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Peak an inductor actively?

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.

Janey

Reply to
Janey
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Not an inductor but use a gyrator?

Reply to
Adrian C

go read some ancient books on magnetic amplifiers; Geyger & Storm are both very good.

this stuff is old. so old that it hasnt been mentioned in universities for decades (except for using mag-amp post-regulators on smps), so I wouldnt owrry about any patents.

Cheers Terry

Reply to
Terry Given

Reply to
John Fields

Reply to
John Fields

"Janey"

** 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 phase.

..... Phil

Reply to
Phil Allison

If that were the goal, yes. But I want to peak a given frequency.

How would one go about this detection?

J.

Reply to
Janey

Reply to
John Fields

Reply to
John Fields

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?

Janey

Reply to
Janey

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