Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Problem in Flyback Transformer

  1. May 18, 2013 #1
    Hi friends,

    I am trying to design a Flyback converter(Vin=15 volts, Vout=15 volts, fsw=140kHz) in general purpose PCB. The Mosfet(IRF510) is being driven from TL494. I have checked that the mosfet is being successfully driven by TL494. But after connecting the transformer(E 16/7/6) in sec side, I observed some notches for usec duration instead of a square wave voltage. I have checked the xformer separately after winding it by giving signal from a SIGNAL GENERATOR, where the output is coming correctly.
    Can anyone suggest me any tests that can be done to sort out the cause of the xformer malfunctioning, which will be of great help to me.
    Thanks in advance.

  2. jcsd
  3. May 18, 2013 #2

    jim hardy

    User Avatar
    Science Advisor
    Gold Member

    I'm sure you know what you mean , but those words do not paint a picture in my mind.

    "notches" ? TL494 does have "dead time" per datasheet.

    At 140 kHz a whole cycle is only ~7 microseconds and each half of a square wave is just 3and a half microseconds.
    How wide are these usec "notches" ?
  4. May 18, 2013 #3
    It would help greatly if you could show a detailed schematic of your setup and, if possible, include a dump of your waveforms. A datasheet (if available) for your transformer would also be appreciated.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Problem in Flyback Transformer
  1. Transformer Problem (Replies: 4)

  2. Flyback diodes (Replies: 21)