Ne555 output to igbt gate with isolation

Discussion in 'General Electronics Chat' started by captainssbn, Jul 9, 2013.

  1. captainssbn

    Thread Starter New Member

    Sep 24, 2012
    Hi All
    I need some help with my motor controller design. I have an NE555 output of 2.5ms or less pulse that needs to turn on an IGBT Gate. I need the circuit to be isolated from the NE555 circuitry. How can I use an Opto Isolator to do this? I have some IXDD614 drivers Ua7815 power Ics. also available is a power transformer output of 30VAC. the NE555 circuitry is using the other transformer output to get 15vdc. So the second transformer output I think will give me an isolated DC needed in the Opto output and driver circuitry.

    Does anyone have a working schematic?

  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    'Why cant you use a Mosfet to drive the output instead of an IGBT, that way you don't need a gate drive resistor, have you got a diagram of your circuit?

    or if you need to use an opto , which seem a waste of time, then use a 4N35 series
    Last edited: Jul 9, 2013
  3. ian field

    AAC Fanatic!

    Oct 27, 2012