Electronics > Beginners
Transformer question
(1/6) > >>
PinheadBE:
Hi,

I just bought a transformer whose datasheet ( https://www.mouser.be/datasheet/2/410/media-1067921.pdf ) states that:
"Primary and secondary windings are designed to be connected in series or parallel. Winding are not
intended to be used independently"

Does that mean that I may not use it to build a +12V/-12V where the currents in each winding would not be perfectly balanced ?
Why is that ?

Thanks
soldar:
I think that refers to the connection jumpers and I cannot see how it would matter that the windings have equal currents.
Benta:
Very unfortunate phrasing. I think it means you can't use the transformer with two independent 115 V inputs.
Probably added by a lawyer.
It's a perfectly normal transformer.
djacobow:
I think they are trying to say that their 4kV isolation guarantee does not exist between the two secondaries, or between the two primaries. So, on the secondary, +12/-12 would be fine; they have the same common, but maybe not ok to generate two totally separate outputs expected to be completely independent.

However, I'd be interested to know how they managed to achieve this limitation!
rcbuck:
I believe they are trying to say you must use both primary windings. In other words, if you want to use the transformer with a 115 volt input, you cannot use just 1 and 2 or 5 and 6. You probably actually could do that but the output current would only be half of the transformer rating.

You can easily use it for +/-12 volt supply. However, if currents are different for the + and - circuits, the voltage would be slightly more on the circuit that has less current draw. Also, with a light load on the 12 volt windings, you will see voltages closer to 17 volts. If you need +/- voltages to be equal, you will need regulators.

I'm curious what the application is that requires such a large current? Maybe a power amplifier? If so, the current draw should be equal on both + and - sides.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod