220 to 110 Volt Transformer Question

Discussion in 'General Electronics Chat' started by surfline, Jan 7, 2010.

  1. surfline

    Thread Starter Active Member

    Aug 12, 2009
    30
    0
    Hi,

    There are many commercial 220 to 110 volt transformers to purchase. I'm assuming this is a typical 2:1 step down transformer. If you hooked 110 Volt's to the primary side would it be possible to obtain 55 volts on the secondary side?

    I need a 1500+ Wattage 2:1 transformer with a 110 input and anywhere from 30-60V output and the 220 - 110 transformers are much cheaper, so was wondering if I could use them instead?

    Thanks,

    Surfline
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You can use one but it has to be twice the required wattage, otherwise its core will saturate and it will fail.
     
  3. surfline

    Thread Starter Active Member

    Aug 12, 2009
    30
    0
    We're using lower voltage than generally used at, so wouldn't it be the opposite way around?
     
    Last edited: Jan 7, 2010
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Yes, you are right but the current will be twice if the rated power is required because the voltage is halved. Therefore, you need a transformer with twice the power rating as to be able to handle this doubled current.
     
  5. Skeebopstop

    Active Member

    Jan 9, 2009
    358
    3
    As long as the frequency is similar you should be fine. As mike says, just check the kVa rating (that is how transformers are typically rated). If you stay within this, 240VAC or 110VAC doesn't really matter.

    The only other downside is that the 240VAC will probably be a bit bigger because of the additional insulation requirements at that voltage, but this should typically be small enough to ignore really.
     
  6. eng_mohamed ali

    New Member

    Dec 26, 2009
    4
    0
    مشكوووووووووووووووووووو
     
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