RE: help needed to build transformer

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

Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com> 

Sorry, I was thinking 60 hertz




Paul S. Marshall





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: RE: help needed to build transformer
>Date: Fri, 02 Jul 2004 12:06:45 -0600
>
>Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com>
>
> >You will need about 1500 turns of 18 AWG on the primary and 15000 turns of
> >22 AWG on the secondary.
>
>at 100kHz?!?!?! surely not.. you'll need a ferrite core to start with, and
>probably about 20 primary turns and 200 secondary, depending on the size of
>the core. You will have serious trouble with parasitic inductance and
>capacitance.
>
>One way round this is interleaving- you might make 5 layers of 40 secondary
>turns, interleaved with 4 layers of 5 primary turns (preferably using copper
>strap instead of round wire) This can cause trouble with insulation, though:
>you will need thick insulation between layers, and maybe vacuum impregnation
>or operation under oil.
>
>You might want to read these articles that deal with output transformers for
>SSTC magnifiers (a similar application to yours)
>
>http://members.aol-dot-com/alansharp03/page6.htm
>http://members.aol-dot-com/alansharp03/xformer.htm
>
>Even with interleaving, the leakage inductance might be too high to operate
>at 450kHz, and it might prove easier to redesign your power supply to
>resonate with the leakage inductance, as in Marco DeNicolai's "Thor" power
>supply.
>
>Steve C.