Electronic – Series Connected Secondary Transformer

seriestransformerwinding

I have a multiple-winding transformer with the following configuration:

  • primary: 230V
  • secondary: 2x 10-12-15V
  • frequency: 50Hz
  • power : 66VA
  • current: 2x 2.2A

66VA-2A2 transformer

As far as I can understand from its specs the connection should be done like this:

  • the primary coil should be connected to the main's AC by using the pair 4-7
  • for the secondary coils we can connect the pin as following:
    • to get a 10VAC we may use the pair 9-12 or pair 2-17
    • to get a 12VAC we may use the pair 9-13 or pair 2-18
    • to get a 15VAC we may use the pair 9-14 or pair 2-19

multiple winding transformer

I think it's obvious how to get a 10VAC or 2x10VAC from this transformer, right? The same apply for the 12/15 VAC outputs.

I know that in general we can connect these secondaries either in series or in parallel (thus increasing the secondary voltage or the current rate).

So my questions are:

  1. I'm wondering if it's safe to assume that by connecting the pair 9-13 in series with 2-18 I could expect to get a 24VAC. The same for 9-14 with 2-19 which should give a 30VAC.
  2. It is safe to assume that by connecting the pin 9 to 13 then 13 to pin 2 I would get a 24VAC between pins 9-18 ?

Assuming that the both questions above would get a YES answer, what else should I know before doing that? Any tips?

Best Answer

I'm wondering if it's safe to assume that by connecting the pair 9-13 in series with 2-18 I could expect to get a 24VAC. The same for 9-14 with 2-19 which should give a 30VAC.

I think it's a safe bet that if you series connected the windings you get twice the voltage so, for instance 9-13 in series with 2-18 would give you 24 V AC. Ditto for 9-14 and 2-19 to give 30 V AC.

It is safe to assume that by connecting the pin 9 to 13 then 13 to pin 2 I would get a 24VAC between pins 9-18 ?

You cannot connect pin 9 to pin 13 under any circumstances (unless you want to burn out a winding).

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