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Transformers

Discussion in 'General Electronics Discussion' started by Karthik rajagopal, Apr 10, 2017.

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  1. Karthik rajagopal

    Karthik rajagopal

    225
    7
    May 9, 2016
    Hi all,
    I got a PCB from a VCR which has a tiny transformer in it. I am not sure whether it would step down 220v to a lower AC voltage. I typed the code written on the side of the transformer in Google but did not get any info regarding the transformer . I have attached the photos of the transformers. Please help me in getting the basic information on this transformer Thanks in advance.

    DSC_0031.JPG

    DSC_0032.JPG
     
    Last edited by a moderator: Apr 10, 2017
  2. Minder

    Minder

    3,007
    640
    Apr 24, 2015
    It is a transformer for a SMPS (switch mode power supply).
    Higher frequency application that 50/60Hz.
    Could also be a double mode choke.
    M.
     
    Last edited: Apr 10, 2017
  3. davenn

    davenn Moderator

    13,657
    1,888
    Sep 5, 2009
    YES, they are chokes NOT transformers
     
  4. Karthik rajagopal

    Karthik rajagopal

    225
    7
    May 9, 2016
    Thanks for the reply.
     
  5. Karthik rajagopal

    Karthik rajagopal

    225
    7
    May 9, 2016
    Thanks for the reply. Just after your reply I came to know about these chokes . Searched in Google for me to get further information on that. But still not able to understand the exact function and its role in circuits. Please give me brief explanation so that my understanding becomes clear.
     
  6. davenn

    davenn Moderator

    13,657
    1,888
    Sep 5, 2009
    They are used on the mains input before the bridge rectifier they along with capacitors are filters to stop switching noise from the SMPS from getting back out onto the mains line

    L1 between C1 and C2 ......
    [​IMG]


    EM1 between C1 and C2 .....
    [​IMG]
     
  7. Karthik rajagopal

    Karthik rajagopal

    225
    7
    May 9, 2016
    Thank you so much for the explanation.
     
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