Pulse Density Modulated Soft Switching Cycloconverter, 2010 California Polytechnic State University, San Luis Obispo
Pulse Density Modulated Soft Switching Cycloconverter, Jesse Timothy Adamson
Master's Theses
Single stage cycloconverters generally incorporate hard switching at turn on and soft switching at turn off. This hard switching at turn on combined with the slow switching speeds of thyristors (the switch of choice for standard cycloconverters) limits their use to lower frequency applications.
This thesis explores the analysis and design of a pulse density modulated (PDM), soft switching cycloconverter. Unlike standard cycloconverters, the controller in this converter does not adjust thyristor firing angles. It lets only complete half cycles of the input waveform through to the output. This allows and requires a much greater frequency step down from the …
Modular Laser Combat System For Remotely Operated Vehicles: Bridging The Gap Between Computer Simulation And Live Fire, 2010 California Polytechnic State University, San Luis Obispo
Modular Laser Combat System For Remotely Operated Vehicles: Bridging The Gap Between Computer Simulation And Live Fire, Thomas Edward Fulenwider
Master's Theses
In the emerging industry of small unmanned vehicles, pioneered by small businesses and research institutions, a suitable combat system test platform is needed. Computer simulations are useful, but do not provide the definitive proof of effective operation necessary for deployment of a combat system. What is needed is an affordable simulated weapons system that enables live flight testing without the used of live weaponry.
A framework is developed here for the construction of a simulated weapon using Free Space Optical (FSO) infrared communication. It is developed in such a way to ensure compatibility with a variety of platforms including ground …
Analog Electric Guitar Distortion Effects And Headphone Amplification, 2010 California Polytechnic State University - San Luis Obispo
Analog Electric Guitar Distortion Effects And Headphone Amplification, Michael Alexander Jenkins
Electrical Engineering
The goal of this project was to create an electronic system which integrates popular audio processing effects as well as headphone amplification circuitry for use with an electric guitar. By implementing a system which fits natively inside the body of an electric guitar, the need for numerous external accessories relating to a standalone amplifier system is eliminated, improving device versatility and portability.
Electric Bicycle System, 2010 California Polytechnic State University - San Luis Obispo
Electric Bicycle System, Robert Cong, Rodney Martinez, Mark Casilang, Peter Vong
Electrical Engineering
The Electric Bicycle System is a systems project that incorporates three different ways of charging a lithium-ion battery: the 120VAC wall outlet, regenerative braking, and solar power; which is used to power an electric hub motor running a bicycle. The purpose of the project is to show that it is possible and relatively simple, to build an electric bicycle by oneself. This project can be broken down into five separate categories: the lithium-ion battery, the DC-DC boost converter, the solar panel, the motor, and the motor controller. Each of these will be built upon and improved further by future students, …
Magnetic Design Web Application, 2010 California Polytechnic State University - San Luis Obispo
Magnetic Design Web Application, Michael Brim
Electrical Engineering
The automated Magnetic Design Web Application, available at http://www.magneticdesign.org, generates the full design process of a power transformer, gapped inductor and toroidal inductor given design specifications provided by the user. Calculations are accomplished using Area Product, Ap, or Core Geometry, Kg, procedures. All design processes mirror the format used in Dr. Taufik’s Introduction to Magnetic Design lecture-notes. An administrative backend is provided where instructors can add or modify core design values to expand the array of materials used. The project aims to aid student understanding of magnetic design and course concepts while allowing instructors to broaden the scope of material …
Single-Ended Tube-Based Guitar Amplifier, 2010 California Polytechnic State University - San Luis Obispo
Single-Ended Tube-Based Guitar Amplifier, Joseph (Joe) Linn
Electrical Engineering
Since the advent of the transistor, the vast majority of designers and manufacturers of electronic devices have abandoned the vacuum tube. Compared to transistors, tubes are orders of magnitude larger, more power hungry, more expensive, less reliable, and dissipate much more heat. In short, transistors are superior devices for almost all applications. Despite this fact, many makers of high-end audio and instrument amplifiers continue to base their designs on tube technology.
Given all of their shortcomings, the obvious question is: Why bother with tubes? Proponents of tube-based audio amplifiers cite a certain “warmth” that tube circuitry lends to the sound …
Polyenvi, 2010 California Polytechnic State University - San Luis Obispo
Polyenvi, Stephen Beard, Josh Engel, Paul Fake, Diego Flores, Alvaro Nunez, Miguel Wong
Electrical Engineering
Poor indoor air quality is a problem that is recognized by the Environmental Protection Agency (EPA) to cause health issues. In order to raise awareness of this problem, this document outlines the construction of a device that economically measures air quality through five metrics: dust, smoke, ozone, humidity, and temperature. The device integrates with a router to provide users access to information about their indoor air quality anywhere over the internet as well as local access to the data via an LCD mounted on the router. By increasing indoor air quality awareness, this device will aid users in making adjustments …
Class-D Power Amplifier, 2010 California Polytechnic State University - San Luis Obispo
Class-D Power Amplifier, Joseph Maldonado, Jeovany Vega
Electrical Engineering
No abstract provided.
Negative Conductance Load Modulation Rf Power Amplifier, 2010 California Polytechnic State University, San Luis Obispo
Negative Conductance Load Modulation Rf Power Amplifier, Cody R. Neslen
Master's Theses
The number of mobile wireless devices on the market has increased substantially over the last decade. The frequency spectrum has become crowded due to the number of devices demanding radio traffic and new modulation schemes have been developed to accommodate the number of users. These new modulation schemes have caused very poor efficiencies in power amplifiers for wireless transmission systems due to high peak-to-average power ratios (PAPR). This thesis first presents the issue with classical power amplifiers in modern modulation systems. A brief overview of current attempts to mitigate this issue is provided. A new RF power amplifier topology is …
A Constant Conduction Angle Biased Rf Power Amplifier For Improved Linearization In Class C Operation, 2010 California Polytechnic State University, San Luis Obispo
A Constant Conduction Angle Biased Rf Power Amplifier For Improved Linearization In Class C Operation, Greg Lacaille
Master's Theses
Class C power amplifiers offer higher efficiency than class B power amplifiers, but suffer from poor linearity. A feedback based biasing system to improve the linearity of a class C power amplifier is designed. A class B amplifier with a gain of 20 dB and 20 MHz bandwidth at 900 MHz acts as the launching point for the design. The biasing and output network of the class B power amplifier is modified to produce a class C amplifier at conduction angles of 180°, 162°, 126°, 90°, and 54°. A feedback based biasing system, which uses two matched and scaled down …
Properties And Device Applications Of Silicon And Silicon-Germanium Nanostructures With Different Dimensions, 2010 New Jersey Institute of Technology
Properties And Device Applications Of Silicon And Silicon-Germanium Nanostructures With Different Dimensions, Han-Yun Chang
Dissertations
Defect-free crystalline Si/SiGe(Ge) nanostructures are demonstrated despite the 4% lattice mismatch between Si and Ge. The lattice mismatch-induced strain is sufficiently relaxed through the designed, cluster morphology, or nanowire (NW) structures. Future device applications of these nano structures require complete understanding of their structural, optical, electrical and thermal properties. This study explores these properties in two-dimensional (2D) Si/Si:B delta-doped multilayers, 2D Si/Si1-xGex planar multilayers, three-dimensional (3D) Si/Si1-xGex cluster multilayers, one-dimensional (1D) Si NWs and 1D Si/Ge NW heterojunctions (HJs).
Raman scattering and photoluminescence measurements show that by alternating heavily boron-doped layers with layers of …
Mechanisms For Quality-Of-Service Provisioning In Networks With Extended Services, 2010 New Jersey Institute of Technology
Mechanisms For Quality-Of-Service Provisioning In Networks With Extended Services, Zhen Qin
Dissertations
The emerging network traffic with various Quality-of-Service (QoS) requirements creates a demand for QoS service provisioning beyond the best effort service that Internet currently provides. QoS provisioning requires a framework that satisfies users' QoS and cost demand while maximizes benefits for network service providers. It is considered that QoS provisioning involves three issues: a) estimations of the network QoS performance, which can be achieved by performing network measurement; b) dissemination of the measured QoS states throughout the network with states exchanged among different network routers; and c) QoS routing. In this dissertation, these three issues are addressed.
In QoS networks, …
A Fpga/Dsp Based Ultrasound System For Tumor Detection, 2010 New Jersey Institute of Technology
A Fpga/Dsp Based Ultrasound System For Tumor Detection, Ashish Ravindra Ratnakar
Theses
This work presents a method of detection of size and location of tumor using ultrasound transmission. The system utilizes Quantitative Ultrasound (QUS) which means sending an ultrasound signal from a transmitter and receiving it at multiple receivers. This received signal is analyzed for echogenic as well as echolucent tumors to differentiate between the two along with non-tumorous sample and also for delay, signal distortion to determine the size/location of the tumor.
This analysis is further implemented using Field Programmable Gate Array (FPGA) and Digital Signal Processor (DSP) technologies. The proposed detection system utilizes Low Transient Pulse (LTP) technique. In this …
A Comparison Of Software Engines For Simulation Of Closed-Loop Control Systems, 2010 New Jersey Institute of Technology
A Comparison Of Software Engines For Simulation Of Closed-Loop Control Systems, Sanket D. Nikam
Theses
A wide array of control system design and simulation software engines is available in market. It includes MATLAB-Simulink, LabVIEW, Maple-MapleSim, Scilab-Scicos, VisSim and Mathematica-Control Professional Suite (CPS). Among all of them MATLAB-Simulink is dominant and widely used software engine. The main aim of this study is to implement different state space control methods for non-linear Furuta pendulum system in each one of them and to compare performance against MATLAB-Simulink.
Different parameters like learning curve, interoperability, flexibility, control design tools, documentation and tech support are considered for efficiency comparison. It is shown that MapleSim has multi-body intuitive physical modeling (acausal) approach …
A Study Of Probability Distributions Of Dct Coefficients In Jpeg Compression, 2010 New Jersey Institute of Technology
A Study Of Probability Distributions Of Dct Coefficients In Jpeg Compression, Gopal Thirumalai Narayanan
Theses
The Discrete Cosine Transform (DCT) used in JPEG compression has shown excellent energy compaction properties that rival that of the ideal Karhunen-Loève Transform. Lossy compression in JPEG is achieved by distorting 8x8 block DCT coefficients through quantization. It has been shown in literature that DC block DCT coefficients are Gaussian probability distributed and AC block DCT coefficients are Generalized Normal probability distributed.
In this investigation, three probability density models for individual modes of non- quantized AC block DCT coefficients are evaluated and are used as basis for the derivation of probability distributions for quantized block DCT coefficients. The suitability of …
Power Flow In Railway Electrification Power System, 2010 New Jersey Institute of Technology
Power Flow In Railway Electrification Power System, Sisi Li
Theses
This thesis discusses aspects of the design of the railway electrification system (RES) and in particular the electric distribution system for a 2x25 kV railway power system.
The analysis of Railway Power Supplies (RPS) presents a unique type of load flow problem which is characterized by its constant moving loads, dynamically changing load types (constant current/constant power), and its specialized network structure. The autotransformer power supply system with double track was the system studied in this thesis.
The details of the system studied were provided by Caltrain (California Commuter Rail) for a planned high speed extension to Caltrain system. A …
Study Of Methods To Predict Voltage Collapse, 2010 New Jersey Institute of Technology
Study Of Methods To Predict Voltage Collapse, Niki Patel
Theses
One of the problems that must be addressed for a secure power system operation is the voltage collapse problem. The ever increasing size and connectivity of the power grid have lead to making the problem more multifarious. Widespread blackouts, similar to the one that occurred in the northeast in August 2003, could result from failure to address the problem.
This thesis presents an overview of the voltage collapse problem and reviews some existing methods to calculate voltage collapse indicators.
Thevenin and Maximum Power Transfer Theorems are used to provide indicators of the proximity of the system to voltage collapse. The …
Papr Reduction In Ofdm Communications With Generalized Discrete Fourier Transform, 2010 New Jersey Institute of Technology
Papr Reduction In Ofdm Communications With Generalized Discrete Fourier Transform, Sertac Sayin
Theses
The main advantage of Generalized Discrete Fourier Transform (GDFT) is its ability to design a wide selection of constant modulus orthogonal code sets, based on the desired performance metrics mimicking the engineering specs of interest. One of the main drawbacks of Orthogonal Frequency Division Multiplexing (OFDM) systems is the high Peak to Average Power Ratio (PAPR) value which is directly related to power consumption of the system. Discrete Fourier Transform (DFT) spread OFDM technology, also known as Single Carrier Frequency Division Multiple Access (SCFDMA), which has a lower PAPR value, is used for uplink channel.
In this thesis, the PAPR …
Very High Frequency Channel-Select Mems Filters Based On Self-Coupled Piezoelectric Aln Contour-Mode Resonators, 2010 University of Pennsylvania
Very High Frequency Channel-Select Mems Filters Based On Self-Coupled Piezoelectric Aln Contour-Mode Resonators, Chengjie Zuo, Nipun Sinha, Gianluca Piazza
Chengjie Zuo
This paper reports experimental results on single-chip multi-frequency channel-select filters based on self-coupled piezoelectric aluminum nitride (AlN) contour-mode microelectromechanical (MEMS) resonators. Two-port AlN contour-mode resonators are connected in series and electrically coupled using their intrinsic capacitance to realize multi-frequency (94–271 MHz), narrow bandwidth (~0.2%), low insertion loss (~2.3 dB), high off-band rejection (~60 dB) and high linearity (IIP3 ~100 dBmV) channel-select filters on the same chip. This technology enables multi-frequency, high-performance and small-form-factor filter arrays and makes a single-chip multi-band reconfigurable radio frequency (RF) solution possible in the near future.
High-Voltage Programmable Delta-Sigma Modulation Voltage-Control Circuit, 2010 Boise State University
High-Voltage Programmable Delta-Sigma Modulation Voltage-Control Circuit, Lucien Jan Bissey
Boise State University Theses and Dissertations
Modern memory semiconductors require different internal voltages to accomplish the myriad of tasks that are required for operation. These internal voltages are multiples of the external voltage that is applied to the part. This multiple can be greater than one, as is the case with voltage pumps, less than one, as in the case of regulated supplies, and negative, as in the case of negative charge pumps. All of these potentials require control and regulation to ensure proper operation of the die. The control of the supply ensures that the required potentials are available when the die needs it. The …