A Novel Integrated Magnetic Core Structure Suitable for Transformer-Linked Interleaved Boost Chopper Circuit

Imaoka, Jun; Kimura, Shota; Martínez, Wilmar; Yamamoto, Masaaki

doi:10.1541/ieejjia.3.395

Cited by 26 publications

(34 citation statements)

References 26 publications

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“…The inductor ripple current and the flux density are designed at 1.5 A and 250 mT. To obtain these designed parameters, a design method that satisfies both the inductor current ripple and the flux density is applied (1) . The design value and the measured value using the SCW and a conventional inductor are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the leakage inductance which is proportional to the DC fluxes has to be increased when the inductor current ripple of the circuit specifications is satisfied. To solve this problem, EIE core structure, designed to suppress fringing flux, has already been proposed in (1) . However, this core structure needs three parts of magnetic cores to configure the EIE structure.…”

Section: Introductionmentioning

confidence: 99%

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Coupling Coefficient Improvement and Electromagnetic Induced Noise Reduction using Short-Circuited Winding for Loosely Coupled Inductor

2016

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A loosely coupled inductor for interleaved power converters has attracted interest for downsizing magnetic components. Although the loosely coupled inductor is usually designed by adjusting the coupling coefficient in order to meet the design specifications, the coupling coefficient is saturated by the fringing fluxes in the central leg and the external leakage fluxes in the case of the EE or EI magnetic core structures. It is a matter of concern that these fluxes are causes of electromagnetic induced noise and reduction in the downsizing performance. To solve this problem, this paper proposes a short-circuited winding for the coupled inductor in order to reduce the external leakage flux in the windings. The effectiveness of the coupled inductor with a short-circuit ring is evaluated with experimental tests.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupling Coefficient Improvement and Electromagnetic Induced Noise Reduction using Short-Circuited Winding for Loosely Coupled Inductor

2016

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“…Recently, magnetic core structure and winding arrangement for the loosely-coupled inductors have been discussed. For example, split-winding structure to reduce parasitic capacitance between windings, and EIE magnetic core structure for getting high coupling coefficient (14) (19) . There is also other instances which the loosely-coupled inductors is applied to PFC converters as well as DC-DC converters (20) .…”

Section: Calculation Of the Allowable Power For The Iwci Convertermentioning

confidence: 99%

Allowable Power Analysis and Comparison of High Power Density DC-DC Converters with Integrated Magnetic Components

et al. 2017

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Interleaved dc-dc converters with integrated magnetic components are popular as converters capable to achieve high efficiency with less of volume and mass. There are three methods for integrated magnetic components: loosely-coupled inductors, closed-coupled inductors and integrated-winding-coupled inductors. This paper presents a method to calculate the allowable power in various circuit topologies. It is useful for measuring the allowable power without magnetic saturation of an inductor based on its size. Following the analysis of allowable power for each coupled inductor, the allowable power of the integrated magnetic components is compared to that of the conventional interleaved converter. This comparison is realized under the same conditions. As a result, the interleaved converter with loosely-coupled and integrated winding coupled inductors were found to be effective for the downsizing of the magnetic components under continuous conduction mode operation. On the other hand, the interleaved converter with close-coupled inductors is effective for the downsizing of the magnetic components under critical conduction mode operation. This comparative data is discussed from both theoretical and experimental points of view.

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“…CCTT core split-winding structure is effective for reducing the parasitic capacitance between the windings or the external leakage flux of the windings (14) . E-E or E-I core structure with laminated or bifilar windings (15) (16) and E-I-E core structure (17) for obtaining high coupling coefficients are proposed as well.…”

Section: Magnetic Structurementioning

confidence: 99%

“…Moreover, integrated magnetic components are applied to reduce the volume and the weight of magnetic components and to improve the performance of the interleaved converter (2) (12)- (17) . In addition, integrated magnetic components have been applied owing some attractive features.…”

Section: Introductionmentioning

confidence: 99%

Feasible Evaluations of Coupled Multilayered Chip Inductor for POL Converters

Imaoka¹,

Kimura²,

Itoh³

et al. 2015

IEEJ Journal IA

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Point of load (POL) converters require a small size and high-efficiency performance for IT industrial applications. In addition, the interleaved technique, magnetic integration, and application of GaN FETs are well known as good approaches to satisfy these demands in the power converters. Although coupled inductors for POL converters have been proposed in several studies, a coupled multilayered chip inductor has not been examined because of the difficulty of its construction. In this paper, a novel coupled multilayered chip inductor for interleaved POL converters is proposed. This novel coupled inductor has a pair of windings with inverse coupling in the magnetic core. Further, the magnetic material of the coupled inductor is an Fe-based metal composite powder (Fe-Si-Cr). Additionally, an Fe-based powder in the magnetic core has been processed with electrical insulation by a highly crystallized oxide nanolayer in order to reduce the eddy-current losses. Finally, the high efficiency performance of the coupled multilayered chip inductor is evaluated by prototypes of interleaved buck converters using normally off-type GaN FETs with a switching frequency of 1 MHz.

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A Novel Integrated Magnetic Core Structure Suitable for Transformer-Linked Interleaved Boost Chopper Circuit

Cited by 26 publications

References 26 publications

Coupling Coefficient Improvement and Electromagnetic Induced Noise Reduction using Short-Circuited Winding for Loosely Coupled Inductor

Coupling Coefficient Improvement and Electromagnetic Induced Noise Reduction using Short-Circuited Winding for Loosely Coupled Inductor

Allowable Power Analysis and Comparison of High Power Density DC-DC Converters with Integrated Magnetic Components

Feasible Evaluations of Coupled Multilayered Chip Inductor for POL Converters

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