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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. Our Product. The Concept:. Regenerative Brake System for Bicycles to Power LED Flashers and Headlight

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Cyc-light

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  1. Cyc-light Purple Team B Andrew Baines, Ian Collier, Ed Hsieh, Catherine Koveal, Jason Martinez, Monica Rush, Ben Smith, Timothy Suen, Jeremy Scholz

  2. Our Product

  3. 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

  4. 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

  5. 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)

  6. Physical Implementation Disengaged MotorEngaged Friction Brake and Motor Engaged

  7. 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

  8. Issues left to tackle: • Low Battery Warning • Theft Protection • Adaptability • Mountain Bike & Street Bike Implementation • Weatherproofing • Variable braking power • Lowering Costs

  9. Electronic Configuration LM2577 step-up voltage regulator

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