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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: SMPS transformer core power throughput calculation
Date: Mon, 16 Sep 2002 14:56:35 +0200
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
Organization: Guest of ProXad - France
NNTP-Posting-Date: 16 Sep 2002 14:54:46 MEST
Michael Denner a écrit dans le message :
> I'm difficulty calculating power output from the switching frequency &
> size. All the manufactures data I've come across present a graph of Po Vs
> core volume for all their cores with a switching frequency of 20Khz. Great
> if you want your psu to run at 20kHz!. Also there's generally three curves
> one for each drive topology eg push pull flyback or blocking. In the same
> breath they also state that the power output of the core increases with an
> increase in frequency, which is what I want to calculate!. But no where
> I find a formula which will enable me to calculate what the output will be
> for a given frequency , flux density, and a core area or volume.
> A formula must exist because the Magnetic designer Demo program from
> intusoft has just that very feature. You select your core, input your
> frequency and out pops the maximum power that particular core can handle.
> How is this calculated?. Unfortunately I'm not using the cores in the demo
> data base and I can't afforded the £2600 price tag of the full version
> Does anyone have such an equation/formula?
> Best regards
AFAIR, magnetics designer don't use a single formula to calculate this, but
a lot of basic design equations (including the thermal ones) and an algo
that mimic what you could do by hand.
If you have the doc just have a look at it or download it. I kind of
remember that you'll find all the stuff explained there.
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