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Current Transients -- Choke?

Discussion in 'Electronic Design' started by blanko, May 17, 2008.

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  1. blanko

    blanko Guest

    I am modulating power to a pump (power on and off) and when I am doing
    this I am seeing dips in the input voltage to my power regulators
    (Vin) on other parts of my board.

    What is the best approach to guarantee that my Vin won't dip during
    these current transients caused by my pump? I added some larger input
    and output capacitors that helped a little but didn't fix the
    problem. Should I be adding an inductor/choke to help with this? How
    should I be calculating what type of inductor to use?

    Thanks in advance for any info!
  2. Joerg

    Joerg Guest

    Yes, an inductor can help. But not really if the on/off cycles are
    longer than a few hundred msec. And be careful since inductors generate
    nasty spikes upon a load dump.

    You can use this tool to see the effect of various sizes of inductors:

    Just pretend the transformer isn't there. Or throw your circuit onto
    LTSpice. Another trick is to tap the heavy motor current off before the
    regulators to the other parts of the board.
  3. Joerg

    Joerg Guest

    There you guys in Europe have it easier. Schmidt-Walter's site favors
    Siemens cores, or now Epcos. Not that popular out here in the Wild West.
  4. Phil Allison

    Phil Allison Guest


    ** Huh ?? So what ?

    What do you think voltage regulators are for ??

    ** Just ignore them.

    ...... Phil
  5. Phil Allison

    Phil Allison Guest

    "defaulty brain **** "

    ** So it is not the case -



    ...... Phil
  6. Joerg

    Joerg Guest

    The old radios actually had a polarity switch. Most of Europe's cars
    were negative ground but some French models were not.
  7. default

    default Guest

    He doesn't say if the regulators are dropping out with the dips. A
    low forward drop diode and large cap on the critical supply can serve
    to decouple the PS dips. I'm running some servo motors from the same
    unregulated supply as my op amps and used that technique with good
  8. Phil Allison

    Phil Allison Guest

    defaulty brain dead **** "

    ** So it is not the case -


    ...... Phil
  9. FatBytestard

    FatBytestard Guest

    Set your PC's clock correctly, you idiot.
  10. default

    default Guest

    or he just doesn't say

    you pusillanimous bag of feces
  11. Phil Allison

    Phil Allison Guest

    "default" <>

    ** Is this psychotic dude a kiddie fucker or what ??
  12. FatBytestard

    FatBytestard Guest

    **** you, you retard.

    Set your goddamned wristwatch 5 minutes fast, not your PC, you stupid
  13. default

    default Guest

    You have a nice day too. Any relation to Phil?
  14. default

    default Guest

    5 minutes fast is close enough
  15. default

    default Guest

    Sorry Phil, I left out "sack of odiferous canine feces."

    Have you thought about seeing a shrink about your personality issues?

    I tend to think that empathy, compassion and understanding are
    survival traits - humans developed them as an extension of cooperation
    for survival of the group. If you are without those qualities, it
    makes you underdeveloped or perhaps a mutation.

    Do you go through life hating everyone around you? Seems like you

    If you weren't a bully and coward would you be a serial killer?

    If you are a mutation, you might save evolution the trouble . . .
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