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EE 4400 – Project Idea

EE 4400 – Project Idea. By: Shat Pratoomratana. Motivation. Most of us use mobile electronic devices that need to be charged. Many times our batteries run low when we need them the most. If you are without a charger and not near a power outlet you don’t have many options.

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EE 4400 – Project Idea

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  1. EE 4400 – Project Idea By: Shat Pratoomratana

  2. Motivation • Most of us use mobile electronic devices that need to be charged. • Many times our batteries run low when we need them the most. • If you are without a charger and not near a power outlet you don’t have many options. • Wouldn’t it be nice if you could charge your USB mobile device simply by walking?

  3. Proposal • I propose to build a device that would use piezoelectric materials inserted into the sole of a shoe that would produce a current with every step. This would be used to charge a rechargeable battery that could been discharged through a USB charging circuit to charge portable USB devices.

  4. Piezoelectricity • Piezoelectric crystals produce a voltage when stressed and this energy can be collected.

  5. Harvest current produced by piezoelectric element. (Capacitor banks?) Generate voltage by stepping on piezoelectric element. Use harvested energy to charge a rechargeable battery by building charging circuit. Discharge battery through a USB charging circuit to charge USB devices.

  6. Considerations • Type of piezoelectric material to use. • Voltage and current produced by piezoelectric material. • Ways to gather energy produced. • Type of rechargeable battery (NiCd, NiMH…) • Type of charging circuit (fast, slow) • Over charge protection. • USB charging. • Small circuits to fit on or in a shoe.

  7. Thank You • Questions?

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