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All,
Looking over some old MEI files I found a particular topology that appeared to have a valid OU signature so after some current analysis, this is what I came up with.
The schematic is seen bellow and basically the device is a reactive-to-real converter with apparent gain. The main difference between this topology and most all of my previous designs is that the load is split symmetrically between L1 and L3. L2 supplies the induction to L1 and L3 through distributed capacitance. I somehow have the feeling that additional primary and secondary coils could be used as well.
The first scope pix shows the input and output of the device. CH3(pnk) is the rms output across one of the 50 ohm load resistors with the weakest output so the pout = 1.416^2/25 = 80.2mw to be conservative. With the pin shown, the apparent COP = 80.2/59.84 = 1.34.
The second scope pix shows the rms of the input current to be 51.62ma which we will use to check the pin using the phase angle between CH1(yel) input voltage and CH4(grn) input current. This is .05162*5.215*cos(77.12) = 60mw which is in very close agreement with the Math channel calculation.
Now the question is, what causes the gain? In looking at the last pix of the spectrum analysis, it is my opinion that the gain comes from the harmonic content in the output loads that is being generated or accumulated in the device itself. Look at the shape of the output in CH3(pnk). It obviously contains many harmonics as is evidenced in the spectrum analysis. Note that all the harmonics are odd (start with the fundamental being 3.545MHz). In testing a similar device with a different coil arrangement, the gain was lower along with lower harmonic levels.
So, if this is true that additional power is coming from the generated harmonics, then the challenge would be to arrive at the optimum parameters that are creating this effect. At this point, I do not know how these harmonics are being created!
Regards,
Pm
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Author
Topic: MEI Revisitation (Read 2131 times)
