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Multiple switch mode power supplies

Discussion in 'Electronic Repair' started by N_Cook, Apr 9, 2012.

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  1. N_Cook

    N_Cook Guest

    Hopefully a hypothetical assuming cannot repair a small SMPS in a 1U case.
    Assuming 3 of those little "plug-top" , I don't know the generic name,
    "phone charger" SMPS can have the usual fudge of changing 2 or 3 resistors
    each to give +/- 15V, .2A and 5V , .5A and mains safety issues taken into
    account. Would there be an EMC or cross-coupling problem due to 3
    free-running oscillator SMPS running inside one box, often the case that 3
    would be togrther in close proximity charging 3 phones at the same time.
     
  2. Phil Allison

    Phil Allison Guest

    "Nutcase Kook = Classic Pommy Fuckwit "

    ** For get that fucked idea.

    ** 15 volt and 5 volt SMPS supplies are easy enough to find.

    You can remove the PCBs from their cases and wire the outputs as you please.


    ** No.

    Wot a fucking RETARD !!!!!!!!!!


    .... Phil
     
  3. Would there be an EMC or cross-coupling problem due to 3
    It's unlikely their transformers would have sufficient stray flux to produce
    interference.

    If you're worried, position two of them at right angles, and the third
    not-in-line with either.

    Please learn how to write a short, simple, declarative sentence! Learning
    how will give you a great sense of satisfaction.
     
  4. Phil Allison

    Phil Allison Guest

    "hr(bob) = google monkey


    Mr. Cook's question was stated just fine,


    ** Only fine if you are an autistic, dyslexic fuckwit.


    There is a slight chance that the oscillators would try to sync up,


    ** Like there is a slight chance the moon is made of green cheese.

    **** off - moron.
     
  5. N_Cook

    N_Cook Guest

    Mr. Cook's question was stated just fine, we have some grouches here
    this Monday morning.

    There is a slight chance that the oscillators would try to sync up, it
    depends on how close they are in free-running frequency and also on
    how much intercoupling there is between the electronics, as well as
    any possible flux coupling between the transformers. Really hard to
    predict!

    ++++

    So keep as separate as possible and perhaps 120/120/120 degree relative
    orientations and inversion if 2 are constrained to be close, makes sense to
    reduce that likelihood
     
  6. Please learn how to write a short, simple, declarative sentence!
    I the it any way reader let and right you it's like ? So all to write guess
    unscramble

    Mr Cook, PLEASE LEARN HOW TO WRITE simple, clear sentences. It's a necessary
    skill. When someone offers you sound advice, don't ignore it.
     
  7. Phil Allison

    Phil Allison Guest

    "William Sommerwerck"

    ** ROTFL !!

    ( see, I do say nice things sometimes .. )



    ..... Phil
     
  8. (see, I do say nice things sometimes ...)

    So why do you get so angry? Is it psychosis? Or are you just playing the
    "angry old man"?

    It's okay to criticize. You don't have to jump down people's throats doing
    it.
     
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