About transformers in a circuit

Discussion in 'Homework Help' started by charmcaster, May 6, 2015.

  1. charmcaster

    Thread Starter New Member

    Jan 13, 2015
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    some circuits contains 2 transformers. one before bridge and one after bridge. What is the purpose of using 2 transformer in a circuit?
     
  2. DickCappels

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    Aug 21, 2008
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    It would help answer your question if we could see a schematic or other illustration of what you are thinking of.
     
  3. charmcaster

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    Jan 13, 2015
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    It is PFC stage of RDR382 of led driver.
     
  4. DickCappels

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    Perhaps one is for PFC and the other is for regulation.
     
  5. Jony130

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  6. charmcaster

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    Jan 13, 2015
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  7. Jony130

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    I still do not see any transformer transformer before the bridge.
     
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  8. DickCappels

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    L1 is a common mode choke, and is usually not thought of as a transformer. It serves two purposes, both related to conducted electromagnetic interference. The most important part is that it makes sure that the same amount of high frequency AC current that goes through the line goes through neutral. It also provides inductance between the power line and the rest of the power supply. Working with C1, it reduces the amount of high frequency noise gets from the power supply to the power line.

    Now I have to close this thread because I just realized that the power supply is not isolated.

    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    http://forum.allaboutcircuits.com/showthread.php?t=54400

    Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ . Good
     
  9. Jony130

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    Hey, what about the output transformer? From what I see output transformer provide galvanic isolation.
     
  10. charmcaster

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    Jan 13, 2015
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    I think T1 is output transformer.
    Thank you!
     
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