Variable inductor

Details Variable inductor Variable inductor

2007-07-10

2007-07-10

Nguyen, Tuyen T. (Department: 2832)

Inductor devices

Coils of special configuration

Figure '8' section

Reexamination Certificate

active

10772140

ABSTRACT:
A variable inductor which avoids electrical breakdown of the insulation in the control windings when used in high power applications includes a core formed of a permeable magnetic material, the core having three legs, including a center leg and two outer legs. A main winding element comprising a main conductor is wound around the center leg of the core. A control winding element comprising a control conductor is wound in a figure-eight configuration having a first winding and a second winding around respective outer legs, the winding configuration canceling induced voltages in the first and second windings, wherein a current through the control winding element causes a change in inductance of the main winding element.

REFERENCES:
patent: 3212039 (1965-10-01), Kober
patent: 3686561 (1972-08-01), Spreadbury
patent: 5737203 (1998-04-01), Barrett
patent: 6317021 (2001-11-01), Jansen
patent: 6736904 (2004-05-01), Poniatowski et al.
patent: 2002/0121285 (2002-09-01), Poniatowski et al.
Medini, D., and Ben-Yaakov, S., “A Current-Controlled Variable-Inductor for High Frequency Resonant Power Circuits”,IEEE,219:225, (1994), no date/month.

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