Silly question about voltage and current

[MileHigh]

Farmhand:

When a coil is snubbed by a freewheel diode then by definition the current decay will take much longer as compared to when a coil discharges into a high voltage EMF source or it discharges into a high resistance which causes the coil to generate a high voltage.

Unfortunately you are in the same territory as Dave.  You put up a scope screen grab and you aren't saying what trace is what and what case is what.  You have no related schematic showing where the scope probes are connected to the schematic, signal and ground connections.

So it's back to doing mental gymnastics to try to figure out what you are saying.  All that I can state is that your comments about the discharge time for the coil are wrong and I can perhaps make some inferences about what your traces mean.  But I am not going to spend five, ten, or 15 minutes trying to figure out the pieces to the puzzle.

MileHigh

P.S.:  I can see how you were still editing your posting when I commented and added more information.  It's an improvement but I will remain a stick in the mud and would prefer an accompanying schematic snipped with probe positions and all that jazz so that I can try to understand your points without the mental gymnastics.  This is just an editorial comment, I am not literally asking you to do this.

[Farmhand]

Farmhand:

When a coil is snubbed by a freewheel diode then by definition the current decay will take much longer as compared to when a coil discharges into a high voltage EMF source or it discharges into a high resistance which causes the coil to generate a high voltage.

Unfortunately you are in the same territory as Dave.  You put up a scope screen grab and you aren't saying what trace is what and what case is what.  You have no related schematic showing where the scope probes are connected to the schematic, signal and ground connections.

So it's back to doing mental gymnastics to try to figure out what you are saying.  All that I can state is that your comments about the discharge time for the coil are wrong and I can perhaps make some inferences about what your traces mean.  But I am not going to spend five, ten, or 15 minutes trying to figure out the pieces to the puzzle.

MileHigh

I do have a related schematic and you have seen it before, but you must have forgotten. The top shots show a coil pulsed and the discharge clamped by a freewheeling diode, the bottom shots show a coil pulsed and the discharge directed to a higher voltage load. I can find the schematic or draw another. There should be no need.

I don't see any discharge of current continuing after the snubbed coil is switched off do you ?

There is no puzzle, have Conrad do the experiment for you. It's very simple.

The top shots show a coil pulsed with a diode clamping the discharge to the supply rail, where is the current after switch off.

P.S. you reacted too quickly and didn't give me time to edit the post. re read it now. Slow down champ.
..

[MileHigh]

Farmhand:

You can't expect people to look at a scope screen capture from you and then pull the correct schematic from a "mental memory file of previous Farmhand postings" and then visualize that in their mind while looking at your scope capture.   That doesn't make any sense.  When you make presentations you have to come out of your own personal bubble and pretend that you are an outside observer with no preloaded preconceptions.

Anyway, my points have been made.  When presented with incomplete data like this I normally simply tune out.

MileHigh

[MileHigh]

Farmhand:

I don't know why your tests are giving you contrarian results.  However, the coils doesn't lie.  The higher the resistance the coil discharges into, the higher the output voltage and the faster it discharges.  An ideal coil discharging into a zero ohm resistance will never discharge and have an output voltage of zero, and the current will flow forever.  When a coil discharges across a diode, that's akin to a very low resistance, hence a larger discharge time.

MileHigh

[Farmhand]

Actually I "may" be wrong in where I placed the current sense resistors, so you are probably right, I will need to do that experiment again to get a better result. No problem.

Point taken. Will provide revised shots as soon as I can with a setup made just for the experiment. And the schematic.