Half bridge drive circuit

Discussion in 'The Projects Forum' started by pavanpidathala, Feb 7, 2007.

  1. pavanpidathala

    pavanpidathala Thread Starter New Member

    Feb 6, 2007
    Dear friends,
    This is Pavan . I am doing "250W/10A Off Line SMPS" project
    For this i selected "Half-Bridge" topology & i am using IRF830 Mosfets.Here problem is ,the "on" time of the Mosfets(which is 46% duty cycle) are not fallowing the drive circuit "ON "time(which is 20% duty cycle).And also i abserved that there is a voltage spike about 3V at both sides of pulse which is from pulse transformer.So please send me a solution for this

    with regards
    P.Pavan Prasad
  2. thingmaker3

    thingmaker3 Retired Moderator

    May 16, 2005
    Rural, Oregon GMT -8
    What is the frequency? Are you attempting to drive the mosfet too fast?
  3. ashokcp

    ashokcp Active Member

    Mar 8, 2007
    Chennai, India
    I assume that you are using pulse transformer to drive the gate of IRF830. The problem should be with the gate drive circuit. With more details I may be able to help you. What is the PWM controller used & what is the gate drive used?
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