@ION I have no problem with your calculations, they look correct. The problem I see is that "Q" gets squashed pretty rapidly when you try to extract power from a resonant receiver loop. Yes it does, that's why even with impedance matching we can't load it down too much, that's just the way it works. (see charts below for an arbitrary set of parameters I chose) You have stated that it is possible to overcome this with impedance matching. I have not found this to be the case. Could you expand on this with a simple schematic? With impedance matching we can improve the power we can extract for a given Q value. I have tried various impedance transformations, primarily inductive (one pickup loop next to the resonator), and capacitive voltage division. I've done lot's and lot's of calculations and simulations I don't have time to dig up. If this is so, you have created a device which can feed itself without destroying "Q", so you have no need for a transmitter loop, a portion of the output can be fed back to the input to keep the resonant loop oscillating. That's not the implication at all. I don't want anybody to get confused here. This is not free energy or perpetual motion at all. It is just a high quality resonator that couples to the source of energy well (due to it's high Q) and power can than flow wirelessly in more abundance to my receiver. The power is accounted for, no extra power shows up. Comments on the Charts Below: The loops I use for this example, have some inductance and series resitance, so for this case I chose L=1e-4 H, Rs=0.1 ohms, than I calculated C for resonance at 6 khz. Than I applied a load resistance across the capacitor to show what happens to the Q and the detuning that occurs. The detuning chart plots the difference between wL and imag(Z), where Z is the termination impedance of the loop, i.e. the Capacitor and load Resistor in parallel. Notice that optimum power transfer occurs with a load between 100 and 200 ohms, for this example only. The power calculation assumes a 1 volt untuned induced voltage, so I square the Q and divide by the load resitance. By the way, those Q values go up into the hundreds if I up the frequency to 100 kHz. So like I was saying before, the higher the frequency the easier it is to implement wireless power transfer via magnetic field coupling, but if there is no high frequency to harvest, than tough luck. But there is low frequency magnetic and electric polution from the power lines, which explains why so few people have been able to tap into it, because it's low frequency and it's very hard to do! Steven Mark succeeded however, and I admire that achivement very much! EM
« Last Edit: 2011-09-09, 18:49:19 by EMdevices »
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Topic: The TPU: Was It Real ? (Read 287206 times)
