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[ars technica] A magnetic quantum ratchet made of graphene turns AC to DC - Page 2

post #11 of 14
Quote:
Originally Posted by HybridCore View Post

I don't trust wireless 100%. I go wired when I can because as of now, it's better for things like transfer speeds and such. For convenience, I'm debating. For things like wireless gamepads, I hate having to change out or recharge the battery every time.

Yeah, there of course needs to be a lot of advancement in current wireless technologies. I would assume all that would happen well before we had wireless electricity though, heh. So far all that have been managed with RF power has been a few micro-volts I think.

I am just saying it would be nice...for now I go wired when I can too.
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post #12 of 14
Quote:
Originally Posted by Vagrant Storm View Post

Yeah, there of course needs to be a lot of advancement in current wireless technologies. I would assume all that would happen well before we had wireless electricity though, heh. So far all that have been managed with RF power has been a few micro-volts I think.

I am just saying it would be nice...for now I go wired when I can too.

We have wireless electricity right now...
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post #13 of 14
Your PSU likely contains a 120/240V -> 400V DC-DC Boost Converter as the PFC stage which can pass several hundred or a thousand watts with ease and occupies just a few square centimeters on the PCB. I just designed a 10-15V -> 4.2V DC-DC Buck Converter in my spare time.

http://fc07.deviantart.net/fs70/f/2013/013/1/9/led_driver_schem1_by_phaedrus2401-d5rgchn.png


DC-DC is not hard. This is about graphene and its properties, not PSUs.
post #14 of 14
Being an RF engineer I can tell you wireless power is VERY inefficient. I work on power amplifiers and your usually only getting a 20-30% efficiency even using some of the latest semiconductor technologies. Also enough power to power large devices... you think Cell phones might cause cancer at a 500mW max output what do you think might happen when your trying to get to 500 watts to your desk top?
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