Re: [TCML] Gate drive transformer help

[Michael Twieg <mdt24@xxxxxxxx>]

If you're seeing "distortion" only at lower frequencies then that probably
means you don't have enough magnetizing inductance.  Your driver may be
drooping due to excessive magnetizing current, or the core is saturating.
Though without a better description of the "distortion" it's hard to say.
Just try adding a few more turns and see if it helps.

-Mike

On Sun, Oct 30, 2011 at 6:26 PM, Scott Bogard <sdbogard@xxxxxxxxx> wrote:

> Greetings all.
>     Built my gate drive transformer for my flyback driver, oddly enough
> when scoping it it works great at higher frequencies (30+kHz) but distorts
> below that, except at low duty cycles.  So my questions is do I need a
> different core material, possibly a larger core, fewer turns?  I have one
> larger core, and also several smaller ones, the larger core is already
> wound but seems to only work at much higher frequencies in that
> configuration.  Also tried doubling and halving the dc blocking cap, didn't
> change much...  Any advice would be greatly welcomed.  Also the waveforms
> are a bit distorted even when they are stable, up until very high
> frequencies (100kHz ish) I still think I could use them this way but seems
> to me changing parameters should fix that as well, at least my my intended
> operating range of 10-100 kHz...  Thanks.
>
> Scott Bogard.
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