Now that’s clever – a real use of wireless power transmission…

by Stephen Hobley on October 6, 2010

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I’ve been looking into persistance of vision (POV) style displays recently as part of a new project. The spherical projectors are especially cool and groovy.

What really impressed me about this particular implementation is the use of pulsed 12v DC to drive a circular transformer wrapped around the drive motor. So enough power is being transmitted to the spinner to illuminate all the LEDS. The corresponding web site is in Russian, but you can use Google to translate it.

Click Here for the English Translation

The corresponding pickup coil rectifies and smooths the power signal back to a stable level, enough to power all the LEDs in the POV. I’m seriously thinking about applying this principle to my Dalek dome – to give it full 360 degree rotation, no slip rings, or extra batteries.



{ 4 comments… read them below or add one }

Dan October 6, 2010 at 4:44 pm

There’s nothing special about this at all. This pulsed DC You speak of is Alternating Current. Its how transformers have to work. The other coil does not rectify it, it converts the growing and collapsing magnetic field back into alternating current. Then he has —- a RECTIFIER to rectify it, some collection of diodes or just a bridge rectifier. It’s the same way all kinds of things work, like your electric toothbrush charger.

Stephen Hobley October 6, 2010 at 5:32 pm

I’d forgotten about the toothbrush charger.

Next to that, (and the slightly contrived MIT lightbulb), this is the only time I’ve seen an air cored transformer put to a use other than creating a light show.

I came up against this problem recently, and opted for slip rings to transmit power and signals to a rotating body – since I was working in DC the “Tesla coil” approach didn’t occur to me.

Does anyone know if we can use pulse width/timing to transmit information too? Seems feasible…

Audun Andersen October 8, 2010 at 4:35 am

We have developed several application with wireless power. It is possible to send low speed communication in the same coild as the power or you could closely integrate it with high speed communication as we have done in the 3 stab:

Wireless Power and Communication

Steve connell October 19, 2010 at 11:19 am

Hi, Steve, I am blown away by your laser harp, it’s fantastic. I am part of a function band called the spies,, we are based in the north west of England . We are currently updating our light show, with more lasers and some powerful 3watt led wash lights, however having a laser harp on stage would be a dream come true as I am also a big Jarre fan. I realise that these can’t be bought commercially, which brings me to the point do you buid the harps to order and if so, how much would one cost. I hope to hear from you soon.
Kind Regards
Steve Connell

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