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Reply-To: "fred bartoli"
From: "fred bartoli"
References: <6hNK9.982$qA3.firstname.lastname@example.org> <email@example.com>
Subject: Re: Core gapping techniques and general SMPS magnetics stuff
Date: Tue, 17 Dec 2002 10:37:51 +0100
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NNTP-Posting-Date: 17 Dec 2002 10:38:11 MET
chris a écrit dans le message :
> Chris Carlen wrote in message
> > Hi:
> > Unfortunatly, the thing is a little larger than I'd like, but I suppose
> > it doesn't matter too much. I'll probably design a general purpose
> > 90-350V adjustable flyback supply with max. output power of about
> > 10-15W, which seems reasonable for that core. Then I can use it for the
> > But it looks like I'll have to gap the core to get it to have enough
> > amp-turns for the inductance I'd like, without saturating when being
> > used as a flyback inductor.
> Hi, flybacks are only suitable for fixed load applications, so you can
> forget about general purpose.
Huh... Only fixed load ??????? Why please ?
As you have discovered there are serious
> magnetic problems to be solved for them as well. The simple solution
> is to change to a forward converter, all you need to do is add a
> demagnatising winding with a diode and swap the output winding
> connection over.The rest is the same and you dont need any gaps.
You also forgot the secondary side inductor. The additional winding, diode
and inductor is a high price paid for such a misbelief.
For 10/15W power flybacks are much more appropriated and well designed
there's nothing as "load problems".
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