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Old 4th March 2004, 07:50 PM   #1
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Default Paralleling Transformers

Hi every body

I want to use two identical transformers,each is 36 volt,5 Amp .

I will use bridge rectifier for each one,and smoothing caps for each one of equal capacitance,say 10000 uF .

The question,,,,,Can I parallel their outputs to achieve 36 Volt,10 Amp.

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Old 4th March 2004, 07:58 PM   #2
Duo is offline Duo  Canada
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I believe this can be done safely, however, unless the transformers are completely identical, don't do it.

One thing to make absolutely sure of is phase relationship.
This means that the primary and secondary wires of each transformer must be connected with the right polarity. Essentially, the input wires will have to match in color, and the output wires as well. If the input wires are black and you can't tell which is which, a way to tell is to hook both transformers up to ac power with their secondaries disconnected. Connect one wire from each secondary to eachother, (if the secondaries have brown and orange wires, then connect two browns together.) Leave the orange wires out and test between them with a meter. If you see little or no voltage, that means that the two transformer primaries are in phase and you can connect the orange wires together too. If there is voltage across the orange wires, then you must reverse the wires to ONE of the transformer's primaries.

If the secondary wires are also the same color, you can do the same test and connect both secondary wires if there is no voltage between the transformers, if there is, then reverse either a secondary set of wires or a primary set of wires to get the polarity right.

If you have trouble understanding all this, perhaps someone could shed some light on it in a better way. If not, I'll draw you a diagram in order to make it easier to understand.

I hope that helps...
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Old 4th March 2004, 08:05 PM   #3
sreten is offline sreten  United Kingdom
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With seperate bridges its absolutely safe.

There is no need or point as such to have seperate capacitors.
You will have paralleled capacitors so use a common earth point
and wire them as such.

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Old 4th March 2004, 11:09 PM   #4
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Default similar question but...

Can I safely use two separate 24v DC transformers in following combination:
Each transformer has only single output. Each transformer gets it's own bridge rectifier. From one bridge I take + and from the other one -.
The 2 remaining bridge connections make ground. Then I put capacitors. Will I also get higher voltage (~ 1.4 DC)? Does it work at all ?

Thanks
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Old 4th March 2004, 11:15 PM   #5
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yes
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Old 5th March 2004, 10:07 AM   #6
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gainclone in scsi housing with 4 x 24v toroids with 4 bridges
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Old 5th March 2004, 10:08 AM   #7
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another view
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Old 5th March 2004, 10:09 AM   #8
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Old 7th March 2004, 10:48 AM   #9
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Default Thank you guys for all the replies

These are really nice replies,and pictures also.

The best thing is that I can parallel transformers after using separate bridges,and that is what I wanted.

Kind Wishes
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