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if load sharing between two transformers is required to be done by putting the two in parallel. Answered

Is it possible to put 2 transformers in parallel having same voltage rating but different current rating?

5 Replies

iceng (author)2014-09-25

It appears the supposition of paralleled equal voltage transformer secondaries can be joined after proper phasing without regard to 4 Amp and 2 Amp power is Correct !!!

To verify this, I have added a low voltage 6V car lamp in an effort to detect any undesirable circulating currents.

Another way to look at this situation ;

1] Assume you have three identical transformers 24V @ 2A

2] Wire the first two in parallel makes sense 24V @ 4A..

3] Now wire the third in parallel with the others.

4] Aha .... you are adding 2A to an existing 4A power

5] Intrinsically we know that we can parallel 3 identical XFMRs

6] Well that is the same with joining two diverse power XFMRs that have the same voltage !!!!

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iceng (author)2014-09-23

If you mean AC transformers, YES you can, ..... making sure they are phased properly

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steveastrouk (author)iceng2014-09-23

Hmm, I would say no, you can get circulating currents that are unconstrained.

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iceng (author)iceng2014-09-23

Before you place a load on the output AC , watch the units for an hour to see if the get too hot to touch.

Certain transformers are made to cost less and skimp on iron and copper,

which causes them to run normally hot to the touch with no load.

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tomatoskins (author)2014-09-23

I've done this with regular bench top power supplies, but if you are just using a generic wall wart why not get one with the current limiting that you need?

I'm thinking that noting overly bad would happen assuming that whatever circuit you are running doesn't overdrive the supply with the smaller current rating. But I'd keep an eye on them to ensure that they aren't over heating.

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