Two related types of parametric transformers

Fam, W.Z.; Bahl, G.

doi:10.1109/tmag.1974.1058372

Cited by 31 publications

(13 citation statements)

References 4 publications

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“…The FEA simulations and the empirical measurements present reasonable accuracy. The prototype present the benefits associated with previous PT topologies: Table 2 present a comparison of the main parameters of the new PM-PT topology, compared to previously known PT topologies [10,11,17]. The improved performance of the new PM-PT relies on the novel mechanism used to produce inductance variations.…”

Section: Discussionmentioning

confidence: 99%

“…• Minimum flux-linkage between primary and secondary windings. Most of the different PTs topologies found in the literature, date back to the 1970s [4][5][6][7][8][9][10][11], and rely on the non-linear properties of ferromagnetic saturation, in order to achieve inductance variations. Due to the core non-linear permeability, the inductance characteristic of common inductors and transformers is typically expressed as a function of current:…”

Section: Pt Topologiesmentioning

confidence: 99%

“…The only references found in the literature, regarding PTs operating at higher frequencies using ferrite cores, relate to their use as computing elements in very early logic systems [18]. Every PT found in the power engineering publications, employs silicon-steel core material [4][5][6][7][8][9][10][11]17], limiting the operation of PTs to relatively low frequency applications.…”

Section: Pt Topologiesmentioning

confidence: 99%

“…A number of PT topologies were developed during the 1970s and 1980s and published in the scientific literature [4][5][6][7][8][9][10][11], demonstrating the previously mentioned advantages. On the other hand, these PT topologies presented important limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Performance comparison of new PM-PT and previous PT topologies and common inductor-based convertersFig. 4bdata from[10] Fig. 4adata from[10] Fig.…”

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confidence: 99%

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Parametric transformer using PM‐inductors with saturation‐gap

Aguilar

Rannestad²,

Munk‐Nielsen

2020

IET power electron.

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Parametric transformers are magnetic components which employ a variable inductance to generate parametric oscillations in a secondary resonant tank. Power conversion with parametric transformer can provide constant output voltage regulation, short-circuit protection, input over-voltage and under-voltage protection, and bidirectional filtering. In spite of these benefits, parametric transformers did only experience small scientific attention during the 1970s. Due to the low energy density and low efficiency of the topologies developed at the time, parametric transformers were discarded in favour of the more common power converters based on the magnetic amplifier. In spite of the great developments in power semiconductors, magnetic amplifier control still remains a competitive option in present-day power electronic applications benefiting from its high robustness. This publication presents a new topology of parametric transformer based on permanent magnet (PM)-inductors, presenting higher efficiency and higher energy density. Finite element method magnetics simulations are used to analyse the variable inductance mechanisms. A physical prototype is developed and tested empirically in an AC/DC power converter. The prototype verifies all the mentioned benefits of parametric power conversion, and presents an efficiency and energy density equivalent to presently employed solutions for voltage regulation, using power semiconductor magnetic amplifiers.

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Section: Discussionmentioning

confidence: 99%

Section: Pt Topologiesmentioning

confidence: 99%

Section: Pt Topologiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Performance comparison of new PM-PT and previous PT topologies and common inductor-based convertersFig. 4bdata from[10] Fig. 4adata from[10] Fig.…”

mentioning

confidence: 99%

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Parametric transformer using PM‐inductors with saturation‐gap

Aguilar

Rannestad²,

Munk‐Nielsen

2020

IET power electron.

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Flux control characteristics of ferrite orthogonal core using magnetic fluid

Oka

Iwata

1987

Electron Comm Jpn Pt II

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Because of its orthogonal flux control system, the ferrite orthogonal core holds promise as a vector sensor. The combination of such a core and a magnetic fluid is of interest for control of flux with a simple system. The results of experimental studies comparing vertical and tilted ferrite orthogonal cores in magnetic fluid indicate that the system can be used as a two‐dimensional inclinosensor.

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Difference of flux control between two‐dimensional orthogonal core and three‐dimensional orthogonal core

Oka

1991

Electron Comm Jpn Pt II

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This paper points out that when the primary and the secondary sides of the ferte orthogonal core, which is one of the three‐dimensional orthogonal cores, are modified, it can be regarded as a two‐dimensional orthogonal core. It is shown also that because of its shape, this type of core has the same flux control as the original ferrite orthogonal core. However, there is a difference in the flux control mechanism in the primary and the secondary sides due to the difference of orthogonal dimensions. Based on the results of investigations, the flux control and ac (alternate current) magnetization characteristics are measured for the ferrite orthogonal core and the two‐dimensional orthogonal core. By comparing their characteristics, the flux control and other performances are demonstrated.

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Two related types of parametric transformers

Cited by 31 publications

References 4 publications

Parametric transformer using PM‐inductors with saturation‐gap

Parametric transformer using PM‐inductors with saturation‐gap

Flux control characteristics of ferrite orthogonal core using magnetic fluid

Difference of flux control between two‐dimensional orthogonal core and three‐dimensional orthogonal core

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