# US 12,119,161 B2 · High-density single-turn inductor

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- Number: US 12,119,161 B2
- Document ID: US12119161B2
- Status: Granted
- Kind: B2
- Application number: 16/865,730
- Filed: 2020-05-04
- Published: 2021-11-04
- Granted: 2024-10-15
- Earliest claimed: 2020-05-04
- Assignees: Virginia Tech Intellectual Properties, Inc.
- Applicants: Virginia Tech Intellectual Properties, Inc.
- Inventors: He Song; Jun Wang; Yue Xu; Rolando Burgos; Dushan Boroyevich
- Web page: https://patentgrep.com/patent/US12119161B2

## CPC

- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12)
- H01F 17/04: with magnetic core
- H01F 27/085: {Cooling by ambient air}
- H01F 27/2885: {with shields or electrodes (shields or electrodes for pancake coils H01F27/2871; construction of electric or magnetic shields or screens H01F27/36)}
- H01F 27/324: {Insulation between coil and core, between different winding sections, around the coil; Other insulation structures}
- H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An inductor having a coaxial structure is described. In one example, the structure of the single-turn inductor can include a conductor, an insulation layer, a shielding layer, and a magnetic core. An air duct can be located between the shielding layer and the magnetic core. The shielding layer and the magnetic core can both be connected to a ground. In one example, the single-turn inductor can include a single-layer termination structure formed on terminations of the shielding layer. In another example, the single-turn inductor can include a double-layer termination structure formed on terminations of the shielding layer. Displacement current in the single-turn inductor can be reduced using, for example, lumped equivalent circuit models, a semi-conductive shielding layer model, or a resistive layer and conductive shielding layer model.

## Claims

### Claim 1

A single-turn inductor, comprising:
a conductor comprising a copper bar, a Litz wire, or a copper braid;
a solid insulator enclosing at least a portion of the conductor;
a shielding layer enclosing at least a portion of the solid insulator, the shielding layer comprising at least one termination, the shielding layer coupled to ground via a grounding path; and
a magnetic core enclosing at least a portion of the shielding layer, where the grounding path does not pass between the shielding layer and the magnetic core.

### Claim 2 (depends on 1)

The single-turn inductor of claim 1, wherein the shielding layer comprises a silver-coated copper conductive coating.

### Claim 3 (depends on 1)

The single-turn inductor of claim 1, wherein the solid insulator comprises a resin-rich mica tape.

### Claim 4 (depends on 1)

The single-turn inductor of claim 1, wherein a thickness of the solid insulator is based at least in part on an electric field distribution in the solid insulator.

### Claim 5 (depends on 1)

The single-turn inductor of claim 1, further comprising an air duct between the shielding layer and the magnetic core.

### Claim 6 (depends on 1)

The single-turn inductor of claim 1, wherein the shielding layer and the magnetic core have a same ground potential.

### Claim 7 (depends on 1)

The single-turn inductor of claim 1, wherein the grounding path comprises a damping resistance.