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Building a Current sensing circuit using DC-DC converter

Discussion in 'Electronic Basics' started by pyose, Dec 11, 2005.

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  1. pyose

    pyose Guest

    Building a Current sensing circuit using DC-D
    converte

    Good Afternoon guys

    As mentioned at the subject, i really have to build the circuit for m
    class project..the problem is i dont know where to start and wha
    components should i buy..maybe someone has the practical circuit
    could refer to or is there any reference from the internet i shoul
    take a look? i really have to start building it right now..than

    Pyose
    Malaysi
     
  2. Jan Wagner

    Jan Wagner Guest

    You mean current sensing /for/ a DC-DC converter? There are many
    ways, for example if you want to measure the switching current then
    a simple toroidal ferrite core with a single winding (lots of turns)
    would do. Feed the current carrying wire through the center of the
    toroid, place a small resistor accross the toroid winding, and there
    you go, output voltage is proportional to the current in the wire
    that goes through the toroid.

    Example coils
    http://www.coilws.com/Current Sensse.htm
    http://en.wikipedia.org/wiki/Transformer#Current_transformers

    If you want to sense DC current, a hall effect sensor could do. If
    it doesn't have to be galvanically isolated current sensing, then
    you could also use a series resistor ("real resistor" or just a thin
    ning slab of copper, circuit board trace, etc) which is placed e.g.
    on the ground lead. Then measure the voltage drop accross the
    resistance, typically is some millivolts (U=R*I...)

    If you want to see how to use the current sensing in a DC-DC
    converter, check the application notes for various PWM controllers,
    they usually have example circuits that show current sensing, too.

    For example
    http://www.onsemi.com/pub/Collateral/AN983-D.PDF

    TL494, LM3524, UC3864, ...

    - Jan
     
  3. JeffM

    JeffM Guest

    Building a Current sensing circuit using DC-DC
    Have your instructor give a class in How to Write a Specification.
     
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