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Re: [TCML] The Hammertone Predikter



Paul Nicholson skrev:

If only a short lead time is needed, quite a flat
delay is obtain with R-burden=1.2, L-burden=250nH
and 11.2 ohms damping resistance across L-burden.

The lead time changes from 195nS to 214nS from 20kHz
to 300kHz.

Might have to resort to some arithmetic here to find
a rule for setting the RL burden.
--
Paul Nicholson
--
R-burden should match a manageable number of turns on a current transformer, which, at the peak primary current, will produce an output of +-15V or less, as this is the input voltage range of the AD790 comparator. (And at the same time, not produce more than manageable heat due to RMS current heating)
I have nice formula for RMS current in DRSSTC, derived by Steve Conner:
Irms = 0.5*Ipk*sqrt(Ton*BPS)

Lead time is fine for smaller IGBT´s, but not enough for the mighty CM600, which has switching delays in resistive switching, and Rgate 2.1ohm:
Turn-off delay time = 450nS
Fall time = 350nS
Not as bad as I seem to remember.....

Cheeers, Finn Hammer
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