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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: CCFL transformer
Date: Sun, 28 Apr 2024 14:19:50 +1000
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On 28/04/2024 3:17 am, legg wrote:
> On Sat, 27 Apr 2024 01:26:09 +1000, Bill Sloman <bill.sloman@ieee.org wrote: 
>> On 27/04/2024 12:24 am, legg wrote:
>>> On Fri, 26 Apr 2024 01:36:06 +1000, Bill Sloman <bill.sloman@ieee.org>wrote:
>>>> On 26/04/2024 12:52 am, legg wrote:
>>>>> On Wed, 24 Apr 2024 01:57:36 +0200, Klaus Vestergaard Kragelund <klauskvik@hotmail.com> wrote:

>>>> There's a least one truly horrible 1969 text book on transformer design
>>>>
>>>> https://www.amazon.com.au/Soft-Ferrites-Applications-C-Snelling/dp/0408027606
>>>>
>>>> and it took me years to realise quite how confusing it was.
>>>
>>> In my day, it was considered to be the bible, but I could never
>>> afford a copy, so depended on photocopies and library access.
>>
>> I worked for EMI Central Research at time I thought that I needed it, so
>> access wasn't a problem. The Seimens soft ferrite application notes
>> turned out to be a great deal more useful, and much better organised.
> 
> I believe it was Janson, Barrow and Burgum, with Jongsma at Philips
> (Mullard), who reorganized Snelling's math into useful off-the-cuff
> expressions in the mid 70s. . . using the Steinmetz coefficients etc.
> 
> E.A.B. 32 through 34 are typical, if my records are accurate.

Never got to see any of that.
> 
> The Seimens catalog notes for use of power ferrite graphs 'sort of'
> did the same, without actually explicitly stating ANY of them.
> They were free and in book form.
> 
> Anyways, high voltage applications are a different book.

Why? The ferrites never get to see the high voltages.

The windings do. When I was a graduate student I got to know a guy - 
Ales Strojnik - who had come from Slovenia to Melbourne to build a 600kV 
scanning transmission microscope,and immersed his winding in liquid 
transformer oil. Sulphur hexafluoride gas was more popular but made for 
a bulkier system.

https://en.wikipedia.org/wiki/Ale%C5%A1_Strojnik

He was rude about the French higher voltage version, which was huge.

-- 
Bill Sloman, Sydney