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 103 for “"Pulse Width Modulation"”.
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Design of high fidelity pulse width modulation inverter
Pulse-width modulation (PWM) is well established in power electronics as a basis for inverters with sinusoidal output voltages. It provides two crucial advantages: high power delivery efficiency and easy digital-to-analog demodulation. Thus PWM can be applied in audio signal processing chain as a …
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Digital Pulse Width Modulation: Analysis, Algorithms, and Applications
When the input to a PWM modulator is a sequence of uniformly spaced samples of the original signal, the resulting uniform-sampling PWM signal has high distortion. It is possible to eliminate the distortion completely by converting the uniform-sampling input sequence into a natural-sampling sequence …
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Full software AC servo controllers with dynamic pulse width modulation
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Analog Single Sideband-Pulse Width Modulation Processor for Parametric Acoustic Arrays
… the double time-derivative of the square of the modulation envelope. This thesis presents a fully analog processor which encodes the audio into two Pulse Width Modulated (PWM) signals in quadrature phase and sums them together to produce a Single Sideband (SSB) spectrum around the fundamental …
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Design and Analysis of Pulse -Width Modulation Techniques for Spectrum Shaping
… spectrum and then to realize it using a proper modulation scheme. The results of Pd-PWM and FM-PWM bring us one step closer to understanding how to meet this goal.
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High-resolution Digital Pulse width Modulation Techniques for Digitally Controlled Power Supplies
L'abstract è presente nell'allegato / the abstract is in the attachment
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Controlling the Vienna rectifier using a simplified space vector pulse width modulation technique
In this thesis, a simplified Space-Vector Pulse-Width-Modulation (SVPWM) technique for the Vienna rectifier is introduced to reduce the computational burden, the switching losses and the Total-Harmonic-Distortion (THD). Furthermore, the robustness of this modulation technique is tested under …
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Impact of pulse width modulation schemes In eccentricity fault detection using current signature analysis
… However, the effectiveness of MCSA based on the modulation scheme employed in inverter-driven setup is underexplored. This thesis addresses this gap by analyzing the impact of Sinusoidal Pulse Width Modulation (SPWM) and Selective Harmonic Elimination (SHE) on diagnosing eccentricity faults in …
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Space vector pulse-width modulation for multilevel inverters and solution to modulation dependent problems
The Space vector PWM (SVPWM) is a prominent modulation technique for multilevel inverters similar to two-level inverters. However, due to complex geometry of the space vector diagram and a large number of switching states, the implementation of SVPWM for multilevel inverters is considered complex. …
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Kalman filter non-linear control law for a gyroscope pulse width modulation torque loop
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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Development of pulse-width-modulation techniques for multi-phase and multi-leg voltage source inverters
… voltage source inverter (VSI). Various pulse width modulation (PWM) schemes have been developed for multi-phase machines with concentrated and distributed windings, utilising both carrier-based PWM and space vector PWM (SVPWM) approaches. However, no systematic analysis has been …
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Design of dual-input two phase dc/dc converter with modified pulse width modulation (mpwm)
Recently, hybrid energy source/renewable energy has attracted interest as the next-generation energy system capable of solving the problems of global warming and energy exhaustion caused by increasing energy consumption. Energy sources such as wind turbines and photovoltaic (PV) systems are …
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Desenvolvimento e validação de um sistema PWM (Pulse Width Modulation) para aplicação de defensivos em taxa variável
… disponíveis, a modulação por largura de pulso (Pulse Width Modulation – PWM) destaca-se por possibilitar o ajuste dinâmico da vazão, mantendo a pressão de trabalho estável e assegurando melhor uniformidade operacional. Esta tese teve como objetivo desenvolver, analisar e validar um sistema PWM …
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Microcontroller Design of a Bidirectional Three-Level Pulse Width Modulation AC/DC Converter for Vehicle-to-Grid Application
<p>Bidirectional chargers provide plug-in electric vehicles (EV) the ability to not only transfer energy from the grid to the vehicle, but also transfer energy from the vehicle to the grid (V2G). The V2G mode allows power utility companies to offset peak power consumption thus allowing household …
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Investigation of Control Concepts for High-Speed Induction Machine Drives and Grid Side Pulse-Width Modulation Voltage Source Converters
Control of a low voltage ac/dc/ac converter for high-speed induction machine drive applications has been investigated. Such a configuration can be applied, for example, in microturbines and high-speed spindles. Scalar control is usually applied for the control of high-speed drives especially in the …
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Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples
… control a PMSM in a quadrotor. FOC of PMSM and Pulse Width Modulation (PWM) are introduced. The simulation results of FOC of PMSM with third-harmonic injection PWM and traditional FOC are compared. This comparison proves that FOC of PMSM with third-harmonic injection provides a better dynamic …
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Linearization of a pulse width modulated power amplifier
… goal of this thesis is to investigate the use of pulse width modulation in a high efficiency integrated CMOS power amplifier for a wireless application. Though high efficiency CMOS power amplifiers exist in academia, the goal of this project is to explore pulse width modulation as a method of …
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Comparison Between PWM and SVPWM Three-Phase Inverters in Industrial Applications
… first inverter is 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 …
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Harmonic elimination by switching angle optimization technique for multilevel inverter
… low level of total harmonic distortion (THD). A pulse width modulation generators have been connected to switching devices of 7-level CHBMLI. The reference waveform for pulse width modulation (PWM) generator is considered to be a sinusoidal wave to obtain ideal AC output voltage waveform from the …
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