Author Topic: voltage multiplier  (Read 1521 times)

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Offline PirateguyTopic starter

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voltage multiplier
« on: July 23, 2018, 07:10:45 pm »
how do i chose the caps and diodes for this?
i presume the capacitance doesn't matter much but i am wondering about voltage ratings.

 

Offline David Hess

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Re: voltage multiplier
« Reply #1 on: July 24, 2018, 02:19:50 am »
The series arrangement of the common Cockcroft-Walton voltage multiplier shown means that the diodes and capacitors only need to be rated for greater than the peak-to-peak input voltage.
 

Offline PirateguyTopic starter

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Re: voltage multiplier
« Reply #2 on: July 24, 2018, 03:21:53 am »
ok lol that changes things considerably.

thanks for the help. :)
 

Offline Raj

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Re: voltage multiplier
« Reply #3 on: August 09, 2018, 04:30:31 am »
i'd say, tripple of input voltge for safety.

Even in simple bridge rectifiers,we use overrated diodes and caps
 

Offline PirateguyTopic starter

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Re: voltage multiplier
« Reply #4 on: August 13, 2018, 12:02:26 am »
nevermind, scrapping this idea in favor of a marx generator. :)
 

Offline Wolfgang

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Re: voltage multiplier
« Reply #5 on: August 13, 2018, 09:36:44 pm »
Why dont you simulate one and see how it works and what voltages and currents you can expect ?

Like here:

https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-1kv-50ma-linear-power-supply/

Just to be on the safe side, ...

- At very high voltages, caps and diodes need equalizing resistor chains
- The bottom side caps get the most ripple current. This can be considerable, and if you use electrolytics you need to check for ripple current ratings
- dont forget bleeder resistors so that stored charge does not stay there forever and kills the operator long after the beast has been switched off
- watch isolation distances
- use HV fuses only, check for rating

HV can kill. Have fun but dont be silly !
 

Offline PirateguyTopic starter

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Re: voltage multiplier
« Reply #6 on: August 13, 2018, 11:59:03 pm »
i ordered some 1kv ceramics and looking at this schematic:

i saw another where the first resistor on the left was 10M.

the scope of the project is to incorporate this into a miniature diorama,
and to produce visible sparks. i intend to limit current as much as possible
and in the end it should be no more dangerous then a stun gun module.
(hell, if things get too hot or whatever i might just end up faking it with one of those modules :P)

anyhoo i still have some reading to do on this one, it is one in a long list of miniaturization experiments
i have lined up.

the bleeding resistor, it can be the same watt rating as the rest?
 


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