RE: Flyback Transformer Boards - Any interest ? ? ? ?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Hi Malcome,

Wow, i did not know that!  Even when i roll my own flybacks, i leave the 
gap spacers in the core.  Hmm, maybe i should test this push-pull setup 
again and see how it goes with a gapless core.

Steve


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: RE: Flyback Transformer Boards - Any interest ? ? ? ?
>Date: Thu, 02 Oct 2003 17:54:32 -0600
>
>Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>
>
>Hi Steve, all,
>
>On 2 Oct 2003, at 6:42, Tesla list wrote:
>
> > Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
> >
> > When i tried push pull to drive a flyback it was absolutley aweful!!!  I
> > must say, dont use push pull!  The mosfets got insanely hot and the flyback
> > didnt make very good sparks.  Im now using a half bridge (with a gate
> > isolation transformer and all!) to drive just about any flyback with more
> > power than you will ever need.  Though, it wont drive ignition coils due to
> > the high frequency gate transformer.
> >
> > Steve
>
>It is IMPORTANT TO NOTE that an unmodified flyback transformer has a
>gapped core. Since most of the roll-your-own "flyback" designs talked
>about on the list are actually self-oscillating push-pull designs
>which rely on core saturation for correct operation, it is important
>that the gap spacers are removed for these designs. Failure to do
>this means that the switching elements are trying to saturate air and
>will go red in the face fighting a battle they can't win.
>
>Malcolm