solar powered battery charger kevin mcdowall, joshua ivaldi, muhammad mustaqeem khatri, and alfredo...
TRANSCRIPT
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Solar Powered Battery Charger
Kevin McDowall, Joshua Ivaldi, Muhammad Mustaqeem Khatri, and Alfredo Elias
Department of Electrical and Computer Engineering
University of Connecticut
Advisor: Dr. Sung Yeul Park
Date 19 April 2013
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Motivation
Specifications
Buck Converter Topology
Sensors
Microcontroller
Algorithm
Design Details
Results
Cost
Conclusion
Questions
Outline
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Motivation
Decided to leave IFEC work and start new work on Solar Battery Charger for better design experience
Design topologies are similar so will help us in transition
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Buck Converter Topology
24V ≤ Vin ≤ 48V Vout < 13.8V Buck converter is a
step-down DC to DC converter
Therefore, buck converter topology was chosen
Block Diagram
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Sensors
Need sensors for feedback purposes The input voltage and current are monitored, as
is the output voltage and current. This is done with current sensors and
operational amplifier comparators.
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Microcontroller Board
The microcontroller chip is TMS320F28335, coded in C++.
The board monitors input current, input voltage, output current, output voltage and current battery charge.
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Control Algorithms
The control board is coded to operate three different algorithms; Constant Current, Constant Voltage and Maximum Power Point tracking.
Constant Current – The first stage of the charging process. Will charge battery to about 95% completion
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Constant Voltage
The second stage of the charging process. The battery is supplied 13V across its terminals until the full charge is reached.
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MPPT
Maximum Power Point Tracking (MPPT) – Sunlight conditions change, so there is need to constantly calculate maximum power available from PV panel
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Design details: Power Circuit Schematic
Isolator for signal transfer
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Design details: Voltage Supply Schematic
12 Volt Supply
5 Volt Supply
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Design details: Sensor Schematic
Current Sensor
Comparator
Comparator
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PCB Layout
• Altium Designer• 4 layers
• Top Layer• 5V Layer• 3.3V Layer• GND Layer
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Results
• Slight errors in sensor readings
• Modification required in the gate driver
• Able to run all algorithms successfully
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Board Cost
The total cost to produce the power board is: $162.06
Cost of control board: $102.80 The cost of a 220W solar panel is: ~$350
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Conclusion and Learning Experience
• We have achieved all specification and design requirements
• Learned:
• PV Model
• Battery Charging algorithms
• Design of schematic and PCB board
• Able to combine knowledge from courses such as microcontrollers, power electronics, and digital control systems
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Questions???