Planar stacked layer inductors and transformers

Details Planar stacked layer inductors and transformers Planar stacked layer inductors and transformers

1999-06-07

2000-09-05

Gellner, Michael L.

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

336223, 361782, 361784, H01F 500

Patent

active

06114939&

ABSTRACT:
The magnetic circuit element structure of this invention comprises a minimum four layer stacked layer sandwich construction in which layers of printed wiring board are alternately interleaved with layers of magnetic core material. Pins or wires form a part of the structure and are provided to electrically connect printed wiring board layers to form winding turns. Specifically, the pins or wires connect the copper foil patterns on layer 1 to the copper foil patterns on layer 3. Legs made of a magnetic core material also form a part of the structure and are provided to magnetically connect the core layers 2 and 4 in order to provide a closed path for magnetic flux. In the minimal structure a first layer consisting of a printed wiring board contains half turns of copper foil in one or more printed wiring board layers. The second layer is formed of ferrite or some other ferromagnetic core material. The third layer is formed of a second printed wiring board which contains half turns of copper foil in one or more printed wiring board layers. The fourth layer is formed of ferrite or other ferromagnetic material. The magnetic circuit element structure created provides a low profile planar construction with high power density, low AC conduction losses, low volume, and low assembly costs.

REFERENCES:
patent: 5010314 (1991-04-01), Estrov
patent: 5469334 (1995-11-01), Balakrishnan
patent: 5926083 (1999-07-01), Asaoka
patent: 5949191 (1999-09-01), Cassese et al.

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