what type of transformer is this?

Discussion in 'General Electronics Chat' started by simpsonss, Jan 19, 2010.

  1. simpsonss

    Thread Starter Active Member

    Jul 8, 2008
    173
    0
    hi,

    ABCD0006.jpg ABCD0007.jpg
    This is the smps that i bought recently. There is no model name on the transformer. So anyone has any idea on this? there is 8 pins(each side 4 pins) on this transformer. How could i draw this transformer in a form of schematic diagram? i mean the winding part.

    thank you.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You might have to ring out the windings with a meter and look on the PCB as to the connections to get the functions.
     
  3. simpsonss

    Thread Starter Active Member

    Jul 8, 2008
    173
    0
    hi beenthere,

    ABCD0009.jpg

    this is basically the connection that i trace from the PCB.Any idea?

    thank you.
     
  4. S_lannan

    Active Member

    Jun 20, 2007
    247
    2
    It's a flyback SMPS transformer.
    I would say there are two primary windings and one secondary winding.

    One primary winding would connect the drain of the switching device in the SMPS controller and the positive rail of the rectified mains.

    I'm a bit unclear about the other primary winding in the way it is connected.
    An educated guess would be to say it is there to supply the switching regulator with power.

    You seem interested in SMPS so i'll give you the names of a few books that I found really useful when i was learning about them.

    Marty Brown - Power Supply Cookbook 2nd Edition

    Abraham Pressman - Switching Power Supply Design

    George C. Chryssis - High Frequency Switching Power Supplies: Theory and Design
     
  5. simpsonss

    Thread Starter Active Member

    Jul 8, 2008
    173
    0
    ok.Usually how people draw this type of winding in the way of schematic diagram?

    thank you.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
  7. simpsonss

    Thread Starter Active Member

    Jul 8, 2008
    173
    0
    Since for the secondary side,physically i can see 4 legs there. So it doesn't mean that 2 legs for one winding? coz u mentioned that there is only one secondary winding.

    thank you.
     
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