Igbt drive help with vla500 series

Discussion in 'General Electronics Chat' started by 466576266, Nov 17, 2011.

  1. 466576266

    Thread Starter New Member

    Mar 17, 2010
    HELLO, anyone. i meet with a problem recently. its about the igbt driving problem.
    as u can see from the pic, the device component selection say, the function of the R2 and R5 is :fault signal noise suppression resistor. and what i wonder is what is the really function of these two resistors, i mean, how does this resistor function as noise suppression? can someone analysis this principle for me ?thank u in advance.
  2. shortbus

    AAC Fanatic!

    Sep 30, 2009
    They look like they form a voltage/potential divider, along with R1 and R4, to supply the correct voltage to the opto-coupler.