Improved Expression for Estimation of Leakage Inductance in <i>E</i> Core Transformer Using Energy Method

Thondapu, S. R.; Borage, Mangesh; Wanmode, Yashwant D.; Shrivastava, Purushottam

doi:10.1155/2012/635715

Cited by 9 publications

(3 citation statements)

References 14 publications

(20 reference statements)

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“…The FEM in conjunction with the Energy Method was chosen for the inductance computation due to a higher accuracy [Thondapu 2012]. Table 2 shows the inductance requirements and comparisons between the MIP and MIO structure (refer to Fig.…”

Section: Inductance Analysismentioning

confidence: 99%

Improved High-Frequency Planar Transformer for Line Level Control (LLC) Resonant Converters

Water

2013

IEEE Magn. Lett.

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In this letter, an improved structure of High Frequency (HF) magnetic integrated planar transformer is proposed and the prototype transformer is demonstrated. In comparison to conventional planar integrated magnetics; the improved structure has a better ability on leakage inductance adjustment. Also; instead of using expensive Printed Circuit Board (PCB) windings on the primary side, multi-strand Litz wires are used for the design. The transformer is fabricated with two common EE shape magnetic cores along with magnetic insertions placed between the primary and secondary windings (outside the main core). To analyze the proposed transformer, the numerical 3-D Finite Element Method (FEM) technique is employed to investigate the eddy current losses and the adjustment of the leakage inductance.

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Section: Inductance Analysismentioning

confidence: 99%

Improved High-Frequency Planar Transformer for Line Level Control (LLC) Resonant Converters

Water

2013

IEEE Magn. Lett.

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“…The air ducts between the packages are used as heat dissipation channels of the packages. In this paper, a prototype of air-core power reactor with five packages is taken as an example, the parameters of which are given in Table 1 [13][14][15]. According to [16,17] the total loss in a package can be simplified as times of resistive current loss; thus, the loss of the th coil can be expressed as…”

Section: Structure and Parameters Of An Air-corementioning

confidence: 99%

Thermal Analysis of Air-Core Power Reactors

Yuan

Pan

et al. 2013

ISRN Mechanical Engineering

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A fluid-thermal coupled analysis based on FEM is conducted. The inner structure of the coils is built with consideration of both the structural details and the simplicity; thus, the detailed heat conduction process is coupled with the computational fluid dynamics in the thermal computation of air-core reactors. According to the simulation results, 2D temperature distribution results are given and proved by the thermal test results of a prototype. Then the temperature results are used to calculate the heat flux to predict the detailed heat transfer process in the packages of the reactors. The study in this paper may be useful in the design optimization in air-core reactors.

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“…This approach has been addressed in the Mclyman [17], Flangan [18] and Mohan [19] handbooks and has later been modified in several publications. Dauharje and Thondapu [20], [21] modified the accuracy of the expression by considering the flux that extends into air in a secondary shorted transformer. Apart from these, more detailed winding Fig.…”

Section: Introductionmentioning

confidence: 99%

Accurate Evaluation of Leakage Inductance in High-Frequency Transformers Using an Improved Frequency-Dependent Expression

Bahmani

Thiringer

2015

IEEE Trans. Power Electron.

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Moving towards higher power density in magnetic components, which is often realized by increasing the operating frequency, leads to the need for development of more accurate design tools, for example more accurate expressions for core losses, winding losses and leakage inductance calculations. This paper presents a new analytical expression intended to accurately evaluate the leakage inductance of transformers in the high frequency range in which the behavior of the magnetic field within the windings is altered. Unlike conventional expressions, which usually overestimate the leakage inductance at higher frequencies, this expression accounts for high frequency behavior of the magnetic field and provides high accuracy when operating at high frequencies. These high accuracy and applicability makes the derived expression of interest for designers to avoid time consuming finite element simulations without compromising with accuracy. The expression is validated by 2-D FEM simulation, as well as by measurements.

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Improved Expression for Estimation of Leakage Inductance in E Core Transformer Using Energy Method

Cited by 9 publications

References 14 publications

Improved High-Frequency Planar Transformer for Line Level Control (LLC) Resonant Converters

Improved High-Frequency Planar Transformer for Line Level Control (LLC) Resonant Converters

Thermal Analysis of Air-Core Power Reactors

Accurate Evaluation of Leakage Inductance in High-Frequency Transformers Using an Improved Frequency-Dependent Expression

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