Review of Flux Interaction of Differently Aligned Magnetic Fields in Inductors and Transformers

Pfeiffer, Jonas; Kuster, Pierre; Schulz, Ilka E. M.; Friebe, Jens; Zacharias, Peter

doi:10.1109/access.2020.3047156

Cited by 11 publications

(6 citation statements)

References 114 publications

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“…The main winding is wound around the main core, and these winding terminals represent the inductor's terminals, while the auxiliary or control winding is wound around the auxiliary core. In order to minimize or eliminate the induced emf and harmonics caused by the main winding on the auxiliary winding, orthogonal biasing is employed, in which the two working fluxes that result from the main and auxiliary windings, respectively, must be perpendicular to each other [68]. The orthogonal biasing is achieved by installing the two magnetic cores orthogonally.…”

Section: Current-controlled Configurationsmentioning

confidence: 99%

“…However, the main disadvantage of this biasing scheme is the formation of unintended magnetic coupling between the main and auxiliary windings, which can induce unwanted emf in the auxiliary winding, negatively affecting the control circuit and even reflecting effects on the main winding by increasing harmonics in it. The undesired magnetic coupling effect is generally avoided by wounding both windings in such a way that any induced emf cancels out [64,68].…”

Section: Current-controlled Configurationsmentioning

confidence: 99%

See 1 more Smart Citation

A Review of Tunable Inductors for Power Electronics: Techniques and Applications

Azim

2024

Preprint

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Section: Current-controlled Configurationsmentioning

confidence: 99%

Section: Current-controlled Configurationsmentioning

confidence: 99%

A Review of Tunable Inductors for Power Electronics: Techniques and Applications

Azim

2024

Preprint

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“…It is important to clarify that magnetically controlled transformers, also known as magnetic amplifiers or magnetic regulators, have been present for a long time, mainly as a VAR-compensating elements, as detailed in [8], [19], [29], [30]. Latest improvements in VI analysis, together with the development of new VT structures enables a generalized understanding of this device, clarifying its possible uses in SMPS.…”

Section: B Variable Transformersmentioning

confidence: 99%

Magnetically Controlled Transformer With Variable Turns Ratio and Low Series Inductance: Analysis and Implementation Toward Its Application in SMPS

Buitrago,

Cobaleda,

Martinez

2023

IEEE Trans. Power Electron.

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A comprehensive description of magnetically controlled transformers is presented in this paper to asses their potential in isolated and resonant power converters. These converters benefit from implementing variable magnetics as the soft switching zones and voltage operating ranges are extended, along with fixed or quasi-fixed frequency operation. To represent the variation of the transformer's equivalent turns ratio and parallel-series inductance, the cantilever model is selected. Moreover, two novel transformer structures employing parallel pre-magnetization are introduced; only off-the-shelf magnetic cores are required for their implementation. In conjunction with small signal analytical expressions, an adapted SPICE model is provided and compared to FEA simulations. Additionally, the impact of the stray inductance of the structures is assessed, improving the understanding of this controllable magnetic device's constraints and trade-offs. Experimental results align with the derived models and prove the proposed structures to provide significant variations in transformer equivalent turns ratio, keeping a relatively high parallel-series inductance ratio.

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“…Authors in [12]- [15] explain the different types of biasing, and how they influence the variable magnetic device. Fig.…”

Section: A Proposed Scenario and Physical Ferrite Structurementioning

confidence: 99%

Linear Control Compensator for a Variable-Transformer in Wide-Voltage Power Converters

Cobaleda

Tian

Suarez

et al. 2022

2022 IEEE 31st International Symposium on Industrial Electronics (ISIE)

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This work presents the design and simulation of a controllable magnetic device. The device can help the Dual Active Bridge converter (DAB) to operate in the soft switching region for wide-load applications. The control law is based on the modification of the ferrite-core's permeance for Variable-Transformers (VT). The frecuency-domain's model of the VT control leg is obtained using the Gyrator-Capacitor theory. Finally, this model is found by the premise that the interactions of the transformer's main fluxes are minimum in the control leg, furthermore this paper also proposed a ferrite-core construction that reduces these interactions, therefore the induced voltage in the control winding is also minimized, meaning the parallel interactions of the fluxes are reduced. The results shows that the perturbations are manageable for the control scheme and do not affect the device operation.

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Review of Flux Interaction of Differently Aligned Magnetic Fields in Inductors and Transformers

Cited by 11 publications

References 114 publications

A Review of Tunable Inductors for Power Electronics: Techniques and Applications

A Review of Tunable Inductors for Power Electronics: Techniques and Applications

Magnetically Controlled Transformer With Variable Turns Ratio and Low Series Inductance: Analysis and Implementation Toward Its Application in SMPS

Linear Control Compensator for a Variable-Transformer in Wide-Voltage Power Converters

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