Date:10.30.18
Location: Logan HS
Time: 9:20-10:05 AM
Students: All in 3rd hour
DE class.
Goal: Discuss alternate methods to
harvest energy from walking movement.
Mike Wettstein was our guest speaker
today on the topic of alternate methods to harvest energy from motion. He
brought in some industrial piezo devices which vary in price from $15 up to
very expensive.
Piezo uses a wave form that is very
sporadic. He explained the importance of using a full wave rectifier and why
most charging systems for phones and other devices are called transformers when
they are really a power supply and bridge rectifier. You need the rectifier
because the AC wave from needs to be switched so it is positive and does not
drop negative. A capacitor is used to smooth out the waveform. He suggested we
use a charge controller to monitor the voltage from the rectifier.
A door bell system could also be used
which uses a push button to move a rod through a coil. No gears are used and
therefore no wear and tear. A linear solenoid used as a door opener could also
be used. We would need to switch it to charge the magnet on the inside instead
of the outside.
Piezoelectricity is the electric
charge that accumulates in
certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins)[1] in response to applied mechanical stress.
https://en.wikipedia.org/wiki/Piezoelectricity
Power generation with shoe
Site to purchase Piezo disks
“In sole generator”
Piezo battery charging system in a shoe
Full Wave rectifiers
Linear solenoid actuator
https://www.electronics-tutorials.ws/io/io_6.html
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| Example of linear solenoid |
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| Mike talking to the students on harvesting technologies. |
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| Mike brought in some commercial piezo components for the students to look at. |
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