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Miniature wireless power demonstrator

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LAN_403

Induced

Mon Aug 02 2010, 06:57AM

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

very cool Marko. I love it.

Here is my super simple low voltage version, based on Dr Stifflers SEC circuit. You'll have to forgive me, Im still new to all of this, I thought others might be interested in an easy low power, cheap to build device.

It uses 12v input @ 40-50ma, and lights up 20 5mm LEDs in series and 4 of the same on the other tower (also in series). Id like to build some more towers to see just how many loads I can place in the vicinity of the transmitting tower. It will also light up small fluro globes wirelessly when tuned correctly. Best distance to date is over 5 feet, though I think it is somewhat assisted by a surrounding metallic structure, as I cant seem to achieve those results anywhere else.

Regards

Marko

Fri Aug 06 2010, 11:55PM

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

Hi guys,

At this time I'm still pondering the perfect way to extract DC power from the receiver. The most obvious is simply a fast bridge rectifier, a filter cap and a buck converter to provide constant output voltage. Still I'm somehow unconvinced this would extract maximum power available from the receiver at given point, because nothing really assures the converter is a perfect impedance match to the source.
The receiver LC circuit behaves like a voltage source with significant series impedance, which I was unsure how to determine - I found it to be much higher than characteristic impedance of the LC circuit, and apparently variable with coupling. I'd be glad if someone would help me there.

Induced:

I've built a similar miniature capacitively-coupled system before - it's dug down deeply somewhere in this forum. It makes a fun experiment and may seem efficient at small scales, but is truly much more useless than magnetic counterpart.

What I'm curious about on your picture - I can't resolve any ground connections on any of your resonators. Are you using a metal sheet under the table? And what is the button-like object behind the larger LED array?

Marko

GhostNull

Sat Aug 07 2010, 08:30AM

Registered Member #2648 Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291

Would this IC help?

,C1,C1003,C1799,P90393

Induced

Sat Aug 07 2010, 10:24PM

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

Marko wrote ...

Hi guys,

At this time I'm still pondering the perfect way to extract DC power from the receiver. The most obvious is simply a fast bridge rectifier, a filter cap and a buck converter to provide constant output voltage. Still I'm somehow unconvinced this would extract maximum power available from the receiver at given point, because nothing really assures the converter is a perfect impedance match to the source.
The receiver LC circuit behaves like a voltage source with significant series impedance, which I was unsure how to determine - I found it to be much higher than characteristic impedance of the LC circuit, and apparently variable with coupling. I'd be glad if someone would help me there.

Induced:

I've built a similar miniature capacitively-coupled system before - it's dug down deeply somewhere in this forum. It makes a fun experiment and may seem efficient at small scales, but is truly much more useless than magnetic counterpart.

What I'm curious about on your picture - I can't resolve any ground connections on any of your resonators. Are you using a metal sheet under the table? And what is the button-like object behind the larger LED array?

Marko

Hi Marko,

There is no metal sheet anywhere. The "transmitting" tower is a simple pulsed DC circuit using a variable inductor and capacitor for the timing. There is a coil which rises up to the elevated capacitance (aluminium cup), the load is usually placed off the collector of the transistor, in series with a 22uH inductor one wire style, with a diode plug.

I placed a small aerial off the 22uH inductor and now duplicate towers can "pick up" this signal wirelessly. The "receiving" towers are basically this:

Capacitive topload/---coil----diode plug>LED>LED>LED>etc with all LEDs in series.

Regards

Marko

Sat Aug 07 2010, 11:50PM

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

Induced wrote ...

Hi Marko,

There is no metal sheet anywhere. The "transmitting" tower is a simple pulsed DC circuit using a variable inductor and capacitor for the timing. There is a coil which rises up to the elevated capacitance (aluminium cup), the load is usually placed off the collector of the transistor, in series with a 22uH inductor one wire style, with a diode plug.

I placed a small aerial off the 22uH inductor and now duplicate towers can "pick up" this signal wirelessly. The "receiving" towers are basically this:

Capacitive topload/---coil----diode plug>LED>LED>LED>etc with all LEDs in series.

Regards

Hi,

you say the led's are all in series, but the last one is connected to ''etc''?

That is what I hoped you would explain.

Also, what is a ''diode plug''?

Marko

Induced

Sun Aug 08 2010, 02:30AM

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

Marko wrote ...

Hi,

you say the led's are all in series, but the last one is connected to ''etc''?

That is what I hoped you would explain.

Also, what is a ''diode plug''?

Marko

Hi Marko,

Sorry, the term diode plug comes from "Avramenko's plug".

It is like the drawing below, disregard the transformer action, and place the elevated capacitance (aluminium cup) on the other end of the "one wire" the end connected to nothing in this picture.

All LEDs are placed in series at the point marked "A"

Regards

PS: The thing under the main light panel is a roll of electrical tape;-)

Marko

Sun Aug 08 2010, 05:45PM

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

Hi Induced,

The way you connected those led's seems very unusual to me - it's basically relying only on their stray capacitance to light them, and I'm surprised it works at all.
I'm certain you would be much better off with another metal topload near the base of the receiver (and led's connected to it) - kind of like a bipolar tesla coil.

Marko

Induced

Sun Aug 08 2010, 10:06PM

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

here is a video from Dr Stiffler that may shed some light on his method. I think it is different to what you think is happening.

Check out some of his other videos. There is some cool stuff.

I will post up a schematic if you want to play around with one.

Regards

Pankaj Patel

Tue Aug 10 2010, 06:46AM

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

Induced wrote ...

here is a video from Dr Stiffler that may shed some light on his method. I think it is different to what you think is happening.

Check out some of his other videos. There is some cool stuff.

I will post up a schematic if you want to play around with one.

Regards

Dear i waiting for the schematic please post it so even i can play with around.

Coronafix

Tue Aug 10 2010, 11:08AM

Registered Member #160 Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938

Found the circuit here:

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