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Peak an inductor actively?

Discussion in 'Electronic Design' started by Janey, Apr 9, 2008.

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  1. Janey

    Janey Guest

    I want to peak an LC circuit as the load changes. It's < 30 KHz and the
    inductor is approx 20 mH.

    I've seen some patents for electrically-controlled inductors (one winding is
    the control winding) which changes the permeability of the core. But I've not
    found any such designs used or offerings on-line.

    I would appreciate any constructive suggestions how I might go about this.

  2. Adrian C

    Adrian C Guest

    Not an inductor but use a gyrator?
  3. Phil Allison

    Phil Allison Guest


    ** Be a hell of a lot easier to vary the drive frequency to bring the LC
    circuit into resonance.

    Just needs a detector to indicate when the voltage and current are in

    ...... Phil
  4. Janey

    Janey Guest

    ** Be a hell of a lot easier to vary the drive frequency to bring the LC
    If that were the goal, yes. But I want to peak a given frequency.
    How would one go about this detection?

  5. Janey

    Janey Guest

    The basics of designing a saturable reactor is:

    1. wind a 3-winding inductor (or two 2-winding inductors)
    - design for a uH/mH value greater than your greatest need
    2. wire the "business" windings in series
    3. apply a DC voltage to the control winding(s) and adjust such that the sum
    inductance in the main windings reduces and approaches your target.

    The inductance will be maximum with minimum control voltage, and vice versa.

    Is this right?

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