Composite inductor and DC-DC converter using the same

The composite inductor design addresses magnetic saturation and coil conductor coupling by using a magnetic material to shield flux, improving inductor performance and enabling efficient DC-DC converters.

JP7882772B2Active Publication Date: 2026-06-30TDK CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TDK CORP
Filing Date
2022-12-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Conventional inductors experience magnetic saturation, leading to a deterioration of inductor characteristics, and there is a need to suppress magnetic saturation while minimizing coupling between coil conductors.

Method used

A composite inductor design with a rectangular parallelepiped shape featuring coil conductors and a magnetic material interposed between them, where the magnetic material protrudes outward from the coil conductors to shield magnetic flux and maintain uniform flux distribution, thereby suppressing magnetic saturation.

Benefits of technology

The design effectively suppresses magnetic saturation and coupling between coil conductors, enhancing inductor performance and enabling a DC-DC converter with improved characteristics.

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Patent Text Reader

Abstract

To provide a composite inductor that is suppressed in magnetic saturation while suppressing a binding between coil conductors, and provide a DC-DC converter using the same.SOLUTION: In an inductor 1, a magnetic flux between a pair of coil conductors 20A and 20B is shielded by a magnetic body 30 interposed between the pair of coil conductors 20A and 20B. In the inductor 1, side surfaces 30e and 30f of the magnetic body 30 are projected outside of a parallel part 21 of each coil conductor 20, so that the magnetic flux generated in the parallel part 21 is shielded by the magnetic body 30. Further, in the inductor 1, an upper surface 30a of the magnetic body 30 is positioned below an upper surface 22a of a coupling part 22 of each coil conductor 20, so that the magnetic body 30 is less likely to be influenced by a magnetic field generated in the coupling part 22 of each coil conductor 20. Thus, a magnetic distribution in the magnetic body 30 is made uniform, and a magnetic saturation can be suppressed.SELECTED DRAWING: Figure 3
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Citation Information

Patent Citations

  • Multi-phase inductor structure

    CN114005650A

  • Coil component and electronic device equipped with it

    JP2005064319A

  • Coil component and electronic device equipped with it

    JP2005064321A

  • Composite inductor, electric and electronic apparatus, and manufacturing method of composite inductor

    JP2021019141A

  • Inductor component and dc / dc converter using them

    JP2022026401A