Wireless Powering of LEDs via Resonant Inductive Coupling

[myname5876]

How are you able to set the frequency they are at?

[TeenageIronman]

This has been done many times before, you're not special, you're not smart, you're just stupid.

[vik95170]

Realy good. Many efficiany ( / 100) ?

[takerudarkkabuto]

I was building a project on this too. I am using a 22 wire gauge copper coil and fixed both primary and secondary coil with 50 turns. I set the frequency of 500-2Mhz.

the secondary coil was unable to receive any voltage. why is this happening?

[HorizonDelta]

Cool ! Watch also Tesla tech vids by HorizonDelta ;-)

[RomeoDLN1]

Great video! Have you ever done something similar with a Robin Coil? They are pretty interesting in the way they focus energy into the center of the coils. Thanks for the video.

[yeyryt1]

hello...what type of wires did u use?

i noticed the wires in the video are thicker..

thank u very much!

[franzduo]

where can i found the part used in this witricity circuits?...pls do help me....thanks...

[franzduo]

where can i found the part used in this experiment pls do help me...like ur video...thanks

[kvtgmc]

what is the value of capacitor n SWG of wire

[steamrolledboy]

we have the same function generator

[mehranmemnai]

Where i can find the shematic diagram of circuit?

[joebro391]

I'm very interested in building a similar coupling. I'm pretty keen to what's going on, but how do you determine what AC frequency to use?? Is there a formula you used, or was it mostly trial and error? I ask because I don't have a cool AC power supply and need to get the secondary coil right, based on a constant AC frequency. Thanks for the vid and any help you can provide. -Joe

[eachy74]

hey, just a question, how many turns does the wire have to have for the large and small resonant coils?

[gonepishing]

what if you changed the frequency according to the position of the receiving coil?

[theonlybluecow]

could you have the receiver spliced to the tip of a cellphone charger, and use this to wirelessly charge your cellphone?

[md5fungi]

I am curious to know how the LED and capacitor are hooked up to the receiving coil.

[uniment]

Is this taking advantage of evanescent wave coupling/tunneling?

[uniment]

Nice vid. Any reason for the specific coil sizes?

[Homestarbenner]

It was our goal to deliver power from a single large coil to multiple small coils with diameters on the order of 1cm.

Other than that, not really...

[SASNIGHTCRAWLER]

@Homestarbenner Amazing...so in other words, you are using MHz radio frequency waves to transferee amplified AC energy to a wide band receiver in the device which transferee's this back into usable AC energy the device can run on?

[SASNIGHTCRAWLER]

@Homestarbenner i suppose each internal receiver will have to be tailored for the device in question? maybe in time, most if not all equipment, will run on such technology.One more thing, the drain from source, will this be effected or can it overload from too many devices in the area at the same time?

[KTPSP]

all he needs to do is get some better wire (Magnet wire) and make a bigger coil to receive and create the EM field.

I'm making one today its not that hard

[robotkid249]

What kind of capacitor is that in the receiver circuit?

[robotkid249]

Is that function generator set for DC or AC power?

[Homestarbenner]

It's AC.

You can see on the LCD screen the frequencies that were used (around 8.3MHz)

[delphi7691]

You can connect the source directly to the 30 cm large resonant coil by having in between the source and the coil a matching network constutueted of one series capacitor Cs and one parallel capacitor Cp. Cp sets the coil resonance. Tune Cs while monitoring s11 of the matching networs connecgted to the coil in order to get 50 Ohm input impedance.

[uniment]

Since he's operating it at resonance, shouldn't the impedance encountered by the power source be completely real, consisting only of the inductor resistances plus the transformed impedance of the load? (The resonant coils are behaving as essentially a transformer) ... and, therefore, the impedance should be real, and require both a capacitor and inductor to change from resistive value to resistive value... Please correct me if I'm wrong

[rfengr]

now try the same experiment, but this time use a 2.4GHz signal ;) ...everything changes!

[paupau101]

Why not connect the source directly to the 30cm large resonant coil?

I think it might improve the performance of the system.

[Homestarbenner]

The source we used had a 50 Ohm internal resistance. When directly connected, it would kill the 'Q' of the transmitter. I believe it might be possible to hook a source up directly if it had a low enough internal impedance.

Thanks for showing interest!

[jaraved44]

Ben Cannon is a god.