Simplified transformer design for a switching power supply

Details Simplified transformer design for a switching power supply Simplified transformer design for a switching power supply

2005-07-05

2005-07-05

Donovan, Lincoln (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

C336S223000, C336S232000, C029S602100

Reexamination Certificate

active

06914508

ABSTRACT:
A transformer has a primary winding made from a first conducting trace formed on a first multilayer printed circuit board, and a secondary winding made from a second conducting trace formed on a second multilayer printed circuit board. The primary winding is magnetically coupled to the secondary winding. The windings are etched as traces in copper layers of the PC boards as spirals. The spiral of one copper layer is connected to the spiral of a different copper layer by a via, or vias, formed through the insulating layer of the PC board. The vias are drilled, cleaned, and plated with conducting material, for example copper. By using multiple layers, and by connecting spiral windings of each layer to the windings of the next layer by use of vias, any number of turns can be built into a primary winding, or into a secondary winding.

REFERENCES:
patent: 4873757 (1989-10-01), Williams
patent: 6420953 (2002-07-01), Dadafshar
patent: 6466454 (2002-10-01), Jitaru

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