An Accurate Pseudoempirical Model of Winding Loss Calculation in HF Foil and Round Conductors in Switchmode Magnetics

Bahmani, M. A.; Thiringer, Torbjörn; Ortega, Hector

doi:10.1109/tpel.2013.2292593

Cited by 60 publications

(41 citation statements)

References 26 publications

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“…It should be noted that the final expression has been derived based on foil winding configuration, however, it would be applicable for round conductors by modifying ∆ of the windings portion with round wire as [5] …”

Section: Expression Derivationmentioning

confidence: 99%

“…The energy stored within the isolation distance between the windings, as well as the insulation distances between the primary and secondary layers are the same as the ones presented in (4), (5) and (6), respectively. This approach has been partially adopted in [28] with one exception, i.e., the energy stored in the isolation and insulation, which have been calculated with the classical approach, in which the first component, which is the frequencydependent component, should be calculated for each winding portion, separately.…”

Section: B Comparison With Frequency Dependent Expressionsmentioning

confidence: 99%

“…To achieve this goal, the bulky 50/60 Hz transformers have been replaced with high power density DC-DC converters consisting of high-frequency transformers with lower weights and volumes. However, being exposed to higher frequencies, one should cope with extra losses coming from eddy current losses in the magnetic core [3], [4], excess losses in the windings due to enhanced skin and proximity effects [5], as well as parasitic elements, i.e., leakage inductance [6]- [8] and winding capacitance [9], [10], causing excess switching losses in the power semiconductors which is usually dominant at higher frequencies [11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Expression Derivationmentioning

confidence: 99%

Section: B Comparison With Frequency Dependent Expressionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…These challenges are basically related to the extra losses as a result of eddy current in the magnetic core, excess losses in the windings due to enhanced skin and proximity effects [4] and parasitic elements, i.e., leakage inductance and winding capacitances, causing excess switching losses in the power semiconductors which are usually the dominant power losses at higher frequencies [5]. These extra losses together with the reduced size of the transformer lead to higher loss densities requiring a proper thermal management scheme in order to dissipate the higher power losses from a smaller component.…”

Section: Introductionmentioning

confidence: 99%

Optimization and experimental validation of medium-frequency high power transformers in solid-state transformer applications

Bahmani

Thiringer

Kharezy

2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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High power isolated DC-DC converters are likely to provide solutions for many technical challenges associated with power density, efficiency and reliability in potential applications such as offshore wind farms, inter-connection of DC grids, MVDC in data centers and in future solid state transformer applications. The high power medium frequency transformer (HPMFT) is one of the key elements of such a converter to realize the voltage adaption, isolation requirements, as well as high power density. This paper describes a design and optimization methodology taking into account the loss calculation, isolation requirements and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a 50 kW, 1 / 3 kV, 5 kHz transformer to find the highest power density while the efficiency, isolation, thermal and leakage inductance requirements are all met. The optimized transformers are then manufactured and will be presented in this paper.

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“…These problems are the subject of many publications (e.g. [6,[9][10][11][12][13][14][15][16]). Particularly noteworthy are works [6,10,11] showing the method of R. Barlik, M. Nowak, P. Grzejszczak, and M. Zdanowski contain two H-bridges, whose AC circuits are connected, either directly or through additional inductors, to the windings of the high-frequency transformer (Fig.…”

Section: Introductionmentioning

confidence: 99%

Analytical description of power losses in a transformer operating in the dual active bridge converter

Barlik

Nowak

Grzejszczak

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The paper presents an analytical approach to the determination of power losses in a high-frequency transformer operating in the dual active bridge (DAB). This transformer, having two single-phase transistor bridge inverters, couples two DC circuits that significantly differ in voltages (280 V and 51 V ±20%). Power losses in the core and windings of the planar transformer 5600 VA /100 kHz were calculated taking into account changes in the value and direction of the energy flow between the coupled DC circuits. These circuits represent storage or renewable energy sources and intermediate circuits of the converters used in distributed generation systems. Calculations were performed using the Steinmetz's and Dowell's equations. The analytical results have been verified experimentally.Key words: core and windings losses, ferrite, planar transformer, Steinmetz's equation, Dowell's model, dual active bridge. determining the power losses in the core and windings of high frequency transformers. However, the results reported in these publications are obtained in an experimental way and confirmed using a complex analytical description, which is difficult to use in practice. In a number of publications (e.g. [11,[13][14][15]17]), attention is paid to the impact of the growth of the winding resistance for the harmonic current of the transformer, but with no reference to the operation in the DAB system. This paper presents the analytical determination of the power losses in the core and windings of the high-frequency transformer which operates in a dual active bridge. For the determination of these losses, the Steinmetz and Dowell models were used [18,19]. The results of the power losses calculations include the influence of the transformer temperature different relationships between the DC voltages and varying shift modulation ratios of the DAB converter. Analytical description of power losses in a transformerSection 2 presents an overview of a DAB system that includes the transformer being the main subject of this study. Section 3 provides a description of the construction of the transformer and its basic parameters. Sections 4 and 5 are devoted to the discussion of the analytical models used to determine the power loss, as well as the presentation of the results of calculations of the losses in the core and windings of the transformer under consideration. Section 6 provides the results of calculations of the total power loss and transformer energy efficiency with respect to the DAB system. In Section 7, the results obtained analytically and the results of experimental measurements are compared. Section 8 is a summary of the study, containing a brief assessment of the results and conclusions regarding the suitability of the proposed analytical description. The dual active bridge (DAB)Among different versions of dual active bridges, the most commonly presented in the literature are single-phase systems. They

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An Accurate Pseudoempirical Model of Winding Loss Calculation in HF Foil and Round Conductors in Switchmode Magnetics

Cited by 60 publications

References 26 publications

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

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

Optimization and experimental validation of medium-frequency high power transformers in solid-state transformer applications

Analytical description of power losses in a transformer operating in the dual active bridge converter

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