Inductive Kickback

[synchro1]

Quotes from Tinman's coil shorting circuit thread:

Comment #87 from Erfinder:

"I completely agree with you, Tinman's builds, are awesome". 

6 comments later, #93 Tinman replies to Erfinder:

"You are a sick man,and i wish to have nothing more to do with you.
Some told me some time back that you are a couple of cows short in the top paddock,and your words speak volumes".

[MileHigh]

Laurent, Gyula:

For the zoom in on the switching event (attached), I am quite sure that this is noise associated with the reed switch opening and breaking the voltage supply to the drive coil.  To describe that in more detail, it means that when the reed switch opens and breaks contact, it actually makes and breaks the contact multiple times during the switching process which in this case appears to take place over the course of 200 microseconds.  It is also called "switch bounce" and with larger automotive-type switches the bouncing can last on the order of a few milliseconds.

The easiest way to stop this would be to go with some sort of a solid state switch configuration that has a conditioned Schmidt trigger input.  I don't think it is necessary for this type of investigation.

MileHigh

[MileHigh]

When we calculate the dissipated power from the below diagram,during the 70% off time,the circuit should be split in half,and the dissipated power from each half should be equal-correct?.
So if we have say 13,68mW being dissipated across the inductor and resistor,we should also have 13.68mW being dissipated across the LED--?--see pic below.

So should it now be 13.68 + 13.68 X 70% for our power out?
Which would be 19.15mW ?

No, there is no reason to assume an even energy split between the two halves.  I just did a big measurement treatise on the "Sharing ideas on how to make a more efficent motor using Flyback" thread, you should study it.

Also, why are you back to using an LED?  Recently the point that it is no good for power measurements was pounded away at over and over.  I suggest that you look up "IV characteristics of a diode" to understand why using an LED is one of the worst things that you can possibly use to make power measurements with.

My suggestion to you is to swap the LED for a resistor and read my measurement treatise and then come up with a logical step-by-step measurement strategy.

[tinman]

No, there is no reason to assume an even energy split between the two halves.  I just did a big measurement treatise on the "Sharing ideas on how to make a more efficent motor using Flyback" thread, you should study it.



My suggestion to you is to swap the LED for a resistor and read my measurement treatise and then come up with a logical step-by-step measurement strategy.

Also, why are you back to using an LED?  Recently the point that it is no good for power measurements was pounded away at over and over.  I suggest that you look up "IV characteristics of a diode" to understand why using an LED is one of the worst things that you can possibly use to make power measurements with.

It is because of the I/V characteristics(which im well familiar with) of an LED,that i am using an LED
Can you work out why?.

[tinman]

Quotes from Tinman's coil shorting circuit thread:

Comment #87 from Erfinder:

"I completely agree with you, Tinman's builds, are awesome". 

6 comments later, #93 Tinman replies to Erfinder:

"You are a sick man,and i wish to have nothing more to do with you.
Some told me some time back that you are a couple of cows short in the top paddock,and your words speak volumes".

Nice try synchro.
Now lets have a look at why i said what i said-->in stead of your fumbled effort to discredit me.

Quote Erfinder-->Brad, can I call you Brad, its better to be pissed off than pissed on, well....guess that's relative huh....if getting pissed on is your thing or not.

My reply to that was-->"You are a sick man,and i wish to have nothing more to do with you.
Some told me some time back that you are a couple of cows short in the top paddock,and your words speak volumes".

You really seem to take being wrong  to heart synchro,even to go as far as chopping up bit's and pieces of post, and pasting them together to try and make those that show you to be incorrect, look bad.

Nice try,but an epic fail,as people here have the ability to read--do you not know this?.