High‐Frequency Magnetic Components

Kazimierczuk, Marian K.

doi:10.1002/9781118717806

Cited by 281 publications

(443 citation statements)

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“…The previous result is equivalent to including the low frequency conduction factor Φ low cond (r 0 /δ) equal to one in (16). The non-distorted electric field associated with an external transversal magnetic field H 0 t (r i ) can be derived from (22) as:…”

Section: Low-and High-frequency Analysismentioning

confidence: 99%

“…The values of Φ low cond (r 0 /δ) and Φ low prox (r 0 /δ) can also be obtained applying the small argument values to the complete functions shown in (16) and (18), respectively, assuming the identity…”

Section: Low-and High-frequency Analysismentioning

confidence: 99%

“…It should be noted that the expression for Φ high cond (r 0 /δ) and Φ high prox (r 0 /δ) can be derived from (16) and (18), respectively, considering the approximation for large argument values of the Bessel functions J n (z) ∼ = 2/(πz) cos(z − 1 2 nz − 1 4 π) [47]. Figures 3(a) and 3(b) show the low-and high-frequency approaches compared with the complete expressions, respectively.…”

Section: Low-and High-frequency Analysismentioning

confidence: 99%

“…This approach has been followed by many authors arriving at expressions based on Bessel functions which are applied to calculate the losses in litz-wires, as may be seen in [10][11][12][13][14][15][16]. It should be noted that the solution can be achieved either by considering physical external field excitations [17,18], or from a Helmholtz potential point of view [19,20].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tm-Te Decomposition of Power Losses in Multi-Stranded Litz-Wires Used in Electronic Devices

Carretero¹,

Acero²,

Alonso³

2012

PIER

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Abstract-Efficiency often constitutes the main goal in the design of a power system because the minimization of power losses in the magnetic components implies better and safer working conditions. The primary source of losses in a magnetic power component is usually associated with the current driven by the wire, which ranges from low to medium frequencies. New power system tendencies involve increasing working frequencies in order to reduce the size of devices, thus reducing costs. However, optimal design procedures involve increasingly complex solutions for improving system performance. For instance, using litz-type multi-stranded wires which have an internal structure to uniformly share the current between electrically equivalent strands, reducing the total power losses in the windings. The power losses in multi-stranded wires are generally classified into conduction losses and proximity losses due to currents induced by a magnetic field external to the strand. Both sources of loss have usually been analyzed independently, assuming certain conditions in order to simplify the derivation of expressions for calculating the correct values. In this paper, a unified analysis is performed given that both power losses are originated by the electromagnetic fields arising from external sources where the wire is immersed applying the decomposition into transversal magnetic (TM) and transversal electric (TE) components. The classical power losses, the so called conduction and proximity losses, can be calculated considering the TM modes under certain conditions. In addition, a new proximity loss contribution emerges from the TE modes under similar conditions.

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Section: Low-and High-frequency Analysismentioning

confidence: 99%

Section: Low-and High-frequency Analysismentioning

confidence: 99%

Section: Low-and High-frequency Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tm-Te Decomposition of Power Losses in Multi-Stranded Litz-Wires Used in Electronic Devices

Carretero¹,

Acero²,

Alonso³

2012

PIER

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“…where W a is the window area of the core, A c is the crosssectional area of the core, K u is window utilization factor, J m is the rms value of the current density in the window, andB is the peak value of the core flux density [13]. The area product gives rough estimate for the core size.…”

Section: Optimizationmentioning

confidence: 99%

Effects of the switching frequency of a grid converter on the LCL filter design

Koppinen¹,

Rahman²,

Hinkkanen³

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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The size of the LCL filter can be decreased significantly using higher switching frequencies enabled by next generation semiconductors. This paper studies the effects of the switching frequency of a grid converter on the LCL filter design. The goal in the design is to minimize the stored energy of the magnetic components. The core material of the converter-side inductor is selected based on the highest peak flux density within core-loss density limits. A laminated iron-core inductor is assumed on the grid side. For achieving higher accuracy during optimization, the grid-side inductor is modelled using an analytical high-frequency model. The proposed design method is evaluated using a 50-Hz 12.5-kVA SiC grid converter as an example case.

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High voltage gain reduced current ripple switched coupled inductor quasi‐Z‐source inverter

Dave

Singh

Bansal

2019

Int Trans Electr Energ Syst

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Summary This article proposes an extended boost switched coupled inductor quasi‐Z‐source inverter (ESCL‐q‐ZSI) topology. The key features of ESCL‐q‐ZSI topology are high voltage gain, ripple‐free continuous source current, and common ground between dc source and inverter circuit, and this makes it propitious for PV applications. Due to the presence of two different switched inductor (SL) structures, ESCL‐q‐ZSI topology offers high voltage gain at low shoot through duty ratio ( Dsh) as compared to reported switched inductor q‐ZSI topologies. Low Dsh ensures high modulation index; hence, better output power quality is achieved. Moreover, both the SL structures used in ESCL‐q‐ZSI topology possess coupled inductors that aid in eliminating ripples in the source current and inductor currents. Thus, the average inductor current, in turn, inductor size required to obtain the same voltage gain gets reduced. This article is initiated with a brief literature review. It summarizes salutary factors in each chronologically developed switched inductor q‐ZSI topology and remarks over limitations of each topology. Magnetic and mathematical considerations to design coupled inductor for SL structures are derived. The superiority of ESCL‐q‐ZSI over conventional topologies is projected through thorough comparative analysis. Effectiveness of the proposed topology is validated through a MATLAB/Simulink platform and a laboratory prototype.

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High‐Frequency Magnetic Components

Cited by 281 publications

References 0 publications

Tm-Te Decomposition of Power Losses in Multi-Stranded Litz-Wires Used in Electronic Devices

Tm-Te Decomposition of Power Losses in Multi-Stranded Litz-Wires Used in Electronic Devices

Effects of the switching frequency of a grid converter on the LCL filter design

High voltage gain reduced current ripple switched coupled inductor quasi‐Z‐source inverter

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