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ME 492 Fall 2008 – A Bicycle-Powered Cell Phone Charging System Bryan Brockert, Ahmad Sahib, Alex Galvan, Lenardo Burton, Alex Todoroski, Crystal Toporek Voltage rectifier/regulator circuit. 4 120-farad supercapacitors. AC to DC converter The finished waterproof container for the capacitors and circuit. Voltage Regulator DC Voltage Desired Voltage AC Voltage Intermediate Storage Device Bike Generator Basta/Union 6v, 3W wheel dynamo. Goals Cell Phone One of the cellular phones used for testing. -Harnesses a standard bicycle instead of using grid electricity or burning fuel. -Provides enough power to charge a cell phone in under 8 hours. -Remains lightweight, portable, and easy to use. Design/Implementation and Results -System uses a Basta/Union wheel dynamo to generate electricity on the principal of Faraday’s Law. -A purpose-built integrated circuit converts the voltage from AC to DC and attenuates the generated voltage. The dynamo mounted to a bicycle on a stationary “trainer” for testing. -Charge is stored in 4 supercapacitors, which are housed in a waterproof, bike-mountable container. -A “universal” output allows the connection and charging of practically any cellular phone. -In order to charge the capacitors enough to charge a standard cell phone battery, a user only has to ride the bicycle 15 miles. -On a full charge, the capacitors provide 2.5-3 hours of charge time. The finished product before final packaging.