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DIY Wireless Charging Circuit

  1. Oct 9, 2012 #1
    Good Afternoon,

    I'd like to build a wireless charging circuit from scratch, but I am unsure of where to start. Every time I attempted the experiment the coils would not transfer power and I am unsure of what I am doing incorrectly. If anyone could point me to a resource for DIY wireless charging circuits I would be greatful.

    Thank you.
     
  2. jcsd
  3. Oct 9, 2012 #2

    berkeman

    User Avatar

    Staff: Mentor

    Welcome to the PF.

    Doing a Google search on the title of your thread brings up lots and lots of resources. What resources have you looked at so far?
     
  4. Oct 10, 2012 #3
    http://www.ehow.com/how_7566920_power-led-mutual-inductance.html

    My friends and I are following this tutorial to the letter, but we can't seem to transmit more than .07V

    Materials:
    * 12VAC Transformer
    * 5 Turn 3inch Diameter 22 Gauge Magnet Wire Receiving Coil
    * Various Transmitting coils - 14 gauge solid core/ 10 gauge stranded/ 22 gauge smaller diameter / 22 gauge higher diameter
     
  5. Oct 11, 2012 #4
  6. Oct 11, 2012 #5
    Thank you! We'll try it and get back to you.
     
  7. Oct 19, 2012 #6
    Does anyone know how to increase AC frequency? This has been driving me nuts for 3 days!
    I have a 12VAC 1.2A transformer letting out a 60Hz signal. I need it to oscillate at 60kHz. I don't have a frequency generator. are there any semi-simple circuits I can make to set the frequency using parts from radioshack?
     
  8. Oct 20, 2012 #7
    It's the page 2 of Pantaz' link:
    http://www.instructables.com/id/Wireless-Ipod-Charger/step2/The-Schematic/
    but this project is not exactly for a beginner.

    I'm surprised the author at instructables.com resonates the 3+3 turns transmitter coil with 2µF and the 3 turns receiver coil with 2µF as well. Unless both coils are very close to an other, the capacitances should be in factor 1:4. Further, resonance has to be adjusted a bit to obtain range.

    PVC insulated wire is less than optimum: at around 250kHz it creates big dielectric losses in the coils. Transformer wire is far better, and of course Litz wire even better (I suppose it's a translation mistake, we should say braided wire).
     
    Last edited: Oct 20, 2012
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