Power Over Wireless?

[justlukeyou]

Hi Im new here,





Im just wondering if anyone as heard of 'Power Over Wireless' the
transfer of electricity to things such as cell phones without a cable.




Does anyone know what sort of software this requires, for example Apple have taken out a patent to power the Ipod wirelessly, but what software is used to identify the power source?

 

[TrailBarge]

uhmmmm... last I heard, useable broadcast power is still in the realm of science fiction.


Best you could hope for is some sort of induction, which gets lossy as the square of the distance.

 

[justlukeyou]

I think a number of companies are adapting conductive electricity, the sort that recharges electric toothbrushes to recharge things like cell phones and pda's.

 

[phoxeoy]

Man! I hate to be the guy with the metal tooth filling.

 

[AHA-D]

Doesn't sound a good idea to me, except maybe for very very low power. RFID's for instance respond to a signal from outside using the receiving signal to give something back. But that is all close distance. My (army) brother-in-law told me that they once aimed their missile tracking radar "for fun" on a sheep walking along the top of the next hill. Next day the sheep was dead ... Doesn't make me feel like wanting to walk through an energy beam myself.


The opposite - signals over power lines - isn't that much of a success either.


Alex

 

[phoxeoy]

Why do I envision this big earth like microwave cooking everyone inside? Sending power wireless, already here. It's call solar power and if you want to use it, you have to take the money out of oil first.

 

[dburstedt]

Most proposed solutions for terrestrial power transmission applications are pretty low power. Most engineers aren't completely nuts.


http://en.wikipedia.org/wiki/Wireless_energy_transfer

 

[dburstedt]

Forgot to mention that I saw info from Powercast


http://www.powercastco.com/


at CES this year. It was hard to tell exactly how they were proposing to use RF energy to power things, but I assume that they would just trickle in the power in low quantities (kind of like those inductive chargers for waterproof things like toothbrushes).