High voltage Ac generation to apply to a capacitor

[Bailiwick]

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

 

[Averagesupernova]

Whats wrong with a stepup transformer?

 

[Bailiwick]

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

 

[sophiecentaur]

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.

 

[berkeman]

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?

 

[Bailiwick]

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 already 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.

 

[berkeman]

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

Interesting. Does the quick-made wine taste different?

 

[Bailiwick]

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

 

[berkeman]

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...?

 

[dlgoff]

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.

 

[Bailiwick]

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.

 

[dlgoff]

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".

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"