Transformer with controlled interwinding coupling and controlled

Details Transformer with controlled interwinding coupling and controlled Transformer with controlled interwinding coupling and controlled

1996-07-12

1998-02-17

Gellner, Michael L.

Inductor devices

With electric and/or magnetic shielding means

336 84M, 336 84R, 336184, H01F 2736, H01F 2728

Patent

active

057195447

ABSTRACT:
A transformer in which a magnetic medium provides flux paths within the medium, two or more windings enclose the flux paths at separated locations along the paths, and an electrically conductive medium, arranged in the vicinity of the magnetic medium and the windings, defines a boundary within which flux emanation from the magnetic medium and the windings is confined and suppressed. In a transformer constructed in accordance with the present invention, both controlled values of leakage inductance and the benefits of separated windings can be achieved. The conductive medium can be configured to reduce the leakage inductance of a controlled-leakage inductance transformer (e.g. for use in a zero-current switching power converter), having separately located windings, by at least 25%, and can be configured to reduce the leakage inductance of a low-leakage inductance transformer (e.g. for use in a PWM power converter), having separately located windings, by at least 75%.

REFERENCES:
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Holtje and Hall, "A High-Precision Impedance Comparator", General Radio Experimenter, vol., 30, No. 11, Apr. 1956, pp. 1-12.
Maurice et al., "Very-Wide Band Radio-Frequency Transformers", Wireless Engineer, Jun. 1947, pp. 168-177.

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