MIT Wireless Power Transfer Setup - Have some Questions on it

Thread Starter

zero_coke

Joined Apr 22, 2009
294
Did they have an amplifier connected to their transmitting coil? How did they send 60W over with a signal generator? Its impossible, they must've used an amplifier...anyone know of their setup?

Why did they choose 10 MHz? What is the purpose or design criteria for choosing the frequency of operation? They mentioned near field region and whatnot, but if you choose 100 KHz you're very much in the near field (0 to lambda/4) as well, so why 10 MHz? Also, they used distributed capacitance and inductance....why? Why can't you use regular coils and capacitors to achieve the same?

Why did they couple their source to their transmitter instead of directly wiring the source to the transmitting coil? What is the purpose of this? Apparently it increases efficiency and whatnot but any theory behind this is appreciated.
 

Thread Starter

zero_coke

Joined Apr 22, 2009
294
But they still didn't explain why they chose 10 MHz and why they coupled the transmitter to their source instead of directly wiring it.
 

nsaspook

Joined Aug 27, 2009
9,046
But they still didn't explain why they chose 10 MHz and why they coupled the transmitter to their source instead of directly wiring it.
There is nothing magic about 10Mhz, the coil element sizes are easy to work with and the electronics to generate power at that frequency are cheap.

The coupling to the transmitter/receiver coil acts as an impedance match to the high Q resonator. Nothing new here either, we use the same resonator technology to generate high energy RF E fields for Linac beam acceleration.

http://www.google.com/patents/EP1014763A2?cl=en
http://www.google.com/patents?id=rTsIAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false

http://techon.nikkeibp.co.jp/article/HONSHI/20100420/181986/
 
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