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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
I have read that Zeners are a good idea to add to the H-Bridge for extra protection. I choose some 20v 1W zeners and just want to make sure where they go.
Does it go across the Gate and the Source pin and do I use two back to back for each fet or just one for each.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes to both. You need two zeners back to back in series, because if you only used one, it would break down at 0.7V in the reverse direction. This would clamp the voltage on the GDT and prevent the other FETs from turning on.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
like so ?
EDIT: Also I have a couple ferrite cores here and I was wondering if I need a special one, I have this one on mouser
But I also have some already, I have two that are yellow with one white side, that came from an old PSU one is quite large (30mm in dia and 11mm in width) Plus I have some regular ferrite (value unknown) solid black and they come in various sizes.
Would the large yellow one work or should I spend the money on the one from Mouser?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Those yellow ones will definately not work. They are powered iron cores, not ferrite cores.
The other two appear ferrite, but who really knows what their characteristics are. We carry a variety of ferrite cores, or you can also purchase them from several other suppliers on the web.
Our flexiBrute type 77-1 cores will work perfectly for your application.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
EasternVoltageResearch wrote ...
Those yellow ones will definately not work. They are powered iron cores, not ferrite cores.
The other two appear ferrite, but who really knows what their characteristics are. We carry a variety of ferrite cores, or you can also purchase them from several other suppliers on the web.
Our flexiBrute type 77-1 cores will work perfectly for your application.
That looks perfect but I am trying to order all from the same place to keep shipping costs low :/
also is that the correct orientation for the Zener diodes?
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
The epcos N87 cores you linked work great. I use them for all my mini sstc's and CT's. But I use the ones that are epoxy coated, just to protect it from knicks and chips..
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SSTC 5 min questions
