CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer

Posted by Jim Brown
on 2002-10-24 22:58:01 UTC
"if you can split the center tap secondary into two isolated windings..."
Would you care to elaborate how one would go about doing so?
Just incase I get the urge to electrocute myself trying to one day!

Regards,
Jim

Raymond Heckert <jnr@...> wrote:Both coils are supplying power during each half cycle,
using a FWB. The CTB only pulls power from one side of it's
coil at a time. I did specify that one had to be able to
'split' the c.t. into 2 separate windings, and 'parallel'
them. Also, the voltage is then 1/2 of the full c.t.
voltage arrangement, but you should be able to draw twice
the current. The secondary winding will supply whatever you
draw on it for power, up to it's rated capacity (actually,
beyond it, depending on how it's designed). If you have a
resulting 36Vdc supply, and a 36 ohm resistive load, you
will draw 1 amp dc, a total of 36 Watts, even if the supply
is capable of delivering 108 Watts (36Vdc at 3 Amps).
Actually, if the supply *is* rated for 108 Watts, the
36V/36Ohm combination will likely draw slightly more than 1
amp, due to 'regulation' of the secondary output, which
will likely be slightly higher than 36 Vdc.

This is may be treading on O.T., perhaps we should retire
to the 'lounge'.

RayHex

----------
> From: caudlet
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Raymond Heckert"
wrote:
> > Tim, You should expect double the amperage at half the
> > voltage, if you can split the center tap secondary into
two
> > isolated windings and use a FWB. Just connect the start
to
> > start & finish to finish on the secondary. Even if this
is
> > bi-filar wound (not real likely), the voltage is low
> > enough, not to worry about breaking down the wire
> > insulation.
> >
> > RayHex
> >
> How would that be different than grounding the center tap
and using
> two diodes? Using the centertap approach, each side of
the winding
> supplies half of the power. "Watts is watts".
Transformers are
> designed to transmit power. The total amount of power is
determined
> by the amount of power (I*E) coupled from the primary to
the
> secondary through the magnetic field less any losses in
the core and
> windings. With a given size and type of magnetic core
and a given
> number of turns in the primary of a fixed wire size, you
can only get
> a defined number of watts from the secondary. The ratios
of voltage
> to current change, but to maintain the same load on the
transformer,
> the total wattage has to remain the same.
>
> In a common center tap configuration the positive section
of the sine
> wave is transformed by one half of the winding and
rectified by one
> of the diodes. During the negative transition of the wave
the other
> half of the winding does positive in relation to the
center tap and
> performs the other half of the rectification process.
You end up
> with each side supplying 50% of the average current at
half of the
> full winding voltage. This maintains the basic total
wattage
> concept. Since heating and losses in a conductor are a
factor of
> resistance AND duty cycle, each conductor carrying 2X the
current for
> 1/2 the time is equal to two parallel windings carrying
1X the
> current for 100% of the time. There are some other minor
factors
> that do not make the two methods EXACTLY equal but they
are on the
> order of 1% or less. Power transformers are not precision
devices
> anyway. To get the lower voltage,technically you could
use just the
> center tap and one leg into a full wave bridge and keep
PRIMARY
> wattage the same, but your secondary winding losses would
go up and
> depending on the wire size of the secondary might start
to overheat.
> (Remember that the losses are I^2 * R) Average losses
(heat)are
> factored over time.
>
>
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Discussion Thread

Chris and Dee 2002-10-21 14:07:19 UTC Speaking of encoders.... C.S. Mo 2002-10-21 14:37:14 UTC Re: [CAD_CAM_EDM_DRO] Speaking of encoders.... Chris and Dee 2002-10-21 17:51:13 UTC Re: Speaking of encoders.... Tim Goldstein 2002-10-22 23:56:32 UTC Center tapped transformer Matt Shaver 2002-10-23 00:10:23 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer Tim Goldstein 2002-10-23 00:18:09 UTC RE: [CAD_CAM_EDM_DRO] Center tapped transformer echnidna 2002-10-23 03:22:29 UTC Re: Center tapped transformer Alan Matheson 2002-10-23 03:28:26 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer caudlet 2002-10-23 05:38:22 UTC Re: Center tapped transformer Keith Bowers 2002-10-23 07:57:11 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer mariss92705 2002-10-23 09:23:33 UTC Re: Center tapped transformer Jon Elson 2002-10-23 10:39:14 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer Jon Elson 2002-10-23 10:43:22 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer Alan Marconett KM6VV 2002-10-23 11:14:33 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer JanRwl@A... 2002-10-23 13:48:53 UTC Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer JanRwl@A... 2002-10-23 14:09:23 UTC Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer Raymond Heckert 2002-10-23 18:26:00 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer caudlet 2002-10-24 05:14:35 UTC Re: Center tapped transformer bjammin@i... 2002-10-24 05:47:54 UTC Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer caudlet 2002-10-24 08:19:57 UTC Re: Center tapped transformer Dave Dillabough 2002-10-24 12:11:43 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer Dave Dillabough 2002-10-24 12:11:44 UTC RE: [CAD_CAM_EDM_DRO] Center tapped transformer Raymond Heckert 2002-10-24 20:51:55 UTC Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer Jim Brown 2002-10-24 22:58:01 UTC Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer echnidna 2002-10-24 23:45:11 UTC Re: Center tapped transformer echnidna 2002-10-25 00:21:02 UTC RE: Re: Center tapped transformer JanRwl@A... 2002-10-25 09:22:41 UTC Re: [CAD_CAM_EDM_DRO] Re: Center tapped transformer Matt Shaver 2002-10-26 00:42:25 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer Dan Mauch 2002-10-26 06:18:48 UTC RE: [CAD_CAM_EDM_DRO]Single point cnc threading tommoser3246 2002-10-26 06:48:43 UTC Re: Center tapped transformer Matt Shaver 2002-10-26 14:45:22 UTC Re: [CAD_CAM_EDM_DRO]Single point cnc threading Jon Elson 2002-10-26 18:25:29 UTC Re: [CAD_CAM_EDM_DRO] Center tapped transformer Dave Kowalczyk 2002-10-26 18:33:55 UTC NAMES get together Jon Elson 2002-10-26 18:38:54 UTC Re: [CAD_CAM_EDM_DRO]Single point cnc threading jmkasunich 2002-10-30 12:09:34 UTC Re: NAMES get together Ray Henry 2002-10-30 20:31:24 UTC Re: Re: NAMES get together Cardinal.Eng 2002-10-31 03:47:16 UTC Re: NAMES get together wbhinkle@a... 2002-10-31 09:03:28 UTC Re: [CAD_CAM_EDM_DRO] Re: NAMES get together jmkasunich 2002-10-31 14:23:47 UTC Re: NAMES get together Ray Henry 2002-11-01 04:36:59 UTC Re: Re: NAMES get together jmkasunich 2002-11-01 06:04:36 UTC Re: NAMES get together