Half Size Reduction of DC Output Filter Inductors With the Saturation-Gap Magnetic Bias Topology

Aguilar, Andres Revilla; Munk‐Nielsen, Stig

doi:10.1109/jestpe.2016.2535186

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…In both cases, these PMI topologies present a fix nominal inductance, dominated by the reluctance of the air‐gap, and would have limited value as PTs. A more recently develop PMI topology, referred as the saturation‐gap [19–21], uses two non‐gapped (UU shape) cores, biased by the same pair of PMs. The saturation‐gap topology, is depicted in Fig.…”

Section: Proof Of Concept Of New Pm‐pt Topologymentioning

confidence: 99%

“…It can achieve full linear biasing, (bias is 100% of linear range of the BH curve) and over‐biased states (biasing flux reaches saturation, beyond the linear range of the BH curve). Over‐biased PMIs with the saturation‐gap topology, has been documented to provide up to 50% total inductor size reduction [21].…”

Section: Proof Of Concept Of New Pm‐pt Topologymentioning

confidence: 99%

“…The effect of different current levels at the primary side, induce variations in the total biasing level achieved at the secondary side. Except at low currents when the biasing level changes, from what is been referred as over‐biasing to under‐biasing [21], the nominal inductance is maintained almost constant. On the other hand, the positive saturation current limit,

I_{sat}

and the total area of the

L_{2} ()(, I_{2})

is been shifted towards the fist quadrant, proportionally to the DC current level at the primary.…”

Section: Proof Of Concept Of New Pm‐pt Topologymentioning

confidence: 99%

“…The PM material must present equivalent resistivity. Bonded‐NdFeB present the required resistivity and is been used for PMI applications on this frequency range [21]. A commonly used method for determine the required inductor core size and power handling, is based on the area product,

A_{normalp}

A_{normalP} = A_{normalC} A_{normalW}

where

A_{normalC}

is the area cross‐section of the magnetic core, and

A_{normalW}

is the window area available for the windings.…”

Section: Design and Simulation Of A Pm‐pt Prototypementioning

confidence: 99%

“…The dominant reluctance of the core is almost constant until saturation of the full core is reached, providing a linear nominal inductance until the saturation current limit,

I_{sat}

. The nominal reluctance value of each of the SG segments,

{scriptR}_{SG}

is approximately equal to the reluctance of one of the PMs,

{scriptR}_{PM}

[19–21]

{scriptR}_{SG} ≅ {scriptR}_{PM} = \frac{l_{PM}}{μ_{0} μ_{PM} A_{PM}}

where

l_{PM}

is the PM's length through its magnetisation axis,

μ_{0}

is the permeability of vacuum,

μ_{PM}

is the relative permeability of the PM, and

A_{PM}

is its area cross‐section. The nominal inductance,

L_{0}

and the parallel capacitance, C must satisfy resonant condition in (7).…”

Section: Design and Simulation Of A Pm‐pt Prototypementioning

confidence: 99%

See 4 more Smart Citations

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: Proof Of Concept Of New Pm‐pt Topologymentioning

confidence: 99%

Section: Proof Of Concept Of New Pm‐pt Topologymentioning

confidence: 99%

I_{sat}

and the total area of the

L_{2} ()(, I_{2})

is been shifted towards the fist quadrant, proportionally to the DC current level at the primary.…”

Section: Proof Of Concept Of New Pm‐pt Topologymentioning

confidence: 99%

A_{normalp}

A_{normalP} = A_{normalC} A_{normalW}

where

A_{normalC}

is the area cross‐section of the magnetic core, and

A_{normalW}

is the window area available for the windings.…”

Section: Design and Simulation Of A Pm‐pt Prototypementioning

confidence: 99%

“…The dominant reluctance of the core is almost constant until saturation of the full core is reached, providing a linear nominal inductance until the saturation current limit,

I_{sat}

. The nominal reluctance value of each of the SG segments,

{scriptR}_{SG}

is approximately equal to the reluctance of one of the PMs,

{scriptR}_{PM}

[19–21]

{scriptR}_{SG} ≅ {scriptR}_{PM} = \frac{l_{PM}}{μ_{0} μ_{PM} A_{PM}}

where

l_{PM}

is the PM's length through its magnetisation axis,

μ_{0}

is the permeability of vacuum,

μ_{PM}

is the relative permeability of the PM, and

A_{PM}

is its area cross‐section. The nominal inductance,

L_{0}

and the parallel capacitance, C must satisfy resonant condition in (7).…”

Section: Design and Simulation Of A Pm‐pt Prototypementioning

confidence: 99%

See 3 more Smart Citations

Parametric transformer using PM‐inductors with saturation‐gap

Aguilar

Rannestad²,

Munk‐Nielsen

2020

IET power electron.

Self Cite

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Modified MMC and its capacitor voltage ripple suppression method employed in medium‐voltage wind generator system

Guan

Huang

2019

IET Power Electronics

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Modular multilevel converter (MMC) is widely used in medium-and high-voltage applications, but there are large capacitor voltage ripples on the sub-modules (SMs) when applied to low-speed applications, such as wind generator system. The method based on the injection of common-mode voltage and high-frequency current is the most effective solution at present, but it will bring new problems. To solve these problems, a modified MMC is proposed in this study. Firstly, coupled inductors and LC resonance circuit are adopted as the power transfer channel between the upper arm and lower arm of the MMC, to eliminate the low-frequency voltage ripple. The theoretical analysis and design guideline of the coupled inductors and LC resonance circuit are discussed in detail before the explanation of SM voltage fluctuation suppression method. Secondly, an improved voltage fluctuation suppression method, named limited compensation method, is presented to replace the conventional full compensation method to decrease the magnitude of injected high-frequency current, thereby reducing the current ratings of power devices, size of inductors, and the cost of system. In the end, MATLAB/SIMULINK simulations and a 2 kW down-scaled prototype are performed to validate the effectiveness of the proposed solution and its control scheme.

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