Capacitor Type for IGBT Snubber

Discussion in 'General Electronics Chat' started by Bronchos, Sep 22, 2013.

  1. Bronchos

    Thread Starter New Member

    Sep 8, 2013
    Hi there,

    Is there any rule for selecting the type of snubber capacitor (polar or non), for IGBT Full Bridge Inverter??

    I'm about to reverse existing inverter design for induction heating. I'm in mechanical engineering.
    Here are page of the design:

    In the power stage, he used the different type of capacitor for snubber.
    What will happen if I use both polar, both non polar, and polar-nonpolar?

    Picture for his scheme:

    Thanks alot before
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    If you are talking about C9 and C10 they are decoupling or filter caps for the power supply. They can be polarized (electrolytic) from Vcc to ground.
  3. Bronchos

    Thread Starter New Member

    Sep 8, 2013
    Thanks ronv for the respond

    A though that it was snubber capacitor, for voltage spike protection, or even for achieving zero voltage switching.

    Recently, i realized, for achieving zero voltage switching, maybe the capacitor should be placed across the two switch in the same leg, not in every leg. Or, we can place 4 capacitor across each switch.

    Am I right?
  4. killivolt

    Distinguished Member

    Jan 10, 2010
    Last edited: Sep 23, 2013