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
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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: caudletwrote:
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Raymond Heckert"
> > Tim, You should expect double the amperage at half thetwo
> > voltage, if you can split the center tap secondary into
> > isolated windings and use a FWB. Just connect the startto
> > start & finish to finish on the secondary. Even if thisis
> > bi-filar wound (not real likely), the voltage is lowand using
> > enough, not to worry about breaking down the wire
> > insulation.
> >
> > RayHex
> >
> How would that be different than grounding the center tap
> two diodes? Using the centertap approach, each side ofthe winding
> supplies half of the power. "Watts is watts".Transformers are
> designed to transmit power. The total amount of power isdetermined
> by the amount of power (I*E) coupled from the primary tothe
> secondary through the magnetic field less any losses inthe core and
> windings. With a given size and type of magnetic coreand a given
> number of turns in the primary of a fixed wire size, youcan only get
> a defined number of watts from the secondary. The ratiosof voltage
> to current change, but to maintain the same load on thetransformer,
> the total wattage has to remain the same.of the sine
>
> In a common center tap configuration the positive section
> wave is transformed by one half of the winding andrectified by one
> of the diodes. During the negative transition of the wavethe other
> half of the winding does positive in relation to thecenter tap and
> performs the other half of the rectification process.You end up
> with each side supplying 50% of the average current athalf of the
> full winding voltage. This maintains the basic totalwattage
> concept. Since heating and losses in a conductor are afactor of
> resistance AND duty cycle, each conductor carrying 2X thecurrent for
> 1/2 the time is equal to two parallel windings carrying1X the
> current for 100% of the time. There are some other minorfactors
> that do not make the two methods EXACTLY equal but theyare on the
> order of 1% or less. Power transformers are not precisiondevices
> anyway. To get the lower voltage,technically you coulduse just the
> center tap and one leg into a full wave bridge and keepPRIMARY
> wattage the same, but your secondary winding losses wouldgo up and
> depending on the wire size of the secondary might startto overheat.
> (Remember that the losses are I^2 * R) Average losses(heat)are
> factored over time.http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
>
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>
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many of the same members are there, for OT subjects, that
are not allowed on the CCED list.
>BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT
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OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
http://www.metalworking.com/news_servers.html
http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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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