Student Invents Device that Charges Batteries with Radio and WIFI Waves
Posted by Kittyhawk 10 years, 9 months ago to Technology
German university student, Dennis Siegel, invented a device that captures electromagnetic fields like WIFI and radio waves and converts them to stored energy in batteries.
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A local unit (less than the size of a house) would be unlikely to generate more than enough energy to demonstrate the concept. Nothing useful.
Gravitational EM waves would be absurdly high frequency if he's right
Hmmm....
gravity is a very-low-frequency (cycles per light-year)
wave, which we need an Einstein to translate ... and
I bet that there is one in here!!! -- j
folks -- getting energy from the environment. Ben Franklin
started this.
except for inductive reaction (and the power company
catching you at it), you can harvest power from overhead
lines and never pay a cent. you can hear the sizzling
of the capacitive reaction in moist air when you
walk under them. just form a large loop of wire and,
zowie, measure the current -- and convert it!
the video on this site was withdrawn because of 3rd
party reports of patent infringement, it said.
if this works, with a high-frequency diode, the patent
will not do anyone much good -- all able
electronic tinkerers will do it. -- j
Intel has been playing with AC-powered wireless charging for some time (at least since 2008), and Starbucks is deploying wireless charging for its customers beginning this year:
http://www.powermat.com/announcements/na...
https://einstein.stanford.edu/content/re...
http://fas.org/irp/agency/dod/jason/grav...
I'm skeptical about how much power you can get. I'd be shocked to see 1mW developed in a 50-ohm load. That works out to 0.22V, which is VERY hard to work w/ b/c it's less than a diode drop, BUT people are working hard on it b/c many of these energy harvesting ideas produce very low voltages. Even if the boost converter were 20% efficient, you would have 67uA at 3V. That's more than enough to run a small microcontroller with a 32kHz clock running that wakes up and does something at least once a second.
I'd love to here how Mr. Siegel boosts the voltage. That's were all the trickiness is. I love this topic.