NPC Inverter Boost IGBT Zener Clamp

Discussion in 'General Electronics Chat' started by lawcuenca, Jun 15, 2011.

  1. lawcuenca

    Thread Starter New Member

    Jun 15, 2011
    7
    0
    Hi,
    Attached is the configuration for the subject. Here are the datasheet values:
    IF = 2A
    PT = 21W
    VF = 9.07V @I=20A

    Please advise on what zener diode I can use for this.

    Thanks,
    Law
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, that would be over 180 Watts instantaneous power dissipation in the Zener, which is quite a bit. Any idea what the average power might be?

    Rod Elliot over at ESP has a page about using a transistor & low-power Zener to emulate a high-power Zener:
    http://sound.westhost.com/appnotes/an007.htm
    You'll probably find a configuration like he suggests will be a great deal easier than trying to find a Zener rated for that kind of power.
     
  3. Jaguarjoe

    Active Member

    Apr 7, 2010
    770
    90
    Search for Megasquirt's "Megamanual" and look at the amplified zeners it uses to eat fuel injector back emf spikes.
     
  4. lawcuenca

    Thread Starter New Member

    Jun 15, 2011
    7
    0
    I think it would be better if I show you the device I am referring to. I attached the datasheet of the module I am looking at right now. I cannot understand how they were able to come up with the datasheet values for boost inverse diode. Do you have any idea how?

    Cheers,
    Law
     
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