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Wireless power transmitter

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radhoo

Wed Jul 13 2011, 07:08PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699

A proof of concept that works surprisingly well. Nice range and good efficiency.

Circuit diagram:

Other details here:

Operating frequency : 63.1KHz

Xray

Mon Jul 18 2011, 06:30PM

Registered Member #3429 Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288

I built a similar project back in 1975. The idea goes back to the days of Nikola Tesla, and therefore it is nothing new. Some companies that make portable electronic gagets (such as cell phones and cordless toothbrushes) are just now starting to utilize this scheme for recharging their devices without using an electrical contact of any kind.

radhoo

Mon Jul 18 2011, 08:31PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699

yes, tesla did this using spark gap oscillators, like in the early radio transmitters. I never said it was something new, but since I completed another project I thought it was a good idea to share it with the community. Bet tesla's design wasn't this compact :)

haxor5354

Mon Jul 18 2011, 08:51PM

Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352

the only problem with this technology is that the reciver have to very close to the transmitter. the recived power prabably follows the inverse square law.

Inducktion

Mon Jul 18 2011, 09:34PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

What if you up the frequency? ._.

Xray

Tue Jul 19 2011, 04:35AM

Registered Member #3429 Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288

radhoo wrote ...

yes, tesla did this using spark gap oscillators, like in the early radio transmitters. I never said it was something new, but since I completed another project I thought it was a good idea to share it with the community. Bet tesla's design wasn't this compact :)

I agree, this is a great project for electronic hobbyists, and you have given a good example of how it can be constructed. You did a nice job, and it looks professionally assembled.

Many years ago, I wanted to make a wireless headphone that would allow me to walk around my house while listening to an audio source that originated in my basement. I first tried the transformer technique by winding a VERY large primary coil around the entire perimeter of my basement ceiling, and the headphones were connected to a secondary coil that I carried on my belt. The unit was a little clumsy because of its size but it did work. But some time later I used the tuned circuit technique like you did in your project, and it was much smaller than my first attempt, and the secondary coil was also much smaller and easier to lug around. The circuitry was more complex than the simple transformer technique of coupling, but overall it was much better. In my case, I wasn't transmitting power to light a bulb or charge a battery, but I was transmitting modulated power, not unlike a standard AM radio transmitter. I used a carrier frequency of around 500KHz.

Patrick

Tue Jul 19 2011, 04:38AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Radoo what program did you use to make the schematic?

ZakWolf

Tue Jul 19 2011, 05:16AM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608

any one try this one, looks fairly descent.

Patrick

Tue Jul 19 2011, 05:24AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

SublimeVolts wrote ...

any one try this one, looks fairly descent.

I meant the graphics part of his schematics pics (his look like steve wards) ... not the component values or connections.

radhoo

Tue Jul 19 2011, 02:27PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699

Thanks for the feedback, guys, I was about to think you're all away on some exotic holidays, drinking cocktails and having fun

@haxor5354: all electromagnetic waves (radio, light, X-rays, etc.) obey the inverse-square law. so yes, distance can be a problem.
@Inducktion: I believe that would increase the power density. I can change the capacitor to increase the frequency.
@Xray: actually there is an easy way around that, probably you've all seen self-powered little radios using just a few components. would love to see your project, but since it was long ago, you probably don't have any pics.
@Patrick: I used ExpressSCH . It comes in a bundle with ExpressPCB

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