Transformer with dual flux path

Details Transformer with dual flux path Transformer with dual flux path

1995-09-15

1998-06-02

Gellner, Michael L.

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

H01F 500

Patent

active

057606714

ABSTRACT:
A transformer comprises a ferrite core and a printed circuit board for primary and/or secondary windings. The ferrite core comprises first and second trunk portions parallel with each other and first and second leg portions parallel with each other. The trunks and first and second leg portions are positioned into a rectangular configuration. The core also comprises a third leg portion parallel to the first and second leg portions and interposed midway between the trunk portions. A cross-sectional area of the first and second leg portions is approximately the same as each other, approximately one half the cross-sectional area of the third leg portion, less than the cross-sectional area of the first trunk portion and less than the cross-sectional area of the second trunk portion. The core is mounted to the printed circuit board such that the first, second and third legs extend through openings in the printed circuit board and the windings surround the third leg portion inside of the first and second leg portions. The core further comprises first and second step portions extending from the first and second trunk portions adjacent and interior to the first and second leg portions, respectively. The first and second step portions have a shorter length than the first and second leg portions and abut against one surface of the printed circuit board, whereby the first trunk portion is offset from one surface of the printed circuit board.

REFERENCES:
patent: 5463365 (1995-10-01), Iwatani et al.
patent: 5600293 (1997-02-01), Hunter
patent: 5606488 (1997-02-01), Gustafson

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