MH's ideal coil and voltage question

[tinman]

Since most of the technical discussion has already occurred, and other sims posted, here is my voltage and current trace in its complete form. R=1m Ohm.

Hopefully Brad will continue on the quest to discover the facts about this circuit, and perhaps use my proposed timing with his welding coil to prove it out on the bench. I would suggest that proving the entire wave form is not even necessary, as the main point hindering the understanding I believe has to do with the transition from a positive current to a negative source voltage. I am sure Brad could set up this single voltage transition on his bench without the need for an elaborate wave form.

Hopefully Brad will continue on the quest to discover the facts about this circuit,

Here are the facts about this circuit.

fact 1-i do not have an ideal coil
fact 2-i do not have an ideal voltage source.

fact 3-I tried a test using my 1H inductor,where i placed 12 vDC across it for 300ms,and then reversed the polarity of that 12 volts across the coil with no off time in between. This was done by way of 2x 100 amp solid state relays,and they were triggered by way of my FG.
There was no sign of any high current spike shown on the scope,and the current trace(over the .2ohm 60 watt CVR) shows a smooth transition as seen on the presented scope shots on this thread.



Brad

[poynt99]

Were you able to draw any conclusions from your test results?

[tinman]

Were you able to draw any conclusions from your test results?

Was that not clear in my previous post?

As i stated--no high current spike was observed as i thought may have been seen-only a very thin(as in time frame) high voltage spike could be seen across the coil,but i expect that to be due to the switching period between relays,where there is a very slight off time for both of them during the polarity changeover.


Brad

[MileHigh]

What you failed to achieve Brad was this:

1.  Brad gets up the learning curve and understands the original question and then answers it correctly all by himself and clearly demonstrates that he understands what he is doing.
2.  Brad admits that he was wrong when he stated that my response to the harder question was wrong.

So one more time, you are hightailing it away now that you see that "your way" was completely wrong.

[tinman]

What you failed to achieve Brad was this:

1.  Brad gets up the learning curve and understands the original question and then answers it correctly all by himself and clearly demonstrates that he understands what he is doing.
2.  Brad admits that he was wrong when he stated that my response to the harder question was wrong.

So one more time, you are hightailing it away now that you see that "your way" was completely wrong.

You are no saint pal,and that much has been proven many times now.


1--MH learns what resonance means
2--MH learns how ICEs function
3--MH learns what a J/FET is.
4--MH learns that he is not perfect.
5--MH understands what good could be had by using a VR on a JT

So how about you take a long walk off a short plank MH,and on your way down,take a good hard look at how !good! you really are.
When you come back with results of a test using an !ideal! voltage source,and an !ideal! inductor,just remember that your answer is just that--a theory-a best guess based around !non ideal! equipment and components.

I had no problem at all answering your question,using non ideal generic equations.
But you will have all sorts of trouble putting together the actual circuit in your question,and backing up your !generic! answer--thats a fact.

1-Brad will bow to no mans Theories.
2-Brad will most certainly not be taking MHs word for anything.


Brad