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Universal DRSSTC Driver - Wishlist

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LAN_403

HV Enthusiast

Wed Oct 13 2010, 03:48PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068

By popular demand and with your many inputs (thanks everyone again for all your emails and PM's on the topic), we started developing a Universal DRSSTC driver last spring and now are getting ready to complete our final respin of our prototype.

Just wanted to check in on any last requests for features, etc... As discussed, our goal was to develop a completely integrated universal DRSSTC driver that could drive anything from small MOSFETs up to large CM type IGBT bricks.

Our present features:

1. High Current Push-Pull Discrete Gate Driver stage
2. Modulator (Interrupter Inputs)
a. Option 1 - Fiber Optic
b. Option 2 - BNC Connector
3. Fault Detection
a. Overcurrent (peak)
b. Max. Duty Cycle - Still up in the air as if it will be included in our final design
c. Max. Pulsewidth - Still up in the air as if it will be included in our final design
4. 10-Step LED Bargraph for peak current monitoring
5. 4"x4"x2" Custom Aluminum Enclosure (Shielded) - Anodized Black
6. Custom Engraved Aluminum Faceplates for that professional look

Our goal is to provide a one-stop universal driver for all DRSSTC needs - from small to large.
No more need to scrounge up parts, make your own artwork, and try to cut your own enclosure using a dremel and a rat tail file!

So again, thanks to everyone so far for their ideas and inputs - this will last call for any other desired features you'd like to see!

ScotchTapeLord

Wed Oct 13 2010, 04:58PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
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Posts: 635

Phase lead? Espresso maker?

HV Enthusiast

Wed Oct 13 2010, 07:03PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068

I was seriously considering the espresso maker, but thought it would be too "over the top."

Luca

Wed Oct 13 2010, 07:27PM

Registered Member #2481 Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134

Overcurrent protection based on rms current in the primary. This would save capacitors from overheating.

Luca

803

Wed Oct 13 2010, 07:30PM

Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
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Posts: 191

About price, I would like to se something under 200, 300 $s

teravolt

Wed Oct 13 2010, 07:33PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

will phase leading be avaible for the larger bricks

HV Enthusiast

Wed Oct 13 2010, 10:30PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068

Not sure what you mean by phase leading.

Arcstarter

Wed Oct 13 2010, 10:54PM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

EastVoltResearch wrote ...

Not sure what you mean by phase leading.

He means using inductance in parallel with the feedback CT for phase shift, like Finn Hammer's work. Keeps IGBT's happier, so i think it would be a nice thing to include. But, the problem is that different freq's need different amounts of inductance... Unless you can make a variable inductor

Killa-X

Wed Oct 13 2010, 11:05PM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
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Posts: 1039

803 wrote ...

About price, I would like to se something under 200, 300 $s

I would also agree to this. Also, when you say "MAX. duty cycle" do you mean a system where you can set a it to 15% duty, and if the signal from the input goes over 15% duty, it corrects it? I think its a great idea, Will be neat to see people's artwork with the whole entire DRSSTC setup, and how they incorporated it into the looks of the coil.

Will there be a manual? I can see a situation where someone, who never made a tesla coil at all, thinks this will be the easiest way to make one..just connect a few parts, done. and not consider the fact you need to still tune stuff. I guess that can be posted as a caution, I can just see it possible.

ScotchTapeLord

Wed Oct 13 2010, 11:06PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
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Posts: 635

It seems to be what all the kids are into nowadays. We're just talking about using inductance in series with the feedback CT's burden resistor to shift the waveform to make up for the delays in slower brick IGBTs. A design like the Prediktor with some potentiometers on the RC timing components for fine tuning would be a nice option.

EDIT: Ahh Arcstarter beat me to it (by two posts!)

But I believe the inductance has to be in series with the burden, not parallel. A variable inductor is the simplest way to do it (and how I intend to do it), but you can just use excess inductance and then slow it down with a potentiometer + capacitor feeding a trigger, I think. It's easier to slow things down than predict them!

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