# US 12,002,606 B2 · Ferrite core and coil component comprising same

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- Number: US 12,002,606 B2
- Document ID: US12002606B2
- Status: Granted
- Kind: B2
- Application number: 16/965,109
- Filed: 2019-01-28
- Published: 2021-02-04
- Granted: 2024-06-04
- Earliest claimed: 2018-02-01
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Hyun Ji Lee; Jai Hoon Yeom; Sung Hoon Kim; Seok Bae; Sang Won Lee
- Web page: https://patentgrep.com/patent/US12002606B2

## CPC

- H01F 1/11: in the form of particles {(for magnetic record carriers G11B5/70626)}
- H01F 3/08: made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06)
- H01F 1/344: {Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4}
- H01F 27/24: Magnetic cores
- H01F 27/255: made from particles (H01F27/26 takes precedence)
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 27/2895: {Windings disposed upon ring cores}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A ferrite core according to an embodiment of the present invention includes a plurality of grains including Mn at 30 to 40 mol %, Zn at 5 to 15 mol %, and Fe at 50 to 60 mol %, and a plurality of grain boundaries disposed between the plurality of grains, wherein the plurality of grains and the plurality of grain boundaries include Co, Ni, SiO2, CaO, and Ta2O5, content of the Co and the Ni in the plurality of grains is two or more times higher than content of the Co and the Ni in the plurality of grain boundaries, content of the SiO2, the CaO, and the Ta2O5 in the plurality of grain boundaries is two or more times higher than content of the SiO2, the CaO, and the Ta2O5 in the plurality of grains, a magnetic permeability is 3000 or more, and a core loss is 800 or less.

## Claims

### Claim 1

A ferrite core comprising:
a plurality of grains including Mn at 30 to 40 mol %, Zn at 5 to 15 mol %, and Fe at 50 to 60 mol %; and
a plurality of grain boundaries disposed between the plurality of grains,
wherein the plurality of grains and the plurality of grain boundaries include Co, Ni, SiO2, CaO, and Ta2O5,
content of the Co and the Ni in the plurality of grains is two or more times higher than content of the Co and the Ni in the plurality of grain boundaries,
content of the SiO2, the CaO, and the Ta2O5 in the plurality of grain boundaries is two or more times higher than content of the SiO2, the CaO, and the Ta2O5 in the plurality of grains,
an average separation distance between the plurality of grains is in a range of 1 to 2 μm, and
an average grain diameter of the plurality of grains is in a range of 7 to 12 μm.

### Claim 2 (depends on 1)

The ferrite core of claim 1, wherein:
the plurality of grains and the plurality of grain boundaries further include Nb2O5 and V2O5; and
the Nb2O5 and the V2O5 are distributed in the plurality of grain boundaries to have content which is higher than content of the Nb2O5 and the V2O5 in the plurality of grains.

### Claim 3 (depends on 1)

The ferrite core of claim 1, wherein the SiO2 is included at 1 to 200 ppm.

### Claim 4 (depends on 3)

The ferrite core of claim 3, wherein the SiO2 is included at 50 to 150 ppm.

### Claim 5

A coil component comprising:
an Mn—Zn based ferrite core; and
a coil wound around the Mn—Zn based ferrite core,
wherein the Mn—Zn based ferrite core includes a plurality of grains including Mn at 30 to 40 mol %, Zn at 5 to 15 mol %, and Fe at 50 to 60 mol %, and a plurality of grain boundaries disposed between the plurality of grains,
the plurality of grains and the plurality of grain boundaries include Co, Ni, SiO2, CaO, and Ta2O5,
content of the Co and the Ni in the plurality of grains is two or more times higher than content of the Co and the Ni in the plurality of grain boundaries,
content of the SiO2, the CaO, and the Ta2O5 in the plurality of grain boundaries is two or more times higher than content of the SiO2, the CaO, and the Ta2O5 in the plurality of grains,
an average separation distance between the plurality of grains is in a range of 1 to 2 μm, and
an average grain diameter of the plurality of grains is in a range of 7 to 12 μm.

### Claim 6 (depends on 5)

The coil component of claim 5, wherein:
the Mn—Zn based ferrite core has a toroidal shape.

### Claim 7 (depends on 6)

The coil component of claim 6, wherein:
the coil includes a first coil wound around the Mn—Zn based ferrite core and a second coil wound around the Mn—Zn based ferrite core to be symmetrical to the first coil.

### Claim 8 (depends on 5)

The coil component of claim 5, further comprising a bobbin disposed between the Mn—Zn based ferrite core and the coil.

### Claim 9 (depends on 5)

The coil component of claim 5, wherein:
the plurality of grains and the plurality of grain boundaries further include Nb2O5 and V2O5; and
the Nb2O5 and the V2O5 are distributed in the plurality of grain boundaries to have content which is higher than content of the Nb2O5 and the V2O5 in the plurality of grains.

### Claim 10 (depends on 1)

The ferrite core of claim 1, wherein the Co is included at 1500 to 5500 ppm.

### Claim 11 (depends on 1)

The ferrite core of claim 1, wherein the Ni is included at 300 to 500 ppm.

### Claim 12 (depends on 1)

The ferrite core of claim 1, wherein the CaO is included at 400 to 600 ppm.

### Claim 13 (depends on 1)

The ferrite core of claim 1, wherein the Ta2O5 is included at 400 to 600 ppm.

### Claim 14 (depends on 2)

The ferrite core of claim 2, wherein the Nb2O5 is included at 250 to 400 ppm.

### Claim 15 (depends on 2)

The ferrite core of claim 2, wherein the V2O5 is included at 400 to 600 ppm.