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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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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

Our Product


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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