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Pulse transformer

Discussion in 'General Electronics Discussion' started by Sravanthi, Jul 9, 2015.

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  1. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
    HI...

    How we can calculate the minimum coil current required to the pulse transformer from the datasheet specifications.

    In datasheet thy have given ignition current value. Does this value is the minimum current for the coil.
    Thank you...
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,397
    2,777
    Jan 21, 2010
    perhaps you can post a link to the dataset so we're ask talking about the same thing.
     
  3. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
  4. davenn

    davenn Moderator

    13,596
    1,875
    Sep 5, 2009
    no, it says UP TO = up to a max of xxxx Amps varies with the model
     
  5. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
    Then what is the minimum amount required?
     
  6. davenn

    davenn Moderator

    13,596
    1,875
    Sep 5, 2009
    The ignition current is the output current
    they have models that have output currents ranging from 0.1A to 3A

    it says nothing of the input current ... well not that I can see
     
  7. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
    Hi,,,
    I am using IT237 model
    http://schaffner.com/en/products/da...transformer-with-single-secondary-winding.pdf

    For this I am driving the pulses from 555 timer of datasheet(http://www.ti.com/lit/ds/symlink/ne555.pdf).

    I designed astable multivibrator with ON duration of 0.05ms and 0.150ms OFF duration with 5V.
    But when I am trying to drive this pulse to pulse transformer this pulse at input side and output side its having ON duration of 0.05ms and OFF duration as 0.7ms.
    Can i know the reason for this.
    I am having doubt that whether 555 timer can drive the pulse transformer current.
    Or is there any reason for this.

    For your reference here I am attaching the images.
    First image is multivibrator output before feeding to the Pulse transformer. Second image is pulse transfomer input(multivibrator output) and pulse transformer output.

    Please help me in this issue.
     

    Attached Files:

  8. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
    Hi,,,
    I am using Pulse transformer IT237 model
    http://schaffner.com/en/products/da...transformer-with-single-secondary-winding.pdf

    For this I am driving the pulses from 555 timer of datasheet(http://www.ti.com/lit/ds/symlink/ne555.pdf).

    I designed astable multivibrator with ON duration of 0.05ms and 0.150ms OFF duration with 5V.
    But when I am trying to drive this pulse to pulse transformer this pulse at input side and output side its having ON duration of 0.05ms and OFF duration as 0.7ms.
    Can i know the reason for this.
    I am having doubt that whether 555 timer can drive the pulse transformer current.
    Or is there any reason for this.

    For your reference here I am attaching the images.
    First image is multivibrator output before feeding to the Pulse transformer. Second image is pulse transfomer input(multivibrator output) and pulse transformer output.

    Please help me in this issue.
     

    Attached Files:

  9. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    It looks like the transformer is upsetting the frequency (waveform) produced by the 555. Try separating the two with a buffer transistor and separate power supplies.
    The transformer DC resistance is far too low for the 555.
     
    Last edited: Jul 16, 2015
  10. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
    Is there any other way than driving through transistor.
    Is there any 555 timer which drives higher currents.
     
  11. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    It's a shit of a chip.
    The worst chip ever designed.
     
    Arouse1973 likes this.
  12. Sravanthi

    Sravanthi

    72
    1
    Feb 4, 2015
    Is there any other pulse transformer for these requirement???
     
  13. Martaine2005

    Martaine2005

    2,827
    754
    May 12, 2015
    I couldn't disagree with you more!
    This versatile little 8 pin chip has opened the electronics door for many a tinkerer like me and others.
    But that's just my opinion.

    Martin
     
    Supercap2F likes this.
  14. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    "I couldn't disagree with you more!"

    Let me just inform you of the truth of the matter.
    Just because there has been 30 billion chips sold and thousands of circuits, don't mean it is not the worst chip ever designed.
    For a start, the mere fact that there has been a number of attempts to improve the features by bringing out different versions, is proof of its short-comings.
    For a start, the chip takes about 10mA when sitting around doing nothing.
    Secondly, the chip cannot be turned off.
    Thirdly, the chip does not drive rail-to-rail and
    Fourthly, it goes hay-wire when driving a low impedance load and the "engineer" does not know why.
    I realise it is old technology, but to use 28 transistors to perform such a simple task, needs to be looked at.
    I am absolutely amazed that no other company copied or brought out an improvement.
    It goes to show that no other company really had any competent engineers to analyse the situation.
    In fact all our chips are very poorly designed and were the product of a handful of engineers.
    All the original 7400 and CD4000 chips were very poorly designed with a double row of pins.
    This should have been a single row to make PCBs smaller and designing much easier.
    And to have 4 of the same gate on each chip is a stupid idea.
    Fortunately the microprocessor and microcontroller came out and made all these chips redundant.
    But you look back and see how nothing was changed for 30 years.
     
    Arouse1973 likes this.
  15. Martaine2005

    Martaine2005

    2,827
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    May 12, 2015
    That implies that it is indeed a very popular chip.

    I don't see any short comings! I see a successful chip that has sold billions.
    Every item bought from yester year to today have different versions. It's called 'updating' and 'improving'.
    The cmos version if proof of that.

    I could go on and on, but it's futile if you walk around blind folded.
    Times change, ideas change and technology too.
    You just proved that..You said "fortunately the μcontroller came", well, for us tinkerers who have no interest in programming, the 555 and 4017 are just a couple of very popular chips for the hobbyist.

    I also think that with your level of experience, you could design a better chip because you know all their faults.
    Should be really easy for you. I will watch this space.

    Martin
     
    Supercap2F likes this.
  16. AnalogKid

    AnalogKid

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    Jun 10, 2015
    I've been reading your posts for a while now, often wondering the same thing. Your command of semiconductor history is very interesting. How old are you?

    ak
     
  17. Arouse1973

    Arouse1973 Adam

    5,164
    1,081
    Dec 18, 2013
    At last I have found a use for the 555 timer :D

    555 timer.png
     
    Martaine2005 likes this.
  18. Martaine2005

    Martaine2005

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    May 12, 2015
    I knew you wouldn't be able to stop yourself chipping in. They sell them a lot smaller now.:p
     
    Arouse1973 likes this.
  19. AnalogKid

    AnalogKid

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    Jun 10, 2015
    Colin. I was responding to his post. I should have trimmed more.

    ak
     
  20. Martaine2005

    Martaine2005

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    May 12, 2015
    Colin is a good engineer, but doesn't like the 555:D
    He has/had a website for beginners like me called Talking Electronics.

    Very informative and great little circuits.

    Martin
     
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