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Transformers - Frequency of AC?

Discussion in 'Electronic Design' started by [email protected], Apr 15, 2008.

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  1. Guest

    Transformers work on AC current, but does the frequency matter? Do
    different transformers have different working frequencies?

    Is it possible to use a transformer with a 50KHz chopped DC source?

    Thanks.
     
  2. Phil Allison

    Phil Allison Guest

    ** Yep.

    ** Yep.


    ** Not unless the resulting chopped wave has no DC component to it.



    ..... Phil
     
  3. Guest

    Yes, and it depends on the circuit.
    Yes, but it's a bad idea for several reasons. What are you trying to
    do?


    Mark L. Fergerson
     
  4. Guest

    I was trying to increase the DC voltage of a source, and I figured
    that switching it on/off rapidly would kind of emulate AC (at least in
    the physics sense - that's my background - the current is changing and
    do the transformer works).

    Why is it a bad idea? I can only guess that the current change it too
    rapid, and so you get huge voltage spikes?
     
  5. Eeyore

    Eeyore Guest

    Yes. The inductance of windings increases with frequency for starters.

    If so designed for sure. You would typically use a ferrite core.

    Graham
     
  6. Eeyore

    Eeyore Guest

    How do you think a flyback PSU works ?

    Graham
     
  7. Phil Allison

    Phil Allison Guest

    " Graham Stevenson "


    ** Yet another non sequitur question from this pathetic usenet TROLL.

    Symptomatic of Stevenson's deterioration into the depths of autistic self
    obsession and mental isolation.




    ....... Phil
     
  8. Guest

  9. Guest

    It is often understood that transformers DO NOT work with DC due to
    the effects of overheating resulting from huge hysteresis losses.
    There has got to be a reversal of flux and that reversal must take
    place BELOW the X axis . DC in any form is DC if the values remain
    above the x axis. I have had transformers exploding and burning out
    when my students carried out these experiments. We are aware that emf
    in the secondary is based upon mutual induction....right???
    Regards and hope I am right!
    Elstan
     
  10. Guest

    are aware that emf
    I am aware that the magnetic field due to the primary induces a
    current in the secondary... with the turns ratio providing step-up/
    down.
     
  11. Rich Grise

    Rich Grise Guest

    They indicate the winding direction so you can keep your polarities
    straight.

    Hope This Helps!
    Rich
     
  12. Phil Allison

    Phil Allison Guest

    "Joel Koltner"

    ** Hardly a sensible comment about one of the most useful things ever
    invented.


    ** Now you have abandoned the subject of " transformers " altogether.




    ........ Phil
     
  13. Phil Allison

    Phil Allison Guest

    "Joel Koltner"
    "Phil Allison"

    ** Its nothing more than a comment about yourself - ie you find them
    boring.

    Shows only how naive and unimaginative YOU are.


    ** So YOU have got up on your favourite hobby horse and riding it for all
    it is worth.

    How fucking boring !!!!!


    ** Transformers and inductors are separate things.

    Best not confuse others by confusing the two.



    ....... Phil
     
  14. Phil Allison

    Phil Allison Guest

    "Joel Koltner"
    "Phil Allison"


    ** Koltner has selectively snipped all the important bits out of my
    previous post to him - like most assholes do.


    ** No - it just makes you look a complete ass.

    Heeee, hawww, heeee, hawww...



    ** That is absolute BULLSHIT !!

    You are clearly another PITA troll without a clue and full of your own
    imagined self importance.

    SO **** OFF WANKER !!




    ....... Phil
     
  15. Phil Allison

    Phil Allison Guest

    "Joel Koltner Snipping TROLLING Fucking Nut Case


    ** Go look in any parts catalogue

    - you stupid fuckwit.


    Then GO DROP DEAD !!!!!



    ...... Phil
     
  16. J.A. Legris

    J.A. Legris Guest

    It's not necessarily a bad idea, and is often a very good one.

    If all you need is a solution, consider buying a DC-DC converter
    module, a neat little package that chops up your DC and reassembles it
    for you at another voltage, often without a transformer.

    http://en.wikipedia.org/wiki/Switched-mode_power_supply

    How much voltage do you have and how much do you need? How much power?
    What's the application?
     
  17. Phil Allison

    Phil Allison Guest

    "Joel Koltner"


    ** My god

    - you are a fucking moron, Koltner.



    ...... Phil
     
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