 Wireless Power
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BigBad
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Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
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OK my doubtless spectacularly crummy LTSpice IV simulation is up at:
There's nothing clever about this, but I thought I'd post it for discussion purposes.
R1 and R4 represent the load and power source resistances; they should be the same for optimum efficiency.
The circuit is set up with somewhat unrealistic Q on the send and receive sides, but that's easy to fiddle with (alter the Rs). Modelling the distance between the two coils is controlled by the inductor along the top. The inductance goes approximately as 10^n (where n is the number of coil diameters apart the coils are), times the square root of the product of the sender and receiver coil inductances. At the moment it's set to about 2 diameters.
I find that the send/receive efficiency drops off massively at 3 coil diameters, independent of Q; I think that going further can be achieve by tweaking the coupling to the coils from the powersupply and on receiver load; I think you want the highest possible voltages/currents on the coils, so a big step-up and step-down at each side is desirable for longer range. In fact I've a strong suspicion that these systems optimise as non sparking CW Tesla coils :)
Here's the circuit diagram for those without LTSpice IV:
[Edit: Don't double post or post oversized pictures...]
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