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Drain to Source TVS selection for H-Bridge - ok to use unidirectional

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swordfish

Thu Jul 18 2013, 12:11PM

Registered Member #3218 Joined: Mon Sept 20 2010, 10:42AM
Location:
Posts: 29

Hi all,

I'm currently building a H-bridge for an SSTC using IRG4PF50WD IGBTS. I'm curious to know if its ok to use a unidirectional TVS from the drain to source for over voltage protection?

I assume so, I'm just not sure if it will be destroyed if it decides to conduct the free wheel current rather than letting the diode in the IGBT do its job?

I blew up a drain to source unidirectional TVS on the weekend and thought that might be what caused it.

Appreciate your advice!

Greg.

HV Enthusiast

Thu Jul 18 2013, 02:41PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

Yes. Recall that the IGBT already has an internal diode, so that will clamp well ahead of any TVS which is much higher voltage and much slower as well.

swordfish

Fri Jul 19 2013, 05:01AM

Registered Member #3218 Joined: Mon Sept 20 2010, 10:42AM
Location:
Posts: 29

Awesome, thanks Dan.

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