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Old 5th January 2012, 11:53 AM   #91
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the most sensible thing you said so far......

No need to be RUDE. We are only trying to help.
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Old 5th January 2012, 11:56 AM   #92
AJT is offline AJT  Philippines
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oh...not meant to sound that way.....it is just that, if you are not building any transformers, then these theories will be very hard to digest.......just trying to help......
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Old 5th January 2012, 12:08 PM   #93
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We are taught these theories at Uni. And, funnily enough they work. The Economists and Cheap manufacturers will always try to cut corners.

Why do you think that mains transformers in Mass Produced goods often fail.

It's down to the money counters trying to make things as cheap as possible.

In the DIY World we are trying to better them.

I recently disassembled a Far Eastern Electric Typewriter that had a failed mains transformer. Reverse engineering the maths the manufacturer was using over 3200mT as the magnetising flux on a cheap transformer. It was designed to NOT last.

Last edited by KatieandDad; 5th January 2012 at 12:11 PM.
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Old 5th January 2012, 12:15 PM   #94
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i build my traffos to run cool to touch.....

i run them at less than 0.9T and in some cases even down to 0.6T.....

diy'ers are not motivated by profit, we build them to our liking based on some needs.....
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Old 5th January 2012, 12:17 PM   #95
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Quote:
Originally Posted by Tony View Post
i build my traffos to run cool to touch.....

i run them at less than 0.9T and in some cases even down to 0.6T.....

diy'ers are not motivated by profit, we build them to our liking based on some needs.....
Exactly, that is why I recommend 780mT.

780mT is what is used in the MoD for long term reliability.

900mT is not too different and is well below the magnetic saturation level of the core.
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Old 5th January 2012, 12:43 PM   #96
iko is offline iko  Canada
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Where W is 110% of the TOTAL secondary power
K = 0.0086 for EI, 0.015 for TU and 0.035 for Ferrite type A13
What would K be for C-core or double C-core?
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Old 5th January 2012, 12:44 PM   #97
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You'd need to ask the manufacturer. I left uni over 30 years ago.
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Old 5th January 2012, 01:13 PM   #98
iko is offline iko  Canada
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As far as power transformer design goes, here's my contribution. This file will be there for the next few days, then I'm going to remove it.

power transformer design
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Old 6th January 2012, 05:37 AM   #99
dtproff is offline dtproff  United States
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Here is a PDF of the MathCAD file I used for AC/AC transformers. In this example it is for a 10W.

Tony
Attached Files
File Type: pdf Mathcad - Linear 50-60Hz Transformer.pdf (70.4 KB, 66 views)
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Old 3rd October 2012, 06:05 AM   #100
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Not in a single post, no. And not when you are shouting.

I would say look up SLUP121-127.pdf (filename) from Texas instrument , a collection of application notes which summarises the design of a ferrite switching transformer quite well.

When you understand the theory, then the formulas are quite easy.

Remember that a ferrite core switching transformer is limited both by saturation and losses.
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