Frequency Dependent Model of Leakage Inductance for Magnetic Components

Wilson, Peter; Wilcock, Reuben

doi:10.7716/aem.v1i3.70

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…In the case of a serial connection of all sections of the secondary winding determined value of the leakage inductance (Table 2) is much higher, than it results from proposed relation (18). This is due to additional impedances of joints required between the sections, that in this case, all are in series with turns of the winding, causing an increase of equivalent winding's resistance and inductance.…”

Section: Object Of the Research And Applied Methodology Of The Laboramentioning

confidence: 82%

“…The leakage inductance mainly depends on the dimensions of the windings and the core of the transformers. Finite element method presented in [18] was used to determine the change of the leakage inductance with a frequency of transformed voltage. The results indicate no changes in the value of the leakage inductance with the primary voltage frequency up to 10 kHz.…”

Section: Object Of the Research And Applied Methodology Of The Laboramentioning

confidence: 99%

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Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Kaczmarek

Stano

2019

IET Electric Power Applications

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The increasing number of non-linear loads and renewable energy sources causes a decrease in the power quality in the power networks. Therefore, tests of current transformers should be performed in similar conditions. This requires generation by a high current testing transformer of distorted currents that rms values are from a few hundred to several thousands of amperes with a given harmonics levels. However, its frequency band of operation is limited by inductances of its windings and connected load that result from the length and parameters of the used current track and connected device under test. To ensure the constant rms value of higher harmonic of distorted secondary current with the increase of its frequency proportional increase of the rms value of this harmonic in distorted primary voltage of the high current testing transformer is required. However, the maximum permissible value of primary voltage is limited by the dielectric strength of insulation of the primary winding. The purpose of presented studies is to determine the factors that condition the frequency band of operation of a high current testing transformer and limits the range of higher harmonics while testing of the transformation accuracy of instrument current transformers for distorted currents.

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Section: Object Of the Research And Applied Methodology Of The Laboramentioning

confidence: 82%

Section: Object Of the Research And Applied Methodology Of The Laboramentioning

confidence: 99%

Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Kaczmarek

Stano

2019

IET Electric Power Applications

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“…8), the classical expression of leakage inductance for the no interleaving structure can be derived as follows: Method 2: utilizing the imaginary part of the Dowell's AC impendence expression, the leakage inductance due to the magnetic field stored within the conductor layers can be obtained [7]. The leakage magnetic energy stored in the isolation and insulation gaps is the same as the ones presented in (9)(10)(11). Therefore, the leakage inductance referred to the primary side can also be calculated by using Eq.…”

Section: The Error Analysis For Leakage Inductancementioning

confidence: 99%

“…More recently, Hurley provided a leakage inductance expression considering the frequency dependence [9]. However, the Hurley's equation has been questioned by Wilson [10] since it was specifically derived for toroidal transformers.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Effect of Winding Interleaving on Leakage Inductance and Winding Loss of High Frequency Transformers

Chen

2019

J. Electr. Eng. Technol.

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This work concerns prediction of the effect of winding interleaving used in high frequency transformers on leakage inductance and AC resistance. Although the reduction of the leakage inductance and AC resistance by applying interleaving has been well known by most designers, it is difficult to foresee the electrical performance of the transformer in the design stage. Based on the one-dimensional model for windings of magnetic components, this study presents a frequency dependent analytical method for leakage inductance and winding loss, which is suitable for no interleaving and interleaving winding configurations. Several high frequency transformer models with distinct winding arrangements are built, and the validity of the proposed method is verified by comparing the FEM simulation and measurement. Other analytical methods are also compared with this new method. Results show that this method is more reliable and accurate as compared to the other analytical methods. The interleaving provides significant advantage in reducing the leakage inductance and winding loss.

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“…Finite element simulations are commonly applied to determine the leakage inductance, based on 2D H-field calculation. However, FEM suffers from long computation times and difficult parametrization [16]. Alternatively, there exist methods based on 1D H-field-calculation, which allow for an analytical calculation of the leakage inductance.…”

Section: Leakage Inductancementioning

confidence: 99%

Accurate and computationally efficient modeling of flyback transformer parasitics and their influence on converter losses

Leuenberger

Biela

2015

2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)

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Emerging renewable energy applications, such as PV micro inverters, demand for high step-up isolated DC-DC converters with high reliability and low cost, at high efficiency. Thanks to its low part-count the flyback converter is an optimal candidate for such applications. To achieve high efficiency over a wide load range, a decent transformer design must be performed, considering also the effects of the transformer parasitics. Therefore this work analyzes the influence of the transformer parasitic capacitances and leakage inductance in such a way, that it presents a complete tool to consider the transformer parasitics in the flyback-converter design process. A loss-analysis is performed for all three operation modes of the flyback-converter and methods for modeling the parasitic elements are discussed. To model the frequency dependence of the leakage inductance a new method is proposed. The applied models are explained in-depth and verified with measurements on prototype transformers. Figure 1: a) GaN/SiC high step-up flyback-converter prototype for PV micro-inverter, b) Two-port transformer, general parasitics equivalent circuit, [1]

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Frequency Dependent Model of Leakage Inductance for Magnetic Components

Cited by 8 publications

References 25 publications

Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Analysis of Effect of Winding Interleaving on Leakage Inductance and Winding Loss of High Frequency Transformers

Accurate and computationally efficient modeling of flyback transformer parasitics and their influence on converter losses

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