Loss comparison in the design of high frequency inductors and transformers

Lavers, J.D.; Bolborici, Valentin

doi:10.1109/20.800583

Cited by 31 publications

(17 citation statements)

References 5 publications

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“…The solid round winding is designed to withstand the maximum current stress at a uniform dc current density. Assuming a copper conductor, the skin depth as a function of frequency is [2] δ w = ρ w π f s μ r μ 0 (18) where ρ w = 1.724 × 10 −8 ·m at T = 25…”

Section: Winding Designmentioning

confidence: 99%

Analysis and Design of Choke Inductors for Switched-Mode Power Inverters

Saini

Ayachit

Reatti

et al. 2018

IEEE Trans. Ind. Electron.

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Abstract-This paper presents the design, analytical estimation of power losses, and experimental measurement of choke inductors for switched-mode power inverters. The described approach is applicable to a wide variety of circuits such as Class-E inverters and converters. The expressions required to design the magnetic core in the choke inductor using the area-product ( A p ) method are given. The equations for the dc resistance, ac resistance at high frequencies, and dc and ac power losses are provided for the solid round winding wire. To validate the presented approach, an example class-E zero-voltage switching power inverter with practical specifications is considered. A core with air gap is selected to avoid core saturation in the choke inductor, which conducts dc current and a small ac current. The gapped core power loss density and power loss are estimated using Steinmetz empirical equation. It is shown that the winding power loss due to the dc current is dominant for the given design. A comparison between the area-product A p method and the preexisting core geometry coefficient K g method is presented. The measured magnitude of the inductor impedance has shown that the designed choke is useful up to ten times the switching frequency.

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Section: Winding Designmentioning

confidence: 99%

Analysis and Design of Choke Inductors for Switched-Mode Power Inverters

Saini

Ayachit

Reatti

et al. 2018

IEEE Trans. Ind. Electron.

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“…For this purpose, it is necessary to reduce copper loss [1]. Reducing the winding AC resistance is one method of reducing copper loss.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Proximity Effect in Coil Using Magnetoplated Wire

Matsumoto

Enoki²,

Asahina

et al. 2007

IEEE Trans. Magn.

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The upgrading of the efficiency of transformers and increase in the quality factor of inductors are required. For this purpose, it is necessary to reduce copper loss. Reducing the winding AC resistance is one method of reducing copper loss. Therefore, we propose the use of magnetoplated wire (MPW) for coil windings. An MPW is a copper wire (Cu wire) whose circumference is plated with a magnetic thin film. The resistances due to the proximity effect of Cu wire and MPW coils at a frequency of = 1 MHz, which have a diameter of = 4 54 mm, a wire diameter of = 0 09 mm, and a number of turns of = 102, are 4.2 and 2.1 , respectively; thus, the proximity effect decreases by half.Index Terms-AC resistance, copper wire, magnetoplated wire, proximity effect, skin effect.

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“…Copper loss must be reduced to upgrade the efficiency of transformers and to increase the quality factor in coils (Lavers and Bolborici, 1999;Acero et al, 2005;Mizuno, Enoki, Hayashi et al, 2007). For this purpose, it is necessary to reduce the AC resistance that contributes to most of the coil resistance in the high-frequency range over 100 kHz.…”

Section: Introductionmentioning

confidence: 99%

Reduction of eddy current loss in magnetoplated wire

Matsumoto

Enoki²,

Suzuki

et al. 2009

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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PurposeThe purpose of this study is to reduce eddy current loss in a wire that is affected by an alternating field passing through it. This allows us to upgrade the efficiency of transformers and to increase the quality factor in coils. Design/methodology/approachWe propose the use of a magnetoplated wire (MPW) to reduce eddy current loss in a wire. An MPW is a copper wire (COW) whose circumference is plated with a magnetic thin film. In additional, the theoretical equation for eddy current loss in an MPW is derived for ease of analysis. FindingsWe calculate the eddy current loss in an MPW as a function of the relative permeability and resistivity of its magnetic thin film to reduce the resistance due to the proximity effect of a coil. The eddy current loss in an MPW whose magnetic thin film has a relative permeability of 500 and a resistivity of 0.12 µΩm can be reduced to 4 % that of COW at a frequency of 1 MHz. Originality/valueThe use of MPW can be expected to upgrade the efficiency of transformers and to increase the quality factor in coils.

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Loss comparison in the design of high frequency inductors and transformers

Cited by 31 publications

References 5 publications

Analysis and Design of Choke Inductors for Switched-Mode Power Inverters

Analysis and Design of Choke Inductors for Switched-Mode Power Inverters

Reduction of Proximity Effect in Coil Using Magnetoplated Wire

Reduction of eddy current loss in magnetoplated wire

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