Paul Nicholson skrev:
I tried to answer my own question with some spice modelling. With guesses of the inductance of the 50 turn CT winding, here is the lead time in uS over a range of frequencies, using a L-burden of 1uH and R-burden of 0.5 ohms:- http://abelian.org/tmp/fh.090626a.gif Four CT inductances are modelled.
I am using a core with 5.4uH/turn^2 So: 50*50*5.4= 13.5mH
As the CT inductance goes above about ten times L-burden, the curve is independent of CT inductance. For a coil operating in the region of 30kHz, the lead time varies by +/1uS as the operating frequency is pulled from 25 to 35kHz. It might be the case that a more refined burden network could synthesise a more uniform delay over a wider frequency range. I think that Finn's report should make some attempt to analyse the lead time as a function of CT and RL-burden, so that suitable components can be selected for any operating frequency. The lead-network is the crux of the circuit, but does notget much description or analysis.
I agree .
Perhaps Paul Nicholson would like to be co-writer on the next version. Or supply me with leads to follow in that direction. I'm really more of a hardware man, as you all know. :-)Perhaps Finn can develop this into a wider-band constant-lead network.
-- Paul Nicholson
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