New Posts  All Forums:Forum Nav:

Wireless Charging

post #1 of 13
11/16/07 at 7:49pm
Thread Starter 
Just a discussion, do you think they will ever have the possibility of wireless charging.

For example plug some sort of box into the wall and then some wireless connection charges the laptop. Means you can sit without worrying about power getting low or having to sit near a plug.
That would be good!
Reply
Reply
post #2 of 13
11/17/07 at 1:27am
id be scared with that much power radiating about the room, methinks you wouldnt need to go tanning

i would rather have a lightweight and POWERFULL battery...like a 50 cell that weighs a couple of ounces..10hr battery life with 130watts ...id much rather have that
Reply
Reply
post #3 of 13
11/17/07 at 5:56am
That's how they charge Pace Maker batteries...
Reply
Reply
post #4 of 13
11/17/07 at 10:17am
I think with USB 3.0 we will have options to charge wireless and then I think it will filter over to cell phones.
Reply
Reply
post #5 of 13
11/17/07 at 1:40pm
powercast has technology to pick up noise radio waves from a transmitters..however, they only pick up 70% of the transmitted power and the output is in the single digits as far as watts..are small laptop needs about a 65w adapter...so i can see some potential there...but for powerhungry things like dvd watching or gaming..dont think its viable for a while
Reply
Reply
post #6 of 13
11/17/07 at 6:04pm
id rather see the 3 year was it? or 30 year? batteries before wireless power

but its do-able, but like a poster said you may just get more than a tan if you walked inbetween the 2 hubs im sure

so yeah gimme a 3 year battery before that


soulsaver
Reply
Reply
post #7 of 13
11/18/07 at 4:06pm
jwilson02 is correct. The amount of radiated power to charge a mobile device would enormous and dangerous. RF power from the transmitter increases with the square of the distance to the device (because the radiated power always falls with off with the square of the distance from Transmitter to Receiver). This why bluetooth and IEEE 802.11X technologies have maximum distances beyond which they cannot operate; the power levels are set by the FCC to what are considered to be safe levels.

What you will see using a "wireless" charging system will likely be a common concept where you place the mobile device onto a charging pad and a close proximity magnetic field is coupled into a transformer / rectifier in the mobile device charging you laptop etc.

This technology is already in use in limited applications. Meaning it is not a "vaporware" technology.

- Mike
Reply
Reply
post #8 of 13
11/18/07 at 4:32pm
yeah those cellphone "wireless" charging pads are a joke
Reply
Reply
post #9 of 13
11/18/07 at 4:36pm
you are not talking about those little "signal booster pads " that you some times get in a box when you buy something for your cell phone are you?

Those dont do much if anything at all for boosting your signal.
Reply
Reply
post #10 of 13
11/18/07 at 4:40pm
What
i was talking about is used a fair amount in kitchen appliances. The device sets on top of a base and the base plugs into the wall. The base generates a magnetic field from the wall AC and it is coupled into the appliance where it is rectified and used to power the device. There are no wires or plugs to get wet or short out.

I have seen a charging pad demo that uses the same concept for a cell phone and other portable devices. However, I can not say I used them.

- Mike
Reply
Reply
post #11 of 13
11/19/07 at 12:22am
I think wireless power transmission will be around a lot sooner than we think, MIT has been working on it for at least a year now.

LINKS:

http://web.mit.edu/newsoffice/2006/wireless.html
http://arstechnica.com/news.ars/post/20061115-8229.html

so I would think its just a matter of time
Reply
Reply
post #12 of 13
11/19/07 at 2:27am
Quote:
Originally Posted by MDRhoades View Post
What
i was talking about is used a fair amount in kitchen appliances. The device sets on top of a base and the base plugs into the wall. The base generates a magnetic field from the wall AC and it is coupled into the appliance where it is rectified and used to power the device. There are no wires or plugs to get wet or short out.

I have seen a charging pad demo that uses the same concept for a cell phone and other portable devices. However, I can not say I used them.

- Mike
The problem with those (and the pacemaker chargers) is that the available power drops exponentially with the distance. I.E., at 1 inch you have a certain amount, at 2 inches 1/4 the power, 3 inches 1/8, etc...
Reply
Reply
post #13 of 13
11/19/07 at 2:34am
Ah, not quite so much with the MIT scheme--it uses magnetic resonance, which drives efficiency up.
Reply
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Notebook Forums - General