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Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
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Posts: 600
I must admit, I was mildly underwhelmed, people have done this before. (for example)
OTOH I suddenly realised, it many cases you can lift the floor boards and have access from above, and what this means is that you don't need to drill a hole through the ceiling, and you can put the lights wherever you want, and even move them around if you don't like them where they are.
Incidentally, the obvious problem with the maglev, where it falls down if the power fails, you can design the field so that it's stable vertically, and unstable laterally (stabilised by electromagnets). So if the power fails it moves sideways and sticks to the ceiling. It ought to be possible, with care, to make it levitate again if the power comes back.
But then I realised that you don't really need the maglev, just use magnets to stick the light to the ceiling, the wireless power is the most useful feature.
Anyway, I thought it was cute and perhaps marginally useful.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
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Posts: 600
I was trying to work out what the circuit is to wirelessly drive a CFL.
First stab involved numerous regulators and inverters.
After more thought it looks like you more or less just need an electronic ballast on the live side and a couple of coils either side of the ceiling maybe a transformer or capacitor or two.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
Pinky's Brain wrote ...
wrote ...
Only problem I see - you go to switch it off
You could make the stable location be against the ceiling (ie. put a big permanent magnet in the ceiling).
You presumably want the bulb to be balanced on a permanent magnet and then stabilised with as small amount of power as possible.
The obvious way to do that is to put the magnet above the bulb.
Trouble is, when the power fails, it will fall down half the time if you do that.
One trick is to have 3 or more attractive magnets each above and to the side of the bulb, in such a way that when the bulb falls downwards, the geometry changes so that the attraction increases.
You can magnetically do that, but it's unstable sideways; so you have a control system to keep it centered; when power fails it moves sideways and then sticks to the ceiling.
Another way would be to have some system that detects the powerfail and yanks the bulb up to the ceiling.
Or... you could do the easy thing and not levitate it and just use magnets to stick it to the ceiling.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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Being a dullard, easily confused by cardboard boxes, where, and how strong are the positioning magnets and what is the mass of the floating lamp deck ?
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
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Posts: 600
Sorry, that levitation vid thing is not my project; I just thought it was cute and on topic I don't have those circuits, you'd have to ask the guy that did it.
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Levitating wireless powered light
