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Registered Member #4052
Joined: Thu Aug 11 2011, 04:43AM
Location: IN ,USA
Posts: 69
Hello, I have a question. I know that some transformers can run of of pulsed DC. so what would happen if I ran 110V mains through a voltage doubler and then sent it into a NST as 220V pulsed DC? Would the NST output plused DC or would this just fry the transformer.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I think, but I'm not certain....
Firstly, you,d need to input it in the form of a sine wave.
Secondly, the output would still be AC.
Thirdly, 110 mains AC goes from +110V tp -110V (difference between the two peaks =220V), so the output would be the same as it was before. (The doubler effectively just 'adds' the positive and negative cycles together)
I'm sure some-one will correct me about some of the above.....
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Ash Small wrote ...
Thirdly, 110 mains AC goes from +110V tp -110V (difference between the two peaks =220V).... I'm sure some-one will correct me about some of the above.....
According to American National Standard for Electric Power Systems and Equipment—Voltage Ratings (60 Hz) the RMS voltage in the USA is standardized at 120V with a permitted deviation range from 114 - 126V. In this regime, Vpk-pk min is 2√2*114 = 322.4V, and Vpk-pk max is 2√2*126V = 356.4V.
This aside, you would be better to rectify the output of the NST. You can use voltage doublers, triplers etc on the output of an NST, but the available current will be very low unless you use large, expensive capacitors, which I cannot recommend.
Take care charging any capacitors up to NST voltages!
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Proud Mary wrote ...
According to American National Standard for Electric Power Systems and Equipment—Voltage Ratings (60 Hz) the RMS voltage in the USA is standardized at 120V with a permitted deviation range from 114 - 126V. In this regime, Vpk-pk min is 2√2*114 = 322.4V, and Vpk-pk max is 2√2*126V = 356.4V.
Thanks, PM. I overlooked the RMS. (The point I was making is that, assuming you manage to turn the output from the doubler into a sine wave, the output from the NST would be exactly the same (minus losses, of course), therefore it is a pointless excersise)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Ash Small wrote ...
The point I was making is that, assuming you manage to turn the output from the doubler into a sine wave, the output from the NST would be exactly the same (minus losses, of course), therefore it is a pointless excersise
Registered Member #4052
Joined: Thu Aug 11 2011, 04:43AM
Location: IN ,USA
Posts: 69
Thanks for the info, I am not planning to actualy do this, I just wondered if it would be a cheaper way to get high voltage DC. As capacitors and diodes rated for 220V are substantially cheaper than those rated for 10,000V.
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DC from NST
