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pulse generator

Discussion in 'High Voltage' started by nafri, Sep 26, 2012.

  1. nafri

    nafri New Member

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    hi ,
    since i don't know correct place of the topic that i have opened, i m sorry if i did it wrong.

    where can i get pulse generator between 50.000 and 60.000 volt and what would be price ?

    i m from Turkey
     
    Last edited: Sep 26, 2012
  2. cowboybob

    cowboybob Well-Known Member Most Helpful Member

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    nafri, Welcome.

    Seems like a good place, to me, to ask the question.

    It would help us if you could explain further about the pulse you wish to generate and how the pulse is to be used.

    For instance, is it a simple square wave pulse? Will you need to vary the pulse width? How about its frequency and amplitude?

    Is this something you wish to purchase or build yourself?
     
  3. 3v0

    3v0 Coop Build Coordinator Forum Supporter

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    Sounds like an automotive ignition.
     
  4. dave

    Dave New Member

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  5. Ian Rogers

    Ian Rogers Super Moderator Most Helpful Member

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    Most auto coils can generate 6 - 15kv Maybe he COULD use one and bump it up via a transformer..
     
  6. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Racing ignitions can get into the 50,000 to 80,000 (claimed) voltage range.

    John
     
  7. 3v0

    3v0 Coop Build Coordinator Forum Supporter

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    I think we need nafr to tell us what he is trying to do and why.
     
  8. nafri

    nafri New Member

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    pulse width: 1us-10us and square wave pulse and i want to build myself to my school project. but i can change the values anytime. for instance volt can change any values from 30kv to 50kv at anytime
     
  9. cowboybob

    cowboybob Well-Known Member Most Helpful Member

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    Original post:
    Sorry, I read 50.000 to 60.000 as 50 to 60 (didn't know why you had added zeros after the decimal...:rolleyes:).

    In this case, for 50kv to 60kv output, it does sound like your best bet is to get an automotive ignition (HEI - High Energy Ignition) coil (spark) assembly (used, of course - new ones are pricey) and trigger it with a simple bistable 555 squarewave timer (configured to be frequency, pulse width and amplitude adjustable) feeding a transistor (or other device) to control and modulate the HEI output.

    Is this what you mean?
     
    Last edited: Sep 28, 2012
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  10. nafri

    nafri New Member

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    Thanks for your help, i need advise like this. I want to use this generator for PEF( pasteureziton by pulsed electricfild) for my project
     
  11. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    I thought 60kV is too high for pasteureziton by pulsed electricfild.

    Look at a TV horizontal section. It produces a 500 to 1000 volt half sign wave pulse that is multiplied up by a transformer to 25KV to 40kv. In a TV fly-back transformer there are diodes that you do not want. You will not be able to easy change the on-time. It is set by LC resonant frequency. 1uS is too short. 2uS maybe. 3uS to 10uS is easy. I can make a 100 to 800 volt half sign wave pulse pulse for 4uS. When that works, then we can work on the transformer. You are in Turkey so finding the parts to make the transformer may be hard.

    Do you have a CRT monitor that we can takes parts from? (VGA or faster)
     
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  12. nafri

    nafri New Member

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    Thanks, I don't have a CRT monitor but I can find it. Can I change the sign wave to square wave by comparator? And I don't know how to use TV horizontal section. i can find fly-back transformer in CRT monitor but you said that you do not use this part so, where can i find this transformer or can i design it by creating square wave at simulation.
     
  13. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    Using a CRT monitor to generate 50kv pulse will make a half sign wave no choice.
    A comparator will only work at low voltage. 10 volts not 50000 volts.

    What current do you need? very important question what power?
     
  14. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Last edited: Sep 30, 2012
  15. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    30A 8000V
    This is not a 'do it at home' project. I only have 110 and 220 power. I think this will need 440 three phase power.
     
  16. dr pepper

    dr pepper Well-Known Member

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    I get that approx 50kw, thats not a school project, something around 75amps at 440 3ph.

    Looking at the link however that machine processes up to 2000litres an hour, I thnik the op probably wants to zap something the size of a can of pop.

    Maybe soemthing like a zvs flyback driver circuit would work, powered from a largeish electrolytic and a thryristor, or a circuit that generates constant dc hv and on time varied by smoothing capacitance values in conjunction with a spark gap.

    Be carefull rectifying and smoothing a flyback output, the fairly dangerous output becomes very dangerous when its used to charge up a capacitor.
     
    Last edited: Oct 25, 2012

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