Low-volume buck converter with adaptive inductor core biasing

Ahsanuzzaman, S. M.; McRae, Timothy; Peretz, Mor Mordechai; Prodić, Aleksandar

doi:10.1109/apec.2012.6165840

Cited by 27 publications

(7 citation statements)

References 17 publications

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“…In other works [92][93][94][95] a second winding is wound around the inductor coil, and a current is applied to move the operating point on the ϕ À i characteristic to a different point, farther from the saturation region. An auxiliary control circuit is added to the conventional current controller, that determines the biasing current for the second winding.…”

Section: Smps Controlmentioning

confidence: 99%

Nonlinear models of power inductors: A survey

Oliveri

Lodi

Storace

2021

Circuit Theory & Apps

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Summary Switch‐mode power supplies (SMPSs) are widely exploited to interface electrical energy sources to motors and other electrical loads. Inductors are usually the biggest and heaviest components in SMPSs, limiting their overall power density. Therefore, there is an increasing interest in designing SMPSs with partially saturating inductors, because this significantly reduces their weight and size, thus increasing power density. This paper provides a review of nonlinear behavioral models (based on easy‐to‐measure quantities) of the inductance, power loss, and temperature rise of inductors working, at least partially, in magnetic saturation. This survey discusses the pros, cons, and ranges of validity of these models, with a glimpse at their application to SMPS simulation, design, monitoring, and control.

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Section: Smps Controlmentioning

confidence: 99%

Nonlinear models of power inductors: A survey

Oliveri

Lodi

Storace

2021

Circuit Theory & Apps

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“…For a given transfer function GðsÞ (it can be (8) when the inner loop is considered or (9) when the outer loop is considered) and a controller CðsÞ, the closed-loop transfer function T ðsÞ is expressed as in (10):…”

Section: Control Design Using Affine Parameterisationmentioning

confidence: 99%

Performance enhancement of powertrain DC–DC converter using variable inductor

Beraki

Trovão

Perdigão

2021

IET Electrical Syst in Trans

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Performance enhancement of a powertrain DC-DC converter is provided using a current-controlled magnetic device, the variable inductor (VI). The VI is composed of two groups of windings, main and auxiliary. The auxiliary winding is used to regulate the permeability of the magnetic core over a wide range of load variations. To regulate the saturation level of the magnetic core and avoid postsaturation operation of the power inductor, an appropriate level of auxiliary winding current is needed. To this end, a simple and dynamic strategy is proposed to estimate the auxiliary winding currents of the VI. The proposed approach is validated using simulation studies of a large-scale VI-based powertrain DC-DC converter. The results reveal the significance of the proposed approach in continuous regulation of the magnetic property of the power inductor core, enhancing powertrain DC-DC converter performance by up to 13.70% and reducing stress on switching devices by 17.87%. Furthermore, energy source current variation is reduced by 6.73%, leading to reduced stress on energy storage systems.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Typically, the number of turns in the bias winding should be > in order to ensure a small control current and maximize its effect in terms of flux cancellation [5]. It would also be preferable if there were no influence of the main flux on the bias winding, as regards the reflected voltage.…”

Section: E Variable Inductor Designmentioning

confidence: 99%

“…Other aspects are related to the transient performance of the converter [5]. A recurrent topic is the magnetics performance and optimization and one of the main challenges is how to improve the components choice and sizing [6], [7].…”

mentioning

confidence: 99%

“…A VI is a multiple winding, DC current-controlled device, usually built with a ferrite core [14]- [19]. As response to the control current the effective global reluctance of the core can be changed, since the amount of DC flux in the core is varied, and therefore differential inductance of the inductor can be controlled [5]. Experimental results will demonstrate that a core size reduction of more than 50% can be achieved with the proposed ripple reduction technique.…”

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confidence: 99%

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Large-Signal Characterization of Power Inductors in EV Bidirectional DC–DC Converters Focused on Core Size Optimization

Perdigão

Trovão

Alonso

et al. 2015

IEEE Trans. Ind. Electron.

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This paper is focused on core size optimization of power inductors in Bidirectional DC-DC converters. It presents an experimental large-signal characterization procedure for power inductors in EV applications and a method to obtain an inductance reference value for the power inductor in DC-DC converters simulation studies. It discusses the importance of the inductor design project by describing important constraints, such as core size and saturation. The main contribution of this paper is related to the proposed DC flux cancellation technique in the bidirectional converter. A variable inductor (VI) prototype is used to replace the power inductor in order to decrease core size, by improving the ripple content of the inductor current. The saturation level of the core is controlled by means of an auxiliary winding whether the converter operates in buck or boost mode. Experimental results validate the proposed methodology showing a more than 50% reduction in magnetic material for similar current levels.

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Low-volume buck converter with adaptive inductor core biasing

Cited by 27 publications

References 17 publications

Nonlinear models of power inductors: A survey

Nonlinear models of power inductors: A survey

Performance enhancement of powertrain DC–DC converter using variable inductor

Large-Signal Characterization of Power Inductors in EV Bidirectional DC–DC Converters Focused on Core Size Optimization

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