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Thermal Energy Battery Charger

Thermal Energy Battery Charger. Group 25 Christina Poon Ainur Smailova Spring 2010. Introduction. What Are We Making? What Does It Do? What Can You Use It For?. Overview. Solar Collector Array. Design Considerations. 22.5” Fresnel lens 28” focal length Max temp. = 565F

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Thermal Energy Battery Charger

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  1. Thermal Energy Battery Charger Group 25 Christina Poon Ainur Smailova Spring 2010

  2. Introduction • What Are We Making? • What Does It Do? • What Can You Use It For?

  3. Overview

  4. Solar Collector Array

  5. Design Considerations • 22.5” Fresnel lens • 28” focal length • Max temp. = 565F • Adjustable tilt angle • Normal to sun • Tripod

  6. TEG System

  7. Thermoelectric Generator Module • VT-127-1.4-1.5-71 • Max Temp: 392F • Max diff: 176F

  8. Testing/Verification

  9. Efficiency 6%

  10. Optimization • Heat Transfer Blocks • Black anodized aluminum • Bare aluminum • Heat Sink • Aluminum stampings • Water bin • Efficiency: .49%

  11. Boost Converter

  12. Zetex ZXLB1600 • Input voltage range: 1.6 – 5.5V • Adjustable output up to 28V • Voltage adjustment by external resistors • Cheap • Reliable • Minimal parts required • 80% efficiency

  13. Boost Converter Schematic

  14. Testing/Verification Min input = 1.4V Max input = 5.5V

  15. PIC-Based Battery Charger Circuit

  16. Components • Input voltage: 2.0-5.5V • LM317 – Current regulator • Maintains 1.2V

  17. Current Optimization 93.35 mA 89.37 mA On

  18. PIC-based Battery Charging Circuit Schematic

  19. DS2715 Charge Controller

  20. DS2715 Charge Controller Schematic

  21. DS2715 • Charges 1 to 10 NiMH cells • Regulates current through linear control • Adjustable charging time • Safety regulations: over-temperature, over-voltage protection • Time-out selection

  22. Testing – Current Regulation Min. output current

  23. DS2715 vs. PIC16C711 • Load current • Input voltage threshold • Price

  24. Successes • Met design goals • Reliable charging current • 89.3mA → 22.4hrs • Boost converter outputs reliable value • 2.2% tolerance • TEG system produces adequate power to meet circuit needs

  25. Further Improvements • Improved power generation • Multiple modules • Running water • Heat storage • Container to prevent radiation from heat transfer block • Could charge multiple/larger batteries with enough power

  26. Acknowledgements • ECE Machine Shop (Scott McDonald, David Switzer, Greg Bennet) • ECE Parts Shop (Mark Smart) • Power Lab (Kevin Colravy) • Tom Galvin • Prof. Paul S. Carney

  27. Questions?

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