Kyle Merkert ECE 791/792 Senior Design Project October 2009 – May 2010 Faculty Advisor: Dr. Wayne...
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Transcript of Kyle Merkert ECE 791/792 Senior Design Project October 2009 – May 2010 Faculty Advisor: Dr. Wayne...
![Page 1: Kyle Merkert ECE 791/792 Senior Design Project October 2009 – May 2010 Faculty Advisor: Dr. Wayne Smith.](https://reader030.fdocuments.net/reader030/viewer/2022033105/56649e365503460f94b2632f/html5/thumbnails/1.jpg)
MICROPROCESSOR CONTROLLED A.C.
INVERTER
Kyle Merkert
ECE 791/792 Senior Design Project
October 2009 – May 2010
Faculty Advisor: Dr. Wayne Smith
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Introduction
We depend on electricity but we use a system that often involves long distance distribution rather than localized power:
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Introduction
Power distribution as it is today isn’t always reliable.
![Page 4: Kyle Merkert ECE 791/792 Senior Design Project October 2009 – May 2010 Faculty Advisor: Dr. Wayne Smith.](https://reader030.fdocuments.net/reader030/viewer/2022033105/56649e365503460f94b2632f/html5/thumbnails/4.jpg)
Problem Statement
My solution is a high power inverter for producing a sine wave at 110V RMS from electricity stored in 12V batteries.
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Design Goals
At least 400 Watts Output Power Integrated Overload Protection Circuits Sine Wave Output with < 10% THD Smooth Switching Between Grid and Inverter Informs User of Errors and Warnings Able to Power Inductive Loads
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Design ConsiderationsStep up voltage before or after forming sine wave?
This implementation steps up voltage first, then uses a network of transistors to create a sine wave with this high voltage input.
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Design Considerations
This alternate implementation creates a sine wave with the 12 volt input and then steps up the voltage with a high power transformer.
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Design ConsiderationsSine wave production: Pulse Width Modulation (PWM) or Digital to Analog Conversion (DAC)?
PWM
DAC
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Implementing/Testing Plan1. Protective circuitry
2. Microprocessor programming for 60Hz sine wave output
3. Amplitude adjustment
4. Voltage step-up experimentation
5. Error reporting and increased current capabilities
6. Final user interface and load control
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Budget (High Estimate) Deep Cycle Batteries $200 High Voltage Capacitors $40 Power Transistors $50 Power Resistors $10 Misc. Parts as Needed $100 Unexpected Costs
(Damaged Parts, Etc.) $100
Total Cost (High Estimate): $500
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Design Goals By MonthNovember: Decide on PWM or DAC. Program sine wave output of microprocessor. Experiment with stepping up voltage and determine if sine
wave should be formed before or after voltage step-up.
December: Build protection circuits. Construct first prototype of inverter for very low load
conditions. Build amplitude regulation circuit. Program power monitoring of grid power. Complete progress Report
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Design Goals By MonthJanuary: Add error reporting circuits. Increase output power capabilities. Optimize THD of sine wave to resistive loads.
February: Maintain sine wave with inductive loads. Determine maximum safe output power. Program software to prevent loads from drawing too much
power.
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Design Goals By MonthMarch: Add user interface: Battery life and power usage monitoring.
April: Finish and optimize anything that does not meet design
goals. Prepare UNH-URC Poster Presentation
May: Have finished product completed Prepare and present final report