Mosfet Switching

Discussion in 'General Electronics Chat' started by maxidex, Nov 26, 2008.

  1. maxidex

    Thread Starter New Member

    Nov 26, 2008
    2
    0
    Hi,

    I have a problem with my h bridge. Please check the h bridge picture.
    My DC bus is 80 V DC.
    When I begin swithing 5KHz PWM, at the middle of the PWM period a voltage appears, it oscillates about 7-8 VDC. (Please check the pictore Mosfet Switching)
    I have IR2101 gate driver and I could not understand and find the reason why this PWM has extra voltage!!! Due to dc motor inductance....?

    Please help me...

    Max
     
    Last edited: Nov 26, 2008
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    There is not enough of the circuit shown to make any determination.
     
  3. maxidex

    Thread Starter New Member

    Nov 26, 2008
    2
    0
    You are right, I added h bridge schematics.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    No component values. The speed-up diodes might do better in parallel with one of the resistors, and eliminate the other. For instance, in parallel with R11, no R12.
     
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