Bucking VS Bifilar Coils. A question please.

[NerzhDishual]

Hi witty 'OU' dot com blokes.

I'm referring to: http://jnaudin.free.fr/html/bifvsbuk.htm

It sounds like you could 'gain' something with the Bucking Coils.
The 'OFF' triangles surfaces are are much more important than the 'ON' ones.

Rephrasing Naudin:
- "According to L3" (= seen from L3), a Bifilar Coil (L1 + L2), wired as shown on the picture
behaves like an almost mere resistor during the ON and OFF sequences.

- "According to L3", a Bucking coil (L1 & L2) behaves like an almost mere resistor during the 'ON'
sequence but looks like and inductor during the OFF sequence.

My understanding is:
With Bucking coil it seems like you could recover the energy from a compressed spring
that was crushed almost without energy.
-----------------------------------------
So my question is: what is a Bucking Coil???
How to build a Bucking Coil???

I have wound a lot of coils including bifilar, trifilar, (toroidal or not). But, even after
some research on the Internet I can not figure out surely what Bucking coils could be.

All comments are welcome.
Very Best

[TechStuf]

Bucking coils are rather like stomping rhythmically on turnips to get the last remaining drops of blood out.


Bucking PM fields are where the action is....


But how to make them buck where and when you want them to?


TS

[z.monkey]

I like bucking, bucking is good...

Ask me about my bucking voltage regulators...

So the bucking coil has windings that generate opposing magnetic fields.  The North side of one electromagnet is facing the north side of another electromagnet.  Like you have two windings on one core.  One winding generates flux in the opposite direction of the other winding.  I am not sure if this will work good if both windings are on the same bobbin.  Seems like you need 2 bobbins on a single core.

Yeah, you get springy effects which creates the voltage hysteresis on the scope shot...

OK, Mo Later...

[hartiberlin]

2 Bucking coils are 2 single coils that you put face to face
and which repell magnetically.
So the summation of the field is the same Zero as in true bifilar noninductive coils
but each coil has generated its own normal field.

That is an interesting effect, that the BackEMF effect is not canceled in them
as Naudin found out.

The question is, if the BackEMF burst is energywise
bigger than the input energy used to charge up the
2 bucking coils.

[z.monkey]

Here's an idea...

Add a couple of caps to the circuit to smooth out those high frequency spikes, then tune the signal generator to the resonant frequency of the bucking LC tank circuits and you have a bucking oscillator.

I think I am having too much fun with this...