Wireless cellphone charger, is this real ?

Discussion in 'General Science & Technology' started by Singularity, Mar 31, 2007.

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  1. Singularity Banned Banned

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  3. draqon Banned Banned

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    yea right. never. this is too much hazard for people, it will destroy cells dna, its like home radiation.
     
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  5. Read-Only Valued Senior Member

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    Yes, it works very well. The principle involved is called induction (transformer action) and is the same thing that's been used in cordless toothbrushes and other similar appliances for a very long time. It's just fairly new to cellphones primarily because it's a little slower than a direct electrical connection through contacts. (Takes a little longer to charge with most of those units.)

    Perfectly safe, too, since it's just a plain 60Hz electromotive field - non-ionizing and extremely weak, anyway.
     
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  7. spidergoat Valued Senior Member

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    Whoa. That's kind of like what Tesla was trying to perfect.
     
  8. Read-Only Valued Senior Member

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    Well, not quite.

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    The principle of induction had been well understood for many, many years. It's employed in every transformer of any type ever built. In fact, it was key in giving Westinghouse his victory of AC electricity over Edison and the DC version he was championing. Passing the power through transformers at each end of the distribution network allowed Westinghouse to transfer it at higher voltage levels and reduced current. That results in tremendous savings of the I-square-R losses. Edison, on the other hand, was doomed to failure because his DC current rapidly lost power from heat generated in the conductors and thus couldn't push his electricity very far at all.

    And it's only effective over VERY small distances (I'm talking about the location of the primary and secondary coils).

    Tesla, however envisioned distributing electrical power over huge distances without the use of wires. And although he did some other work that was both effective and practical, that particular one was a half-baked idea that never would have worked as he intended and visualized it. For one, it was extremely dangerous and for another, it was tremendously inefficient. Sounded good and looked good on paper but neither he nor anyone else could ever pull it off. (And never will.)
     
  9. Singularity Banned Banned

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  10. Read-Only Valued Senior Member

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    Excuse me?????

    What was that little bit of nonsense you linked to supposed to prove?? He never made it work. The Tesla Coil, yes. The "death-ray", never.

    And with an attitude like you've just expressed that's both the first and last time I'll try to help you with an answer to anything.
     
  11. Farsight Valued Senior Member

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    There was something in New Scientist a while back.

    http://environment.newscientist.com...-coupling-could-power-gadgets-wirelessly.html

    A phenomenon called "evanescent coupling" could allow electronic gadgets to start charging themselves as soon as their owner walks into their home or office.

    Researchers have been looking for a way to make a wireless charger for some time. One idea is to use electromagnetic induction – passing an electric current through a coil to create a magnetic field that induces a current in a neighbouring coil.

    This is the way devices like electric toothbrushes are charged, and has been proposed as the basis of a universal recharger pad before (see One charger pad could power up all gadgets).

    The snag as far as mobile devices are concerned is that the charger and device must be in close contact with each other for it to work. Alternative schemes - for instance, transmitting electromagnetic waves in all directions to reach any device in a room - would be hugely wasteful.

    Instead, Marin Soljacic at the Massachusetts Institute of Technology wants to use evanescent coupling, which allows electromagnetic energy "trapped" in a charging device to be tapped by a "drain" mobile device if the two have the same resonant frequency...
     
  12. Singularity Banned Banned

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    Read-Only

    U r good at reading only it seems ,

    There is no need of help from morons like u who shamelessly make statements to thwart innovations.
     
  13. Read-Only Valued Senior Member

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    Who is calling who a moron here? You're looking in a mirror, perhaps?

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    In case you didn't notice it, that link you provided was about what happened in 1934! Doesn't the fact that nothing ever came of the idea after 73 years suggest something to you????
     
  14. Read-Only Valued Senior Member

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    That's interesting, Farsight. Evanescent coupling has been around for a little while and has primarily been used in things like fiber and optical waveguides up until now.

    This might prove to be something very practical.

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    For the record, it should be pointed out that no system is completely lossless, though. It requires power to keep the oscillator running in order to maintain the field and there are also some losses associated with naturally-occuring resonance. But the idea IS light-years ahead of Tesla's crude and ineffective scheme. It may very well pay off!
     
  15. Singularity Banned Banned

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    So just because u cant imagine how to do it nobody should do it, right ?
     
  16. Read-Only Valued Senior Member

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    I never said or implied any of that. What is your problem, anyway? Just trying to be difficult, perhaps? Some approaches simply cannot be made to work

    Another hurdle that Tesla faced and couldn't address was all the wasted power simply radiated away. Equally as bad was the fact that no one could figure out how to charge for the power received. That's because the receiver was nothing more than a huge coil of wire running in a more-or-less circle inside your walls. Anyone could add one and get their electricity without paying anything. It just wasn't a good idea at all and that's why it never went anywhere.
     
  17. Singularity Banned Banned

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    Thank god lightning exists naturally.
     
  18. phlogistician Banned Banned

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    STFU.

    Radio at the power being talked about is non-ionising, so WILL NOT DAMAGE dna or cells. It is not 'like' home radiation, it is exactly that, radio waves are radiation, but undereducated rubes like yourself seem to think that radiation is all dangerous. It's no more dangerous to your health than the 'radiation' from a light bulb (heat and light).

    You really do embarrass yourself at every opportunity, don't you?
     
  19. John99 Banned Banned

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    there is no problem, just your ordinary aspiring mad scientist.
     
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