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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 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 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 – weatherproofing 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) Ideal Voltage vs. Speed Curve Vmax = 65 V Power Requirement – 30 sec of braking for 10 min of riding means 60 W collected during braking V = 3.5 V Kt = 0.014 V/rpm min wmin = 250 rpm (1.6 mph) wmax = 4600 rpm (30 mph) Physical Implementation Disengaged Motor Engaged Friction Brake and Motor Engaged 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: Low Battery Warning Theft Protection Adaptability – Mountain Bike & Street Bike Implementation Weatherproofing Variable braking power Lowering Costs Electronic Configuration LM2577 step-up voltage regulator