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ny11212

Tue Apr 19 2011, 08:30PM

Registered Member #3839 Joined: Tue Apr 19 2011, 07:00PM
Location:
Posts: 8

Hi, I'm a newbie so bear with me if I don't give you complete information, or if I'm not 100% accurate.

That being said, I need to either build, or purchase a high voltage AC power supply with the following specs:

1) It runs off 110V AC
2) it ouputs a selectable range between 10 and 30KV
3) The frequency can be adjusted between 50 Hz and 3500 Hz
4) The pulse width can be adjusted between 1 Î¼s and 10 Î¼s

I've looked online, but no one seems to make this.

Any ideas?

Thanks for your help.

James

Tue Apr 19 2011, 08:33PM

Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506

Your specs are insufficient to give any really solid suggestions. How much current do you need? Does the output need to be regulated? Does it need to be current limited?

ny11212

Tue Apr 19 2011, 11:22PM

Registered Member #3839 Joined: Tue Apr 19 2011, 07:00PM
Location:
Posts: 8

The current is 2 amps, I'm not sure what you mean when you ask if the output has to be regulated... and I don't believe it needs to be current limited.

Nah

Wed Apr 20 2011, 12:03AM

Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260

Um, that is a max of 60,000 VA. Only factories would have the licence or ablity to own or build one of these, It would cost in the 100,000s. What in the world would you need one of these for? It would kill you in a second and bankrupt you too. It wouldn't operate on your wall socket too, you would overload your entire street!

Mattski

Wed Apr 20 2011, 12:22AM

Registered Member #1792 Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527

ny11212 wrote ...

Hi, I'm a newbie so bear with me if I don't give you complete information, or if I'm not 100% accurate.

That being said, I need to either build, or purchase a high voltage AC power supply with the following specs:

1) It runs off 110V AC
2) it ouputs a selectable range between 10 and 30KV

These are reasonable specs to ask for.

wrote ...

3) The frequency can be adjusted between 50 Hz and 3500 Hz
4) The pulse width can be adjusted between 1 Î¼s and 10 Î¼s

These are a bit trickier. For the frequency, are you looking for an AC output? DC output? Regulated or unregulated DC? Regulated means a constant DC voltage with low ripple. If you have a DC output then you shouldn't care about frequency, rather you care about only ripple (which generally gets better at higher frequency). If you want AC output at a particular frequency what waveform shape do you want?

Pulse width has meaning in context of a PWM switching power supply, or a pulsed output. Which do you want? If it's a PWM switching power supply, then you cannot specify pulse width because that is already determined by switching frequency and output voltage.

Given the uncertain nature of your specs, I would ask what you intend to power with this HV power supply since that should help clear up the specs.

Dr. ISOTOP

Wed Apr 20 2011, 12:25AM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

What you're asking for is almost technologically impossible - transformer cores that function at 50 Hz don't necessarily work at 3 KHz. And I have no idea what you mean by "pulse width" - do you mean the duty cycle of the inverter driving the transformer?
60KVA is a lot but not nearly impossible at higher frequencies - use a resonant topology and a full bridge of your favorite bricks.
What sketches me out is that the OP is asking for a very powerful supply without disclosing what he intends to use it for. Granted, its no more lethal than a MOT (i.e. both are guaranteed to kill you), but still...

klugesmith

Wed Apr 20 2011, 12:36AM

Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716

Mattski wrote ...
Given the uncertain nature of your specs, I would ask what you intend to power with this HV power supply since that should help clear up the specs.

Agreed.
Note that the max duty cycle appears to be 3.5%,
so if we are talking about pulsed DC with peak output current of 2 amps,
the average power output won't exceed 2100 watts.

Those microsecond pulses will be a challenge.
Maximum load capacitance for 0.1 us rise/falltime, given +/- 2 A of output current, is 6.7 pF.

James

Wed Apr 20 2011, 12:43AM

Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506

30kV will arc a heck of a lot further than 2kV from a MOT, and people have survived lightning strikes and the electric chair, so neither is *guaranteed* to kill you, but both would very likely do so if you got bit by them.

You're not gonna get 2A at 30kV out from a 120V receptacle though, it's just not possible. The standard 240V 200A domestic service in the US is "only" 48kVA to the entire house.

I don't want to come off as rude, but if you don't know what it means for the output to be regulated, you've got no business playing with a power supply anywhere near as powerful as what you are asking for. The thing would be the size of a small refrigerator and cost thousands to build.

Patrick

Wed Apr 20 2011, 03:41AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

If he means 2A at 120V, 240VA, thats more resonable. But he should know enough to have spec'ed this when we all read the top thread.

genious 7

Wed Apr 20 2011, 04:30AM

Registered Member #2887 Joined: Sat May 29 2010, 11:10PM
Location: Panama City, Panama
Posts: 107

ny11212 wrote ...

Hi, I'm a newbie

Don't even consider attempting something like that. It is physically impossible to have a transformer that can run both at 50 hertz and 3500 hertz. The transformer cores would have to be different materials. I recommend you to read about flyback trasfromers if you are interested on high frequency high voltage, or ignition coils if you are attempting a low frequency.

If this is your first project with high voltage, go either for the flyback or the ignition coil. Don't even dream making something near what you wrote as a newbie, hell, I could not make it myself. If you need help with a starter project, you can ask for further suggestions.

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