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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
At first it may have sounded as a bad idea for a TC supply, but after seeing Steve Conner's SGTC 2 with doublers I tought if something similar can be done by using mains directly, maybe for smaller coils (bonus from recent micro-TC mania).
Here I had only a small number of required caps (few 3,3 4,7 and 10uF 350V caps), built into a simple 5 stage CW. Nothing usable yet, there was a small 1mm spark (about 1500V from 110 volt input). Peak current was high and spark was pretty loud.
At 100V in I could use a 20W bulb for ballast but it died on full pwer.
For a real supply number of stages should be maybe 10+, for some 12kV output with 220V mains (with seriesed 350V caps) This can be doubled with resonant charging choke.
Big problem is inrush current, wich causes entire CW to discharge into spark gap wasting power and stressing the diodes, and I don't know if chargibng reactor is able to stop it fully.
Maybe with fast SRSG and enough inductance there it wouldn't be that bad (guessing from Steve Conner's work again)
Big resistor would help but it would also burn lots of power.
With enough caps, diodes and luck, could such a CW be of use n TC's, ? It's relatively cheap and simple, and pretty indestructible because of incomnplexity but can such a thing beat things like flybacks and small transformers, regarding overall cost, simplicity, power, etc.? Somebody could make a pretty powerful supply using some 100uF caps , but is it really worth (ZVS + flyback is usually considered more 1337 and neat, and maybe smaller for given power) ?
It behaves different than transformers and stuff, because of high peak current it gives when output is rapidly loaded. Output voltage drops quite a bit under continuous load:
Vdrop = [i] * (4n3 + 3n2 - n)
(I have no clue for mine since I used various caps, and i'm lazy )
Maybe i'm just etting bored, but I'l consider getting some caps and big bunch of diodes with my next conponent 'shopping'.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
Hey, I've done something like this befor only I used a small disposable camera flash inveter instead of mains. Then i just made a multiplier and on the end stuck a capacitor and added a small spark gap. It made small 1cm sparks from a tesla coil but bigger 4cm ones from a flyback.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I had some caps arrived with last shipment, and 4007's too. This will be more for poor people here on balkan as simple and acessble power source for mini coils, altough flyback may sometimes be just simpler to scrounge up (for some).
I calculated that such approach is just about as costly as NST's regarding power, so it doesn't seem to be some great solution as NST replacement.
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CW multiplier power supply for small SGTC's?
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