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Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Hi everyone. I ran into a problem with the cores I am currently using. My GDT cores are 5 MHZ 19 ohm impedence (link here), and the waveforms I get on my IGBT gates have excessive drooping on the tops and bottoms. I've tried 10 turns, 15 turns, and 20 turns, nothing made a difference so I figured that the cores were not right. I came across another post here in the forum with suggested cores to be used. Here are some links to the cores I am looking at:
The N87's are a little big and expensive, I dont need something that big but I was just looking around at some cores that might work regardless. I will be using these for GDT and most likely for primary feedback and current sense. I also have these Triad Magnetics CST but I have not yet used them. Thanks for any thoughts and suggestions.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
2bytes, yes that is where I reference my excessive top and bottom drooping from. Which is why I tried more turns, and when that didn't seem to make a difference I decided to check the datasheet of the cores I used (stupid me I should have done that in the first place, but I had the cores already and didn't want to buy new ones if I didn't have to) and found the Al to be extremely low and material not sufficient for TC use.
Kizmo, thanks for suggestion I will have a look at them
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
If you need some cores, let me know, i'll send you some free samples. I have a whole variety of them now including some 2.4" diameter ferrite cores which are great for the large IGBT bricks and large current transformers.
Just send me a PM.
Link to the different types of cores we offer now for your reference:
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Kizmo, I found those cores on newark and the specs look like they would work pretty good. However I didn't do any extensive searching but I couldn't find any in the U.S. pity because they are a good price like you said.
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Which cores best for GDT and Current Sense?
