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Registered Member #4252
Joined: Fri Dec 09 2011, 10:43AM
Location:
Posts: 18
Good afternoon guys.
I am developing a circuit for an ionizer. I didn't know that it could be done just by a Cockroft Walton Multiplier circuit. I tried the circuit attached here (with 15 stages) but the relationship between the output and the input is far from linear (only 'til th 5th stage) - see the other attached file (IONIZER.jpg). By the way, the signal in each point is always a sinewave - i thought the diodes would rectify the waveform. Am i measuring it in the wrong way?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
keep one leed (the black one on the nuetral) then take the red lead to each point you want to measure.
that sinewave your seeing is needed for the doubling or whatever, if you measure from N to 16, youll see pulsing dc, or DC given your high protection resistance.
and just to remind peeps, there are many voltage multiplier arrangements possible. Some are meant to be better for one purpose and not another, it depends what your after.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Looks exactly like a 15-stage multiplier kit that I bought.... Mine never worked well, 10nF is too small for 50 or 60 Hz I intend to replace the 1N4007s with UF4007s and run it at kHz someday ...when I get around to it.
Registered Member #4497
Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62
Sulaiman wrote ...
Looks exactly like a 15-stage multiplier kit that I bought.... Mine never worked well, 10nF is too small for 50 or 60 Hz I intend to replace the 1N4007s with UF4007s and run it at kHz someday ...when I get around to it.
1N4007s have capacitance measured on frequency 1MHZ, so i think they can handle a few kHz
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I guess the larger the capacitance the better....
One 'ideal' solution is top stage capacitors = C next stage down = 2.C next stage down = 3.C etc. uses a lot of capacitors though!
For example, in our case we have 30 capacitors, that could be re-arranged as 2x1 for the top stage 2x2 for the next 2x3 for the next 2x4 for the next 2x5 for the bottom stage.
This would perform better but with only 5 stages the output would be less than 2 kV
Since you have larger values try combining them with the existing 10nFs as per the above scheme, higher capacitance in the early/lower stages.
Registered Member #4252
Joined: Fri Dec 09 2011, 10:43AM
Location:
Posts: 18
@Sulaiman: It is something like this right (attached file)? Then i can use 1x33nF to do the job of 3x10nF. Thank you for your help. I'll try this!! How do you know that with 5 of this combined stages the voltage will be less than 2kV? @Patrick: how do i increase the frequency?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
you need a transistor type driver, that produces a waveform of one kind or another, usually square. but stick with AC from the wall socket for now. It takes time and skill to build a driver. if you need low current the wall socket (properly limited) is fine.
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Ionizer circuit
