Piezoelectricity generator for mobile charging

Discussion in 'The Projects Forum' started by So Man Kit, Sep 1, 2016.

  1. So Man Kit

    Thread Starter New Member

    Sep 1, 2016
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    Hi, I did a lot of research about the charging technic using piezoelectic energy from vibration. However, I need to do a project of it and I do not know how I can choose a suitable piezoelectic element for the project and design the protection circuit of it.

    Expected type of piezoelectric element : polymer(because I want to scavenge the vibration energy.)
    Circuit design : Can I use other IC such as liner regulator or Battery management IC for the project?
     
  2. DickCappels

    Moderator

    Aug 21, 2008
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    So Man Kit likes this.
  3. So Man Kit

    Thread Starter New Member

    Sep 1, 2016
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    Would you suggest me to buy a piezoelectic produc from other companies such as Sparkfun? And then give a deep development of it?
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    What is the vibration source? Unless it is a high power one I think you'll be disappointed as to how long it would take to charge a phone battery. Start by finding out the vibration power and doing the maths.
     
  5. DickCappels

    Moderator

    Aug 21, 2008
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    What is it that you want to achieve?
     
  6. tcmtech

    Well-Known Member

    Nov 4, 2013
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    Do some reading on their application and overall energy outputs.

    You will likely change your mind rather quickly when you see you would need a piezoelectric element the size of king size bedsheet flying like a flag in a 30 MPH wind to generate enough power to charge a typical cell phone at a reasonable rate. :(
     
  7. DickCappels

    Moderator

    Aug 21, 2008
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    This reminds me of the Self-Winding watches of several decades ago. What a convenience, we thought, but of course you had to rotate you wrist continuously for a minute or two every day. Where are the self-winding watches today?
     
  8. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    The watches have made a comeback, especially refurb older models, and several men's gifts catalogs have watch-winding stands. You put your watch on it at night, and it is fully wound in the morning. Variable speed of oscillation, timer to prevent over-winding, larger models to wind several watches at once, $$$.

    ak
     
  9. ian field

    Distinguished Member

    Oct 27, 2012
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    One UK supermarket was going on about energy harvesting by paving their car park with piezo tiles.

    AFAIK: the idea sank without trace - I never heard anymore about it.

    There is such thing as a piezo transformer - but I think its more of a signal thing for high voltage isolation. There are various such devices like opto-couplers with the LED & PD separated by a length of fibre-optic cable.

    There may be piezo transformers to isolate and supply LP devices, but charging a mobile could take a while.
     
  10. tcmtech

    Well-Known Member

    Nov 4, 2013
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    I had one as a kid and if a person carried on in a normal level of activity in a day the thing worked great. However for a person who sat on their butt all the time they were known to be pretty useless. (likely much like the wearer)
     
    Alec_t likes this.
  11. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    A couple of years ago there were stories about piezo generators under the floor of the entrance to a shopping mall. Again, no mention since, but that seemed like a more reasonable starting point.

    ak
     
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