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Forums
4hv.org :: Forums :: General Science and Electronics
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Transformer question

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Dr. Dark Current
Mon Mar 03 2008, 03:15PM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		If I connect a transformer like in the schematic, what will be the maximum current I can draw from the output, 1A or 10A?

1204557270 152 FT0 Transformer
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Marko
Mon Mar 03 2008, 04:17PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		That's known as 'boost' transformer configuration - you'll safely be able to draw the transformer's secondary rated current, that is, 10A.
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guich
Mon Mar 03 2008, 05:22PM
guich Registered Member #1269 Joined: Sat Jan 26 2008, 06:22PM
Location:
Posts: 9
 		no thats wrong i think: The primary has only a current of 1A so you only can draw 1A
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...
Mon Mar 03 2008, 07:07PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		No, you can draw the full rated secondary current (10a).

The output is in parallel with the primary (1a) winding, so its current rating does not apply.
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Dr. Dark Current
Mon Mar 03 2008, 07:35PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		Thanks
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kell
Mon Mar 03 2008, 08:09PM
kell Registered Member #142 Joined: Sat Feb 11 2006, 01:19PM
Location:
Posts: 102
Marko wrote ...

That's known as 'boost' transformer configuration - you'll safely be able to draw the transformer's secondary rated current, that is, 10A.

The output is lower than the input, so isn't it buck? Boost would be the other way around.
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Sulaiman
Mon Mar 03 2008, 08:21PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
 		I say 11 amps :)

10 amps via the 23V winding and 1A from the 230 V winding.
(Assuming that the phases of the windings are correct)

There are a few ways to look at it but the simplest is conservation of energy
253 V @ 10A in, 230V @ 11A out.
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tesla500
Mon Mar 03 2008, 08:22PM
tesla500 Registered Member #347 Joined: Sat Mar 25 2006, 08:26AM
Location: Vancouver, Canada
Posts: 106
 		Actually you can draw more than 10A from the output. You can draw an output current that causes 10A to be drawn from the input, because the input current goes through the 10A rated secondary.

For this configuration, the maximum output current is the sum of the two winding current ratings, so you can safely draw 11A from the output.


David
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Dr. Dark Current
Mon Mar 03 2008, 08:41PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Sulaiman wrote ...

I say 11 amps :)

10 amps via the 23V winding and 1A from the 230 V winding.
(Assuming that the phases of the windings are correct)

But what assures "sharing" of current between the windings, wire resistance? or am I missing something?
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ramses
Mon Mar 03 2008, 09:00PM
ramses Registered Member #1208 Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
 		i would say 1 amp because at 10 a from the 23v winding( the max) it will draw 1a from 230v. but keep in mind that transformers can usually be overdriven by a significant amount...
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