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Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
Hey All,
Its been awhile since I've done anything with Tesla coils. I'm thinking about converting my OLTC to a DRSSTC
I have 2 of these half-bridges:CM400dy-50h They're pretty slow, but my coil is around 30-35khz so I'm hoping they will work out ok.
I working on the gate drives right now, and I was wondering if I can drive these big bricks using a gate drive transformer? Or would it be better to drive them with individual isolated gate drives?
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
If you could get a GDT to work I imaging that would be a lot better and easier. Im not sher if it will work you just have to try it out, I have seen it done with Cm300 before thow.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
The gate charge doesnt look too awful on these things. The higher voltage capability brings up numerous design possibilities (problems?).
Id suggest using a GDT as well, but it needs to be driven by a really good, low impedance driver. I think Aron probably used a step-down GDT to drive his CM1000's from a really low source impedance. Ive used a 24V gate drive i designed for 1:1 GDT use to drive up to 4 CM300 half-bridges in unison.
The higher voltage capability is appealing because it allows you to use a higher tank impedance and/or get a really fast rise time on the primary energy. The drawback is figuring out a low inductance way of stringing up enough lytics or something to form your DC link at 1600V . It would be a step backwards to use these devices at anything less than 1300V id say, if you just want to use 240VAC line doubled, then get some CM600s or CM300s off ebay. Not to say that you *cant* run your parts at 650V, its just not very good utilization of what you have.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Jrz126 wrote ...
Hey All,
Its been awhile since I've done anything with Tesla coils. I'm thinking about converting my OLTC to a DRSSTC
I have 2 of these half-bridges:CM400dy-50h They're pretty slow, but my coil is around 30-35khz so I'm hoping they will work out ok.
I working on the gate drives right now, and I was wondering if I can drive these big bricks using a gate drive transformer? Or would it be better to drive them with individual isolated gate drives?
If you're a student, I can send you some 30A IXYS Gate drivers and a core. These should work perfectly for your set-up.
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DRSSTC Build gate drive question
. It would be a step backwards to use these devices at anything less than 1300V id say, if you just want to use 240VAC line doubled, then get some CM600s or CM300s off ebay. Not to say that you *cant* run your parts at 650V, its just not very good utilization of what you have.
