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Registered Member #267
Joined: Mon Feb 27 2006, 09:44PM
Location:
Posts: 46
TheBoozer wrote ...
Check out Steve's simplest of doublers at Overall bus capacitance is only 500 µF because the capacitors are in series.
Are you asking about the peak in the tank circuit of the minibrute or peak it pulls from the wall?
I have minor spikes in my first coil. It looks like ringing at switch time. This is why I stay within 2/3 of the IGBT's voltage rating. I've been focusing on a stronger gate drive and better matched gate resistor. I also believe latency between my primary CT and the actual output of the GDT is the culprit. A GDT driver with faster response time would probably make things smoother.
Snubbers and would be fine for a finished coil in my opinion. My coil is in development. A properly made RC snubber (wastes power) would probably eliminate my spikes, but as I work on increasing the input supply voltage, and also redesigning my primary for higher peak currents, I would expect the spikes to resurface.
When it comes to switching, the Prediktor is a classic example of how to approach perfection without using protection...
Yeah, that's a standard full-wave voltage doubler.
Do you know both the peak power in the tank circuit and the peak power from the wall for the mini-brute? I was just curious about the cost of a transformer that would step up the voltage (instead of the doubler), so I need a power level before I can determine the cost.
I am also going to stay within 2/3 of the IGBT voltage ratings for my coil.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
Do you know both the peak power in the tank circuit and the peak power from the wall for the mini-brute?
For high reliability, the tank circuit should have its overcurrent detector kick in around 500 amps. I don't think the Minibrute is much over 1200 Watts in general. This of course, depends on what pulsewidth and frequency its running.
Registered Member #267
Joined: Mon Feb 27 2006, 09:44PM
Location:
Posts: 46
SteveC wrote ...
Do you know both the peak power in the tank circuit and the peak power from the wall for the mini-brute?
For high reliability, the tank circuit should have its overcurrent detector kick in around 500 amps. I don't think the Minibrute is much over 12000 Watts in general. This of course, depends on what pulsewidth and frequency its running.
... not Russel! Registered Member #1
Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052
I've snipped some posts to keep this thread from getting sidetracked. Everyone please remember to be courteous; personal attacks are not appropriate on this forum.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Magnetomotive,
Some resources to use for DRSSTC design:
1. Steve Wards designs - I consider these benchmark designs for any DRSSTC. Check his website
2. This Forum - Read past DRSSTC threads. Lots of valuable information, especially if you check old archives back to the 2003-2004 timeframe.
3. My DRSSTC books. The first book deals more with overall theory and earlier design plus PSPICE simulations and test data. While the miniBrute book is a highly detailed HOW TO (Plans) for a reference DRSSTC design.
4. Steve Conner's website has some good DRSSTC info and PSPICE simulation as well.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Think it would be worth wikifying that thread? If so, I'll have a try at it.
As to the peak power of DRSSTCs, it's surprisingly high. I measured 50kW from my Mjolnir coil (10J of energy delivered in 200us) and I imagine the MiniBrute would be about the same. Steve Ward's big coils are probably getting on for 500kW.
The "peak" power from the wall is whatever you want it to be: you set it with the break rate on your interrupter. But peak is almost certainly the wrong word in this context, since the DC bus capacitors smooth out the power draw, and very short peaks don't blow fuses and breakers, except in so far as a peaky waveform implies poor power factor and excessive RMS line current. You probably meant average power, and in my case that was about 1kW to make decent-sized sparks.
Also the original poster used the wrong terms for bridge topologies, there's quite enough confusion going around as it is. H-bridge is not an abbreviation of half-bridge, in fact it's just another name for the full bridge (because the schematic of a full bridge looks similar to the letter H)
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Steve McConner wrote ...
Think it would be worth wikifying that thread? If so, I'll have a try at it.
I don't know if you are asking me, but I think it's a good idea. Back when I created that thread, I was looking for all the DRSSTC information I could find, and a lot of crucial information turned out very hard to find, particularly regarding the tuning. I looked through most of the tesla coil archives and those were the threads that I found to be most useful.
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Designing a DRSSTC from scratch
