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Miniature wireless power demonstrator

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LAN_403

Induced

Tue Aug 10 2010, 09:56PM

Registered Member #3011 Joined: Sun Jul 18 2010, 11:33PM
Location:
Posts: 9

Hi Coronafix

Yes that is the guide I followed for the construction of the towers. I tried to stick to the details as closely as possible, though in order to get the results I hoped for I had to make some changes,

Im using an older circuit of Dr Stifflers, the one seen on that guide should provide more delicate tuning and better results. The SEC 15-3 circuit is simpler but still effective.

You can see the Dr's site here. He has boards available for testing.

Regards

Pankaj Patel

Wed Aug 11 2010, 04:35AM

Registered Member #2581 Joined: Tue Dec 29 2009, 09:08AM
Location:
Posts: 18

HI Marco,

Its good to here that you mad some small design of wireless power transfer, i have read the post and found that you have some problem with the receiver end i am sharing on schematic of wireless power transfer receiver which is used for battery charging and providing the supply for Texas micro controller evaluation board. if you still feel that this not sufficient then i will provide more help to you.

1281501332 2581 FT74096 Receiver Schematic

[Moderator edit: junk science link removed. Please do not link to sites claiming over-unity and similar technologies.]

rosaldorosa

Sun Aug 15 2010, 10:12AM

Registered Member #3119 Joined: Sun Aug 15 2010, 09:10AM
Location:
Posts: 1

Induced presented idea with 100% efficiency.
12V x 50mA = 600mW
24diodes x20mA x 1.5V = 720mW !!!!!
It's great. it looks the missing 120mW comes from the UNIVERSE
Now seriously!
I've made the test with two pcb coils according to description here. they are spaced 2mm apart.
I supplied source coil with sine generator 1.82MHz .
With 50ohns load the generator provides 952mVp-p
with the same load but on the receiver side the voltage was 100mVp-p
On the receiver side 2nF 500V cap with 50ohms resistor in parallel. acc to formula Z = sqrt(L/C)

Efficiency around 10%

I forgot to mention, that generator frequency was a resonance frequency with quite good Q(I haven't measured).
interesting thing was, that current through the resistor in series with parallel resonance sircuit shunted to ground gived 175mVp-p which gives 18% efficiency.
And that the life!!!!
Looks not everybody wants to hear about that.
Event petrol engine is better then tesla coil

Chris Russell

Sun Aug 15 2010, 09:54PM

... not Russel!
Registered Member #1 Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052

Pankaj Patel wrote ...

Thanks for sharing the idea with us, but this is not the pure concept of wireless power transfer, even better concept is their which is the scalar wave wireless power transfer where even we are not need for the single wire. I am sharing the video and site with you just check out.

Scalar wave power transfer is pure pseudoscience, and not an acceptable topic of discussion on this forum. Please refrain from discussing such topics here, or posting links to sites that deal with such topics.

I've had to fix a bunch of double posts, and several of the posts on this thread are of extremely poor quality. Marko is doing some great work here, so please take the time to compose thoughtful, understandable posts. He has done his best to be clear and concise for you, so please do not ruin his project thread by not paying him the same courtesy. Any future posts that are double posts, of poor quality, or reference pseudoscience will be removed. Hint: if you cannot be bothered to write out the words "you" and "your," this forum is probably not for you.

For Marko and others that have been positively contributing to this thread: excellent work. I'm very interested to see where this all leads.

gaurav

Mon Sept 06 2010, 04:38PM

Registered Member #3171 Joined: Mon Sept 06 2010, 04:26PM
Location:
Posts: 2

I have read few papers on wireless power transmission using magnetic resonators. In transmitting and receiving systems they used one loop and then a coil separately. Could you tell me why it is done?

Marko

Mon Sept 06 2010, 11:27PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Hi gaurav,

the reason to use an external 'feeding loop' is impedance matching to the coils. In other words, it would be impractical to feed the required amount of power into the transmitting coil using a topology like my circuit does, especially if the coil has many turns and no apacitors at all - in that case it will have really high impedance, like a tesla coil, and the feeding loop serves exactly the same purpose as a tesla coil primary.

There are also other ways to acheive the same, such as LCLR or series feed topologies, which are tipycally used in induction heaters.

Marko

gaurav

Tue Sept 07 2010, 06:41AM

Registered Member #3171 Joined: Mon Sept 06 2010, 04:26PM
Location:
Posts: 2

thanx marko ......i got it...

Conundrum

Tue Sept 07 2010, 06:02PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

fascinating stuff..

a relevant note, ferrite magnets have been successfully used to increase Q and reduce tendency to saturate on, of all things, camcorder viewfinders.
it appears that the energy that normally goes into heating the ferrite core is somehow "shunted" into the field, and increases the "swing" resulting in substantially larger scan height but at a cost of higher current draw.

as they say, "You can't get owt for nowt"...

the same scheme can be used with the Joule Thief if you wind the bifilar coils around a surplus optical deck magnet (nice and flat, and easily locateable)

-A

"Bother" said Pooh, as his Gagh became Odo...

Marko

Tue Sept 07 2010, 08:20PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Conundrum wrote ...

fascinating stuff..

a relevant note, ferrite magnets have been successfully used to increase Q and reduce tendency to saturate on, of all things, camcorder viewfinders.
it appears that the energy that normally goes into heating the ferrite core is somehow "shunted" into the field, and increases the "swing" resulting in substantially larger scan height but at a cost of higher current draw.

as they say, "You can't get owt for nowt"...

the same scheme can be used with the Joule Thief if you wind the bifilar coils around a surplus optical deck magnet (nice and flat, and easily locateable)

-A

"Bother" said Pooh, as his Gagh became Odo...

Hi conundrum,

I'm sorry, but I really don't understand what are you up with. Can you explain it better?

Marko

Conundrum

Tue Sept 07 2010, 08:24PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

its a way to get the effect of a larger inductor with fewer windings...

EDIT:- it also has an effect on scan linearity allowing a simpler drive circuit to be used.
maybe someone can try installing one in a modified gate driver transformer to see if it improves the waveforms..

hope this helps, -A

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