High voltage Ac generation to apply to a capacitor

AI Thread Summary
The discussion revolves around generating high voltage AC for a capacitive load at approximately 190 kHz, with a target voltage of at least 1 kV, ideally aiming for 10 kV. Suggestions include using a resonant circuit with an inductor to increase voltage and considering a step-up transformer to boost the output voltage. The application involves creating electric fields for enhancing wine quality, which requires precise frequency and electric field management. Participants emphasize the importance of high voltage safety and minimizing radio frequency interference. Overall, the conversation seeks innovative solutions for achieving high voltage in a controlled manner.
Bailiwick
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Hi this is my first post on here

I am looking to create a large voltage across a primarily capacitive load at around 190 kHz. At the moment i have a 175 Watt power amplifier which puts out 55 Vp.

The output impedance also needs to be quite low < 100 ohms

Does anyone have any idea how to do this. I am thinking maybe some sort of resonant circuit. Or maybe I will have to make a valve amplifier. The voltage should be at least 1 kV

Any RF engineers out there? help would be very much appreciated

thanks
mark
 
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Whats wrong with a stepup transformer?
 
It transforms the impedance up by a square of the turns ratio so say I wanted 500V, ratio 1:10 wouldn't it transform the impedance up by a facto of 100
 
Why not Resonate the Capacitor with a suitable Inductor in series? You could get many times (XQ) the input voltage that way and an inductor is easy to make / buy. You need a Q of around 20, it would seem.
 
Bailiwick said:
Hi this is my first post on here

I am looking to create a large voltage across a primarily capacitive load at around 190 kHz. At the moment i have a 175 Watt power amplifier which puts out 55 Vp.

The output impedance also needs to be quite low < 100 ohms

Does anyone have any idea how to do this. I am thinking maybe some sort of resonant circuit. Or maybe I will have to make a valve amplifier. The voltage should be at least 1 kV

Any RF engineers out there? help would be very much appreciated

thanks
mark

What's the application?
 
sophiecentaur

Yes I have thought of this idea. which seems pretty good to me but is quite difficult to achieve high Q.

I was thinking if you put a secondary winding as in a transformer , would this step up the allready increased voltage that is created across the inductor?
Also what is the voltage current phase relationship in a series resonant circuit. inphase?

Berkemen

Application is electric fields across wine which were doing a bit more of,
http://www.stuff.co.nz/waikato-times/business/3190621/Better-wine-in-a-flash

Id actually prefer the voltage to be in the order of 10 kV but this may be slightly harder to achieve.
 
It definitely tastes different the hard part is getting the frequency and E field correct to make it taste better. We have found a reasonably good combination that i can't really disclose
This was confirmed on national tv by a wine critic

But I need ideas to get a wacking great AC voltage for further development
 
Bailiwick said:
It definitely tastes different the hard part is getting the frequency and E field correct to make it taste better. We have found a reasonably good combination that i can't really disclose
This was confirmed on national tv by a wine critic

But I need ideas to get a wacking great AC voltage for further development

Hopefully you and your advisors know a bit about high voltage safety, and about how to avoid creating RFI (radio frequency interference).

Keep in mind also that if you can put that voltage across a smaller gap, then it takes a lot less voltage to make the same E field. So can you make a bunch of panels or something inside the wine container that are spaced closer together, and use a more standard voltage...?
 
  • #10
berkeman said:
Interesting. Does the quick-made wine taste different?
When I saw this:
Professor of electronics Jonathan Scott ...
I about spit on my monitor. It does sound like a neat project.

BTW I'll volunteer to be a taster. :biggrin:
 
  • #11
Berkemen its across a 4mm gap and the breakdown voltage of these is 25 kV/cm so we want to have control of the voltage up to this point ~14kV



dlgoff Jonathan has actually finished with the project now unfortunately, otherwise I wouldn't be on here trying to conjure up some ideas.
 
  • #12
Bailiwick said:
dlgoff Jonathan has actually finished with the project now unfortunately, otherwise I wouldn't be on here trying to conjure up some ideas.
I was sort of joking with berkeman since we have a member here with the same "name". :smile:

This schematic for a http://www.repairfaq.org/sam/hvgen32.pdf" uses a couple of 555 timers and a television flyback transformer.
Source: http://www.repairfaq.org/sam/samschem.htm#schahg"
 
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