Re: Toroid cores for GDTs

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul Benham" <paulb@xxxxxxxxxxxxxxxxxxxx>

Hi Skip,

I wound some transformers using RG178 coax on a Fair-rite 5978002701 core.

10 turns

k = 0.99948
leakage = 146nH
Primary = 281uH



14 turns

k = 0.99967
leakage = 193nH
Primary = 586uH

Cheers,

Paul.


----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, January 27, 2006 6:09 PM
Subject: Re: Toroid cores for GDTs


> Original poster: Skip Malley <skip@xxxxxxxxxxxxxxx>
>
> I fully agree with a couple of the replies to this thread that the
> leakage inductance of the standard E core Gate Drive Transformers is
> too much.  That is why I don't use them in the switching power
> supplies that I design.  Apparently, some people are not aware of the
> toroid GDTs that are available  You can purchase toroid wound
> GDTs.  A couple companies make these.  They have much lower leakage
> inductance.  I have some leftover from a power supply project.  Click
> on this link http://www.lse.com.tw/upfiles/spec01125457782.pdf to see
> the specs.  These have 1/10 of the leakage inductance of the  normal
> EE core transformers.  What kind of leakage inductance has anyone
> else had when winding your own?
>
> I have some of the ones listed in the listed link above.  If someone
> would be interested in trying one, I would love to let you borrow one.
>
> Happy coiling,
> Skip