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Author Topic: Tommey Reed's Back EMF Circuit  (Read 1083 times)

TommeyLReed

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Tommey Reed's Back EMF Circuit
« on: January 27, 2023, 01:22:38 AM »
Hi All,

This is my Bach EMF circuit to collect the fly back effect do to load.
https://www.youtube.com/watch?v=O5114W_Nx5o
Tom

floodrod

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Re: Tommey Reed's Back EMF Circuit
« Reply #1 on: January 27, 2023, 01:48:26 AM »
Thanks for posting this..  I have been working on an almost identical circuit..  Sometimes I drive a motor with it, sometimes solid-state.. But I have been flipping polarities with an H-bridge and using a choke,  or primary of a transformer with open secondary..

I sent you a PM.. 

floodrod

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Re: Tommey Reed's Back EMF Circuit
« Reply #2 on: January 27, 2023, 08:32:44 PM »
After building this and looking closely, it is not identical to my build- actually is totally different.

I do not believe this is "Back-EMF" you are collecting.  I am pretty sure you are collecting Fly-back.  Or inductive kick-back from disconnecting and collapsing the magnetic field.  You are only collecting from the negative side, where the flyback escapes.

Back-EMF would be coming out of the hot lead back to the battery, limiting your input amperage. But the diodes are blocking the Back-EMF.

It differs from my build, as I am only separating off the hot side.  And I get no varying voltage spikes.  All my collection pulses are exactly uniform and my voltages stay steady.

I still thank you for posting it.  Looks identical to a typical diode flyback arrestor they use on motors, but with a cap to catch it.  Which could be useful.