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Registered Member #1373
Joined: Tue Mar 04 2008, 12:45PM
Location:
Posts: 20
hi everyone..i'm newbie, i want to know if there someone that could help me in designing and building a 15kV cockcroft - walton high voltage multiplier... i got some problem in choosing the suitable diode... anyone got suggestion in what type of diode that i should use??
Registered Member #1373
Joined: Tue Mar 04 2008, 12:45PM
Location:
Posts: 20
i have calculated the stage and completed the design.. but i need some opinion in choosing the right diode n capacitor...some idea said that 1N4007 are suitable... so if someone have done this kind of project, can you give some advice..
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
1N4007 diodes can stand 30A peak current so let's suppose it is enough. How many stages are you planning and what is your supply voltage? One 1N4007 stands 1kV, for higher supply voltages you must wire some of them in series. For capacitors, you can make your own or buy some commercial caps. Each cap must stand the supply voltage.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
You can use 1N4007 diodes (2 per stage) and 10 nF 1 kV ceramic capacitors 15 kV will require many stages (at least 15,000/2x1.414x240 = 23 stages minimum) the available output current will be less than one milliamp, but it will work.
Add at least 10 kOhm of resistors in series with the high voltage output or you will destroy the diodes!
I have a 15-stage C-W multiplier with (30x) 1N4007 and (30x) 10nF 1kV disk ceramic capacitors - it works.
Registered Member #1373
Joined: Tue Mar 04 2008, 12:45PM
Location:
Posts: 20
thanks sulaiman..there something i want to ask... what is the main evaluation in choosing the right component?? what kind of simulation program that you used to simulate this kind of project??
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
First I must give credit to the copyright owners, the circuit diagram is copied from the instructions of an ionizer kit that I got on offer many years ago
The main considerations are;
1) Voltage ratings All diodes and capacitors need a voltage rating of at least 2 x SQRT(2) x Vac which for 240 Vac means 1000 volt rated devices.
2) Capacitance values The frequency and capacitance values determine how much the output voltage will drop when current is drawn. A good starting reference is:
3) Number of stages Each stage will give approximately 2 x SQRT(2) x Vac Volts dc with no load (one stage is two diodes and two capacitors) design for about 1.5x the on-load voltage
There are other considerations and other C-W type multiplier configurations, Google for more info.
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I need some help.. (with voltage multiplier)
