Half bridge drive circuit

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

  1. 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

    Retired Moderator

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

    Active Member

    Mar 8, 2007
    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?