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Two capacitors in parallel - High or Low ESR?

Discussion in 'General Electronics Discussion' started by Ping, Feb 3, 2016.

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  1. Ping

    Ping

    4
    0
    Feb 3, 2016
    Hi,
    I want to put two capacitors in parallel in a DC circuit. I need the charging and discharging times to be as brief as possible. Should I get capacitors with high ESR or low ESR?

    Thanks.
     
  2. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    How do you know of ESR? You should be able to answer this yourself :)
     
  3. Ping

    Ping

    4
    0
    Feb 3, 2016
    I'm teaching myself. Patchy background in physics.
    I'm thinking high ESR, but I want to be sure before spending money.
    Someone teach me!
     
    Last edited: Feb 3, 2016
  4. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    You actually want capacitors with high ripple current capability. This really means looking at the size and selecting the biggest capacitor for the capacity and voltage-rating that you choose. Ripple means how hot they will get when in use.
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    10,025
    2,138
    Nov 17, 2011
    ESR = Equivalent Series Resistance. The ESR plus the capacitance form a low pass filter with time constant t=R*C.
    See for yourself how the resistance (ESR) influences charging time.
    Probably the factor limiting the charge current and thus charge time is not the ESR but the max. currrent you can draw from the charging circuit.
     
    Gryd3 likes this.
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,389
    2,774
    Jan 21, 2010
    For rapid charge and discharge ESL actually becomes important. Capacitors designed for use in xenon flash applications are an example of a capacitor designed to be discharged rapidly.
     
    Gryd3 likes this.
  7. supertech007

    supertech007

    5
    1
    Feb 28, 2014
    Low esr
     
  8. supertech007

    supertech007

    5
    1
    Feb 28, 2014
    the lower the esr the faster the dc dischage time
     
    Ping likes this.
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