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Cyc-light. Purple Team B Andrew Baines, Ian Collier, Ed Hsieh, Catherine Koveal, Jason Martinez, Monica Rush, Ben Smith, Timothy Suen, Jeremy Scholz. Our Product. The Concept:. Regenerative Brake System for Bicycles to Power LED Flashers and Headlight

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Presentation Transcript
cyc light

Cyc-light

Purple Team B

Andrew Baines, Ian Collier,

Ed Hsieh, Catherine Koveal, Jason Martinez, Monica Rush, Ben Smith, Timothy Suen, Jeremy Scholz

the concept
The Concept:

Regenerative Brake System for Bicycles to Power LED Flashers and Headlight

  • 41% of Bicycle accidents happen at night, when the fewest people are biking.
  • Goal: Recharge batteries without impeding normal cycling motion
  • Normal energy dissipated in braking up to 1000 W compared to 3-4W to power LEDs
major issues
Major Issues
  • Electronics – Conversion of varied source voltage to constant voltage for charging battery
  • Configuration – Incorporation of existing bicycle components and geometry
  • Cost – Batteries are inexpensive & LED flashers use very little energy
  • Feathered Braking
  • Environmental Considerations – weather-proofing
motor selection
Motor Selection
  • Voltage – Speed (RPM) Curves
    • Typical operational speeds ~ up to 4600 rpm
    • Over-voltage  motor damage
    • Voltage regulator requirements (Ex. Vmin = 3.5 V)
  • Power Requirement
    • 30 sec of braking for

10 min of riding means

60 W collected during

braking

Ideal Voltage vs. Speed Curve

Vmax = 65 V

Kt = 0.014 V/rpm

Vmin = 3.5 V

wmax = 4600 rpm

(30 mph)

wmin = 250 rpm

(1.6 mph)

physical implementation
Physical Implementation

Disengaged

MotorEngaged

Friction Brake

and Motor Engaged

energy storage
Energy Storage
  • Charging circuit
    • Capacitor network quickly gathers energy during braking
    • Voltage is regulated to 5 V for 3 V + input
    • Switching Voltage Regulator is used for High Efficiency
  • Battery bank
    • NiMH batteries
    • 2 AA batteries sufficient for flashers and headlight
    • Energy gathered by capacitors is used to charge batteries
issues left to tackle
Issues left to tackle:
  • Low Battery Warning
  • Theft Protection
  • Adaptability
    • Mountain Bike & Street Bike Implementation
  • Weatherproofing
  • Variable braking power
  • Lowering Costs
electronic configuration
Electronic Configuration

LM2577 step-up voltage regulator

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