Switching power supply with composite power inductor

The composite power inductor integrates multiple inductor functions into a single component, addressing the bulkiness and component count of traditional switching power supply devices by canceling magnetic flux and forming a low-pass filter, resulting in a compact, efficient, and high-performance solution.

JP7882338B2Active Publication Date: 2026-06-30MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Patents
Current Assignee / Owner
MURATA MFG CO LTD
Filing Date
2023-10-04
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing switching power supply devices require multiple inductors, leading to a large number of components and a physically bulky form factor, which complicates the integration of filter circuits for output ripple noise suppression.

Method used

A composite power inductor is designed with three inductor conductors and a magnetic body, where the first and second inductors are parallel within the magnetic body to cancel magnetic flux, and the third inductor is orthogonal to them, forming a low-pass filter, integrating multiple inductor functions into a single component.

Benefits of technology

The composite power inductor achieves miniaturization, weight reduction, and high efficiency by suppressing magnetic saturation and reducing output voltage ripple, while maintaining desired performance characteristics.

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Patent Text Reader

Abstract

Provided is a switching power source device (80) equipped with a composite power inductor (10), the switching power source device comprising: a linear inductor conductor (31); a linear inductor conductor (32); an inductor conductor (33); and one magnetic body (20) that forms a magnetic path of a magnetic flux generated by a current flowing to the inductor conductor (31), the inductor conductor (32), and the inductor conductor (33). One end of the inductor conductor (31) is connected to a first input terminal, and the other end is connected to one end of the inductor conductor (33). One end of the inductor conductor (32) is connected to a second input terminal, and the other end is connected to one end of the inductor conductor (33). The inductor conductor (31), the inductor conductor (32), and the inductor conductor (33) are sandwiched by or contained in the magnetic body (20). The inductor conductor (31) and the inductor conductor (32) are arranged in parallel so that the magnetic fluxes generated by the current flowing to each conductor are cancelled out at an inner leg section (10ZI) of the magnetic body (20) between the inductor conductor (31) and the inductor conductor (32), and the magnetic fluxes generated by the current flowing to each conductor are intensified at outer leg sections (10ZO1, 10ZO2) of the magnetic body (20) on the outside of the inductor conductor (31) and the inductor conductor (32). The inductor conductor (33) is arranged so that a plane created by the magnetic flux generated by the current flowing to the inductor conductor (33) is orthogonal to the planes created by the magnetic fluxes generated by the current flowing to the inductor conductor (31) and the inductor conductor (32). The inductor conductor (31) and the inductor conductor (32) are inductors that constitute a power conversion circuit, and the inductor conductor (33) is an inductor that constitutes a low-pass filter with respect to an output current of the power conversion circuit.
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