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 276 for “"PWM"”.
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A direct PWM loudspeaker feedback system
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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PWM strategies for multilevel multiphase AC drives
Pulse width modulation (PWM) strategies for multilevel multiphase ac drives have been analysed in this thesis. The large amount of published work in the area of multiphase drives recognises their advantages compared to the standard three-phase solutions. Some of them arc improved power sharing …
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The application of vector control to PWM drives
… consisted of an open loop Pulse Width Modulated (PWM) inverter induction motor drive system, whereas the second was a PWM Vector Control System.<br/><br/>The thesis also contains the results of experimental investigations into the performance of the drive system, where the control strategies were …
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Parameter estimation of induction motors using PWM inverters
… algorithms utilizing the DSP controlled 3 phase PWM inverter constructed in [12] are discussed. A single stator voltage test is carried out with the machine's rotor standing still. The resulting transient is used to determine machine electrical parameters. Several algorithms for this are …
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Soft-switching techniques for high-power PWM converters
… several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus have advantages over conventional techniques in efficiency, power density, …
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Modeling and control of three-phase PWM converters
… models are developed for major three-phase PWM converters. The models are correct for the case when the voltage sources or capacitors with nonzero parasitic resistances are placed across the converter dc port or ac terminals. The effects of the parasitic resistances are described by …
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Modeling and Control of Parallel Three-Phase PWM Converters
… of parallel three-phase pulse-width modulated (PWM) converters. The converters include three-phase boost rectifiers, voltage source inverters, buck rectifiers and current source inverters. The averaging of the parallel converters is performed based on a generic functional switching unit, which …
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Three-phase power conversion using soft-switching PWM techniques
… issues related to high-frequency soft-switching PWM three-phase power converters. These are: 1. Analysis, synthesis, and design of three-phase soft-switching PWM power converter topologies 2. Design of input EMI filters for three-phase converters 3. Design of microprocessor controllers for …
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Equivalent Circuit Model of High Frequency PWM and Resonant Converters
Distributed power system (DPS) is widely adopted in Power supplies for the telecom, computer and network applications. Constant on-time current mode control and V2 control are widely used as point-of-load (POL) converters and voltage regulators (VR) in DPS systems. Series resonant converters (SRC) …
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Determining the Optimum Operating Parameters of a Unipolar PWM Inverter
… the optimum operating parameters of a unipolar PWM inverter through theoretical and experimental analysis. The inverter is investigated in its simplest form without input DC-DC conversion or output filtering. The intent of this study is to understand the core of the inverter thoroughly before …
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On low-pass reconstruction and stochastic modeling of PWM signals
Mathematical modeling of pulse width modulation (PWM) is given. For a band-limited, finite energy input signal, a PWM generation mechanism is investigated in linear and non-linear blocks separately. Following the common practice, a comparator block with a periodic reference signal is offered as a …
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A SiC JFET-Based Three-Phase AC PWM Buck Rectifier
Silicon carbide (SiC) power switching devices promise to be a major breakthrough for new generation ac three-phase power converters, offering increased junction temperature, low specific on-resistance, fast switching, and low switching loss. These characteristics are desirable for increasing power …
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Average current-mode control and charge control for PWM converters
Two control schemes for PWM converters, average current-mode (ACM) control and charge control, are studied in this dissertation. The small-signal models are derived for continuous-conduction mode PWM converters employing these two controls. Sampled-data modeling is applied to the current loop …
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RETI DI CONTROLLO A CAPACITÀ COMMUTATE PER CONVERTITORI DC/DC PWM
The thesis describes the disign of a digitally programmable switched capacitor filter. The filter was employed as external feedback network to control a buck power cell, according to the zero/pole cancellation method. Static and dynamic characterizations of the close loop converter showed good …
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Space Vector Pwm Techniques for Six_Phase Three-Level Inverter-Fed Drives
In recent years, research in the area of multiphase drives has increased significantly. Having higher number of machine phases allows the current to be shared between the phases, thus reducing the current rating of power semiconductors used in the power converter. Additionally, if a multilevel …
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PWM Techniques for Control of Dual-Inverter Supplied Six-Phase Drives
… are not required.Two pulse width modulation (PWM) techniques for control of the dual-inverter supplied six-phase drives are proposed in this thesis. The first is a reference sharing algorithm where the inverters are modulated using reference voltage that is shared equally and unequally between …
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Comparison Between PWM and SVPWM Three-Phase Inverters in Industrial Applications
… a three-phase sinusoidal pulse width modulation (PWM) inverter that generates gate-control signals using a sinusoidal wave source. It is shown that pulse width modulation utilizes a simpler approach to convert DC power into AC.</p><p>The second inverter is a three-phase space vector pulse width …
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Active-clamp PWM converters: design-oriented analysis and small-signal characterization
… an active clamp (ACL) circuit in high-frequency PWM converters with an electrical isolation. Existing design guidelines and design trade-offs for the ACL in forward and flyback converters are reviewed, and specific properties of both circuits that are caused by the ACL are highlighted. Based on …
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A Three-Phase Single-Stage AC-DC ZVZCS PWM Full-Bridge Converter
… standard phase-shift pulse width modulation (PWM). In the thesis, derivation of the converter is discussed and its general operation is re viewed. The modes of operation of the converter are explained in detail and analyzed and the results of the analysis are used to develop guidelines for …
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A Three-Phase Single-Stage AC-DC ZVZCS PWM Full-Bridge Converter
… standard phase-shift pulse width modulation (PWM). In the thesis, derivation of the converter is discussed and its general operation is re viewed. The modes of operation of the converter are explained in detail and analyzed and the results of the analysis are used to develop guidelines for …
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