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4hv.org :: Forums :: Tesla Coils
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CM300DY-24H Frequency Limit

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slash128v6
Mon May 22 2017, 10:45PM
slash128v6 Registered Member #61415 Joined: Sun Jan 08 2017, 11:50PM
Location:
Posts: 31
Hi all,

I mistakenly picked up a set of CM300DY-24H modules when I was actually looking for CM300DU-24NFH. Anyway, now that I have them I am wondering if they would be ok for 72KHz soft switching. I am struggling with the data sheet, which says 20KHz-25KHz, but I believe that is for hard switching. I have been searching and came across another thread on this forum that seemed to suggest they would likely work up to 100KHz with sub-70KHz being preferable:

http://4hv.org/e107_plugins/forum/forum_viewtopic.php?165662

Aside from this post I am struggling to find other examples of success stories > 70KHz with these IGBTs.

Thoughts?

Thanks!

Jason
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Hydron
Tue May 23 2017, 07:21AM
Hydron Registered Member #30656 Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
I (and others) have used CM300DY-24H at similar frequencies without trouble (my coil runs them up to about 80kHz at upper pole tuning).
I had some questions here about spikes when switching, but the consensus was that it was completely fine, and I haven't had any failures:
Link2
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slash128v6
Tue May 23 2017, 06:34PM
slash128v6 Registered Member #61415 Joined: Sun Jan 08 2017, 11:50PM
Location:
Posts: 31
Awesome, thank you!
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Mads Barnkob
Wed May 24 2017, 07:49AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
You can calculate the maximum possible switching frequency from the parameters your run your coil at vs. the datasheet data: Link2
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slash128v6
Wed Jun 14 2017, 10:40PM
slash128v6 Registered Member #61415 Joined: Sun Jan 08 2017, 11:50PM
Location:
Posts: 31
Thank you Mads! I've been referencing your site quite a bit!
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