Optimal Design and Tradeoff Analysis of Planar Transformer in High-Power DC–DC Converters

Ouyang, Ziwei; Thomsen, Ole C.; Andersen, Michael A. E.

doi:10.1109/tie.2010.2046005

Cited by 314 publications

(130 citation statements)

References 27 publications

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“…5 is proposed, as other circuit models found in literature [8,12,14,[26][27][28] use a magnetizing inductance approach that is unable to model the resonance mechanism between the secondary winding inductance and secondary self-capacitance, which is critical to analytically determine their impact on bandwidth. The non-ideal coupling behavior is captured by the inclusion of a leakage inductance element.…”

Section: The Equivalent Electrical Circuit Modelmentioning

confidence: 99%

“…This characteristic allows parasitics to be intelligently controlled such that they have the least effect on the performance of the transformer. Furthermore, planar nature lends to low profile and better heat dissipation qualities [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Several articles [8,19,20] state that the bulk of research is focused on the modeling and optimizing of losses and leakage inductance, with little consideration for parasitic capacitance. This practice reflects in the design of planar transformers up to recent times as they have not seriously considered the crucial balance of parasitic capacitance and leakage inductance in the design stages.…”

Section: Introductionmentioning

confidence: 99%

“…Trade-off between leakage inductance, losses and stray capacitance has been investigated to some extent in [8], and in [4] the authors define a 'figure-of-trouble' product LC as being the product of leakage inductance and parasitic capacitance, since both quantities are dependent on the dielectric thickness of the windings in an opposing manner. In both papers, the trade-off has not been thoroughly investigated within the context of bandwidth, leaving room for further research in this direction.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

Vallabhapurapu¹,

Hofsajer²

2018

PIER C

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Abstract-This paper considers an ideal planar transformer wherein only the electromagnetic parasitics (stray capacitive and leakage inductance) arising out of the transformer geometry are taken into account, assuming lossless conditions. A suitable electrically equivalent circuit model for the planar transformer is used to analyze its frequency and power transfer characteristics; this model was validated by a three dimensional electromagnetic simulation of the planar transformer structure in FEKO electromagnetic simulation software. The effect of dielectric thickness on the bandwidth of the transformer has been analyzed based on the premise that the inherent stray capacitance and leakage inductance elements would affect the power transfer characteristics of the transformer. It has been found that the dielectric thickness of a planar transformer can be optimized so as to maximize the frequency bandwidth. It is also shown that the bandwidth is found to be sensitive to the thickness of the dielectric beyond the optimum thickness threshold t opt . Convenient closed form analytic expressions for the optimum dielectric thickness and the resultant maximum bandwidth are derived and presented. It is argued that these results can be readily used to benefit the design of air-core PCB/Planar transformers.

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Section: The Equivalent Electrical Circuit Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

Vallabhapurapu¹,

Hofsajer²

2018

PIER C

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“…Based on resistance of the j-th winding section (Rac(j)) consisting of ms layers c following relationship (e.g. [19][20][21][22][23][24]):…”

Section: Windings Resistancesmentioning

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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Planar Magnetics

2013

Transformers and Inductors for Power Electronics

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Optimal Design and Tradeoff Analysis of Planar Transformer in High-Power DC–DC Converters

Cited by 314 publications

References 27 publications

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

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

Planar Magnetics

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