Capacitors in series max ripple

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  • TELVM
    Badcaps Veteran
    • Oct 2012
    • 547
    • Spain
    #1

    Capacitors in series max ripple

    Let's say I put two Nichicon HN, 1500uF, ESR=0.009, Max Ripple=2900, in parallel on the +12V rail of a PSU.

    Combination's capacitance will be 1500 +1500 = 3000uF

    Combination's ESR will be 0.009 / 2 = 0.0045

    What will be the combination's max ripple? Equal, higher or lower than the 2900 of a single cap?
    Last edited by TELVM; 08-12-2015, 06:29 AM.
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31170
      • Albion
      #2
      Re: Capacitors in series max ripple

      ripple will double.

        Comment

        • TELVM
          Badcaps Veteran
          • Oct 2012
          • 547
          • Spain
          #3
          Re: Capacitors in series max ripple

          (Screwed up the title, I meant two caps in PARALLEL).

          So the combined max ripple of two caps in parallel of 2900 max ripple each will be 5800?

            Comment

            • SteveNielsen
              Retired Tech
              • Jun 2012
              • 2327
              • USA
              #4
              Re: Capacitors in series max ripple

              The combined (total) current through both caps in parallel will be double the current through only one of them because the effective resistance of the circuit has been cut in half while the voltage remains the same. I=E/R. If R is cut in half then R will go into E twice as many times, meaning that I doubles.

                Comment

                • TELVM
                  Badcaps Veteran
                  • Oct 2012
                  • 547
                  • Spain
                  #5
                  Re: Capacitors in series max ripple

                  Thanks!

                    Comment

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