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Miniature transformer/stepdown-regulator

Discussion in 'Electronic Design' started by Iman Habib, May 7, 2006.

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  1. Iman Habib

    Iman Habib Guest

    Hi.

    I have been looking for a miniature transformers design now for a
    project but not found anything to my satisfaction. =(

    What is need is 220VAC @ 60HZ -> 5VDC and a current output at around 1A
    to 2A

    Are there any single chip ICs on the market that do this?
    (I do not need galvanic isolation)

    Cheers
    //iman
     
  2. Phil Allison

    Phil Allison Guest

    "Iman Habib"

    ** Really - explain how come.

    Your whole post seems very sus.



    ......... Phil
     
  3. Iman Habib

    Iman Habib Guest

    Your whole post seems very sus.

    "sus" what? why?

    I do not want galvanic isolation to reduce size.
    It's a thingy that is supposed to fit inside a lamp switch socket
    hole.
    So i have very little space to work in.

    //iman
     
  4. Phil Allison

    Phil Allison Guest

    "Iman Habib"


    ** Why did you just snip everything that mattered out of sight ?

    Got a lot to hide?



    ** That is a BIG FUCKING DIFFERENCE from not *needing* it.

    Answer the question I posted.

    If you can.





    .......... Phil
     
  5. Iman Habib wrote...
    You have good triple insulation? If you really don't
    need isolation you don't need a transformer. Look up
    buck converters, you'll find plenty of 340vdc off-line
    ICs. At this point I'm ready to list four or five key
    considerations. But let's just say there are serious
    pitfalls, it's best to hire an experienced engineer.

    What's your project, tell us about it.
     
  6. Rob*

    Rob* Guest

    What's inside the switching chargers Nokia & others manufacture for
    mobile/cell phones? Might be worth a starting point.
     
  7. Iman Habib

    Iman Habib Guest

    There is no need for you to be impolite Phil.
    I have nothing to hide so calm down.
    Why are you being so suspicious?

    I'm an EE student from Sweden that is just helping
    out a friend of mine for some project. He wants to shove
    a small computer and some other stuff into a switch/socket.
    Don't ask me why he wants to do it. I don't even care
    and its really not that fascinating to be honest.

    Obviously you are not capable of helping me out
    so I'll just wait and hope somebody else will give me a pointer.
    Don't bother replying Phil if you are just going to swear and shout
    at me.

    Have a nice day (you seem to be in desperate need it)

    //iman
     
  8. Iman Habib

    Iman Habib Guest

    What's inside the switching chargers Nokia & others manufacture for
    Yes. I am actually opening one right now. =)
    But the little bugger is kind of hard to open.
    Ah well.. time for the big hammer.

    thanks
    //Iman
     
  9. Iman Habib

    Iman Habib Guest

    Sorry for the confusion win.
    I really suck at using the right tehcnical words.
    You are absolutley right.
    I dont need a transformer.
    As i said to phil. I am just helping
    out a friend of mine for some project. He wants to shove
    a small computer and some other stuff into a switch/socket.
    Don't ask me why he wants to do it. I don't even care
    and its really not that fascinating to be honest. :p

    Anyway. I google around for "buck converters".
    Thank you for your help.

    //Iman
     
  10. Nico Coesel

    Nico Coesel Guest

    If it is a hobby project, I would design it with proper isolation. I
    lost a good friend because he was also sure he didn't need the
    isolation...

    The biggest problem with buck converters is that you'll need a really
    small on-time (approx 1.7%). This decreases efficiency and you'll need
    to find a high voltage MOSFET which you can switch fast enough to meet
    your requirements. Keep in mind the MOSFET must be able to conduct the
    maximum current in the load.
     
  11. Hej! :)
    There are quite a few applications that do about the thing you are
    looking for, if you look at dimmer or phase controller application notes
    on the controller chip manufacturers' pages. They usually use a small
    capacitor for voltage division.
     
  12. Phil Allison

    Phil Allison Guest

    "Iman Habib"

    ** Get fucked you bloody fake.


    ** Got any bombs tied to you ?


    ** The get him to post here.

    Meanwhile - YOU can **** off.


    ** You are an obliging criminal ass.


    ** You are a DAMN LIAR .




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

    Phil Allison Guest

    "Iman Habib"


    ** Get fucked, you trolling GG ASS.







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

    Phil Allison Guest

    "Iman Habib"

    ** You are a FUCKING Googlegroping LIAR !!!






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

    Phil Allison Guest

    ""Bjarne Bäckström""


    ** Gawd - another obliging wog fuckwit.


    ** ROTFL.

    One that gives several amps DC of the AC supply ?

    The Tooth Fairy sells them.






    ......... Phil
     
  16. Nico Coesel wrote...
    We're sorry about your friend. As for Iman - he should
    tell his friend our strong advice is that he remove the
    conduit switch box, get out his saw and install a double
    box. Then he can use safe small commercial power modules
    such as those made by Astrodyne, http://www.astrodyne.com
     
  17. Fred Bloggs

    Fred Bloggs Guest

    Hi.
    Single-chip ICs versus multi-chip ICs? Your "friend" would be
    well-advised to loose you, you're worthless; talk about the blind
    leading the blind. Why don't you try prototyping a beefed up variant of
    this:)))
    http://www.discovercircuits.com/PDF-FILES/offline5v.pdf
     
  18. Guest

    Phil does seem to have some kind of compulsion to be impolite. I want
    to see if his rather restricted range of impoliteness has improved over
    the past few months, so I'm intentionally provoking his ire.
    A sensible request, addressed to someone who isn't responsive to sweet
    reasonableness.
    Paranoia might be a plausible explanation - though there are a bunch of
    conditions associated with "rage attacks" whch migh explain Phil's
    behaviour.

    http://www.tourettesyndrome.net/rage_overview.htm
    He is.

    Still, he's probably right to warn you about the dangers of
    non-isolated mains-driven circuits. They are only to be considered if
    you know exactly what you are doing, and even then you have to keep in
    mind how you circuit might be abused by someone who thought they knoew
    exactly what they were doing. He's abused me roundly in the past for
    not being as defensive in such matters as he would like, and while I
    didn't think much of his logic, his rabid advocacy may raise enough
    consciousness to save a few lives
     
  19. Iman Habib

    Iman Habib Guest

    Well I would advise him to loose me to. =)

    I am more used to play around with non lethal current/voltage levels so
    I have unfortunately very little experience when it comes to making
    anything that is supposed to be directly connected to a household AC
    net. But I reasoned that it would be a good learning experience to read
    a bit more about it and try to solve it instead of passing it on to
    somebody else.

    Of course I am aware of the dangers and have no intention of plugging
    in anything before somebody (a teacher for eg) double-checks my
    simulations/calculations.

    Anyway I have already come across the schematic you pointed out but it
    did not quite reach me needs.

    Thanks anyway.

    //iman
     
  20. Iman Habib

    Iman Habib Guest

    The Astrodyne ultraminiature modular switching power supplies seem to
    be a very sensible option. Actually it's a great option. Thank you
    very much for the pointer.
    I will advise my friend to use one of these.

    But I will still pursue to learn more about switching power supplies
    and try and implement one myself. It's best I get my hands a bit
    dirty and learn something about this the sooner instead of later when
    it may be in a more serious circumstance.

    Again, thank you.

    //iman
     
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