Fall time in inductor current in boost converter DCM

Discussion in 'General Electronics Chat' started by anhnha, Mar 15, 2016.

  1. anhnha

    Thread Starter Active Member

    Apr 19, 2012
    773
    47
    For the boost converter below operating in DCM mode, is the time during which inductor is deenergized (Tfall of inductor current) affected by how much load current?

    upload_2016-3-15_21-52-17.png
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,010
    3,233
    The fall time is related to the value of L, C, and Iload.
    Is this homework?
     
  3. anhnha

    Thread Starter Active Member

    Apr 19, 2012
    773
    47
    No, I am not at school anymore.
    I don't see how that time depends on Iload. Could you explain?
    Fall time will be proportional to slope of inductor current while de-energizing (Vo - Vi)/L.
    So how come it depends on Iload?[/QUOTE]
     
  4. ResFiber

    New Member

    Mar 9, 2016
    5
    1
    I think the equation (Vo-Vi)/L is an ideal equation. In reality, I think the output voltage is not a constant, it has a ripple. So during the fall time the output voltage (Vo) is actually changing a bit, and the amount it is changing depends on the load current.
     
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