RE: [CAD_CAM_EDM_DRO] Re: 80V Toroid & Ferrite Beads

Hi Jon -

I was under the impression you could parallel the windings on a
center-tapped transformer as well. What happens if you try? It
seemed to me that whether you brought out two leads or one lead
from the same middle point in a winding, you could just use that
point as one terminal, then join the other two ends for the second
terminal of a paralleled setup. Is the direction of the each
winding critical here?

Regards,

Carlos Guillermo
VERVE Engineering & Design

-----Original Message-----
From: Jon Elson [mailto:elson@...]
Sent: Tuesday, December 09, 2003 9:33 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: 80V Toroid & Ferrite Beads


JanRwl@... wrote:

>In a message dated 12/9/2003 12:14:19 AM Central Standard Time,
>admin@... writes:
>Since it's a center tap transformer you can run the windings in
>parallel.
>How???
>
>
>

If it is only center-tapped, you can't exactly parallel the
windings.
But, you can use the 2-rectifier center-tapped design, like this :


|\ |
__________| \|_____________
( | /| |
( |/ | |
( |
( |
(_____ (-) |_____ (+)
( |
( |
( |\ | |
(__________| \|_____________|
| /|
|/ |

You can just use the two AC terminals and the + terminal of
a bridge rectifier module if you don't want to fool with separate
diode components.

Only if the transformer has a "split" secondary, with 4 wires
brought
out can you actually parallel the two winding halves to get double
the current at half the voltage. The circuit drawn above gives
the
same benefit at DC, however, because each winding half only
conducts
current half the time.

Jon


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