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Subject: Re: [geda-user] on-topic Question wrt driving HV piezo transducer
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From: "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Date: Sat, 17 Feb 2018 15:47:33 +0100
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Hello John,

Op 15-02-18 om 22:27 schreef John Griessen (john AT ecosensory DOT com) [via 
geda-user AT delorie DOT com]:
> ...
> No, that's not really off topic since I have a project with circuitry 
> like you want, and with plans to do
> well calibrated feedback controlled HV from python programs...
>
> It's made using gschem, pcb-rnd (evolved from pcb), and volt doubler 
> partsimulated with gnucap.

[snip links]

Browsed around for a bit, interesting project!


I'm looking into transformer design specifics right now, and of course a 
lot of questions come up, e.g. what core material to use, and what to do 
about an air gap. If I have 4 turns primary(*), and thus 400 turns 
secondary, a rather low Al of even 250 will result in a secondary L 
value of 250x400^2= 40 mH. I wonder if this is a problem or not (no, I'm 
really not good with transformers at all).

But if I understand correctly, I can effectively halve the turns ratio 
with a center-tap design, which should improve things quite a bit.

I also found this calculator: 
http://www.dicks-website.eu/coilcalculator/index.html
When I enter some parameters from commercially available cores, it comes 
up with some pretty realistic figures, supporting the notion that I 
should try and keep the turns ratio at 1:50 max. to keep primary 
currents and overall transformer losses within reasonable limits.

Anyway, I'll order some cores and see what they do.

Best regards & thanks for all your input,

Richard