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Peak an inductor actively?

J

Janey

Jan 1, 1970
0
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
 
A

Adrian C

Jan 1, 1970
0
Janey said:
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

Not an inductor but use a gyrator?
<http://en.wikipedia.org/wiki/Gyrator>
 
P

Phil Allison

Jan 1, 1970
0
"Janey"
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.


** 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
 
J

Janey

Jan 1, 1970
0
** Be a hell of a lot easier to vary the drive frequency to bring the LC
circuit into resonance.

If that were the goal, yes. But I want to peak a given frequency.
Just needs a detector to indicate when the voltage and current are in
phase.

How would one go about this detection?

J.
 
J

Janey

Jan 1, 1970
0
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
 
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