Coupled inductors for low electromagnetic interference
AssigneeMaxim Integrated Products, Inc.
InventorsAlexandr Ikriannikov, Di Yao
Life of this patent
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Abstract
A coupled inductor for low electromagnetic interference includes a plurality of windings and a composite magnetic core including a coupling magnetic structure formed of a first magnetic material and a leakage magnetic structure formed of a second magnetic material having a distributed gap. The coupling magnetic structure magnetically couples together the plurality of windings, and the leakage magnetic structure provides leakage magnetic flux paths for the plurality of windings.
Claims18
A coupled inductor for low electromagnetic interference, comprising:
- a plurality of windings;
- and
- a composite magnetic core including a coupling magnetic structure formed of a first magnetic material at least partially embedded in a leakage magnetic structure formed of a second magnetic material having a distributed gap, the first magnetic material having greater magnetic permeability than the second magnetic material, and the coupling magnetic structure magnetically coupling together the plurality of windings and having (a) first and second rails separated from each other in a first direction and (b) coupling teeth connecting between the first and second rails along a second direction, the first and second rails extending beyond the coupling teeth in the second direction and being longer than the coupling teeth in a third direction orthogonal to the first and second direction, the plurality of windings at least partially wrapping the coupling teeth, the leakage magnetic structure encapsulating the coupling teeth between the first and second rails and wherein the coupling teeth forming small gaps in series with the magnetic structure to control magnetizing inductance of the coupled inductor.
A coupled inductor for low electromagnetic interference, comprising:
- a plurality of windings;
- and
- a composite magnetic core including a coupling magnetic structure formed of a first magnetic material at least partially embedded in a leakage magnetic structure formed of a second magnetic material having a distributed gap, the coupling magnetic structure magnetically coupling together the plurality of windings and having (a) first and second rails separated from each other in a first direction and (b) coupling teeth connecting between the first and second rails along a second direction, the coupling teeth forming small gaps in series with the magnetic structure to control magnetizing inductance of the coupled inductor, and the first and second rails extending beyond the coupling teeth in the second direction and being longer than the coupling teeth in a third direction orthogonal to the first and second direction, the plurality of windings at least partially wrapping the coupling teeth, the leakage magnetic structure encapsulating the coupling teeth between the first and second rails.
A coupled inductor for low electromagnetic interference, comprising:
- a plurality of windings;
- and
- a composite magnetic core including a coupling magnetic structure formed of a first magnetic material at least partially embedded in a leakage magnetic structure formed of a second magnetic material having a distributed gap, the composite magnetic core being free of exposed air gaps, and the coupling magnetic structure magnetically coupling together the plurality of windings and having (a) first and second rails separated from each other in a first direction and (b) coupling teeth connecting between the first and second rails along a second direction, the first and second rails extending beyond the coupling teeth in the second direction and being longer than the coupling teeth in a third direction orthogonal to the first and second direction, the plurality of windings at least partially wrapping the coupling teeth, the leakage magnetic structure encapsulating the coupling teeth between the first and second rails.
Dependencies are inferred from the claim text.