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 36 for “"switched mode"”.
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The design and control of mechanical switched mode drives
… design is evaluated and detailed mathematical models are presented and compared to the prototypes. In addition a detailed design methodology is put forward for step-up/stepdowndevices.
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Improved performance alternator with fully integrated Switched-Mode Rectifier
… of automotive alternators. The use of a Switched-Mode Rectifier (SMR) allows the alternator to run at a load-matched condition, optimizing power and efficiency over all operating speeds. However, the use of SMR's has largely been focused on designs for 42 V alternators. This thesis …
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Design of dual-output alternators with switched-mode rectification
… design of alternators incorporating dual-output switched-mode rectifiers. The approach enables the full load-matched power capability of the alternator machine to be achieved, with power delivered to the two outputs in any desired combination. Switched mode rectifier topologies for this …
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Wide Range Switched Mode RF Power Amplifiers and their applications
Switched-mode power amplifiers (SMPAs) are desired that can work across a wide range of power levels and load impedances with fast response speed while maintaining high efficiency. Such designs would be valuable for many applications including plasma generation and wireless power transfer. We …
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Advancing the Performance of a Switched-Mode Radio Frequency Power Generation Architecture
… performance improvements of a recently proposed switched-mode power generation architecture - the Multi-Inverter Discrete Backoff (MIDB) system - that is currently in development. The RF power system is intended to be used in applications such as radio frequency plasma generation for …
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The theory and design of switched-mode power transformers for minimum conductor loss
… presented. Emphasis is placed on applications in switched-mode power conversion. One-dimensional radial variation of the field quantities is assumed. The first phase of the investigation is for sinusoidal excitation; solutions for the current density and magnetic field intensity are derived and …
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Hybrid SC-Inductive Based Topologies for Low-volume High-efficiency Switched-mode Power Supplies
Switched-mode power supplies (SMPS) are widely used as the voltage or current regulators for electronic devices. The most commonly used SMPS are inductive converters based on conventional buck and boost converter topologies due to their simplicity and relatively high power density and efficiency. …
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Non-linear Dynamic Transformer Modelling and Optimum Control Design of Switched-mode Power Supplies
… a low-cost microcontroller. Accurate transformer modelling is a necessary exercise for the study of the yback converters as well as for model-based controller design. Therefore, a non-linear dynamic model, which allows an accurate representation of both linear dynamics and non-linear core …
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Investigation into the use of high-efficiency switched-mode class E power amplifiers for high-dynamic range pulse-mode applications
… operated in either a continuous wave or a pulsed mode where the transmitter is periodically turned on for a portion of time. These systems commonly use a power amplifier in the transmitter to raise the power level of the transmitted signal to a value sufficient to meet system sensitivity …
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Digital control based on both small and large signal model based approaches for high switching frequency switched mode power converters
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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High Speed Rotary PWM On/Off Valves for Digital Control of Hydraulic Pumps and Motors
… concepts are presented in this dissertation for switched-mode pump and pump/motor circuits. An analysis framework is developed that predicts valve performance and typical losses which can be used for design and optimization. Physics based dynamic models of switched-mode pump and motor circuits …
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Modulated Frequency Multiplier Inverter
… Previous approaches to this problem, such as switched-mode inverters combined with tunable matching networks provide adequate, albeit bulky, costly, and complex solutions at lower HF frequencies, while at higher frequencies inefficient linear amplifiers dominate. This thesis introduces an …
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Enhanced next generation alternator
… designs with conventional diode rectifiers and switched-mode rectifiers are investigated. It is found that optimized Lundell alternators are capable of meeting the demands of future systems, and that wound field synchronous machines may also be competitive. It is also found that incorporation of …
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Bridgeless Active Power Factor Correction Using a Current Fed Push Pull Converter
… Converter</p> <p>Jeramie Seth Bianchi</p> <p> Switched Mode Power Supplies have become increasingly popular for efficient methods of delivering power to an assortment of electronic devices. This thesis proposes a method of using a current fed push pull converter to provide active power factor …
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Efficiency improvement in nanometre CMOS outphasing power amplifiers
… PAs which utilise unisolated power combiners and switched-mode voltage-source PA stages.<br/><br/>Power combiner design is advanced with the creation of two novel three-port coupled coils which allow multiple inductors to be merged into a single compact low-loss structure. Four Wilkinson power …
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Automated power supply testing
… an Automated Testing system used to test a switched mode power supply. It includes all the basic principles found in industrially available Automatic Test Equipment (ATE). The system consists of a Testing Jig on which the testing is done, interfaced to a computer through a controlling card. …
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Techniques for Efficient Wide-Range Radio-Frequency Power Generation System
… explores a rf power generation system based on switched-mode power amplifiers (PAs), with associated PA system architecture, control techniques, and implementation optimizations, to achieve both high performance and good efficiency for the target applications.
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An energy buffer for constant power loads
… while the output consumes constant power. A switched-mode power supply consisting of a cascaded boost and buck converter accomplishes this by storing energy in the boost stage output capacitor. Experimental results demonstrate that the converter exhibits a resistive input impedance at …
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Laser ablation for sample introduction in inductively coupled plasma spectrometry.
… metallurgical materials. It was found that the Q-Switched mode of laser operation provided greater sensitivity than long pulsed operation. This research reports the first laser ablation ICP studies on paints and polymers. Ablation of paints was found to provide good precision. This was attributed …
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A Silicon Carbide Power Management Solution for High Temperature Applications
… solutions in the form of linear regulators and switched capacitor converters. While switched-mode converters provide high efficiency, the requirement of an inductor hinders the development of a compact, integrated solution that can endure harsh operating environments. </p> <p>Although the …
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