Push pull topology using SG 3525

Discussion in 'The Projects Forum' started by lovelyhakeem, Sep 20, 2013.

  1. lovelyhakeem

    Thread Starter New Member

    Dec 15, 2010
    Dear members , I have designed push pull converter using SG3525 for pure sine wave inverter ( this is first step for it ) with specs
    Input Voltage = 12 V DC
    Output voltage = 300 V DC
    transformer = ferrite core
    Mosfets = IRFZ44N
    ( i didnt used any inductor at output after rectification , just used capacitor for filtration purpose )
    Mine main problem that it work well under No load condition , but when i connect it to any load , a very sharp voltage drop occurs ( form 300 DC to even less then 100 V DC ) as SG3525 have used already built in feedback in sg3525 . Can you plz help me . I shall b very thankful to u all
    Circuit Diagram
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
    Sounds like the power conversion stage is not able to cut it. I would suspect the transformer may be saturating?

    You need an inductor on the output to filter the square wave pulses.

    hard to analyze because you did not say what load you are putting on it.
  3. lovelyhakeem

    Thread Starter New Member

    Dec 15, 2010
    Sir for testing purpose i have used 100 W bulb