Transformer design?

Discussion in 'General Electronics Chat' started by Jaybee55, Jan 16, 2013.

  1. Jaybee55

    Thread Starter New Member

    Jan 16, 2013
    Hi guys,

    I have need to add a few AC adapters before a load.
    ASCII art example

    |----240v--------|AC adapters|----------------|Load|--------|

    240v is the AC mains supply. 35A max

    I know that the AC adapter will have a voltage drop(I * R), which will reduce the voltage supplied to the load. How can I design this connection/the adapters in a way which will result in the minimum voltage drop across the adapters but yet able to squeeze enough power from it?
  2. crutschow


    Mar 14, 2008
    You question is confusing. What output voltage and current do you need?

    What do you mean "minimum voltage drop across the adapters"? Do you mean minimum power loss?
  3. ScottWang


    Aug 23, 2012
    About the adapters, adapter is convertor, whatever it is a dc-dc or ac-dc, they always has the conversion efficiency problems..

    Input watt : W_in = 240V * I_in
    conversion efficiency : 90% (lost 10% energy)
    Back up for plenty current : 10~30%
    Output watt W_out = 24V * 35A = 840W
    W_out = W_in * 90% * (1+30%)
    W_out = 240V * I_in * 90% * (1+30%)
    You can calculate the I_in by your own.
  4. Jaybee55

    Thread Starter New Member

    Jan 16, 2013
    Sorry for the unclear post.

    Here a picture of what i am trying to implement.

    Current circuit:

    What I hope to implement:

    Single phase AC
    Yellow = Live AC
    Blue = Neutral AC
    Red = +15v
    Black = gnd

    I have never deal with adding anything in series to a load, how will it affect the circuit? What kind of device/transformer should i be using to minimize the effect of the additional circuit?