Inductor Current

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  • iamakda
    Member
    • Mar 2012
    • 46
    • Denmark

    #1

    Inductor Current

    I have an isolated dc dc boost converter whose average current is 100 A.

    1). How can I find Peak to Peak current of indcutor that is DELTA I (pk-to-pk)?
    2). How can I find Peak current of inductor?

    Any suggestions?

    Thanks.
  • iamakda
    Member
    • Mar 2012
    • 46
    • Denmark

    #2
    Re: Inductor Current

    Same question with more clearification:

    I have an isolated dc dc boost converter whose inductor's average current is 100 A.

    1). How can I find Peak to Peak current of indcutor that is DELTA I (pk-to-pk)?
    2). How can I find Peak current of inductor?

    Any suggestions?

    Thanks.

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Inductor Current

      With a Hall probe.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • iamakda
        Member
        • Mar 2012
        • 46
        • Denmark

        #4
        Re: Inductor Current

        Originally posted by tom66
        With a Hall probe.
        Actually I want to calculate it.....not to measure it....

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Inductor Current

          Originally posted by iamakda
          Actually I want to calculate it.....not to measure it....
          How have you created and isolated -boost- converter? Am I misunderstanding, but isn't a boost converter a nonisolated topology?

          To calculate peak-to-peak current:

          You need the operating frequency of your converter and the inductance.

          Voltage induced across inductor = Inductance * (change in current / change in time)

          If you know the operating frequency (change in time), the voltage across the inductor (input-output difference) and the inductance it is a simple matter of rearranging the equation:

          Voltage induced across inductor / (Inductance * Change in time) = Change in current

          This assumes continuous conduction mode... discontinuous mode is different.

          Peak current of inductor will be average current of inductor plus half the peak-to-peak amplitude. (approx)

          Please note I have only a rudimentary knowledge of SMPSs, so what I just said might be wrong.
          Last edited by tom66; 03-19-2012, 03:45 AM.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • popeye
            Senior Member
            • May 2011
            • 155

            #6
            Re: Inductor Current

            Hi iammakda

            attached pdf of basic formulas.
            Attached Files

            Comment

            • iamakda
              Member
              • Mar 2012
              • 46
              • Denmark

              #7
              Re: Inductor Current

              Originally posted by popeye
              Hi iammakda

              attached pdf of basic formulas.
              Many thanks.

              Comment

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