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Smart Charger with Wind Turbine

Smart Charger with Wind Turbine. Ahmed Cheta Kirsten Dearnley Paul Mikols. Lead Acid Charging. Turbine. Alternate Battery Charging. HAWT Pro: - Can reach strong winds high up - More portable Con: - Requires small size motor -  Hard to mount upright. VAWT Pro:

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Smart Charger with Wind Turbine

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  1. Smart Charger with Wind Turbine Ahmed ChetaKirsten DearnleyPaul Mikols

  2. Lead Acid Charging Turbine Alternate Battery Charging

  3. HAWT Pro: - Can reach strong winds high up - More portable Con: - Requires small size motor -  Hard to mount upright VAWT Pro: - Can use a large/heavy motor - More Stable Con: - Winds must be strong at ground level - Not easily moved/collapsed Winner: HAWT - Illinois wind is not reliable at ground level - Ease of portability

  4. Motor • HAWT requires light weight • DC Motor has low torque, high rated voltage, low rpm rating • Used treadmill motor provides us with a cheap, lightweight motor

  5. Blades - Cheap and readily available PVC construction - 3ft. long blades - Made of quartered 3" pipe

  6. Gear Box Gear Ration Chosen= 1:2

  7. Stand - Cheap and readily available PVC construction - Can be staked or held down by sandbags -  Tail keeps blades faced into wind

  8. Linear relationship between voltage and rpm: V = (.8/50)*rpm - 0.1 The plot of Rpm vs Wind Speed has the same shape

  9. PWind = 0.5 * (Density of air) * A * V2

  10. Power measured across a 100 Ohm resistor

  11. Betz limit : 59.3% Max Efficiency (Proven) GGS limit : 30.1% Max Efficiency (Predicted)

  12. Outputs-120AC, USB • PowerBright PW400-12 • Met our spec in proposal of providing 400watts AC • Built in 5V USB out

  13. LA Battery • A typical LA battery for a car (when fully charged) would be able to run the 400W adapter for ~ 2.5 hours at full capacity. • This will provide enough energy to meet the needs of the proposed project.

  14. PIC Programming and Charging Algorithms • PIC 16F877A • Specifications: • 5 Volts maximum input • 8 analog inputs • Digital I/O

  15. PIC Programming and Charging Algorithms • PIC 16F877A • Specifications: • 5 Volts maximum input • 8analog inputs • Digital I/O

  16. PIC Programming and Charging Algorithms • PIC 16F877A • Specifications: • 5 Volts maximum input • 8 analog inputs • Digital I/O

  17. Lead Acid Charging • Constant Current • Charge Current = 1/10 of capacity (3.6 Amps) • Termination: lead-acid voltage = 13.8V • Constant Voltage I • Voltage = 13.8V • Termination: charge current = 0.4Amps • Constant Voltage II • Voltage = 13.2V • Float charging

  18. Alternate Charging • Turned on at 12.4V • Controlled via PIC signal to relay • Currently provides the following: • AC/USB outputs • NiMH charging

  19. NiMH Charging • Two constant current stages: • 1C (2.3 Amps) • Termination: dT = 0.5 Celsius/minute • Maximum time = 90 minutes • 0.025C (58 mAmps) • Termination: 60 minutes • Temperature range: 5 < T < 40 • BJT implemented current sources • Temperature read via thermistor

  20. NiMH Charging • Two constant current stages: • 1C (2.3 Amps) • Termination: dT = 0.5 Celsius/minute • Maximum time = 90 minutes • 0.025C (58 mAmps) • Termination: 60 minutes • Temperature range: 5 < T < 40 • BJT implemented current sources • Temperature read via thermistor

  21. NiMH Charging • Two constant current stages: • 1C (2.3 Amps) • Termination: dT = 0.5 Celsius/minute • Maximum time = 90 minutes • 0.025C (58 mAmps) • Termination: 60 minutes • Temperature range: 5 < T < 40 • BJT implemented current sources • Temperature read via thermistor

  22. Printed Circuit Board (PCB) • Used Eagle Software to design and layout • Challenges that were unique to our project: • 3 Voltage levels on 1 board • High currents (for a PCB)

  23. Future Recommendations • Motor choice • AC • More alternate batteries • Collapsible Design • Weatherproof

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