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Forums
4hv.org :: Forums :: Tesla Coils
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First DRSSTC

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colin heath
Fri Feb 24 2006, 08:32PM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
HI,
Totally agree with dan being a builder of halfbridge coils. however i dont see why you need 2 transformers? Unless you mean to drive big devices like the hgt1n40n60a4d.
cheers
colin
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williamn
Sat Feb 25 2006, 04:47AM
williamn Registered Member #55 Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149
My little coil uses a halfbridge of 30n60s. The general consensus is, for your first DRSSTC shoot for as low a frequency as you can and use a halfbridge.
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Marko
Sat Feb 25 2006, 12:06PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Well hope IXSH40N60 will be enough, I could have used thinner wire and lower the frequency to maybe 200khz, but its done now.

What im afraid that my secondary will arc to primary, so i must not use too many turns (rather biger mmc, about 60 -70nF is OK) and 6 turn copper pipe primary.
I calculated this is around 300khz, as TCCAD says for secondary (wintesla doesnt support my gauge) so primary is done too.
I must be sure not to get out of resonant frequency rolleyes

ALso I intend tu build primary feedback driver, there i'l probably need help.

cheers...



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colin heath
Sat Feb 25 2006, 08:07PM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
Hi Firkragg,
Honestly dont worry about 300KHz I ran 2 of my 3 drsstc at this or above without taking any special precautions tongue
As far as feedback i would go with secondary base current feedback to begin with as you wont need current limiting if your careful.
The primary sounds fine also.
Cheers
Colin
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williamn
Sat Feb 25 2006, 09:38PM
williamn Registered Member #55 Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149
If you do get primary to secondary acrs, just reduce K until it doesnt happen any more. I had severe racing sparks until I fixed the couling issue. My little coil uses quite low coupling.
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Marko
Sat Feb 25 2006, 09:45PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Coupling will not be high, primary will be about 3 cm away from secondary and il try to use fewest windings possible.
But im scared to blow up my igbts...
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HV Enthusiast
Sat Feb 25 2006, 10:11PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Firkragg wrote ...

Coupling will not be high, primary will be about 3 cm away from secondary and il try to use fewest windings possible.
But im scared to blow up my igbts...

You more than likely will blow them up at least once. Not being harsh, but its just a matter of fact. I don't think anyone here has built their first DRSSTC without blowing a few pieces of silicon . . .

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vasil
Sun Feb 26 2006, 11:07AM
vasil Registered Member #229 Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
You can use first lower input voltage, until you are sure that all the problems are gone. Monitorise gate signals, temperature of the IGBTs, regulators and driver chips, noise problems with your interrupter, heat dissipation in your primary caps, output, pri-sec breakdowns, res frequency variation, etc.
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Marko
Sun Feb 26 2006, 09:43PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Here is the bridge, in most simple mode.
Probably I should use more pšrotection circuits.
For feedback current transformer in series with primary will be used.
Maybe caps are not large enough, they are about half (in joules) than steve ward's mini DRSSTC schematic ??

1140990223 89 FT2083 Bridge
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HV Enthusiast
Sun Feb 26 2006, 10:54PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
You should have some gate resistance in series with the gates, otherwise you may have some oscillation problems at the gates. Typically, a small resistor is used and then you can use an opposing diode in parallel to help with turn-off.

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