Power and Energy Commons^™

Constant Conduction Angle Experimental Generation For Rf Power Amplifiers, Michael Spahn

Electrical Engineering

As the demand for more devices to become wireless increases, there is a need for linear, efficient monolithic power amplifiers to deal with the variations in modulation of signals. With partial support from Cal Poly C3RP Grant #52268, this paper explains the implementation of and analyzes a circuit that actively biases a bipolar transistor to operate as a Class C amplifier. The Class C amplifier can maintain constant conduction angle over a range of output powers by using a Class B amplifier to force a scaled DC current vs. input magnitude curve on to a Class C amplifier. The knee …

Wireless Passive Power Transfer Using Wire Antennas, Sheng Da Zhang

Electrical Engineering

This project tests and analyzes the efficiency of directional and omnidirectional antennas in wireless power transfer for charging. The project demonstrates the steps of construction and properties of dipole, monopole, and Yagi Uda antennas. A low power high frequency DC rectifier circuit converts the received RF power from the antenna and stored it as DC voltage on a capacitor. The receiver circuit also estimates the power received by the antenna. Wireless RF power transmission proves to be inefficient for short distances. The best efficiencies of the antennas were under 50% even at 0.1meter. The near field attenuation starts at around …

140 New Montgomery Power Distribution Design, Stephen Shaffer

Electrical Engineering

The Power Distribution Design for a high-rise building requires a great deal of coordination and design from the structural, electrical, mechanical, telecommunication, and PG&E engineers. This report will cover how I was able to coordinate and design the power distribution system for 140 New Montgomery, a 28 story building located in San Francisco. Furthermore, this report will cover the steps taken in the future to ensure a smooth transition from the schematic design phase to the construction document phase.

Portable Solar Desalination System, Genaro Sanchez, Alan Galarza, Erick Del Real

Electrical Engineering

Clean water and reliable energy can be difficult to obtain in remote locations such as desert villages, secluded islands, and other places where no fresh water can be found. The primary goal for this project is address these problems by implementing a portable desalinization plant system that is to be powered by solar energy PV system as the main energy source.

Sick Laser Scanner Power Supply For Use With A Yamaha Rmax Uav, Elliot Due

Electrical Engineering

No abstract provided.

60 Watt Embedded Solar Cell Umbrella, Matthew Devoss

Electrical Engineering

No abstract provided.

Cal Poly Power System Design & Analysis, Minesh D. Patel

Electrical Engineering

The scope of this project encompasses the design and analysis of the Cal Poly Power System at the distribution level using the SKM software environment. The purpose is to accurately model the power system in software so theoretical calculations and analysis can be executed. This requires sufficient preliminary research to obtain data for the main buildings on campus, sound interpretation of one line diagrams, designing the system within the software using realistic values and then performing analysis to model real world situations. The data collected is under maximum load conditions for a specified time period using medium voltage parameters. The …

Programmable Household Led Light Fixture, Jordan Locano

Electrical Engineering

This report details the development and construction of a LED light fixture to be used for household lighting. This document details background information, design ideas, project specifications, production, assembly, testing, and conclusions involved with this project. The goals of this project is to design and build a cost-effective replacement for traditional room lighting that can perform better and last longer than traditional methods.

Development Of Wind Tunnel For Laboratory Wind Turbine Testing, Danny Alexander Zepeda

Electrical Engineering

A wind tunnel with a 0.5 HP motor was purchased by Cal Poly Electrical Engineering Department from Hampden for $16,000. It can only simulate winds of up to 10 MPH. The tunnel has a manual dial that controls the wind speed. It also measures the voltage and current output with an analog measure display. This wind tunnel was expensive and unfortunately cannot achieve very high wind speeds. For this reason, a similar wind tunnel with more potential and with a smaller budget was proposed to be built for use in the Sustainable Energy Lab. The new wind tunnel that was …

Solar Powered Electric Clothes Dryer, Roger Mai, Alan Swe

Electrical Engineering

Appliances that consume the most energy in a household usually involve heating, and an electric clothes dryer is one such appliance, consuming up to 4KW of power. The most environmentally friendly way is to hang clothes outside to dry, a natural solar and wind powered method, but unfortunately most people are unable to do so as some neighborhood communities do not allow the hanging of laundry outside as it is regarded as “unsightly”, for example. This project aims to provide an alternate solution to the wall-powered electric clothes dryer by designing one which operates entirely off the grid.

Current Tracking Power Supply For Sensor Calibration, Joshua Brookley

Electrical Engineering

This report highlights the steps taken to design and develop a constant 5V power supply capable of tracking load current. The background of its previous design, its necessary specifications and steps taken to achieve specifications are highlighted throughout the report. The report also contains conclusions and final recommendations for the design chosen, including its strengths and drawbacks.

Imu Integration To The Cal Poly Spacecraft Attitude Dynamics Simulator Power System, Wayland Chan

Electrical Engineering

The Cal Poly Spacecraft Attitude Dynamics Simulator mimics the rotation dynamics of a spacecraft in orbit and acts as a test bed for spacecraft attitude control system development and demonstration. Prior to this project, the simulator measured its attitude dynamics from a total of seven sensors mounted on to the platform, including three micro-electromechanical system (MEMs) gyroscopes, and four motor encoders. This project entails the installation of an LN-200 high performance gyroscope, which will provide a greater measure of accuracy. The goal of this project is to design a power circuit that will integrate the LN-200 inertial measurement unit onto …

Wind Power Generator Design For The Dc House Project, Evan Lim, Samson Liu

Electrical Engineering

The purpose of this project is to introduce a cost efficient alternative in converting wind into energy for third world countries. Currently there are approximately 1.6 billion people who have limited access to electricity. As part of the DC House project, we hope to develop a solution for them as the use of electricity is becoming an essential part of life. One of the natural energy resources to provide power to the DC House is wind. The components used for the project are a DC motor and DC-DC converter to translate wind into power and produce DC voltage and current, …

Variable Dc Voltage Wall Outlet For The Dc House Project, Michael Detmers, Tyler J. Blauvelt

Electrical Engineering

This senior project report will focus on explaining the design and operation of a variable DC wall outlet for use in the DC house. Testing will include the use of various loads using different input DC voltages not exceeding a maximum output of 90W.

The most important aspects of the outlet are to have a highly-efficient converter efficiency as well as system isolation from the main DC bus on the input. This report will outline the purpose and way of achieving isolation through use of a Flyback DC-DC converter. The user interface is the second significant aspect and details of …

Bicycle-Powered Ac Generator, Andrew Austin

Electrical Engineering

The purpose of this senior project is to design, build, and be able to present a mechanism that will produce AC power using the mechanical energy produced by a person pedaling a standard bicycle. Also, I would like to be able to show the user and the audience the advantage of using compact fluorescent bulbs, and in doing so, make them more conscience of energy-saving products. To do this, I must present a stand that can support a bicycle with a rider, a way to convert the wheel’s motion to DC power, to convert that DC power to usable AC …

Solar Instrumentation Lab, Rene Canedo Iii, Rong Gui Chen

Electrical Engineering

This project is a mobile platform that will allow experiments on different solar panels to be done easily while keeping the cost of the lab to a minimum. California Polytechnic State University’s motto is ‘learn by doing’ and this lab structure will allow students to get practical experience with photovoltaic cells and the instruments that are required to take measurements. The solar instrumentation lab is a potential hardware lab for the electrical engineering department’s Sustainable Electric Energy Conversion class EE 420 and Solar-Photovoltaic Systems Design EE 520. This group took the current solar structure as a base for the lab’s …

Exercise Bicycle Dc-Dc Converter For The Energy Harvesting From Exercise Machines Project, Ryan Rickard, Logan Stowe

Electrical Engineering

Project is a continuation of previous projects that seek an efficient DC to DC converter for the existing exercise bicycle system created by Mechanical and Electrical Engineering students. This DC-DC converter is to integrate with the wide range of DC voltages produced by the bicycle in order to produce a constant optimal voltage for charging a car battery. This converter will boost voltages when the bicycle outputs below the optimal voltage and buck voltages when above. The converter will take EHFEM one step closer to its overall and final goal of harvesting energy from the exercise machines in Cal Poly’s …

Solar Powered Backpack, Saagar Sabharwal, Tom Poonsopin

Electrical Engineering

One popular motto in electrical engineering today is “going green.” This project will convert the sun’s energy into reusable energy. The purpose of this senior project is to develop a solar powered backpack that can charge certain portable USB devices for students. Many students walk around campus with an iPod or cell phone, which has surely died or ran low on batteries at least once when needed most. This backpack will allow students to charge their devices “on the go.” When students walk or bike around campus, the solar panels attached to the backpack will allow recharging of their portable …

Brushless Dc Motor Design And Build, Justin Damele

Electrical Engineering

Complete Design and Build of a Brushless DC Motor. Everything was manufactured using various Lathes and End Mills. Everything built from scratch.

Android Application Controlled Surge Protector, Lok An

Electrical Engineering

A significant amount of consumer electronics cannot be switched off completely without being unplugged. Standby power, also known as phantom power, refers to the electric power consumed by electronic appliances when they are switched off. There are some devices that need constant power; items like alarm clocks and security systems need constant power to function correctly. Some devices, such as video game consoles and televisions, consume power without offering any features. Electricity lost from standby power has been increasing with the amount of consumer electronics increasing in households.

This project’s goal is to create a low power remote that can …

Wireless Sensor Network For Energy And Environmental Monitoring: Helping Old Buildings Go Green, Jacob Power

Electrical Engineering

Today, the rising cost of energy and social trend of “going green” has put increasing pressure on commercial property owners to improve the efficiency of their investments. There is good reason for this, too. In the State of California, office buildings represent the single largest user of energy in the commercial sector. This project consisted of the design, implementation, construction, testing, and deployment of a wireless sensor network for energy and environmental monitoring in retrofit commercial office installations. The analyzed data generated by this system can be used by building management and owners to identify areas of inefficiency within the …

Dc House Modeling And System Design, Jessica E. Chaidez

Electrical Engineering

This project entails the study and design of DC power distribution for the DC House Project. Wire size, common high efficient loads, maximum power input, and different distribution system implementation (ring or radial) play a major role when designing an efficient, low-voltage distribution system. Efficiency is determined based on which main bus voltage powers all the loads with minimal power loss. Power efficiency is heavily dependent in DC-DC converter efficiencies due to the power loss in converting the voltage from high to low, or vice versa. Selection of the wire size plays a major role in power losses. There are …

Design Strategy For A 3-Phase Variable Frequency Drive (Vfd), Omar David Munoz

Electrical Engineering

This paper describes the design processes for a 3-Phase Variable Frequency Drive (VFD) as broken up into two stages: The AC-DC converter and the DC-AC converter. It acknowledges three (3) design versions, all. The output of the motor drive is 3-phase pulse width modulation (PWM) ranging in possible operation frequencies from 0Hz to 13kHz. The frequency control circuit uses an Arduino Uno based of the ATMEGA 328p.

Design And Simulation Of V2g Bidirectional Inverter And Dc-Dc Converter, Allan Agatep, Mason Ung

Electrical Engineering

As plug-in hybrid electric vehicles (PHEV) become more popular, the utility companies are forced to feed the grid more electricity. However, these PHEVs are capable of providing power to the grid when they are parked serving as ancillary systems for grid regulation (V2G). Using a system based on photovoltaic (PV) technology, a design for a bidirectional inverter with LCL filter, and a bidirectional dc-dc with a constant current controller, was constructed using LTspice. Various papers were researched and analyzed to determine applicable designs for components. Simulations show the designs are capable of bidirectional power transfer. ETAP simulations show that delivering …

Elliptical Machine Dc-Dc Converter For The Energy Harvesting From Exercise Machines Project, Greg Hollister

Electrical Engineering

Designing a DC/DC Converter for the Cal Poly Energy Harvesting from Exercise Machines project requires special attention to the unique operating characteristics of the source and the load. An elliptical machine powered by a person exercising comprises the source, while an AC Inverter makes up the load. This project attempts to integrate the two devices with a custom DC/DC Converter in order to ultimately deliver power back into the power grid.

Off-Grid Photovoltaic System Design Project, Brian Duffy

Electrical Engineering

This project uses the BP SX 150S solar panel to charge a 12 V battery. This battery powers an AIMS 400 W Modified Sine Wave Inverter to provide 120 V RMS AC power to a load of up to 40 W. Inverter efficiency was measured at different load conditions. A control circuit was implemented to prevent overcharging or over-discharging of the battery, by disconnecting it from the panel or the load, respectively. The control circuit turn-on and cutoff voltages were measured versus battery voltage, and the on-resistance of the MOSFET switches was measured for various load currents. A table of …

Hydro-Electric Generation System For The Dc House Project, Dennis Kwan, Mitchell Krug

Electrical Engineering

This paper focuses on the design, integration, and construction of a system that harnesses energy from flowing water. The system will be used in conjunction with the DC House Project. The proposed system employs a DC generator and DC-DC Boost-converter to provide electricity to the DC House at approximately 200-300W. Results of the testing and measurement show that the goal of the system is feasible, but currently limited. The generator could not output the specified power. Details of the design, along with ideas for further improvement, are presented in this report.

Wireless Energy Transfer, Ryan Sasur

Electrical Engineering

Phones are now an integral component in the daily lives of people. Smartphones give access to movies, internet, and even books. This versatility and increased use can also lead to a shorter battery life. A phone with video viewing capabilities will be a heavy load on the unit’s battery. With phones utilizing 3G and 4G technology, even heavier demands are placed on the battery. As technology improves even further to provide for a larger entertainment experience on the phone, this could also lead to further battery degradation if the current battery situation isn’t addressed. To have a fully operational phone …