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Title:

Maximum Power Point Tracking System for Solar Racing Team

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Maximum Power Point Tracking System for Solar Racing Team Andrew Matteson Ingrid Rodriguez Travis Seagert Giancarlo Valentin April 25th , 2011 GT Solar Jackets – PowerPoint PPT presentation

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Title: Maximum Power Point Tracking System for Solar Racing Team


1
Maximum Power Point Tracking System for Solar
Racing Team
  • Andrew Matteson
  • Ingrid Rodriguez
  • Travis Seagert
  • Giancarlo Valentin

April 25th , 2011 GT Solar Jackets School of
Electrical and Computer Engineering Georgia
Institute of Technology
2
Project Overview
  • Customized smart switching power system to charge
    car batteries with solar energy
  • For use by the Solar Jackets in the World Solar
    Challenge 2011
  • Material cost 121 per unit

3
Design Goals
  • Implemented RS-485 communication interface
  • Complied with solar challenge regulations

Proposed Actual
2 MPPTs in 7 x 9 PCB 2 MPPTs in 6½ x 7½ PCB
gt 90 efficiency to be measured
Multiple PCBs One PCB
4
Design Overview
Solar Arrays
Battery
Serial Data Out
5
Maximum Power Extraction
Maximum Power Point P IV
Solar Cell I-V Characteristic
6
Smart Power Switching Circuit
PIC Microcontroller
7
Smart Switching Demonstration
Current
Voltage
8
RS-485 Protocol Implementation
  • This standard defines a physical layer
  • The protocol was defined by the team
  • This standard is responsible for communication
    between electrical systems in the car

9
Safety Precautions Fuses and Connectors
  • Over-current/voltage protection
  • Automotive fuse at input
  • Cylindrical fuse at output
  • Touch-safe connectors

Courtesy of Fall 2010 Solar Power Array
Management Group.
10
Safety Precautions Fuses and Connectors
Illustration
11
Safety Precautions Operational
Maximum Voltage Maximum Current
Input 18 V 9 A
Output 105 V 3.5 A
12
Safety Precautions Operational Demonstration
Tested software by giving it simulated inputs
that were out of range. Circuit shut down was
indicated by the LED.
13
Safety Precautions Zener Diodes
The Zener diodes provide paths for current to
flow in the event of an abrupt
disconnection.
14
PCB Size Changes
15
Efficiency Synchronous Rectifier
  • Circuit efficiency was improved by replacing
    standard components with more efficient
    alternatives
  • The standard diode was replaced by an ideal diode
  • The design accommodated both alternatives in the
    following way

16
Problems and Solutions
  • The holes on the PCB were drilled incorrectly
  • Drilled bigger size holes by hand
  • Traces were conducting and leaking current
  • Attempted to fix by hand, then determined it
    would be best to mill another PCB
  • Limited RAM on PIC
  • Space-conscious coding

17
Final Cost of Design
Components Units Unit Cost Total
Toroid Inductor 2 9.56 19.12
Ideal Diode Controller 2 3.40 10.20
Diodes (various) -- -- 15.30
Switches 3 5.75 17.25
PIC Microcontroller 1 4.32 4.32
Current Sensor 3 4.52 13.56
Connectors (various) -- -- 11.11
MOSFET 4 2.79 11.16
Oscillator 1 2.13 2.13
Miscellaneous Components -- -- 16.40
TOTAL 120.55
18
Deliverables
  • One working reproducible PCB
  • PCB layout files and schematics
  • Parts list
  • Source Code
  • RS 485 Protocol

19
Present Status
  • Testing PCB with solar array
  • Testing efficiency of ideal diode
  • Improving software robustness
  • Combining algorithm and RS-485 code

20
Questions
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