Design and Analysis of Planar Symmetric Six-Phase Coupled Inductors

Abstract

International audienceThis paper presents a new symmetric design of multi-phase coupled inductors where all phase inductors share one ferrite core. Designed multi-phase inductors were fabricated using the printed circuit board (PCB) technology. One-layer and two-layer designs have been analyzed and compared. Designed planar ferrite cores were fabricated in custom shape with the ferrite materials, C2025 and CN20, commercially available from Ceramic Magnetics, Inc. The core that is mounted on the PCB with printed inductors represents a compact planar component with six inductors mutually coupled with their adjacent inductors. These multi-phase coupled inductors are intended to be used in multi-phase dc/dc converters for switching frequencies near and >1 MHz. Electrical properties of the components were analyzed by a finite-element modeling software and an impedance analyzer HP4194A in the frequency range from 50 kHz to 40 MHz. Distribution of the magnetic flux density in the component has also been performed. One-layer structure component was tested for basic operation with a six-phase dc/dc buck converter in the open-loop steady-state 6 × 1 operation mod

Integrated magnetics optimization process for an interleaved three‐phase buck converter at 500 kHz

“…Using Equation ( 18), the equation for parameter, y, ensures that magnetic flux passing through the connecting bridge arm is equal to that passing through the lateral column and the centre core. Therefore, the volume of the lateral column (V o ) and the volume of the centre core (V c ) can be expressed as in Equations (19) and (20), respectively.…”

“…In addition, relevant studies have proposed mathematical models for two-phase [16][17][18], three-phase [12,19], and multiphase [20,21] interleaved coupled inductors and have also discussed coupling coefficients. If the current ripple is reduced so that the effective value of the inductor current is, in turn, reduced to further decrease copper loss, the winding should employ reverse coupling [12][13][14][15][16][17][18][19][20][21]. This design can also offset part of the dc flux and reduce the inductor current ripple.…”

Design and Assessment of Track Structures in High-Frequency Planar Inductors

“…They are widely used in a variety of applications, ranging from heaters [7], to custom filters in power electronic converters [8], to wireless implantable medical devices [9]. To optimize planar inductors, it is imperative that inductance is achieved in accordance with the requirements of the application while simultaneously minimizing copper and core losses [10]. Designing a planar inductor involves selecting the core dimensions, number of turns, and inductance value, as well as conducting a comprehensive parameter sweep to determine the generalized design limits.…”

Design and Assessment of Track Structures in High-Frequency Planar Inductors

“…They are widely used in a variety of applications, ranging from heaters [7], to custom filters in power electronic converters [8]. To optimize planar inductors, it is imperative that the inductance is achieved in accordance with the application's requirements while simultaneously minimizing copper and core losses [9]. A key objective of this paper is to investigate the effects of different structures on the parameters of the inductor.…”