Hi Jim,

In the process of trials and errors. Thanks for the thought.

Cheers,

Manu

On Sun, Mar 17, 2019 at 8:36 PM Jim <jim@jpes.com> wrote:
>
>
> Typically, transformers are wound with the primary closest to the core.
> This aids the flux entering the core with the most strength, and
> therefore, providing the most coupling between windings and inproving
> efficiency.
>
> Also, it depends on the use of the transformer as to which way the
> secondaries are wound.  Generally, they are all wound in the same
> direction.  However sometimes they are wound counter to the primary, or
> each other in some cases.  Usually the start of a winding will have a
> dot at thst point on the schematic.
> And if it is wound counter, the voltage out will be 180 degrees out of
> phase with the primary.
>
> Hope this helps.
>
> Regards,
>
> Jim
>
> > -------- Original Message --------
> > Subject: Re: [EE] transformer winding direction
> > From: Manu Abraham <abraham.manu@gmail.com>
> > Date: Sun, March 17, 2019 9:39 am
> > To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> >
> >
> > Replying to my own post,
> >
> > On second thoughts the interleaved layering would cause an imbalance,
> > since not all layers are linked withe same amount of flux, which
> > brings me to:
> >
> > L #1 100T Sec
> > L #2 6T Pri
> > L #3 100T Sec
> > L #4 6T Pri
> >
> > That said, 2 questions again:
> > #1. Should the Primary be in Layer #1, or is it better to start with
> > the Secondary ?
> > #2. Both the Primary and Secondary should be would in the Clockwise
> > direction itself ? (I hope so)
> >
> > Thanks,
> > Manu
> >
> >
> > On Sun, Mar 17, 2019 at 3:45 PM Manu Abraham <abraham.manu@gmail.com> w=
rote:
> > >
> > > Hi,
> > >
> > > Looking at a transformer, primary 12T secondary 200T, step-up
> > >
> > > The primary is split in two, the secondary in 3, to reduce leakage in=
ductance.
> > >
> > > ie,
> > > 1. L1. Secondary  50T
> > > 2. L2. Primary  6T
> > > 3. L3. Secondary  50T
> > > 4. L4. Secondary  50T
> > > 5. L5. Primary  6T
> > > 6. L6. Secondary 50T
> > >
> > >
> > > L1 and L3 (secondary) are at opposite sides of the secondary.
> > >
> > > In which case isn't the direction of the flux changing ?
> > > So, when L1 is wound clockwise, shouldn't L3 be wound in a
> > > counter-clockwise fashion ?
> > >
> > > Am I thinking right, or thoughts in the wrong direction ?
> > >
> > > Apart from the original questions, any thoughts on a better
> > > methodology to reduce leakage inductance ?
> > >
> > > Any thoughts ?
> > >
> > > Thanks,
> > > Manu
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