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Registered Member #1523
Joined: Sat Jun 07 2008, 02:05PM
Location:
Posts: 97
I have a few experements I want to do.
But first, I need to rectify my NST.
Everything I have seen on rectifing NST's, is to put a large, expensize, Full bridge rectifier on the out put of the NST.
HOWEVER! wouldn't it be cheaper and easier too put a full bridge rectifier on the INPUT of the NST?
I wouldn't have to deal with the 15kv. And it should work, as the amperage will still vary, it just wont go negitive.
Also, just checking to make sure I know what I am talking about: To rectify means to convert AC into "chopped" DC, Generaly VIA using Four Diodes (Full Bridge Rectifier).
Registered Member #1902
Joined: Fri Jan 02 2009, 07:59PM
Location: Lancaster, NY
Posts: 75
ummm i could be wrong but the cores used for nst are for ac only, any attempt in rectifying the input would saturate your core. your best bet would be to put a string of diodes on the secondary side. many diodes can be used to increase the voltage rating, they can be slow diodes as the output is most likely at 60hz.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
If your NST is large-ish and the case isn't plastic then it's a 60Hz NST. For the newer high freq ones, you would need faster diodes like the UF4007. Also, as I have heard, the newer versions don't like loads that have a low voltage drop like an arc so they won't work for a tesla coil.
banned on 5/26/2009 Registered Member #1877
Joined: Mon Dec 22 2008, 02:03AM
Location:
Posts: 147
to put it at its simplest, DC doesn't transform very well >_> just use a bunch of small series diodes... they wont be very expensive, as the only need to handle like 30 or 60 mA. a freind of mine bought 1000 , 1000volt 1a diodes for 10 bucks at mouser.
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Afaik SSNST works well with DC supply, although it's not what you need about the output it's still a way to feed it off a UPS or any other non-sine step-up convertor ;)
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
EvilTesla-RG wrote ...
KK,
I'll buy four 15KV diodes, and make a full bridge on the output.
You will need diodes with a PIV (peak inverse voltage) of higher than 15kV because 15kV is just the RMS voltage. The actual peak voltage is ~21.2kV. I would recommend using diodes with a PIV of more than 25kV just for a safety margin. Using strings of lower PIV diodes is a cheap way to make your own HV diode.
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NST question
