Low noise planar transformer

Details Low noise planar transformer Low noise planar transformer

2007-11-06

2007-11-06

Mai, Anh (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

C336S223000, C336S232000, C029S602100

Reexamination Certificate

active

10837398

ABSTRACT:
An apparatus and method for reducing common mode noise capacitive coupling from a primary winding to a secondary winding in a transformer. In an embodiment, the primary winding has two terminals and a plurality of coil turns therebetween formed by a plurality of PCB layers sandwiched together, each having at least one of the coil turns formed thereon. The coils turns are connected in a predetermined way to form the primary winding. One terminal of the primary winding is connected to a coil turn on a first one of the PCB layers, and the other terminal is connected to a coil turn on a second one of the PCB layers. The PCB layers are stacked to form the primary winding. The secondary winding or windings are positioned adjacent to a selected one of the stacked PCB layers that is in a position between the first and second PCB layers.

REFERENCES:
patent: 5184103 (1993-02-01), Gadreau et al.
patent: 5990776 (1999-11-01), Jitaru
patent: 6211767 (2001-04-01), Jitaru
patent: 6628531 (2003-09-01), Dadafshar
patent: 6707690 (2004-03-01), Bottrill
patent: 2004/0032313 (2004-02-01), Ferencz et al.

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