using PWM as current control

Discussion in 'General Electronics Chat' started by sparkskard, Apr 27, 2015.

  1. sparkskard

    Thread Starter New Member

    Nov 18, 2014
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    I need to control current ,, adjusting the maximum load can use .. thinking use standard PWM circuit but use current feedback instead voltage feedback .. would this work ?? I guess i would have have need some voltage
    feedback alone with the current feedback to make sure voltage would not get too high or too low. any one input this mater ??

    thanks

    sparkskard..
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    The Completed Projects Forum is for Completed Projects only. It is meant to allow members to show plans for projects they built so other members can duplicate them if desired. Your thread does not belong in this forum, and was moved here.
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    From your description I have no lcear idea of what you are attempting to do.

    For the moment, forget how you are doing this, just describe what you need to do.
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
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  5. crutschow

    Expert

    Mar 14, 2008
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    Current control (constant current) switchers are commonly used to efficiently drive LEDs.
    You can add overvoltage protection if you want, but it's normally not needed in a constant current circuit.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    A typical example of how can be done is via a fractional ohm resistor between source and common if using a Mosfet.
    IR also has a line of multi-pin (5 pin) mosfets called HexSense versions, that have a built in monitor of the drain current.
    Max.
     
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