 10 mA (12 mW) to 1200 mA (1440 …
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Design and evaluation of a reconfigurable stacked active Bridge dc/dc converter for efficient wide load-range operation
… in a low power mode that greatly increases light-load efficiency by reducing core loss and extending the zero-voltage switching (ZVS) range. The converter is implemented with a single compact magnetic component, providing power combining, isolation, and energy transfer inductance. The theory of …
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Characterization of Glow Plug and HCCI Combustion Processes in a Small Volume at High Engine Speed - Load Range, Emission Characteristics and Optical Diagnostics
The objective of this research that has taken me halfway to my PhD degree was to understand how HCCI combustion behaves in a small volume at high rotational speed. The investigation has been carried out using a modified model airplane engine. The whole study can be divided into two main parts; in …
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High-frequency off-line power conversion using quasi-resonant and multi-resonant techniques
… with emphasis on the conversion-frequency range, efficiency, load range, input-voltage range, output power, dynamic response, and power density. A comprehensive dc analysis of the half-wave and full-wave, half-bridge zero-current-switched quasi-resonant converters (QRCs) is presented. …
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Class-E Current Source Power Conversion
… constant current within a wide output voltage range, similar to LED drivers. The load-independent (LI) Class-E inverter is a promising topology for such applications since it can realize zero-voltage switching (ZVS) within a wide load range. Class-E current source can be achieved by converting …
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Investigation of High Performance AC/DC Front-End Converter with Digital Control for Server Applications
… high efficiency requirements for a wide load range for power management in telecom and computing equipment. High efficiency over a wide load range is now a requirement. On the other hand, power density is still a big challenge for front-end AC/DC converters. For DPS systems, front-end …
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Load-Independent Class-E Power Conversion
… induction heating, and plasma pulsing. The load current in these applications usually varies over a range. Efficiency of a conventional Class-E design degrades dramatically due to the hard switching beyond the optimum conditions. Keeping ZVS with load change in a Class-E topology is …
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A Two-Mode Synchronous Buck Converter for Low-Power Devices with the Sleep Mode
… car black box varies significantly between light load and heavy load. The high efficiency voltage regulator is necessary in prolong the life of smart camera battery. Since the smart camera only recording the video when car is driving, the most time of the smart camera works in the sleep mode. …
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Improvements in integrated high-quality rectifier-regulators
… practical for universal input voltage and wide load range applications because of high bulk-capacitor voltage stress at lighter loads. This load-dependent characteristic of the bulk-capacitor voltage is due to the integration of a discontinuous conduction mode boost converter and a continuous …
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A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications
… the power converter efficiency for light load, while being able to manage heavy load. The power stage of traditional buck converter is optimized for maximum load, at the cost of light-load efficiency. Wei proposed a multiphase buck converter incorporating the baby-buck concept and optimum …
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Designing an ultra low quiescent current buck switching regulator
… a few micro-amps of supply current during no load output conditions, while maintaining low output voltage ripple. The regulator also has high efficiency for current loads above an amp to make the converter useful in a variety of applications. The specifications will be achieved by implementing …
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Efficiency Performance Improvement Using Parallel DC-DC Converters with a Digital Controller
… and implements a digital control scheme and load-share controller. A model of the system is developed in MATLAB Simulink and the model demonstrates the improved converter’s efficiency particularly at low load conditions. This simulation is then designed into a hardware system running three …
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Seismic Performance of Prestressed Pile-To-Bent Cap Connections
… completely on mechanical bond to develop a load path from the superstructure of the bridge to the foundation. Typical construction practices involve driving precast prestressed concrete piles to a specified depth and leaving a portion of the pile above ground to be used for an intermediate …
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Design, dynamic modeling, simulation and feedback control of hydrostatic bearing
… motor to drive the carriage as well as to preload the hydrostatic bearings has been developed by Professor Alexander Slocum and Gerald Rothenhöfer of the Massachusetts Institute of Technology's Mechanical Engineering Department. The Hydrocline is made to cope with the increasing requirements …
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Gas chromatographic determination of carbon dioxide, carbon monoxide, and nitric oxide in diesel exhaust
… while the engine operated at constant speed and load. Engine speed was kept at 1400 rpm while several different loads were applied. The results of these tests indicated that carbon dioxide, carbon monoxide, and nitric oxide concentrations all increased with load in the load range studied. Carbon …
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Novel zero-voltage switching techniques for pulse-width-modulated converters
… are capable of regulating the output for a wide load and input voltage range while maintaining constant-frequency operation. By employing a saturable inductor, the load range under which ZVS is maintained can be significantly extended without increasing the voltage stress of the power switch. The …
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Topology and Control Investigation of Soft-Switching DC-DC Converters for DC Transformer (DCX) Applications
… has no deadtime conduction loss, and almost has load-independent voltage gain. An axis and center symmetric (ACS) method is proposed to achieve this switching transition. Based on this method, an overall design procedure of CLLC-DCX with DAS modulation is also proposed. However, designing a …
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Synthesis gas use in internal combustion engines.
… solely in an HCCI regime throughout the complete load range. The more common CI and SI regimes will likely be necessary for high load engine operation. The results from this doctoral work sheds light into the fundamental aspects of syngas combustion and also provides a foundation for future …
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