Thane Heins BI-TOROID TRANSFORMER

[teslaalset]

Guys, I am going to have some sleep.
We'll continue discussing tomorrow.....zzzzzzzzZZZZZ

[woopy]

Hi Thane

thanks a lot for all your info

Now a simple question

Is the second  "secondary coil"  really necessary ? I mean do you think (or know)  that the effect would desappear if we keep the outer toroid core with only one secondary ?

Or better said ,is the ping-pong game between the 2 secondaries  BEMF mandatory ?

and apart of this, the red colour seems to suits you very well but with a white cross in the back it could be nicer and i remind you that you  are always invited for a "raclette " here  in Switrzerland

Cheers

Laurent

[teslaalset]

@ teslaalset. saturation core is to obtain a higher relucatnce in the primary core, the air gap do the same thing, but when you saturate a path you draw more current in the primary that's what on conventional transformer we use Boucherot formula to avoid saturation, and very very small air gap add linearity and amplify Heins effect (the magnetic diode) without increasing substantialy the current (you can wind more turn to avoid this). Saturation is not whole the time because we have sinusoidal signal... I have read Thane's document the primary can work with high Z or high R and saturated. The high Z mode is like conventional primary (not saturated) the high R mode is heavely sataurated but the current is limited by the R of the very small wire. So the BTT can have several configuration, I think the gapped version is more stable with heavy load, or varying load like motor...

SchubertReijiMaigo,

I really needed that sleep, I see you point now.

The first part of the B-H slope (the lower H part) is less steep in a gaped core when compared to the same non gaped one.
A less steep slope has higher reluctance in that part of the B-H curve than a steep one.
That allows indeed for much higher currents, so basically you scale the unit up to allow higher higher powers (currents).
But when you only use smaller loads, I think it's not worth using an air gap, because the losses will be higher percent wise.

[penno64]

Hi Teslaalsat,

Thank you for the advice regarding the core.

Can you please advise how the secondaries are connected to load - series or parallel ?

Kindest Regards, Penno

[teslaalset]

Hi Teslaalsat,

Thank you for the advice regarding the core.

Can you please advise how the secondaries are connected to load - series or parallel ?

Kindest Regards, Penno

Hi Penno,

I believe the loads on Thanes BITT are individual loads but equal in ohmic value. So each secondary coil has its own load.

In my view its perfectly OK to connect the two secondary windings in series and use one ohmic load, but they should be connected in the right way to obtain the clockwise and anticlockwise BEMF that eliminate each other.
Also you need exactly the same amount of windings in the secondaries if you connect them up in series.

I wouldn't connect them in parallel. They will never have exactly the same inductance and resistance.
It's important that the currents through those secondaries are exactly the same to get the best efficiency.