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corona discharge - vendor recommendations

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John R

Wed Aug 17 2011, 11:51PM

Registered Member #4058 Joined: Wed Aug 17 2011, 10:14PM
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Posts: 5

I'm trying to make a setup in my research lab that produces corona discharge. I've thought up some parts I will need, and I was wondering if any of you might be able to recommend good vendors to me for some of the parts.

High voltage power supply - 30 kV, about 50-100 W power
High voltage voltmeter
Microammeter

Thanks!

Adam Munich

Thu Aug 18 2011, 12:18AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Build it yourself!

A 30kV meter can be made using 600 million ohms of resistance in series with a 50uA meter.

A HV psu can be made by powering a flyback transformer with a ZVS driver. The high voltage can be adjusted by varying the input voltage.

Forty

Thu Aug 18 2011, 12:27AM

Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649

are you testing materials with it so accurately that you need to know the exact voltage and current or do you just need corona?
measuring the hv can be done with a normal meter and a voltage divider.

if you can get a flyback transformer like those (non-rectified) then you can probably crank 30kv out of it with one of these

buying a pre-made hv supply like that would be pretty foolish unless you need a fair amount of accuracy in your experiments, so let us know more about your application.

there's always tesla coils cw multipliers too. those can be good at making corona.

John R

Thu Aug 18 2011, 12:42AM

Registered Member #4058 Joined: Wed Aug 17 2011, 10:14PM
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The application is to study the chemistry that takes place when you have corona through a nitrogen/oxygen mixture. I believe we do need a fair amount of accuracy for the sake of reproducibility and reporting.

Adam Munich

Thu Aug 18 2011, 12:45AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

What type of accuracy? +/-1kV is pretty achievable if the currents are very low, as is the case with corona.

Dr. ISOTOP

Thu Aug 18 2011, 12:54AM

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

If you are trying to measure DC, you can get away with a cheap divider-on-a-stick meter, which can be had from Ebay for ~$20.
Commercial HV supplies are not cheap. If you want to build your own, I suggest a ferrite transformer + a small multiplier + a hard-switched IGBT bridge with PWM to regulate output voltage.

John R

Thu Aug 18 2011, 01:01AM

Registered Member #4058 Joined: Wed Aug 17 2011, 10:14PM
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Posts: 5

Grenadier wrote ...

What type of accuracy? +/-1kV is pretty achievable if the currents are very low, as is the case with corona.

I'm not 100% certain on this. +/- 1kV might be small enough for us, but I can't say for sure right now.

bwang wrote ...

If you are trying to measure DC, you can get away with a cheap divider-on-a-stick meter, which can be had from Ebay for ~$20.
Commercial HV supplies are not cheap. If you want to build your own, I suggest a ferrite transformer + a small multiplier + a hard-switched IGBT bridge with PWM to regulate output voltage.

I don't think I'm familiar with divider-on-a-stick meters. Also, do you have recommendations for where to look for some of the other components you mentioned?

jpsmith123

Thu Aug 18 2011, 02:36AM

Registered Member #1321 Joined: Sat Feb 16 2008, 03:22AM
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Will you be working with AC or DC high voltage (or both)?

John R

Thu Aug 18 2011, 02:46AM

Registered Member #4058 Joined: Wed Aug 17 2011, 10:14PM
Location:
Posts: 5

For the first stage of the experiment, we were just going to use DC. Eventually it might evolve into a setup that uses AC.

Dr. ISOTOP

Thu Aug 18 2011, 03:02AM

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

John R wrote ...

Grenadier wrote ...

What type of accuracy? +/-1kV is pretty achievable if the currents are very low, as is the case with corona.

I'm not 100% certain on this. +/- 1kV might be small enough for us, but I can't say for sure right now.

I don't think I'm familiar with divider-on-a-stick meters. Also, do you have recommendations for where to look for some of the other components you mentioned?

Divider on a stick:

Literally a voltage divider with a panel meter, on a cute safety stick.
Source your components from Ebay, Digikey, and TSC Ferrite International.

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