Re: Low THD transformer circuit

On Fri, 17 Nov 2006 09:24:09 +0100, martin griffith
<mart_in_medina@xxxxxxxxxxx> wrote:

On Thu, 16 Nov 2006 18:13:51 -0800, in sci.electronics.design John
Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Fri, 17 Nov 2006 00:14:49 +0100, martin griffith
<mart_in_medina@xxxxxxxxxxx> wrote:

On Thu, 16 Nov 2006 13:53:17 -0800, in sci.electronics.design John
Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Thu, 16 Nov 2006 21:23:59 +0100, martin griffith
<mart_in_medina@xxxxxxxxxxx> wrote:

Just found this
http://www.pat2pdf.org/patents/pat4614914.pdf
It's how Audio Percision let very low thd from transformers




martin


Why not load the transformer secondary into a summing point and drive
the primary through a resistor, or from a current source? That would
keep the core at nearly zero flux.

John
I think that works for input transformers, not output transformers



Well, follow it with a floating-supply amp, just like the input case.

This has 16 floating output channels, each with its own dc/dc
converter. I figure that there are about 86 different supply rails on
this board.

http://www.highlandtechnology.com/DSS/V470DS.html

We're using ISDN data transformers as the dc/dc things, about $1.10
each.

John

Ok you win.........:-)


martin


Or use a second tranformer to sample the output of the main one, and
supply feedback. That one could work in zero-flux mode.

John

.

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