Optimizing DIY Wireless Charging Circuits for Beginners

[Lucas Dimoveo]

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.

 

[berkeman]

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.

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?

 

[Lucas Dimoveo]

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

 

[pantaz]

Try instructables.com -- Here's one example:
http://www.instructables.com/id/Wireless-Ipod-Charger/

 

[Lucas Dimoveo]

Thank you! We'll try it and get back to you.

 

[Lucas Dimoveo]

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?

 

[Enthalpy]

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).