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# Shake cell phone charger

Shake cell phone charger. Prototype Presentation Group 6. Overview. Need : A portable cell phone charger that does not require the constant purchase of batteries or access to a fixed sort of energy.

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## Shake cell phone charger

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1. Shake cell phone charger Prototype Presentation Group 6

2. Overview • Need: A portable cell phone charger that does not require the constant purchase of batteries or access to a fixed sort of energy. • Solution: Harnessing the electromotive force that is generated by magnetic flux when magnets are moved within a copper coil by the walking motion of any person. This can be done by creating a device that is small enough to fit within a pocket or purse and would be sensitive to the movements of that person. The device would feature some sort of track that is lined with copper coils that a magnet would follow through the motions of everyday life. EMF that is generated by the constantly changing magnetic flux would then be stored within a capacitor so that it could be used as an energy source for a cell phone while away from a fixed source of energy like an outlet.

3. Faraday’s law Image Source: http://wikipremed.com/01physicscards600/379a.gif

4. Circuitry We will be required to output a minimum of 4 -6 Volts through our capacitor for adequate charging. The natural discharge response of a capacitor (in t-domain) with: Capacitance (C), Resistance [in wires] is: K e^(-t/RC) OR discharge rate depends on RC time constant: Higher Capacitance/Resistance the longer it takes to discharge

5. Anticipated challenges • Determining the most effective arrangement in terms of maximizing voltage. • Finding the strongest magnet in the shape required to operate in this arrangement. • Settling trade off between voltage and device size. • Producing enough voltage to charge a cell phone. Image Source: http://www.radioelectronicschool.net/files/downloads/faradyanim.gif

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