Designing a Centre Tapped Transformer

Discussion in 'The Projects Forum' started by s2pk, Jun 4, 2011.

  1. s2pk

    Thread Starter Member

    Jul 10, 2010
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    input voltage 1 = 12v
    input voltage 2 = 24v

    output voltage = 230v

    can some one help in design, what other parameters I may need??
     
  2. #12

    Expert

    Nov 30, 2010
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    Just buy a transformer with "international" primaries and (2) 12V secondaries and run it backwards. I have 8 of them that I picked up at a surplus store for $1 each. I'll wish one to you right away.
     
  3. s2pk

    Thread Starter Member

    Jul 10, 2010
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    why don't i design it myself
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
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    Where are you going to stamp out the lamination core pieces?
     
  5. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
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    Are you really trying to create 230V from two inputs, 12V and 24V, into a transformer, or do you mean it the other way around? Two outputs from a single 230V input...

    There are plenty of considerations when building a transformer, e.g. how much power does it need to provide, the right size and shape of the core, the right size wire, what is the frequency of the signals, just to name a few.
     
  6. #12

    Expert

    Nov 30, 2010
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    I actually worked in an old fashioned transformer factory with the pedal operated winding machine, the laminations hand stacked and bopped with a leather hammer, the soaking in something gooey and smelly, then cooked overnight, and after seeing exactly how it's done, I have never tried to make my own transformer, Its just too much of a PIB.

    I do resent the high prices for transformers, but not enough to go through all that!
     
  7. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Did anyone else notice this transformer has two inputs?

    Huh?
     
  8. s2pk

    Thread Starter Member

    Jul 10, 2010
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    ErnieM....... yes i noticed, i guess you haven't yet
     
  9. s2pk

    Thread Starter Member

    Jul 10, 2010
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    im working on a solar based inverter operating on voltages from 12v to 24v
     
  10. s2pk

    Thread Starter Member

    Jul 10, 2010
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    stayat as i said, a step up transformer, that can step up 12v or 24v to 230v
     
  11. s2pk

    Thread Starter Member

    Jul 10, 2010
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    frequency 50hz, output power 1000watt
     
  12. #12

    Expert

    Nov 30, 2010
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    You must have some wonderful solar cells!
     
  13. s2pk

    Thread Starter Member

    Jul 10, 2010
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    solar cell or batteries can operate my device
     
  14. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
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    For designing the transformer, I would start browsing through the material at www.ferroxcube.com. Check their application pages, they do have a power conversion application section, and their data handbook on ferrites. It used to provide a large amount of.detail concerning the design and core selection.
     
  15. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    You have a solar cell with a 50 Hz, 1000 W output? Or are you trying to make an inverter with a 12 to 24V DC input and a 50 Hz, 1000 W AC output?

    (If so, you ain't just looking at a transformer.)
     
  16. s2pk

    Thread Starter Member

    Jul 10, 2010
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    ernie im designing an inverter, as input i can use batteries or solar cells, output must be 230v, 50hz. to step up the 12v and 24v i need a center tapped transformer
     
  17. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    Got a schematic for this inverter?
     
  18. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Just from the economic point of view, have you checked if you even can get the trafo´s core, wire and isolation somewhere? Isn´t it cheaper to have it made since it will have all the electronic approval it needs to have?
    Also, have you noticed that you need about 40A at 24V to get that power? Imagine the wire size...
    If I were to pull of such project, I would buy an off the shelf 1kw inverter, or maybe a 230/24 trafo if I wanted to hassle with the inverter.
     
  19. SgtWookie

    Expert

    Jul 17, 2007
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    Well, let's see - if the transformer is 90% efficient, and you're operating at 12v for the input side, your primary current will need to be just about 93 Amperes to get a 1000W output.

    If your input is being switched at a 50Hz rate, your transformer will be very large, heavy, and expensive. If you try to make one yourself at home, you will go through many iterations trying to "get it right", and the finished product will not likely be anywhere near as efficient as a commercially produced unit.
     
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