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Design a flyback transformer for charging defibrillator

  1. Mar 15, 2017 #1
    how can i design a flyback transformer for the controlled charging of defibrillator capacitor(high voltage). The charging is controlled using PWM which controls the transformer switching using a MOSFET.
     

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  2. jcsd
  3. Mar 15, 2017 #2

    berkeman

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    Welcome to the PF.

    It looks like the paper you attached has a pretty good explanation for your question. Have you read it? Is there some part that you do not understand? Is this for schoolwork?
     
  4. Mar 15, 2017 #3

    sophiecentaur

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    Sorry to be a pain here but is this project aimed ant actually building something? If it is, then you need to be under the direction of someone who is competent to handle very high voltages. By their very nature, Defib Capacitors store enough energy to kill you. I'm not sure what the Mods would think about this??? eh, berkeman?
     
  5. Mar 15, 2017 #4

    berkeman

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    :smile:
     
  6. Mar 15, 2017 #5

    dlgoff

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    Yep. And it's mentioned on page 4.
     
  7. Mar 15, 2017 #6

    jim hardy

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    That paper stops short of designing the actual transformer.

    The Devil is always in the Details. You've got to pick a core and figure out how much wire to wind onto it.

    TI has a guide here
    https://www.ti.com/lit/ml/slup127/slup127.pdf

    core manufacturers have design guides but they tend to be cryptic because the folks who write them are so experienced they have difficulty making their shorthand easy for beginners to grasp.
    Magnetics Inc is an old line supplier with an extensive library.
    take a look here
    https://www.mag-inc.com/Design/Selection-Guide
    https://www.mag-inc.com/Design/Design-Guides/Transformer-Design-with-Magnetics-Ferrite-Cores
    https://www.mag-inc.com/getattachme...oductDistributionChartWaAc2012.pdf?lang=en-US

    hope that gets you started.

    Coilcraft has design tools that help you pick one of their standard transformers.
    http://www.coilcraft.com/transformsel.cfm
    http://www.coilcraft.com/prod_cap_charger.cfm

    old jim
     
    Last edited: Mar 15, 2017
  8. Mar 16, 2017 #7

    sophiecentaur

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    Safety / danger would probably also be mentioned in paper on using TNT but PF would still urge caution and probably distance itself from too much discussion. I think it's in the rules.
     
  9. Mar 19, 2017 #8

    berkeman

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    The OP has not been back in almost a week, so I'll go ahead and close the thread for now. @swathy -- send me a Private Message if you would like this thread re-opened for discussion.
     
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