Planar stacked layer inductors and transformers
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United States of America Patent
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Sep 5, 2000
Grant Date -
N/A
app pub date -
Jun 7, 1999
filing date -
Jun 7, 1999
priority date (Note) -
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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.
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