|
Well, after many failed tries with various and sundry circuits, I had a thought to use a constant current inductor with one of my previous asymmetrical transmission/delay lines. This Tline is asymmetrical in the fact that there is a copper ground plane positioned under the toroidal wound coil. A pix of the assembly is shown below.
The original idea here was to use a large inductor as the load in the current source ground plane and with a bias or constant current, the effective load would not create any Lenz effect on the Tline. In this example, there is zero bias in the constant current inductor L2 and I was quite surprised at the results.
In the 1st scope pix, CH1(yel) is the signal from the Rigol generator, CH2(blu) is the output voltage, CH4(grn) is the input current, and CHM(red) is the mean input power. In CHM we see the Pin is 21.43mw resulting in an input energy of .02143*2.1282e-6 = 46nJ.
In the 2nd scope pix, CH4 is the current through L2 which is seen to reach a peak value of 14.36ma at time 2.0926us. Although not done in this example, if this current in L2 were clamped at this time, the resultant energy obtained would be .01436^2*.0288/2 = 2.969uJ resulting in an apparent COP = 2.969e-6/46e-9 = 65.1 .
The energy levels here are low but would increase with higher input voltage levels.
Regards, Pm
|