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Re: [TCML] Greg's input on inductance
DC Cox skrev:
snip
Unfortunately, you have to monitor the tank
circuit. Prediktor circuit does NOT monitor the tank circuit --- only the
driver circuit.
I see nothing unfortunate in monitoring the primary circuit.
Perhaps this is the root of your misunderstanding: That you think the
circuit run off the gate signals? It's not! It is run off a current
transformer monitoring the Primary Circuit. What else?
We must also consider the drive circuit is a square wave and the tank
circuit is definitely not a square wave. This also leads to problems that
the prediktor circuit does not address. You can not do it with passives.
You will get it close, but as component values shift a change will occur.
Voltage across load in a bridge circuit is a square wave, Current is a
sine wave, assuming LC load.
In an ideal coil it will work. In the real world it will not work as the
component values have shifted slightly after 30-60 seconds of operation.
Now the zero point crossing will be different.
Active components must be used to control it, not passives as in the
prediktor circuit.
DC, would you please take a look at this video, which documents that it
works:
http://www.youtube.com/watch?v=S533gY4R_QI
As soon as the temp changes a small amount the zero cross point will
change.
no.
Solid state triggers require much more precision than normal classic coil
circuits.
Classic coils are not an issue here.
Bad timing leads to tremendous heat buildup in the IGBT
components especially if the zero cross is not actively tracked.
That's why I made this circuit: To accurately track the zero cross. As
opposed to prior art, which is always late by the devices turn off delay
and time.
If you do a nodal analysis and enter all the variables in you will see what
I mean.
I would be interested in seeing the results of your nodal analysis.
Dr. Resonance
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