Impact of implementation of auxiliary bias-windings on controllable inductors for power electronic converters

Pfeiffer, Jonas; Kuster, Pierre; Erenler, Yeliz; Qashlan, Ziyad H. S.; Zacharias, Peter

doi:10.23919/epe20ecceeurope43536.2020.9215616

Cited by 5 publications

(1 citation statement)

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“…R ECENT requirements in the power electronics industry have made to re-consider the use of controllable magnetic devices within switched mode power supplies (SMPS) to attain higher power density, flexibility, and efficiency levels. The use of active pre-magnetization has been presented as a promising alternative to reduce the size and weight of magnetic components in power converters [1]. Additionally, this technique has been employed to attain fixed frequency operation and to extend the soft switching region in power converts [2]- [3], among other numerous applications.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%