# US 10,319,509 B2 · Embedded magnetic component device

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- Number: US 10,319,509 B2
- Document ID: US10319509B2
- Status: Granted
- Kind: B2
- Application number: 16/196,236
- Filed: 2018-11-20
- Published: 2019-03-21
- Granted: 2019-06-11
- Earliest claimed: 2014-08-14
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Quinn Robert Kneller; Scott Andrew Parish; Justin Morgan
- Web page: https://patentgrep.com/patent/US10319509B2

## CPC

- H01F 27/2804: {Printed windings}
- H01F 27/2895: {Windings disposed upon ring cores}
- H01F 41/046: {structurally combined with ferromagnetic material}
- H01F 27/2809: {on stacked layers}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An embedded magnetic component device includes a magnetic core located in a cavity in an insulating substrate. An electrical winding includes inner and outer conductive connectors. An inner solid bonded joint boundary is located between first and second portions of the insulating substrate and extends between the cavity and the inner conductive connectors. An outer solid bonded joint boundary is located between the first and the second portions of the insulating substrate extends between the cavity and the outer conductive connectors. The minimum distance of the inner solid bonded joint boundary between any of the inner conductive connectors and the inner interior wall of the cavity is defined as D1, and the minimum distance of the outer solid bonded joint boundary between any of the outer conductive connectors and the outer interior wall of the cavity is defined as D2. D1 and D2 are about 0.4 mm or more.

## Claims

### Claim 1

A method of manufacturing an embedded magnetic component device, comprising:
a) forming an insulating substrate from a resin material with a first side and a second side opposite one another, and with a cavity therein with inner and outer cavity interior walls, and with a magnetic core located in the cavity with an air gap between the magnetic core and the cavity; and
b) forming an electrical winding disposed around the magnetic core, the electrical winding includes:
inner conductive connectors disposed in the insulating substrate, extending through the first side and the second side, and near the inner periphery of the magnetic core;
outer conductive connectors disposed in the insulating substrate, extending through the first side and the second side, and near the outer periphery of the magnetic core;
upper conductive traces disposed on the first side of the insulating substrate; and
lower conductive traces disposed on the second side of the insulating substrate; wherein
the inner conductive connectors respectively provide electrical connections between the upper conductive traces and the lower conductive traces; and
the outer conductive connectors respectively provide electrical connections between the upper conductive traces and the lower conductive traces; wherein step a) includes:
forming the insulating substrate includes an inner solid bonded joint boundary between first and second portions of the insulating substrate that together define the cavity, the solid bonded joint boundary extending between the cavity and the inner conductive connectors; and
forming the insulating substrate includes an outer solid bonded joint boundary between the first and the second portions of the insulating substrate that together define the cavity, the outer solid bonded joint boundary extending between the cavity and the outer conductive connectors;
the minimum distance of the inner solid bonded joint boundary between any of the inner conductive connectors and the inner interior wall of the cavity is defined as D1;
the minimum distance of the outer solid bonded joint boundary between any of the outer conductive connectors and the outer interior wall of the cavity is defined as D2; and
D1 and D2 are respectively in a range of about 0.4 mm to about 1 mm.

### Claim 2 (depends on 1)

The method of claim 1, wherein D1 and D2 are respectively in a range of about 0.4 mm to about 0.8 mm.

### Claim 3 (depends on 1)

The method of claim 1, wherein D1 and D2 are respectively in a range of about 0.4 mm to about 0.6 mm.

### Claim 4 (depends on 1)

The method of claim 1, wherein:
the magnetic core includes a first section and a second section; and
the electrical winding includes a primary electrical winding disposed around the first section and a secondary electrical winding disposed around the second section;
the primary electrical winding and the secondary electrical winding are isolated; and
the primary electrical winding and the secondary electrical winding respectively comprise the upper conductive traces, the lower conductive traces, the inner conductive connectors, and the outer conductive connectors.

### Claim 5 (depends on 1)

The method of claim 1, wherein forming the insulating substrate includes:
forming a base substrate with the cavity with the inner and outer cavity interior walls; and
forming a cover layer on the base substrate; and
the inner solid bonded joint boundary and the outer solid bonded joint boundary exist between the base substrate and the cover layer.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
forming a first isolation barrier formed on the first side of the insulating substrate, covering at least the closest portion between the primary winding and the secondary winding, and forming a solid bonded joint with the primary winding and the secondary winding; and
forming a second isolation barrier formed on the second side of the insulating substrate, covering at least the closest portion between the primary winding and the secondary winding, and forming a solid bonded joint with the primary winding and the secondary winding.

### Claim 7 (depends on 6)

The method of claim 6, wherein the first isolation barrier and/or the second isolation barrier include a single layer.

### Claim 8 (depends on 6)

The method of claim 6, wherein the first isolation barrier and/or the second isolation barrier include a plurality of layers.

### Claim 9 (depends on 6)

The method of claim 6, wherein electronic components are mounted on the first isolation barrier and/or the second isolation barrier.

### Claim 10 (depends on 1)

The method of claim 1, wherein the insulating substrate includes a thermoplastic, a ceramic material, or an epoxy material.

### Claim 11 (depends on 1)

The method of claim 1, wherein electronic components are mounted on the first side and/or the second side of the insulating substrate.