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

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

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