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Thread: power device wirelessly?

  1. #1
    MySQL Error soundman98's Avatar
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    power device wirelessly?

    editafter looking into it a little more, the emi produced by most of the wireless charging ideas would be well higher than what people are supposed to be subjected to.

    later on in the thread, there is a idea that devices can be charged using radio frequencies, but currently, those radio frequencies are not powerful enough to do much more than a small voltage-- which would only be a trickle charge for most devices-- not powerful enough for the 1-3amp load i need to power.

    but, if anyone has any other ideas, i am open to suggestions!!


    so, after seeing those overpriced wireless charging pads, i am coming up with some ideas.

    i am slowly gathering parts for a usb wireless touchscreen to control my carputer, and hate the idea that i would constantly have to charge and check the battery level on it.

    so in comes wireless power-- i remember reading a while ago that the military was working on powering large device remotely, and in a brief search, came up with this link describing different wireless power techniques:
    http://searchmobilecomputing.techtar...eless-charging

    basically, i need 5vdc at about 3A of power to power a wireless hub, the hub will power at least a usb touch screen, and sometimes a usb flash drive. i do not expect this setup to be used(or be useful) any farther than about 15-20 feet from the car.

    so i assume i would also need a rectifier of some sort-- being that all of thses ideas require ac power...

    as per the article, radio charging, or resonance charging would probably work, but i am clueless with how to set them up or the parts needed.

    any ideas?

  2. #2
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    I don't know if this will help you

    http://m.gizmodo.com/site?sid=gizmod...efId%3D5444850

    Sry I am posting from my phone.

    I wonder how they are using wifi to charge. I wonder where you could find any plans to make something like that.

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    Variable Bitrate Wayne613's Avatar
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    Quote Originally Posted by eliofall View Post
    I wonder how they are using wifi to charge.
    Others (companies) have been toying with induction charging for some time now. It's essentially the same technology used to charge the usual re-chargable tooth-brush.
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    MySQL Error soundman98's Avatar
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    Quote Originally Posted by Wayne613 View Post
    Others (companies) have been toying with induction charging for some time now. It's essentially the same technology used to charge the usual re-chargable tooth-brush.
    my first idea, but it isn't as much fun to have to dock it to charge all the time...

    a better link of the article about that wifi charger:
    http://gizmodo.com/5444850/rca-airne...t-wifi-signals

    though if you go down to the comments, the entire thing looks unrealistic--there is just not enough power in wifi waves... though it is a step in the right direction.

    i am remembering as i go-- there was a time when i read a article about a company developing a microchip that would produce a voltage-- that could charge devices-- when a certain rf signal was sent to it-- anyone know if this is being produced now?

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    What can I say? I like serial. Curiosity's Avatar
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    Mod - iPad Forums RipplingHurst's Avatar
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    ^^^That is very cool...and cheap.

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    MySQL Error soundman98's Avatar
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    Quote Originally Posted by Curiosity View Post
    lol, I was thinking it was perfect except for the needing both sides aimed right, but the availability was questionable(listed as 'no suing'?) so I clicked on buy....

  8. #8
    Vendor - Qube colin's Avatar
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    That's pretty badass! I wonder how much power you can actually get out of one of those though? Probably a couple hundred mA?

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    Having played with some of this at CES i can tell you operating range is FAR less then what they advertise. You'll be lucky if you can get usable power at 10inches. Forget about 10ft.

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    MySQL Error soundman98's Avatar
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    edit-- justchat, missed your post, but some extensive searches led me to the same result-- any farther than a inch or 2 and the emi exceeds the levels that are tolerable for people-- so companies couldn't even legally make a device that would work...at least while still using inductive technology..

    after some more searching, i am starting to realize that powering devices wirelessly is a huge undertaking-- even just to get them a couple centimeters away from the transmitter..

    most of the ideas out there rely on induction--and even a basic requirement of 1 amp @5 ft, would be well above the specs for the amount of emi people should ever be exposed to even for a minute...

    same for resonance charging,

    and radio charging would probably be able to charge, but at a much slower rate than than what i would be discharging the battery-- to the point that the equipment to do this would really only add at the very most, maybe 60 sec of run time, for a cost above $100...

    so the plan is modifying--

    instead of complete cordless operation, i might just try up one of those palm pre inductive chargers, though, i need to figure out a battery pack, voltage regulator, charger, and convince my buddy to let me take his Pre apart to check voltage output...

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