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Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
Well first, a gate drive transformer takes your outputs from the UCC gate drivers and turns it into an output for each of the fets on the halfbridge.
So you have a ferite core, three equal wires twined together, turned around the ferite toroid. 1 wire ( the primary) goes to each output of the UCC gate drivers. lets say your getting 5vac on the primary of the GDT, then your other 2 wires, your secondarys will both have 5vac on them as well, and each wire goes to one of the fets, it depends how its actually hooked up weather you are using a half bridge or fullbridge. There are some examples. Hopefully you understood what I was trying to say.
Registered Member #256
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Posts: 124
i kind of see what you are saying, if im right, u put in 5 volts per say and each other wire also is energized to 5 volts? and i would m,ost likely be usng a half bridge for now becaus of simplier construction
Registered Member #256
Joined:
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Posts: 124
so it could be better to run it like that if you are shooting for big streamers because the energy is dumped into the coil faster? or is this just to spare the components very harsh operation, i know a little about duty cycles from welding, except instead of milliseconds, as i am assuming you are saying we are going by minutes
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
"Spare the components harsh operation" sums it up pretty well. To get a big impressive spark, you design the coil to run at huge power, so much power that it would explode after a few milliseconds from overheating. Then you set up an interrupter that turns it off just before it would explode, for long enough to let the components cool down.
The DRSSTC I built is "on" for 0.15 milliseconds and then off for the next 10 milliseconds. During the "on" period, it delivers about 50 kilowatts to the discharge. But because it's only "on" for a tiny fraction of the time, it only draws about 750 watts from the wall socket on average.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Also, even if you could run a DRSSTC at 100% duty, you wouldn't get the long arcs you would get if run at short duty cycle. Remember, that most of the energy used to supply the DRSSTC during the pulse burst comes from the energy storage capacitor (big electrolytic) which is connected via very low impedance to the full-bridge. You would not be able to get the peak power necessary to run a DRSSTC from your wall outlet alone. So during the ON period, energy comes from the big cap, and during the off period, this cap gets recharged.
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solid state tesla coil
