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From: "Michael Denner"
Subject: SMPS transformer core power throughput calculation
Date: Fri, 13 Sep 2002 18:02:56 +0100
NNTP-Posting-Date: Fri, 13 Sep 2002 17:05:18 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
I'm difficulty calculating power output from the switching frequency & core
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 can
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?
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