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Power supply voltage dip protection design

Discussion in 'Power Electronics' started by i200yrs, Nov 1, 2016.

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  1. i200yrs

    i200yrs

    4
    0
    Nov 1, 2016
    Hello All...good day...I am new with this forum...Just want to ask from experts about the the attached circuit, what would be i consider if i increase the original capacitor from 10000uF to 33000uF? PowerProtectCkt2.JPG Thanks a lot.

    PowerProtectCkt2.JPG PowerProtectCkt2.JPG PowerProtectCkt2.JPG
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,501
    2,841
    Jan 21, 2010
    Probably very little.

    It is possible that the resistor may get a little warmer, if it's not noticeably warm now, there's probably nothing to worry about.

    Is the contactor rated for 33V?

    Why not use a bridge rectifier and a large filter capacitor?
     
  3. i200yrs

    i200yrs

    4
    0
    Nov 1, 2016
    Thanks for the inputs...the caps rated 63V...that is actually the original design to hold for 1 sec power dip...But i want to increase it up to 3 sec power dip protection. So based on cap discharge formula (Vc=Voe(-t/RC). The 33000uF cap is very suitable....thanks
     
  4. pgib8

    pgib8

    107
    23
    Jul 26, 2015
    I second the bridge rectifier. But wait, you didn't say what the problem was.
     
  5. i200yrs

    i200yrs

    4
    0
    Nov 1, 2016
    Hello...most of the power dip happens here at least 3sec....our system original design based on the schematic is can hold only 1 sec for the coil...so our system trips...so i am modifying the system to handle until 3 sec power dip. Thanks guys.
     
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